系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList - android

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系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList

作者： webabcd

介绍
在 Android 中使用各种控件(View)

TextSwitcher -文字转换器控件（改变文字时增加一些动画效果）
Gallery -缩略图浏览器控件
ImageSwitcher -图片转换器控件（改变图片时增加一些动画效果）
GridView -网格控件
ListView -列表控件
ExpandableList -支持展开/收缩功能的列表控件

1、TextSwitcher 的 Demo
textswitcher.xml
代码 <? xmlversion="1.0"encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical" android:layout_width ="fill_parent"
android:layout_height ="fill_parent" >

< Button android:id ="@+id/btnChange" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" android:text ="改变文字" />


< TextSwitcher android:id ="@+id/textSwitcher"
android:layout_width ="fill_parent" android:layout_height ="wrap_content" />

</ LinearLayout >

_TextSwitcher.java
代码 package com.webabcd.view;

import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.TextSwitcher;
import android.widget.TextView;
import android.widget.ViewSwitcher;

public class _TextSwitcher extends Activity implements ViewSwitcher.ViewFactory{

@Override
protected void onCreate(BundlesavedInstanceState){
// TODOAuto-generatedmethodstub
super .onCreate(savedInstanceState);
this .setContentView(R.layout.textswithcer);

setTitle( " TextSwithcer " );

final TextSwitcherswitcher = (TextSwitcher)findViewById(R.id.textSwitcher);
// 指定转换器的ViewSwitcher.ViewFactory
switcher.setFactory( this );

// 设置淡入和淡出的动画效果
Animationin = AnimationUtils.loadAnimation( this ,android.R.anim.fade_in);
Animationout = AnimationUtils.loadAnimation( this ,android.R.anim.fade_out);
switcher.setInAnimation(in);
switcher.setOutAnimation(out);

// 单击一次按钮改变一次文字
ButtonbtnChange = (Button) this .findViewById(R.id.btnChange);
btnChange.setOnClickListener( new View.OnClickListener(){
@Override
public void onClick(Viewv){
switcher.setText(String.valueOf( new Random().nextInt()));
}
});
}

// 重写ViewSwitcher.ViewFactory的makeView()，返回一个View
@Override
public ViewmakeView(){
TextViewtextView = new TextView( this );
textView.setTextSize( 36 );
return textView;
}
}

2、Gallery 的 Demo
gallery.xml
代码 <? xmlversion="1.0"encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical" android:layout_width ="fill_parent"
android:layout_height ="fill_parent" >


< Gallery android:id ="@+id/gallery" android:layout_width ="fill_parent"
android:layout_height ="wrap_content" android:spacing ="20px" />

</ LinearLayout >

_Gallery.java
代码 package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.Gallery.LayoutParams;

public class _Gallery extends Activity{

@Override
protected void onCreate(BundlesavedInstanceState){
// TODOAuto-generatedmethodstub
super .onCreate(savedInstanceState);
this .setContentView(R.layout.gallery);

setTitle( " Gallery " );

Gallerygallery = (Gallery)findViewById(R.id.gallery);
// 为缩略图浏览器指定一个适配器
gallery.setAdapter( new ImageAdapter( this ));
// 响应在缩略图列表上选中某个缩略图后的事件
gallery.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView <?> parent,Viewv,
int position, long id){
Toast.makeText(_Gallery. this ,String.valueOf(position),Toast.LENGTH_SHORT).show();
}

@Override
public void onNothingSelected(AdapterView <?> arg0){

}
});
}

// 继承BaseAdapter用以实现自定义的图片适配器
public class ImageAdapter extends BaseAdapter{

private ContextmContext;

public ImageAdapter(Contextcontext){
mContext = context;
}

public int getCount(){
return mThumbIds.length;
}

public ObjectgetItem( int position){
return position;
}

public long getItemId( int position){
return position;
}

public ViewgetView( int position,ViewconvertView,ViewGroupparent){
ImageViewimage = new ImageView(mContext);

image.setImageResource(mThumbIds[position]);
image.setAdjustViewBounds( true );
image.setLayoutParams( new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));

return image;
}
}

// 需要显示的图片集合
private Integer[]mThumbIds = {R.drawable.icon01,R.drawable.icon02,
R.drawable.icon03,R.drawable.icon04,R.drawable.icon05};
}

3、ImageSwitcher 的 Demo
imageswitcher.xml
代码 <? xmlversion="1.0"encoding="utf-8" ?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical" android:layout_width ="fill_parent"
android:layout_height ="fill_parent" >

< Gallery android:id ="@+id/gallery" android:layout_width ="fill_parent"
android:layout_height ="wrap_content" android:spacing ="20px" />


< ImageSwitcher android:id ="@+id/imageSwitcher"
android:layout_width ="fill_parent" android:layout_height ="wrap_content" />

</ LinearLayout >

_ImageSwitcher.java
代码 package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;
import android.widget.Gallery.LayoutParams;

// 图片转换器的使用基本同文字转换器
// 以下是一个用ImageSwitcher+Gallery实现的经典的图片浏览器的Demo
public class _ImageSwitcher extends Activity implements
ViewSwitcher.ViewFactory{

private ImageSwitchermSwitcher;

@Override
protected void onCreate(BundlesavedInstanceState){
// TODOAuto-generatedmethodstub
super .onCreate(savedInstanceState);
this .setContentView(R.layout.imageswithcer);

setTitle( " ImageSwithcer " );

mSwitcher = (ImageSwitcher)findViewById(R.id.imageSwitcher);
mSwitcher.setFactory( this );
mSwitcher.setInAnimation(AnimationUtils.loadAnimation( this ,
android.R.anim.fade_in));
mSwitcher.setOutAnimation(AnimationUtils.loadAnimation( this ,
android.R.anim.fade_out));

Gallerygallery = (Gallery)findViewById(R.id.gallery);
gallery.setAdapter( new ImageAdapter( this ));
gallery.setOnItemSelectedListener( new AdapterView.OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView <?> parent,Viewv,
int position, long id){
mSwitcher.setImageResource(mImageIds[position]);
}

@Override
public void onNothingSelected(AdapterView <?> arg0){

}
});
}

public class ImageAdapter extends BaseAdapter{

private ContextmContext;

public ImageAdapter(Contextcontext){
mContext = context;
}

public int getCount(){
return mThumbIds.length;
}

public ObjectgetItem( int position){
return position;
}

public long getItemId( int position){
return position;
}

public ViewgetView( int position,ViewconvertView,ViewGroupparent){
ImageViewimage = new ImageView(mContext);

image.setImageResource(mThumbIds[position]);
image.setAdjustViewBounds( true );
image.setLayoutParams( new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));

return image;
}
}

private Integer[]mThumbIds = {R.drawable.icon01,R.drawable.icon02,
R.drawable.icon03,R.drawable.icon04,R.drawable.icon05};

private Integer[]mImageIds = {R.drawable.icon01,R.drawable.icon02,
R.drawable.icon03,R.drawable.icon04,R.drawable.icon05};

@Override
public ViewmakeView(){
ImageViewimage = new ImageView( this );
image.setMinimumHeight( 200 );
image.setMinimumWidth( 200 );
image.setScaleType(ImageView.ScaleType.FIT_CENTER);
image.setLayoutParams( new ImageSwitcher.LayoutParams(
LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
return image;
}
}

4、GridView 的 Demo
gridview.xml
代码 <? xmlversion="1.0"encoding="utf-8" ?>


< GridView xmlns:android ="http://schemas.android.com/apk/res/android"
android:id ="@+id/gridView" android:layout_width ="fill_parent"
android:layout_height ="fill_parent" android:padding ="10px"
android:verticalSpacing ="10px" android:horizontalSpacing ="10px"
android:numColumns ="auto_fit" android:columnWidth ="60px"
android:stretchMode ="columnWidth" android:gravity ="center" >
</ GridView >

_GridView.java
代码 package com.webabcd.view;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

public class _GridView extends Activity{

@Override
protected void onCreate(BundlesavedInstanceState){
// TODOAuto-generatedmethodstub
super .onCreate(savedInstanceState);
this .setContentView(R.layout.gridview);

setTitle( " GridView " );

GridViewgridView = (GridView)findViewById(R.id.gridView);
// 指定网格控件的适配器为自定义的图片适配器
gridView.setAdapter( new ImageAdapter( this ));
}

// 自定义的图片适配器
public class ImageAdapter extends BaseAdapter{

private ContextmContext;

public ImageAdapter(Contextcontext){
mContext = context;
}

public int getCount(){
return mThumbIds.length;
}

public ObjectgetItem( int position){
return position;
}

public long getItemId( int position){
return position;
}

public ViewgetView( int position,ViewconvertView,ViewGroupparent){
ImageViewimageView;
if (convertView == null ){
imageView = new ImageView(mContext);
imageView.setLayoutParams( new GridView.LayoutParams( 48 , 48 ));
imageView.setAdjustViewBounds( false );
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding( 5 , 5 , 5 , 5 );
} else {
imageView = (ImageView)convertView;
}

imageView.setImageResource(mThumbIds[position]);

return imageView;
}

// 网格控件所需图片数据的数据源
private Integer[]mThumbIds = {R.drawable.icon01,R.drawable.icon02,
R.drawable.icon03,R.drawable.icon04,R.drawable.icon05};
}
}

5、ListView 的 Demo
main_list_adapter.xml
代码 <? xmlversion="1.0"encoding="utf-8" ?>

< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="horizontal" android:layout_width ="fill_parent"
android:layout_height ="fill_parent" >

< TextView android:id ="@+id/text" android:layout_width ="wrap_content"
android:layout_height ="wrap_content" android:textSize ="16sp" >
</ TextView >

</ LinearLayout >

MainListAdapter.java
代码 package com.webabcd.view;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

// 继承BaseAdapter以实现自定义的列表适配器
public class MainListAdapter extends BaseAdapter{

private LayoutInflatermInflater;
private List < String > mData;

public MainListAdapter(Contextcontext,List < String > data){
mInflater = LayoutInflater.from(context);
mData = data;
}

@Override
public int getCount(){
return mData.size();
}

@Override
public ObjectgetItem( int position){
return mData.get(position);
}

@Override
public long getItemId( int position){
return position;
}

@Override
public ViewgetView( int position,ViewconvertView,ViewGroupparent){

TextViewtext;

if (convertView == null ){
// 指定一个layout作为自定义列表适配器的layout
convertView = mInflater.inflate(R.layout.main_list_adapter, null );
text = (TextView)convertView.findViewById(R.id.text);
convertView.setTag(text);
} else {
text = (TextView)convertView.getTag();
}

StringmItem = mData.get(position);
text.setText(mItem);

return convertView;
}
}
Main.java
代码 package com.webabcd.view;

import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

// 此处要继承ListActivity，用以实现ListView的功能
public class Main extends ListActivity{

private List < String > mData;

/** Calledwhentheactivityisfirstcreated. */
@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);

setTheme(android.R.style.Theme_Light);
setContentView(R.layout.main);
mData = getData();

// 使用自定义的列表适配器来展现数据
MainListAdapteradapter = new MainListAdapter( this ,mData);

// 如需使用系统内置的列表适配器，则可以使用类似如下的方法
// ArrayAdapter<String>adapter=newArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1,mData);

this .setListAdapter(adapter);
}

// ListView的数据源
private List < String > getData(){
List < String > items = new ArrayList < String > ();

items.add( " TextView " );
items.add( " Button " );
items.add( " ImageButton " );
items.add( " ImageView " );
items.add( " CheckBox " );
items.add( " RadioButton " );
items.add( " AnalogClock " );
items.add( " DigitalClock " );
items.add( " DatePicker " );
items.add( " TimePicker " );
items.add( " ToggleButton " );
items.add( " EditText " );
items.add( " ProgressBar " );
items.add( " SeekBar " );
items.add( " AutoCompleteTextView " );
items.add( " MultiAutoCompleteTextView " );
items.add( " ZoomControls " );
items.add( " Include " );
items.add( " VideoView " );
items.add( " WebView " );
items.add( " RatingBar " );
items.add( " Tab " );
items.add( " Spinner " );
items.add( " Chronometer " );
items.add( " ScrollView " );
items.add( " TextSwitcher " );
items.add( " ListView " );
items.add( " Gallery " );
items.add( " ImageSwitcher " );
items.add( " GridView " );
items.add( " ExpandableList " );

return items;
}

// ListView中某项被选中后的逻辑
@Override
protected void onListItemClick(ListViewl,Viewv, int position, long id){
Intentintent = new Intent();
intent.setClassName( this , " com.webabcd.view._ " + mData.get(position));

startActivityForResult(intent, 0 );
}
}

6、ExpandableList 的 Demo
_ExpandableList.java
代码 package com.webabcd.view;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

// ExpandableList-可展开/收缩列表
// 继承ExpandableListActivity以实现列表的可展开/收缩的功能
public class _ExpandableList extends ExpandableListActivity{

private ExpandableListAdaptermAdapter;

@Override
protected void onCreate(BundlesavedInstanceState){
// TODOAuto-generatedmethodstub
super .onCreate(savedInstanceState);

setTitle( " ExpandableList " );

mAdapter = new MyExpandableListAdapter();
setListAdapter(mAdapter);
registerForContextMenu( this .getExpandableListView());
}

// 为列表的每一项创建上下文菜单（即长按后呼出的菜单）
@Override
public void onCreateContextMenu(ContextMenumenu,Viewv,
ContextMenuInfomenuInfo){
menu.setHeaderTitle( " ContextMenu " );
menu.add( 0 , 0 , 0 , " ContextMenu " );
}

// 单击上下文菜单后的逻辑
@Override
public boolean onContextItemSelected(MenuItemitem){
ExpandableListContextMenuInfoinfo = (ExpandableListContextMenuInfo)item.getMenuInfo();
Stringtitle = ((TextView)info.targetView).getText().toString();

int type = ExpandableListView.getPackedPositionType(info.packedPosition);
if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD){
int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);

Toast.makeText( this ,title + " -GroupIndex: " + groupPos + " ChildIndex: " + childPos,Toast.LENGTH_SHORT).show();

return true ;
} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP){
int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
Toast.makeText( this ,title + " -GroupIndex: " + groupPos,Toast.LENGTH_SHORT).show();

return true ;
}

return false ;
}

public class MyExpandableListAdapter extends BaseExpandableListAdapter{

// 父列表数据
private String[]groups =
{
" group1 " ,
" group2 " ,
" group3 " ,
" group4 "
};
// 子列表数据
private String[][]children =
{
{ " child1 " },
{ " child1 " , " child2 " },
{ " child1 " , " child2 " , " child3 " },
{ " child1 " , " child2 " , " child3 " , " child4 " }
};

@Override
public ObjectgetChild( int groupPosition, int childPosition){
return children[groupPosition][childPosition];
}

@Override
public long getChildId( int groupPosition, int childPosition){
return childPosition;
}

@Override
public int getChildrenCount( int groupPosition){
return children[groupPosition].length;
}

// 取子列表中的某一项的View
@Override
public ViewgetChildView( int groupPosition, int childPosition,
boolean isLastChild,ViewconvertView,ViewGroupparent){
TextViewtextView = getGenericView();
textView.setText(getChild(groupPosition,childPosition).toString());
return textView;
}

@Override
public ObjectgetGroup( int groupPosition){
return groups[groupPosition];
}

@Override
public int getGroupCount(){
return groups.length;
}

@Override
public long getGroupId( int groupPosition){
return groupPosition;
}

// 取父列表中的某一项的View
@Override
public ViewgetGroupView( int groupPosition, boolean isExpanded,
ViewconvertView,ViewGroupparent){
TextViewtextView = getGenericView();
textView.setText(getGroup(groupPosition).toString());
return textView;
}

@Override
public boolean hasStableIds(){
return true ;
}

@Override
public boolean isChildSelectable( int groupPosition, int childPosition){
return true ;
}

// 获取某一项的View的逻辑
private TextViewgetGenericView(){
AbsListView.LayoutParamslp = new AbsListView.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT, 48 );
TextViewtextView = new TextView(_ExpandableList. this );
textView.setLayoutParams(lp);
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
textView.setPadding( 32 , 0 , 0 , 0 );
return textView;
}
}
}

OK
[源码下载]

系出名门Android(8) - 控件(View)之TextSwitcher, Gallery, ImageSwitcher, GridView, ListView, ExpandableList

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