Android开发之《Android应用开发揭秘》UI事件汇总

/*

* Android开发之《Android应用开发揭秘》UI事件汇总

* 北京Android俱乐部群：167839253

* Created on: 2011-12-01

* Author: blueeagle

* Email: liujiaxiang@gmail.com

*/

思想跑毛是很可怕的，最近去尝试了下创业，结果碰了一鼻子灰，公司乱七八糟的项目搞的焦头烂额。各种没有心情。还好，现在沉淀下来，继续android开发的征程。

以下是Android应用开发揭秘这本书第四章的关于UI的事件处理的总结。基本上都是可以复用的代码。存着日后方便。

1.EditView控件的setOnKeyListener方法。点击上下左右键或者中间键的时候可以出发该方法。代码如下。

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1. myEditView.setOnKeyListener(newEditText.OnKeyListener(){
3. @Override
4. publicbooleanonKey(Viewv,intkeyCode,KeyEventevent){
5. myTextView.setText("文本框中内容是："+myEditView.getText().toString());
6. returnfalse;//TODOAuto-generatedmethodstub
7. }
8. });

myEditView.setOnKeyListener(new EditText.OnKeyListener(){ @Override public boolean onKey(View v, int keyCode, KeyEvent event) { myTextView.setText("文本框中内容是："+myEditView.getText().toString()); return false;// TODO Auto-generated method stub } });

2.RadioButton控件和RadioGroup控件的组合使用，代码如下：

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1. myRadioGroup.setOnCheckedChangeListener(newRadioGroup.OnCheckedChangeListener(){
3. @Override
4. publicvoidonCheckedChanged(RadioGroupgroup,intcheckedId){
5. //TODOAuto-generatedmethodstub
6. if(checkedId==myRadioButton3.getId())
7. {
8. DisplayToast("正确答案："+myRadioButton3.getText()+"恭喜你回答正确");
9. }
10. else
11. {
12. DisplayToast("回答错误");
13. }
14. }
15. );

myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { // TODO Auto-generated method stub if(checkedId == myRadioButton3.getId()) { DisplayToast("正确答案："+myRadioButton3.getText()+"恭喜你回答正确"); } else { DisplayToast("回答错误"); } } });

3.CheckBox控件的使用，代码如下：

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1. myCheckBox1.setOnCheckedChangeListener(newCheckBox.OnCheckedChangeListener(){
2. @Override
3. publicvoidonCheckedChanged(CompoundButtonbuttonView,
4. booleanisChecked){
5. //TODOAuto-generatedmethodstub
6. if(myCheckBox1.isChecked()){
7. DisplayToast("你选择了："+myCheckBox1.getText());
8. }
9. }
10. });

myCheckBox1.setOnCheckedChangeListener(new CheckBox.OnCheckedChangeListener(){ @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { // TODO Auto-generated method stub if(myCheckBox1.isChecked()){ DisplayToast("你选择了："+myCheckBox1.getText()); } } });

4.Button控件的使用，代码如下：

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1. myButton1.setOnClickListener(newButton.OnClickListener(){
2. @Override
3. publicvoidonClick(Viewv){
4. }
5. });

myButton1.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { } });

4.Spinner控件的使用，代码如下：

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1. //Spinner控件需要跟ArrayAdapter绑定使用。
2. privatestaticfinalString[]m_Countries={"A型","B型","O型","AB型","未知类型"};
3. privateSpinnermySpinner;
4. privateArrayAdapter<String>myAdapter;
5. mySpinner=(Spinner)findViewById(R.id.mySpinner1);
6. myAdapter=newArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries);
7. //设置下拉列表风格
8. myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
9. //将adapter添加到mySpinner中
10. mySpinner.setAdapter(myAdapter);
11. //添加事件监听
12. mySpinner.setOnItemSelectedListener(newSpinner.OnItemSelectedListener(){
13. @Override
14. publicvoidonItemSelected(AdapterView<?>arg0,Viewarg1,
15. intarg2,longarg3){
16. //TODOAuto-generatedmethodstub
17. myTextView.setText("你的血型是"+m_Countries[arg2]);
18. arg0.setVisibility(View.VISIBLE);
19. }
20. @Override
21. publicvoidonNothingSelected(AdapterView<?>arg0){
22. //TODOAuto-generatedmethodstub
23. DisplayToast("你什么也没选！");
24. }
25. });

//Spinner控件需要跟ArrayAdapter绑定使用。 private static final String[] m_Countries = {"A型","B型","O型","AB型","未知类型"}; private Spinner mySpinner; private ArrayAdapter<String> myAdapter; mySpinner = (Spinner)findViewById(R.id.mySpinner1); myAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m_Countries); //设置下拉列表风格 myAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //将adapter添加到mySpinner中 mySpinner.setAdapter(myAdapter); //添加事件监听 mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){ @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub myTextView.setText("你的血型是"+ m_Countries[arg2]); arg0.setVisibility(View.VISIBLE); } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub DisplayToast("你什么也没选！"); } });

5.AutoCompleteTextView的使用，代码如下：

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1. privatestaticfinalString[]autoString={"abcd1","abcd212","32123","32open","32add","android","windows","iphone","linux","mydirve","msnbmw","wocaonimalegebi"};
2. privateArrayAdapter<String>myAdapter1;
3. privateAutoCompleteTextViewmyAutoCompleteTextView;
4. myAdapter1=newArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,autoString);
5. myAutoCompleteTextView=(AutoCompleteTextView)findViewById(R.id.myAutoCompleteTextView);
6. myAutoCompleteTextView.setAdapter(myAdapter1);
7. 6.DatePicker、TimePicker以及Button的使用，代码如下：
8. myCalendar1=Calendar.getInstance();
9. myTextView=(TextView)findViewById(R.id.myTextView);
10. myDatePicker=(DatePicker)findViewById(R.id.datePicker1);
11. myTimePicker=(TimePicker)findViewById(R.id.timePicker1);
12. myButton1=(Button)findViewById(R.id.button1);
13. myButton2=(Button)findViewById(R.id.button2);
15. //将日历初始化为当前系统时间，并设置其事件监听
16. myDatePicker.init(myCalendar1.get(Calendar.YEAR),myCalendar1.get(Calendar.MONTH),myCalendar1.get(Calendar.DAY_OF_MONTH),newDatePicker.OnDateChangedListener(){
18. @Override
19. publicvoidonDateChanged(DatePickerview,intyear,intmonthOfYear,
20. intdayOfMonth){
21. //当日期更改时，在这里处理。
22. //myCalendar1.set(year,month,day);
23. }
24. });
25. //获取TimePicker对象设置为24小时显示。
26. myTimePicker.setIs24HourView(true);
27. //监听时间改变
28. myTimePicker.setOnTimeChangedListener(newTimePicker.OnTimeChangedListener(){
30. @Override
31. publicvoidonTimeChanged(TimePickerview,inthourOfDay,intminute){
32. //TODOAuto-generatedmethodstub
33. //当时间改变时，在这里处理。
34. //myCalendar1.set(year,month,day,hourOfDay,minute);
35. }
36. });
37. //-----------按钮事件---------//
38. myButton1.setOnClickListener(newButton.OnClickListener(){
39. @Override
40. publicvoidonClick(Viewv){
41. //下面的NEW是新建了一个调整日历的对话框
42. newDatePickerDialog(AndroidUnleashed001Activity.this,newDatePickerDialog.OnDateSetListener(){
43. @Override
44. publicvoidonDateSet(DatePickerview,intyear,
45. intmonthOfYear,intdayOfMonth){
46. //TODOAuto-generatedmethodstub
47. //设置日历
48. }
49. },myCalendar1.get(Calendar.YEAR),myCalendar1.get(Calendar.MONTH),myCalendar1.get(Calendar.DAY_OF_MONTH)).show();
50. }
51. });
52. myButton2.setOnClickListener(newButton.OnClickListener(){
53. @Override
54. publicvoidonClick(Viewv){
55. //下面的NEW是新建了一个调整时间的对话框
56. newTimePickerDialog(AndroidUnleashed001Activity.this,newTimePickerDialog.OnTimeSetListener(){
58. @Override
59. publicvoidonTimeSet(TimePickerview,inthourOfDay,intminute){
60. //TODOAuto-generatedmethodstub
61. }
62. },myCalendar1.get(Calendar.HOUR_OF_DAY),myCalendar1.get(Calendar.MINUTE),true).show();
63. }
64. });
65. }

private static final String[] autoString = {"abcd1","abcd212","32123","32open","32add","android","windows","iphone","linux","mydirve","msnbmw","wocaonimalegebi"}; private ArrayAdapter<String> myAdapter1; private AutoCompleteTextView myAutoCompleteTextView; myAdapter1 = new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,autoString); myAutoCompleteTextView = (AutoCompleteTextView)findViewById(R.id.myAutoCompleteTextView); myAutoCompleteTextView.setAdapter(myAdapter1); 6.DatePicker、TimePicker以及Button的使用，代码如下： myCalendar1 = Calendar.getInstance(); myTextView = (TextView)findViewById(R.id.myTextView); myDatePicker = (DatePicker)findViewById(R.id.datePicker1); myTimePicker = (TimePicker)findViewById(R.id.timePicker1); myButton1 = (Button)findViewById(R.id.button1); myButton2 = (Button)findViewById(R.id.button2); //将日历初始化为当前系统时间，并设置其事件监听 myDatePicker.init(myCalendar1.get(Calendar.YEAR), myCalendar1.get(Calendar.MONTH), myCalendar1.get(Calendar.DAY_OF_MONTH), new DatePicker.OnDateChangedListener() { @Override public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) { // 当日期更改时，在这里处理。 // myCalendar1.set(year, month, day); } }); //获取TimePicker对象设置为24小时显示。 myTimePicker.setIs24HourView(true); //监听时间改变 myTimePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() { @Override public void onTimeChanged(TimePicker view, int hourOfDay, int minute) { // TODO Auto-generated method stub // 当时间改变时，在这里处理。 //myCalendar1.set(year, month, day, hourOfDay, minute); } }); //-----------按钮事件---------// myButton1.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // 下面的NEW 是新建了一个调整日历的对话框 new DatePickerDialog(AndroidUnleashed001Activity.this,new DatePickerDialog.OnDateSetListener(){ @Override public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { // TODO Auto-generated method stub //设置日历 } },myCalendar1.get(Calendar.YEAR),myCalendar1.get(Calendar.MONTH), myCalendar1.get(Calendar.DAY_OF_MONTH)).show(); } }); myButton2.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { //下面的NEW 是新建了一个调整时间的对话框 new TimePickerDialog(AndroidUnleashed001Activity.this, new TimePickerDialog.OnTimeSetListener() { @Override public void onTimeSet(TimePicker view, int hourOfDay, int minute) { // TODO Auto-generated method stub } }, myCalendar1.get(Calendar.HOUR_OF_DAY), myCalendar1.get(Calendar.MINUTE),true).show(); } }); }

7.Menu的使用，代码如下：

1.XML方式实现

XML代码可以写成：

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1. <menuxmlns:android="http://schemas.android.com/apk/res/android">
2. <itemandroid:id="@+id/style_submenu"android:title="笔迹样式">
3. <menu>
4. <groupandroid:id="@+id/style_group"android:checkableBehavior="single">
5. <itemandroid:id="@+id/style"android:orderInCategory="1"android:title="铅笔"/>
6. <itemandroid:id="@+id/style"android:orderInCategory="2"android:title="钢笔"/>
7. <itemandroid:id="@+id/style"android:orderInCategory="3"android:title="毛笔"/>
8. </group>
9. </menu>
10. </item>
11. <itemandroid:id="@+id/color_submenu"android:title="笔迹颜色">
12. <menu>
13. <groupandroid:id="@+id/color_group"android:checkableBehavior="single">
14. <itemandroid:id="@+id/color"android:orderInCategory="0"android:title="蓝色"/>
15. <itemandroid:id="@+id/color"android:orderInCategory="1"android:title="绿色"/>
16. <itemandroid:id="@+id/color"android:orderInCategory="2"android:title="青色"/>
17. <itemandroid:id="@+id/color"android:orderInCategory="3"android:title="红色"/>
18. </group>
19. </menu>
20. </item>
21. <itemandroid:id="@+id/width_submenu"android:title="笔迹粗细">
22. <menu>
23. <groupandroid:id="@+id/width_group"android:checkableBehavior="single">
24. <itemandroid:id="@+id/width"android:orderInCategory="1"android:title="较细"/>
25. <itemandroid:id="@+id/width"android:orderInCategory="2"android:title="细"/>
26. <itemandroid:id="@+id/width"android:orderInCategory="3"android:title="中等"/>
27. <itemandroid:id="@+id/width"android:orderInCategory="4"android:title="粗"/>
28. <itemandroid:id="@+id/width"android:orderInCategory="5"android:title="较粗"/>
29. </group>
30. </menu>
31. </item>
32. <itemandroid:id="@+id/write"android:title="书写"/>
33. <itemandroid:id="@+id/erase"android:title="清除"/>
34. <itemandroid:id="@+id/clear"android:title="清屏"/>
35. </menu>

<menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/style_submenu" android:title="笔迹样式"> <menu> <group android:id="@+id/style_group" android:checkableBehavior="single"> <item android:id="@+id/style" android:orderInCategory="1" android:title="铅笔" /> <item android:id="@+id/style" android:orderInCategory="2" android:title="钢笔" /> <item android:id="@+id/style" android:orderInCategory="3" android:title="毛笔" /> </group> </menu> </item> <item android:id="@+id/color_submenu" android:title="笔迹颜色"> <menu> <group android:id="@+id/color_group" android:checkableBehavior="single"> <item android:id="@+id/color" android:orderInCategory="0" android:title="蓝色" /> <item android:id="@+id/color" android:orderInCategory="1" android:title="绿色" /> <item android:id="@+id/color" android:orderInCategory="2" android:title="青色" /> <item android:id="@+id/color" android:orderInCategory="3" android:title="红色" /> </group> </menu> </item> <item android:id="@+id/width_submenu" android:title="笔迹粗细"> <menu> <group android:id="@+id/width_group" android:checkableBehavior="single"> <item android:id="@+id/width" android:orderInCategory="1" android:title="较细" /> <item android:id="@+id/width" android:orderInCategory="2" android:title="细" /> <item android:id="@+id/width" android:orderInCategory="3" android:title="中等" /> <item android:id="@+id/width" android:orderInCategory="4" android:title="粗" /> <item android:id="@+id/width" android:orderInCategory="5" android:title="较粗" /> </group> </menu> </item> <item android:id="@+id/write" android:title="书写" /> <item android:id="@+id/erase" android:title="清除" /> <item android:id="@+id/clear" android:title="清屏" /> </menu>

JAVA代码：

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1. @Override
2. publicbooleanonCreateOptionsMenu(Menumenu){
3. MenuInflaterinflater=getMenuInflater();
4. inflater.inflate(R.menu.menu,menu);
5. returntrue;
6. }
7. @Override
8. publicbooleanonOptionsItemSelected(MenuItemitem){
9. intitem_id=item.getItemId();
10. switch(item_id)
11. {
12. caseR.id.about1:
13. Intentintent=newIntent();
15. intent.setClass(AndroidUnleashed001Activity.this,Activity02.class);
16. startActivity(intent);
17. AndroidUnleashed001Activity.this.finish();
18. break;
19. caseR.id.about2:
20. AndroidUnleashed001Activity.this.finish();
21. break;
22. }
23. returntrue;
24. }
25. .Menu.add方法实现
26. publicbooleanonCreateOptionsMenu(Menumenu){
27. //MenuInflaterinflater=getMenuInflater();
28. //inflater.inflate(R.menu.menu,menu);
29. menu.add(0,0,0,R.string.app_name);
30. menu.add(0,1,1,R.string.hello);
31. returntrue;
32. }

@Override public boolean onCreateOptionsMenu(Menu menu){ MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item){ int item_id = item.getItemId(); switch (item_id) { case R.id.about1: Intent intent = new Intent(); intent.setClass(AndroidUnleashed001Activity.this, Activity02.class); startActivity(intent); AndroidUnleashed001Activity.this.finish(); break; case R.id.about2: AndroidUnleashed001Activity.this.finish(); break; } return true; } 1.Menu.add方法实现 public boolean onCreateOptionsMenu(Menu menu){ //MenuInflater inflater = getMenuInflater(); //inflater.inflate(R.menu.menu, menu); menu.add(0,0,0,R.string.app_name); menu.add(0,1,1,R.string.hello); return true; }

8.弹出对话框的使用，代码如下：

这个功能为弹出对话框，点击确定后弹出登录对话框，然后点击登录后弹出多线程对话框。

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1. Dialogdialog=newAlertDialog.Builder(AndroidUnleashed001Activity.this).setTitle("登录提示").setMessage("这里需要登录").setPositiveButton("确定",newDialogInterface.OnClickListener(){
2. @Override
3. publicvoidonClick(DialogInterfacedialog,intwhich){
4. //点击确定转向登陆框
5. LayoutInflaterfactory=LayoutInflater.from(AndroidUnleashed001Activity.this);
6. //得到自定义对话框
7. finalViewDialogView=factory.inflate(R.layout.pop,null);
8. //创建对话框
9. AlertDialogdlg=newAlertDialog.Builder(AndroidUnleashed001Activity.this).setTitle("登录框").setView(DialogView).setPositiveButton("确定",newDialogInterface.OnClickListener(){
10. privateProgressDialogmyProgressDialog;
11. @Override
12. publicvoidonClick(DialogInterfacedialog,intwhich){
13. //当输入完成后，点击确定开始登录。
14. myProgressDialog=ProgressDialog.show(AndroidUnleashed001Activity.this,"请等待","正在为您登陆",true);
15. newThread(){
16. publicvoidrun(){
17. try{
18. sleep(3000);
19. }
20. catch(Exceptione){
21. e.printStackTrace();
22. }
23. finally{
24. myProgressDialog.dismiss();
25. }
26. }
27. }.start();
28. }
29. }).setNegativeButton("取消",newDialogInterface.OnClickListener(){
31. @Override
32. publicvoidonClick(DialogInterfacedialog,intwhich){
33. //TODOAuto-generatedmethodstub
34. AndroidUnleashed001Activity.this.finish();
35. }
36. }).create();
37. dlg.show();
38. }
39. }).setNegativeButton("退出",newDialogInterface.OnClickListener(){
41. @Override
42. publicvoidonClick(DialogInterfacedialog,intwhich){
43. //TODOAuto-generatedmethodstub
44. AndroidUnleashed001Activity.this.finish();
45. }
46. }).create();
47. dialog.show();

Dialog dialog = new AlertDialog.Builder(AndroidUnleashed001Activity.this).setTitle("登录提示").setMessage("这里需要登录").setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // 点击确定转向登陆框 LayoutInflater factory = LayoutInflater.from(AndroidUnleashed001Activity.this); //得到自定义对话框 final View DialogView = factory.inflate(R.layout.pop, null); //创建对话框 AlertDialog dlg = new AlertDialog.Builder(AndroidUnleashed001Activity.this).setTitle("登录框").setView(DialogView).setPositiveButton("确定", new DialogInterface.OnClickListener() { private ProgressDialog myProgressDialog; @Override public void onClick(DialogInterface dialog, int which) { // 当输入完成后，点击确定开始登录。 myProgressDialog = ProgressDialog.show(AndroidUnleashed001Activity.this, "请等待", "正在为您登陆",true); new Thread(){ public void run(){ try{ sleep(3000); } catch(Exception e){ e.printStackTrace(); } finally{ myProgressDialog.dismiss(); } } }.start(); } }).setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub AndroidUnleashed001Activity.this.finish(); } }).create(); dlg.show(); } }).setNegativeButton("退出", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub AndroidUnleashed001Activity.this.finish(); } }).create(); dialog.show();

9.ImageView的使用，代码如下：

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1. myImageButton1.setImageDrawable(getResources().getDrawable(R.drawable.logo2));
3. myImageButton1.setOnClickListener(newButton.OnClickListener(){
5. @Override
6. publicvoidonClick(Viewv){
7. //TODOAuto-generatedmethodstub
8. Dialogmydialog=newAlertDialog.Builder(AndroidUnleashed003Activity.this).setTitle("提示")
9. .setMessage("我是ImageButton1").setPositiveButton("确定",newDialogInterface.OnClickListener(){
11. @Override
12. publicvoidonClick(DialogInterfacedialog,intwhich){
13. //TODOAuto-generatedmethodstub
15. }
16. }).create();
17. mydialog.show();
18. }
19. });

myImageButton1.setImageDrawable(getResources().getDrawable(R.drawable.logo2)); myImageButton1.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub Dialog mydialog = new AlertDialog.Builder(AndroidUnleashed003Activity.this).setTitle("提示") .setMessage("我是ImageButton1").setPositiveButton("确定",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }).create(); mydialog.show(); } });

注意：如果要去掉ImageButton后面的背景色，使得ImageButton看起来更漂亮一些而不是有个边，则需要做：在XML文件中的属性里添加：“android:background="#00000000"”

10.Gallery的使用，拖动效果很炫，代码如下：

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1. GallerymyGallery=(Gallery)findViewById(R.id.myGallery);
2. //添加ImageAdapter给Gallery对象
3. myGallery.setAdapter(newImageAdapter(this));
4. myGallery.setBackgroundResource(R.drawable.background);
5. myGallery.setOnItemClickListener(newOnItemClickListener(){
6. @Override
7. publicvoidonItemClick(AdapterView<?>arg0,Viewarg1,intarg2,
8. longarg3){
9. //TODOAuto-generatedmethodstub
10. Toast.makeText(AndroidUnleashed003Activity.this,"你选择了"+(arg2+1)+"号图片",Toast.LENGTH_SHORT).show();
11. }
12. });
13. }
14. //另外，需要存放图片，存放图片的容器，需要使用一个类实现，这个类是ImageAdapter，继承于BaseAdapter。
15. publicclassImageAdapterextendsBaseAdapter{
16. privateContextmyContext;
17. privateInteger[]mImageIds={
18. R.drawable.ic_launcher,
19. R.drawable.icon,
20. R.drawable.logo,
21. R.drawable.logo2,
22. R.drawable.logo,
23. R.drawable.ic_launcher,
24. R.drawable.icon,
25. R.drawable.logo,
26. };
27. publicImageAdapter(Contextc){
28. myContext=c;
29. }
30. @Override
31. //获取图片的个数
32. publicintgetCount(){
33. //TODOAuto-generatedmethodstub
34. returnmImageIds.length;
35. }
36. @Override
37. //获取图片在库中的位置
38. publicObjectgetItem(intarg0){
39. //TODOAuto-generatedmethodstub
40. returnarg0;
41. }
43. @Override
44. //获取图片在库中的位置
45. publiclonggetItemId(intarg0){
46. //TODOAuto-generatedmethodstub
47. returnarg0;
48. }
49. @Override
50. publicViewgetView(intposition,Viewarg1,ViewGrouparg2){
51. //TODOAuto-generatedmethodstub
52. //returnnull;
53. ImageViewmyImageView=newImageView(myContext);
54. //给ImageView设置资源
55. myImageView.setImageResource(mImageIds[position]);
56. //设置布局图片以120*120显示
57. //myImageView.setLayoutParams(newGallery.LayoutParams(120,120));
58. //设置显示比例类型
59. //myImageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
60. returnmyImageView;
61. }
62. }

Gallery myGallery = (Gallery)findViewById(R.id.myGallery); //添加ImageAdapter给Gallery对象 myGallery.setAdapter(new ImageAdapter(this)); myGallery.setBackgroundResource(R.drawable.background); myGallery.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub Toast.makeText(AndroidUnleashed003Activity.this, "你选择了"+(arg2+1)+" 号图片 ", Toast.LENGTH_SHORT).show(); } }); } //另外，需要存放图片，存放图片的容器，需要使用一个类实现，这个类是ImageAdapter，继承于BaseAdapter。 public class ImageAdapter extends BaseAdapter{ private Context myContext; private Integer[] mImageIds = { R.drawable.ic_launcher, R.drawable.icon, R.drawable.logo, R.drawable.logo2, R.drawable.logo, R.drawable.ic_launcher, R.drawable.icon, R.drawable.logo, }; public ImageAdapter(Context c){ myContext = c; } @Override //获取图片的个数 public int getCount() { // TODO Auto-generated method stub return mImageIds.length; } @Override //获取图片在库中的位置 public Object getItem(int arg0) { // TODO Auto-generated method stub return arg0; } @Override //获取图片在库中的位置 public long getItemId(int arg0) { // TODO Auto-generated method stub return arg0; } @Override public View getView(int position, View arg1, ViewGroup arg2) { // TODO Auto-generated method stub //return null; ImageView myImageView = new ImageView(myContext); //给ImageView设置资源 myImageView.setImageResource(mImageIds[position]); //设置布局图片以120*120显示 //myImageView.setLayoutParams(new Gallery.LayoutParams(120,120)); //设置显示比例类型 //myImageView.setScaleType(ImageView.ScaleType.FIT_CENTER); return myImageView; } }

11.ImageSwitcher的使用，代码如下：

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1. //首先需要实现接口：
2. extendsActivityimplementsOnClickListener,ViewFactory
3. //具体操作：
4. LinearLayoutmyMainView=newLinearLayout(this);
5. //创建ImageSwitcher对象
6. mySwitcher=newImageSwitcher(this);
7. myMainView.addView(mySwitcher);
8. mySwitcher.setId(BUTTON_SWITCHER_ID);
9. mySwitcher.setFactory(this);
10. mySwitcher.setImageResource(mImageIds[index]);
12. setContentView(myMainView);
14. Buttonnext=newButton(this);
15. next.setId(BUTTON_DOWN_ID);
16. next.setText("下一张");
17. next.setOnClickListener(this);
18. //LinearLayout.LayoutParamsparam=newLinearLayout.LayoutParams(200,200);
19. myMainView.addView(next);
21. Buttonpre=newButton(this);
22. pre.setId(BUTTON_UP_ID);
23. pre.setText("上一张");
24. pre.setOnClickListener(this);
25. myMainView.addView(pre);
27. }
29. privateImageSwitchermySwitcher;
30. privatestaticintindex=0;
31. //上一页，下一页的按钮索引和Switcher的对象ID
32. privatestaticfinalintBUTTON_DOWN_ID=0x123456;
33. privatestaticfinalintBUTTON_UP_ID=0x123457;
34. privatestaticfinalintBUTTON_SWITCHER_ID=0x123458;
36. //实现OnClickListener接口的函数
37. @Override
38. publicvoidonClick(Viewv){
39. //TODOAuto-generatedmethodstub
40. switch(v.getId()){
41. caseBUTTON_DOWN_ID:
42. index++;
43. if(index>=mImageIds.length){
44. index=0;
45. }
46. mySwitcher.setImageResource(mImageIds[index]);
47. break;
48. caseBUTTON_UP_ID:
49. index--;
50. if(index<0){
51. index=mImageIds.length-1;
52. }
53. mySwitcher.setImageResource(mImageIds[index]);
54. break;
55. default:
56. break;
57. }
58. }
60. //实现View.Factory接口的函数
61. @Override
62. publicViewmakeView(){
63. //TODOAuto-generatedmethodstub
64. returnnewImageView(this);
65. }

//首先需要实现接口： extends Activity implements OnClickListener,ViewFactory //具体操作： LinearLayout myMainView = new LinearLayout(this); //创建ImageSwitcher对象 mySwitcher = new ImageSwitcher(this); myMainView.addView(mySwitcher); mySwitcher.setId(BUTTON_SWITCHER_ID); mySwitcher.setFactory(this); mySwitcher.setImageResource(mImageIds[index]); setContentView(myMainView); Button next = new Button(this); next.setId(BUTTON_DOWN_ID); next.setText("下一张"); next.setOnClickListener(this); //LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(200,200); myMainView.addView(next); Button pre = new Button(this); pre.setId(BUTTON_UP_ID); pre.setText("上一张"); pre.setOnClickListener(this); myMainView.addView(pre); } private ImageSwitcher mySwitcher; private static int index = 0; //上一页，下一页的按钮索引和Switcher的对象ID private static final int BUTTON_DOWN_ID = 0x123456; private static final int BUTTON_UP_ID = 0x123457; private static final int BUTTON_SWITCHER_ID = 0x123458; //实现OnClickListener接口的函数 @Override public void onClick(View v) { // TODO Auto-generated method stub switch(v.getId()){ case BUTTON_DOWN_ID: index++; if(index>= mImageIds.length){ index = 0; } mySwitcher.setImageResource(mImageIds[index]); break; case BUTTON_UP_ID: index--; if(index<0){ index = mImageIds.length-1; } mySwitcher.setImageResource(mImageIds[index]); break; default: break; } } //实现View.Factory接口的函数 @Override public View makeView() { // TODO Auto-generated method stub return new ImageView(this); }

12.GridView的使用，代码如下：

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1. //这个和Gallery的使用相似，也需要存图片在BaseAdapter中。
2. GridViewmyGridView=(GridView)findViewById(R.id.gridView1);
3. myGridView.setAdapter(newImageAdapter(this));
5. myGridView.setBackgroundResource(R.drawable.background);
6. myGridView.setOnItemClickListener(newOnItemClickListener(){
8. @Override
9. publicvoidonItemClick(AdapterView<?>arg0,Viewarg1,intarg2,
10. longarg3){
11. //TODOAuto-generatedmethodstub
12. Toast.makeText(AndroidUnleashed003Activity.this,"你选择了"+(arg2+1)+"号图片",Toast.LENGTH_SHORT).show();
13. }
15. });
16. }

//这个和Gallery的使用相似，也需要存图片在BaseAdapter中。 GridView myGridView = (GridView)findViewById(R.id.gridView1); myGridView.setAdapter(new ImageAdapter(this)); myGridView.setBackgroundResource(R.drawable.background); myGridView.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub Toast.makeText(AndroidUnleashed003Activity.this, "你选择了"+(arg2+1)+" 号图片 ", Toast.LENGTH_SHORT).show(); } }); }

12.ScrollView的使用，代码如下：

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1. //要垂直滚动，使用ScrollView要水平滚动使用HorizontalScrollView。
2. myLayout=(LinearLayout)findViewById(R.id.myLayout);
3. myScllorView=(ScrollView)findViewById(R.id.myScrollView);
4. ButtonmyButton=(Button)findViewById(R.id.myButton);
6. myButton.setOnClickListener(newButton.OnClickListener(){
7. privateintmIndex=-1;
8. @Override
9. publicvoidonClick(Viewv){
10. //TODOAuto-generatedmethodstub
11. TextViewmyTextView=newTextView(ScrollerViewActivity.this);
12. myTextView.setText("TextView"+mIndex);
13. LinearLayout.LayoutParamsp=newLinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT);
14. //增加一个TextView到现行布局中
15. myLayout.addView(myTextView,p);
17. ButtonmyButtonView=newButton(ScrollerViewActivity.this);
18. myButtonView.setText("Button"+mIndex++);
19. //增加一个Button到线性布局中
20. myLayout.addView(myButtonView,p);
21. //改变默认焦点切换
22. //myButtonView.setOnKeyListener(newButtonKeyListener);
23. //投递一个消息进行滚动
24. //myHandler.post(myScolltoBottom);
25. }
27. });
28. }

//要垂直滚动，使用ScrollView要水平滚动使用HorizontalScrollView。 myLayout = (LinearLayout)findViewById(R.id.myLayout); myScllorView = (ScrollView)findViewById(R.id.myScrollView); Button myButton = (Button)findViewById(R.id.myButton); myButton.setOnClickListener(new Button.OnClickListener(){ private int mIndex = -1; @Override public void onClick(View v) { // TODO Auto-generated method stub TextView myTextView = new TextView(ScrollerViewActivity.this); myTextView.setText("Text View"+mIndex); LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); //增加一个TextView到现行布局中 myLayout.addView(myTextView,p); Button myButtonView = new Button(ScrollerViewActivity.this); myButtonView.setText("Button "+mIndex++); //增加一个Button到线性布局中 myLayout.addView(myButtonView,p); //改变默认焦点切换 //myButtonView.setOnKeyListener(newButtonKeyListener); //投递一个消息进行滚动 //myHandler.post(myScolltoBottom); } }); }

13.ProgressBar的使用，代码如下：

ProgressBarStyleHorizontal（长形进度条）

ProgressBarStyleLarge（圆形进度条）

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1. publicclassProgressBarAextendsActivity{
2. protectedstaticfinalintGUI_STOP_NOTIFIER=0x108;
3. protectedstaticfinalintGUI_THREADING_NOTIFIER=0x109;
4. privateProgressBarmyProgress1;
5. privateProgressBarmyProgress2;
6. privateButtonmyButton;
7. privateintintCounter;
8. /**Calledwhentheactivityisfirstcreated.*/
9. @Override
10. publicvoidonCreate(BundlesavedInstanceState){
11. super.onCreate(savedInstanceState);
12. //设置窗口模式，因为需要显示进度条在标题栏
13. requestWindowFeature(Window.FEATURE_PROGRESS);
14. setProgressBarVisibility(true);
15. setContentView(R.layout.main);
16. //取得ProgressBar
17. myProgress1=(ProgressBar)findViewById(R.id.myProgressBar01);
18. myProgress2=(ProgressBar)findViewById(R.id.myProgressBar02);
19. myButton=(Button)findViewById(R.id.myButton);
21. myProgress1.setIndeterminate(false);
22. myProgress2.setIndeterminate(false);
24. myButton.setOnClickListener(newButton.OnClickListener(){
26. @Override
27. publicvoidonClick(Viewv){
28. //TODOAuto-generatedmethodstub
29. myProgress1.setVisibility(View.VISIBLE);
30. myProgress2.setVisibility(View.VISIBLE);
32. myProgress1.setMax(100);
33. myProgress1.setProgress(0);
34. myProgress2.setProgress(0);
36. //通过线程来改变Progress的值
38. newThread(newRunnable(){
40. @Override
41. publicvoidrun(){
42. //TODOAuto-generatedmethodstub
43. for(inti=0;i<10;i++){
44. try{
45. intCounter=(i+1)*20;
46. Thread.sleep(1000);
47. if(i==4){
48. Messagem=newMessage();
49. m.what=ProgressBarA.GUI_STOP_NOTIFIER;
50. ProgressBarA.this.myMessageHandler.sendMessage(m);
51. break;
52. }
53. else{
54. Messagem=newMessage();
55. m.what=ProgressBarA.GUI_THREADING_NOTIFIER;
56. ProgressBarA.this.myMessageHandler.sendMessage(m);
57. }
58. }
59. catch(Exceptione){
60. e.printStackTrace();
61. }
62. }
63. }
65. }).start();
66. }
68. });
69. }
70. HandlermyMessageHandler=newHandler(){
71. publicvoidhandleMessage(Messagemsg){
72. switch(msg.what){
73. caseProgressBarA.GUI_STOP_NOTIFIER:
74. //myProgress1.setVisibility(View.GONE);
75. //myProgress2.setVisibility(View.GONE);
76. //Thread.currentThread().interrupt();
77. break;
78. caseProgressBarA.GUI_THREADING_NOTIFIER:
79. if(!Thread.currentThread().isInterrupted()){
80. myProgress1.setProgress(intCounter);
81. myProgress1.setProgress(intCounter);
82. setProgress(intCounter*100);//设置标题栏中前景的一个进度条进度值
83. //setSecondaryProgress(intCounter*100);//设置标题栏中后面的一个进度条进度值
84. //Thread.currentThread().interrupt();
85. }
86. break;
87. }
88. super.handleMessage(msg);
89. }
90. };
91. }

public class ProgressBarA extends Activity { protected static final int GUI_STOP_NOTIFIER = 0x108; protected static final int GUI_THREADING_NOTIFIER = 0x109; private ProgressBar myProgress1; private ProgressBar myProgress2; private Button myButton; private int intCounter; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //设置窗口模式，因为需要显示进度条在标题栏 requestWindowFeature(Window.FEATURE_PROGRESS); setProgressBarVisibility(true); setContentView(R.layout.main); //取得ProgressBar myProgress1 = (ProgressBar)findViewById(R.id.myProgressBar01); myProgress2 = (ProgressBar)findViewById(R.id.myProgressBar02); myButton = (Button)findViewById(R.id.myButton); myProgress1.setIndeterminate(false); myProgress2.setIndeterminate(false); myButton.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub myProgress1.setVisibility(View.VISIBLE); myProgress2.setVisibility(View.VISIBLE); myProgress1.setMax(100); myProgress1.setProgress(0); myProgress2.setProgress(0); //通过线程来改变Progress的值 new Thread(new Runnable(){ @Override public void run() { // TODO Auto-generated method stub for(int i=0;i<10;i++){ try{ intCounter=(i+1)*20; Thread.sleep(1000); if(i==4){ Message m = new Message(); m.what = ProgressBarA.GUI_STOP_NOTIFIER; ProgressBarA.this.myMessageHandler.sendMessage(m); break; } else{ Message m = new Message(); m.what = ProgressBarA.GUI_THREADING_NOTIFIER; ProgressBarA.this.myMessageHandler.sendMessage(m); } } catch(Exception e){ e.printStackTrace(); } } } }).start(); } }); } Handler myMessageHandler = new Handler(){ public void handleMessage(Message msg){ switch(msg.what){ case ProgressBarA.GUI_STOP_NOTIFIER: //myProgress1.setVisibility(View.GONE); //myProgress2.setVisibility(View.GONE); //Thread.currentThread().interrupt(); break; case ProgressBarA.GUI_THREADING_NOTIFIER: if(!Thread.currentThread().isInterrupted()){ myProgress1.setProgress(intCounter); myProgress1.setProgress(intCounter); setProgress(intCounter*100);//设置标题栏中前景的一个进度条进度值 //setSecondaryProgress(intCounter*100);//设置标题栏中后面的一个进度条进度值 //Thread.currentThread().interrupt(); } break; } super.handleMessage(msg); } }; }

14.SeekBar的使用，代码如下：

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1. implementsSeekBar.OnSeekBarChangeListener
2. //实现OnSeekBarChangeListener接口
3. publicvoidonProgressChanged(SeekBarseekBar,intprogress,
4. booleanfromUser){
5. //TODOAuto-generatedmethodstub
6. myProgressText.setText("当前值："+progress);
7. }
8. @Override
9. publicvoidonStartTrackingTouch(SeekBarseekBar){
10. //TODOAuto-generatedmethodstub
11. myTrackingText.setText("正在调节");
12. }
13. @Override
14. publicvoidonStopTrackingTouch(SeekBarseekBar){
15. //TODOAuto-generatedmethodstub
16. myTrackingText.setText("停止调节");
17. }
18. }

implements SeekBar.OnSeekBarChangeListener //实现OnSeekBarChangeListener接口 public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub myProgressText.setText("当前值："+ progress); } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub myTrackingText.setText("正在调节"); } @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub myTrackingText.setText("停止调节"); } }

15.Notification、NotificationManager的使用，代码如下：

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1. myIntent=newIntent(Notification01.this,Notification02.class);
2. //主要是设置点击通知时显示内容的类
3. myPendingIntent=PendingIntent.getActivity(Notification01.this,0,myIntent,0);
4. //构造Notification对象
5. myNotification=newNotification();
6. myButton1.setOnClickListener(newButton.OnClickListener(){
7. @Override
8. publicvoidonClick(Viewv){
9. //TODOAuto-generatedmethodstub
10. //设置通知在状态栏显示的图标
11. myNotification.icon=R.drawable.ic_launcher;
12. myNotification.tickerText="Button1的通知内容...";
13. //通知时发出默认的声音
14. myNotification.defaults=Notification.DEFAULT_SOUND;
15. //设置通知显示的参数
16. myNotification.setLatestEventInfo(Notification01.this,"Button1","Button1通知",myPendingIntent);
17. //可以理解为执行这个通知
18. myNotificationManager.notify(0,myNotification);
19. }
20. });

myIntent = new Intent(Notification01.this,Notification02.class); //主要是设置点击通知时显示内容的类 myPendingIntent = PendingIntent.getActivity(Notification01.this, 0, myIntent, 0); //构造Notification对象 myNotification = new Notification(); myButton1.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub //设置通知在状态栏显示的图标 myNotification.icon = R.drawable.ic_launcher; myNotification.tickerText = "Button1的通知内容..."; //通知时发出默认的声音 myNotification.defaults = Notification.DEFAULT_SOUND; //设置通知显示的参数 myNotification.setLatestEventInfo(Notification01.this,"Button1","Button1通知",myPendingIntent); //可以理解为执行这个通知 myNotificationManager.notify(0,myNotification); } });

16.ProgressDialog的使用，代码如下：

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1. myButton01=(Button)findViewById(R.id.Button1);
2. myButton02=(Button)findViewById(R.id.Button2);
3. myButton01.setOnClickListener(newButton.OnClickListener(){
4. @Override
5. publicvoidonClick(Viewv){
6. //TODOAuto-generatedmethodstub
7. //创建ProgressDialog对象
8. myProgressDialog=newProgressDialog(ProgressDialogActivity.this);
9. //设置进度条风格，风格为圆形的，旋转的
10. myProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
11. //设置ProgressDialog标题
12. myProgressDialog.setTitle("提示");
13. //设置ProgressDialog提示信息
14. myProgressDialog.setMessage("这是一个圆形进度条对话框");
15. //设置myProgressDialog标题图标
16. myProgressDialog.setIcon(R.drawable.ic_launcher);
17. //设置myProgressDialog的进度条是否不明确
18. myProgressDialog.setIndeterminate(false);
19. //设置myProgressDialog是否可以按退回键取消
20. myProgressDialog.setCancelable(true);
21. //设置myProgressDialog的一个Button
22. myProgressDialog.setButton("确定",newDialogInterface.OnClickListener(){
24. @Override
25. publicvoidonClick(DialogInterfacedialog,intwhich){
26. //TODOAuto-generatedmethodstub
27. //点击确定取消对话框
28. dialog.cancel();
29. }
30. });
31. //让ProgressDialog显示
32. myProgressDialog.show();
33. }
34. });
36. myButton02.setOnClickListener(newButton.OnClickListener(){
37. @Override
38. publicvoidonClick(Viewv){
39. //TODOAuto-generatedmethodstub
40. myCount=0;
41. //创建ProgressDialog对象
42. myProgressDialog=newProgressDialog(ProgressDialogActivity.this);
43. //设置进度条风格，风格为长形的。
44. myProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
45. //设置ProgressDialog标题
46. myProgressDialog.setTitle("提示");
47. //设置ProgressDialog提示信息
48. myProgressDialog.setMessage("这是一个长形进度条对话框");
49. //设置myProgressDialog标题图标
50. myProgressDialog.setIcon(R.drawable.ic_launcher);
51. //设置myProgressDialog进度条进度
52. myProgressDialog.setProgress(100);
53. //设置myProgressDialog的进度条是否不明确
54. myProgressDialog.setIndeterminate(false);
55. //设置myProgressDialog是否可以按退回键取消
56. myProgressDialog.setCancelable(true);
57. //设置myProgressDialog的一个Button
58. myProgressDialog.setButton("确定",newDialogInterface.OnClickListener(){
60. @Override
61. publicvoidonClick(DialogInterfacedialog,intwhich){
62. //TODOAuto-generatedmethodstub
63. //点击确定取消对话框
64. dialog.cancel();
65. }
66. });
67. //让ProgressDialog显示
68. myProgressDialog.show();
69. newThread(){
70. publicvoidrun(){
71. try{
72. while(myCount<=100){
73. //由线程来控制进度
74. myProgressDialog.setProgress(myCount++);
75. Thread.sleep(100);
76. }
77. myProgressDialog.cancel();
78. }
79. catch(InterruptedExceptione){
80. myProgressDialog.cancel();
81. }
82. }
83. }.start();
84. }
85. });

myButton01 = (Button)findViewById(R.id.Button1); myButton02 = (Button)findViewById(R.id.Button2); myButton01.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub //创建ProgressDialog对象 myProgressDialog = new ProgressDialog(ProgressDialogActivity.this); //设置进度条风格，风格为圆形的，旋转的 myProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); //设置ProgressDialog标题 myProgressDialog.setTitle("提示"); //设置ProgressDialog提示信息 myProgressDialog.setMessage("这是一个圆形进度条对话框"); //设置myProgressDialog标题图标 myProgressDialog.setIcon(R.drawable.ic_launcher); //设置myProgressDialog的进度条是否不明确 myProgressDialog.setIndeterminate(false); //设置myProgressDialog是否可以按退回键取消 myProgressDialog.setCancelable(true); //设置myProgressDialog的一个Button myProgressDialog.setButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub //点击确定取消对话框 dialog.cancel(); } }); //让ProgressDialog显示 myProgressDialog.show(); } }); myButton02.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub myCount = 0; //创建ProgressDialog对象 myProgressDialog = new ProgressDialog(ProgressDialogActivity.this); //设置进度条风格，风格为长形的。 myProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); //设置ProgressDialog标题 myProgressDialog.setTitle("提示"); //设置ProgressDialog提示信息 myProgressDialog.setMessage("这是一个长形进度条对话框"); //设置myProgressDialog标题图标 myProgressDialog.setIcon(R.drawable.ic_launcher); //设置myProgressDialog进度条进度 myProgressDialog.setProgress(100); //设置myProgressDialog的进度条是否不明确 myProgressDialog.setIndeterminate(false); //设置myProgressDialog是否可以按退回键取消 myProgressDialog.setCancelable(true); //设置myProgressDialog的一个Button myProgressDialog.setButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub //点击确定取消对话框 dialog.cancel(); } }); //让ProgressDialog显示 myProgressDialog.show(); new Thread(){ public void run(){ try{ while(myCount <= 100){ //由线程来控制进度 myProgressDialog.setProgress(myCount++); Thread.sleep(100); } myProgressDialog.cancel(); } catch(InterruptedException e){ myProgressDialog.cancel(); } } }.start(); } });

17.TabWidget的使用，代码如下：

要使用TabWidget，首先要了解TabHost，TabHost是一个用来存放Tab标签的容器。

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1. publicclassTabHostActivityextendsTabActivity{
2. TabHostmyTabHost;
4. /**Calledwhentheactivityisfirstcreated.*/
5. @Override
6. publicvoidonCreate(BundlesavedInstanceState){
7. super.onCreate(savedInstanceState);
8. setContentView(R.layout.main);
9. //获取TabHost对象
10. myTabHost=getTabHost();
11. //为TabHost添加标签，新建一个newTabSpec(newTabSpec)设置其标签和图标(setIndicator)设置内容(setContent)
12. myTabHost.addTab(myTabHost.newTabSpec("tabHost1").setIndicator("TAB1",getResources().getDrawable(R.drawable.ic_launcher)).setContent(R.id.myTabContent1));
13. myTabHost.addTab(myTabHost.newTabSpec("tabHost2").setIndicator("TAB2",getResources().getDrawable(R.drawable.ic_launcher)).setContent(R.id.myTabContent2));
14. myTabHost.addTab(myTabHost.newTabSpec("tabHost3").setIndicator("TAB3",getResources().getDrawable(R.drawable.ic_launcher)).setContent(R.id.myTabContent3));
15. //设置TabHost的背景颜色
16. myTabHost.setBackgroundColor(Color.argb(150,22,70,150));
17. //设置当前显示哪个标签
18. myTabHost.setCurrentTab(1);
19. //标签切换事件处理setOnTabChangedListener
20. myTabHost.setOnTabChangedListener(newTabHost.OnTabChangeListener(){
22. @Override
23. publicvoidonTabChanged(StringtabId){
24. //TODOAuto-generatedmethodstub
25. Dialogdialog=newAlertDialog.Builder(TabHostActivity.this).setTitle("提示").setMessage("当前选中"+tabId).setPositiveButton("确定",newDialogInterface.OnClickListener(){
27. @Override
28. publicvoidonClick(DialogInterfacedialog,intwhich){
29. //TODOAuto-generatedmethodstub
30. dialog.cancel();
31. }
32. }).create();
33. dialog.show();
34. }
35. });
36. }
37. }

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