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

yolinfeng
 yolinfeng
发布于 2015/06/06 17:05
字数 2070
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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
<? xml version="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 - 文字转换器控件(改变文字时增加一些动画效果)
    
-->
    
< 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(Bundle savedInstanceState) {
        
//  TODO Auto-generated method stub
         super .onCreate(savedInstanceState);
        
this .setContentView(R.layout.textswithcer);

        setTitle(
" TextSwithcer " );

        
final  TextSwitcher switcher  =  (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
        Animation in  =  AnimationUtils.loadAnimation( this , android.R.anim.fade_in);
        Animation out 
=  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
        Button btnChange  =  (Button)  this .findViewById(R.id.btnChange);
        btnChange.setOnClickListener(
new  View.OnClickListener() {
            @Override
            
public   void  onClick(View v) {
                switcher.setText(String.valueOf(
new  Random().nextInt()));
            }
        });
    }

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


2、Gallery 的 Demo
gallery.xml
代码
<? xml version="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 - 缩略图浏览器控件
            spacing - 缩略图列表中各个缩略图之间的间距
    
-->
    
< 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(Bundle savedInstanceState) {
        
//  TODO Auto-generated method stub
         super .onCreate(savedInstanceState);
        
this .setContentView(R.layout.gallery);

        setTitle(
" Gallery " );

        Gallery gallery 
=  (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, View v,
                    
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  Context mContext;

        
public  ImageAdapter(Context context) {
            mContext 
=  context;
        }

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

        
public  Object getItem( int  position) {
            
return  position;
        }

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

        
public  View getView( int  position, View convertView, ViewGroup parent) {
            ImageView image 
=   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
<? xml version="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 - 图片转换器控件(改变图片时增加一些动画效果)
    
-->
    
< 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  ImageSwitcher mSwitcher;

    @Override
    
protected   void  onCreate(Bundle savedInstanceState) {
        
//  TODO Auto-generated method stub
         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));

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

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

            }
        });
    }

    
public   class  ImageAdapter  extends  BaseAdapter {

        
private  Context mContext;

        
public  ImageAdapter(Context context) {
            mContext 
=  context;
        }

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

        
public  Object getItem( int  position) {
            
return  position;
        }

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

        
public  View getView( int  position, View convertView, ViewGroup parent) {
            ImageView image 
=   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  View makeView() {
        ImageView image 
=   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
<? xml version="1.0" encoding="utf-8" ?>

<!--
    GridView - 网格控件
        numColumns="auto_fit" - 列数自适应
        stretchMode - 缩放模式(stretchMode="columnWidth" - 缩放与列宽大小同步)
-->
< 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(Bundle savedInstanceState) {
        
//  TODO Auto-generated method stub
         super .onCreate(savedInstanceState);
        
this .setContentView(R.layout.gridview);

        setTitle(
" GridView " );

        GridView gridView 
=  (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  Context mContext;

        
public  ImageAdapter(Context context) {
            mContext 
=  context;
        }

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

        
public  Object getItem( int  position) {
            
return  position;
        }

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

        
public  View getView( int  position, View convertView, ViewGroup parent) {
            ImageView imageView;
            
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
<? xml version="1.0" encoding="utf-8" ?>
<!--
    自定义列表适配器的 layout
-->
< 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  LayoutInflater mInflater;
    
private  List < String >  mData;

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

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

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

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

    @Override
    
public  View getView( int  position, View convertView, ViewGroup parent) {

        TextView text;

        
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();
        }
        
        String mItem 
=  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;
    
    
/**  Called when the activity is first created.  */
    @Override
    
public   void  onCreate(Bundle savedInstanceState) {
        
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
        MainListAdapter adapter  =   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 = new ArrayAdapter<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(ListView l, View v,  int  position,  long  id) {
        Intent intent 
=   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  ExpandableListAdapter mAdapter;

    @Override
    
protected   void  onCreate(Bundle savedInstanceState) {
        
//  TODO Auto-generated method stub
         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(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        menu.setHeaderTitle(
" ContextMenu " );
        menu.add(
0 0 0 " ContextMenu " );
    }

    
//  单击上下文菜单后的逻辑
    @Override
    
public   boolean  onContextItemSelected(MenuItem item) {
        ExpandableListContextMenuInfo info 
=  (ExpandableListContextMenuInfo) item.getMenuInfo();
        String title 
=  ((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  +   "  - Group Index:  "   +  groupPos  +   "  Child Index:  "   +  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  +   "  - Group Index:  "   +  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  Object getChild( 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  View getChildView( int  groupPosition,  int  childPosition,
                
boolean  isLastChild, View convertView, ViewGroup parent) {
            TextView textView 
=  getGenericView();
            textView.setText(getChild(groupPosition, childPosition).toString());
            
return  textView;
        }

        @Override
        
public  Object getGroup( 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  View getGroupView( int  groupPosition,  boolean  isExpanded,
                View convertView, ViewGroup parent) {
            TextView textView 
=  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  TextView getGenericView() {
            AbsListView.LayoutParams lp 
=   new  AbsListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, 
48 );
            TextView textView 
=   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]

本文转载自:http://www.cnblogs.com/webabcd/archive/2010/01/27/1657171.html

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