Android相册及小小秒表震动(17)
16lz
2021-01-24
说到相册不得不介绍Android中一种重要的视图,网格视图:GridView是以网格形式显示所有的组件的,例如制作相册,所有的图片以相同大小显示在格子里
- 网格视图制作相册
两种方法,一种定义simpleAdapter这一种与前面ListView封装十分相似
那么一样要用到模板grid_layout.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#000000" android:orientation="horizontal" > <ImageView android:id="@+id/img" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="3px" android:scaleType="center" /></LinearLayout>
我们只需要放图片,接着我们在drawable文件夹中保存几张图片,均以l开头格式
定义Main组件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" tools:context=".MainActivity" > <GridView android:id="@+id/gridView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:stretchMode="columnWidth" android:numColumns="3" > </GridView></LinearLayout>
在面代码中我们仍会定义一个initAdapter()方法,此方法通过反射机制取出定义的全部图片,这一节前一节课讲过。
定义Activity程序:
public class MainActivity extends Activity {private List<Map<String,Integer>> list=new ArrayList<Map<String,Integer>>();private SimpleAdapter simpleadapter=null;private GridView gridview=null;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);this.gridview=(GridView)super.findViewById(R.id.gridView);this.initAdapter();//初始化适配器this.gridview.setAdapter(simpleadapter);//设置图片,将封装好的图片放入this.gridview.setOnItemClickListener(new ItemListener());//设置组件监听器}private class ItemListener implements OnItemClickListener{@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int position,long id) {// TODO Auto-generated method stub//相当于之前的转换工厂,不使用将会报错ImageView imageview=new ImageView(MainActivity.this);imageview.setBackgroundColor(0xFFFFFFFF);//设置背景imageview.setScaleType(ImageView.ScaleType.CENTER);//居中//自适应图片imageview.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));//取出初始化适配器装入的mapMap<String,Integer> map=(Map<String,Integer>)MainActivity.this.simpleadapter.getItem(position);//开始放图imageview.setImageResource(map.get("img"));Dialog dialog=new AlertDialog.Builder(MainActivity.this).setIcon(R.drawable.check).setTitle("查看图片").setView(imageview).setNegativeButton("关闭", null).create();dialog.show();}}public boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}private void initAdapter() {// TODO Auto-generated method stubField[] field=R.drawable.class.getDeclaredFields();//取得全部属性,反射机制动态取图for(int i=0;i<field.length;i++){if(field[i].getName().startsWith("h")){Map<String,Integer> map=new HashMap<String,Integer>();try {map.put("img", field[i].getInt(R.drawable.class));//图片资源放入map} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalArgumentException e) {// TODO Auto-generated catch blocke.printStackTrace();}this.list.add(map); //保存map}}//使用参见listview博客this.simpleadapter=new SimpleAdapter(this,this.list,R.layout.grid_layout,//模板new String[]{"img"},//将要装入的键new int[]{R.id.img});//装的值}}
实现一个每当用户选择一张图片,就会弹出一个对话框显示用户选择的图片。程序运行效果如下:
点击某一图片后:
第二种方法是定义一个适配器类,继承BaseAdapter
这里不再对第二种方法多做阐述,为了以后设计方便建议采用第一种方法,1符合MVC设计模式
- 时钟组件
直接布局文件中设置时钟组件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <AnalogClock android:id="@+id/analogClock1" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>
然后效果图就出来了,可以再加上DIgitalClock
- 计时器:Chronometer 本节我们来做个秒表小小闹钟到点会震动提示
首先定义布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" tools:context=".MainActivity" > <Chronometer android:id="@+id/chronometer1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Chronometer" /> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" > <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="开始" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="停止" /> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="复位" /> <Button android:id="@+id/button4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="格式化显示" /> </LinearLayout></LinearLayout>
然后定义acticity代码
public class MainActivity extends Activity {private Chronometer clock=null;private Button start=null;//开始计时private Button stop=null;//停止计时private Button base=null;//设置基准时间private Button format=null;//设置格式private Vibrator vibrator=null;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);this.clock=(Chronometer)super.findViewById(R.id.chronometer1);this.start=(Button)super.findViewById(R.id.button1);this.stop=(Button)super.findViewById(R.id.button2);this.base=(Button)super.findViewById(R.id.button3);this.format=(Button)super.findViewById(R.id.button4);this.vibrator=(Vibrator)super.getApplication().getSystemService(Service.VIBRATOR_SERVICE);this.start.setOnClickListener(new StartListener());this.stop.setOnClickListener(new StopListener());this.base.setOnClickListener(new BaseListener());this.format.setOnClickListener(new FormatListener());this.clock.setOnChronometerTickListener(new OnChronometer());}private class OnChronometer implements OnChronometerTickListener{@Overridepublic void onChronometerTick(Chronometer arg0) {// TODO Auto-generated method stubString time=clock.getText().toString().replaceAll("[^(\\d{2}:\\d{2})]", "");if("01:00".equals(time)){MainActivity.this.vibrator.vibrate(new long[]{1000, 10,1000,100},0);//设置震动周期以及循环震动}}}private class StartListener implements OnClickListener{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubMainActivity.this.clock.start();//开始计时}}private class StopListener implements OnClickListener{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubMainActivity.this.clock.stop();//停止计时MainActivity.this.vibrator.cancel();//取消震动}}private class BaseListener implements OnClickListener{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubMainActivity.this.clock.setBase(SystemClock.elapsedRealtime());//复位}}private class FormatListener implements OnClickListener{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubMainActivity.this.clock.setFormat("新显示格式:%s。");}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}
最后记得配置权限
:
<uses-permission android:name="android.permission.VIBRATE" />
最后运行效果如下:
设置满一分钟震动
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