你是不是很多时候,想从弹出的电话本姓名列表中中查找到某个人,然后再获取该人的详细信息呢?

你是不是想选择从弹出的列表中选择一张图片,然后将其进行进一步的操作呢?

如果,你想,那你是不是很像知道,我们应该怎么让其弹出来一张选择列表,又应该怎么代码实现后边的操作呢?

Itent.ACTION_PICK  Intent.ACTION_GET_CONTENT 两者都可以完成类似的功能,让我们一起来看下例子:

 

 

第一:Intent.ACTION_PICK

 

首先添加一个权限: 
<uses-permission android:name="android.permission.READ_CONTACTS"/> 
发起一个 Contact Picker 
Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI); 
startActivityForResult(intent, PICK_CONTACT); 
重写方法 
@Override 
public void onActivityResult(int reqCode, int resultCode, Intent data) 
  {  
      super.onActivityResult(reqCode, resultCode, data);  
        switch (reqCode) { 
             case (PICK_CONTACT) :      
             if (resultCode == Activity.RESULT_OK) {        
             Uri contactData = data.getData();        
             Cursor c =  managedQuery(contactData, null, null, null, null);        
             if (c.moveToFirst()) {          
                String name = c.getString(c.getColumnIndexOrThrow(People.NAME));          
                // TODO Whatever you want to do with the selected contact name.        
                                 }      
                      }      
               
      break;  
                
         } 
   } 

例如 
String[] columns = new String[] {People.NAME}; 
int[] names = new int[] {R.id.row_entry}; 
mAdapter = new SimpleCursorAdapter(this, R.layout.mycontacts, C, columns, names); 
setListAdapter(mAdapter);
 
 
第二:Intent.ACTION_GET_CONTENT
 
我们可以发现,其实action_get_content是通过intent中设置的type属性来判断具体调用哪个程序的。
    1. Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   
    2. intent.setType("audio/*");   
    3. startActivity(Intent.createChooser(intent, "Select music"));  

<span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;">Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("audio/*");
startActivity(Intent.createChooser(intent, "Select music"));</span></span>

执行之 会弹出一个对话框 效果为:

其实 对于这段代码 大家应该都能猜出什么意思  现自己模拟并理解之

 

 

 

[代码]

 

1. 定义TestActivity 用于根据传入Uri  播放目标

 

Java代码
  1. public class TestActivity extends Activity {   
  2.        
  3.     @Override  
  4.     public void onCreate(Bundle savedInstanceState) {   
  5.         super.onCreate(savedInstanceState);   
  6.         setContentView(R.layout.main);   
  7.         this.setTitle("TestActivity");   
  8.            
  9.         Intent i = this.getIntent();   
  10.            
  11.         Uri u = i.getData();   
  12.            
  13.         try {   
  14.             playMusic(u);   
  15.         } catch (IllegalArgumentException e) {   
  16.             // TODO Auto-generated catch block   
  17.             e.printStackTrace();   
  18.         } catch (SecurityException e) {   
  19.             // TODO Auto-generated catch block   
  20.             e.printStackTrace();   
  21.         } catch (IllegalStateException e) {   
  22.             // TODO Auto-generated catch block   
  23.             e.printStackTrace();   
  24.         } catch (IOException e) {   
  25.             // TODO Auto-generated catch block   
  26.             e.printStackTrace();   
  27.         }   
  28.     }   
  29.        
  30.     public void playMusic(Uri uri) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException{   
  31.         MediaPlayer mp = new MediaPlayer();   
  32.         mp.setDataSource(this, uri);   
  33.         mp.prepare();   
  34.         mp.start();   
  35.     }   
  36. }  
[java] 
  1. <span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;">public class TestActivity extends Activity {  
  2.       
  3.     @Override  
  4.     public void onCreate(Bundle savedInstanceState) {  
  5.         super.onCreate(savedInstanceState);  
  6.         setContentView(R.layout.main);  
  7.         this.setTitle("TestActivity");  
  8.           
  9.         Intent i = this.getIntent();  
  10.           
  11.         Uri u = i.getData();  
  12.           
  13.         try {  
  14.             playMusic(u);  
  15.         } catch (IllegalArgumentException e) {  
  16.             // TODO Auto-generated catch block  
  17.             e.printStackTrace();  
  18.         } catch (SecurityException e) {  
  19.             // TODO Auto-generated catch block  
  20.             e.printStackTrace();  
  21.         } catch (IllegalStateException e) {  
  22.             // TODO Auto-generated catch block  
  23.             e.printStackTrace();  
  24.         } catch (IOException e) {  
  25.             // TODO Auto-generated catch block  
  26.             e.printStackTrace();  
  27.         }  
  28.     }  
  29.       
  30.     public void playMusic(Uri uri) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException{  
  31.         MediaPlayer mp = new MediaPlayer();  
  32.         mp.setDataSource(this, uri);  
  33.         mp.prepare();  
  34.         mp.start();  
  35.     }  
  36. }</span></span>  

 

 

 

2. 在AndroidManifest 注册TestActivity

 

Java代码
  1. <activity android:name=".TestActivity"  
  2.                   android:label="TestActivity">   
  3.             <intent-filter>   
  4.                 <action android:name="android.intent.action.GET_CONTENT" />   
  5.                  <category android:name="android.intent.category.DEFAULT" />   
  6.                  <category android:name="android.intent.category.OPENABLE" />   
  7.                  <data android:mimeType="audio/music1" />   
  8.             </intent-filter>   
  9.         </activity>  
[java] 
  1. <span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;"><activity android:name=".TestActivity"  
  2.                   android:label="TestActivity">  
  3.             <intent-filter>  
  4.                 <action android:name="android.intent.action.GET_CONTENT" />  
  5.                  <category android:name="android.intent.category.DEFAULT" />  
  6.                  <category android:name="android.intent.category.OPENABLE" />  
  7.                  <data android:mimeType="audio/music1" />  
  8.             </intent-filter>  
  9.         </activity></span></span>  

 

 

 

3. 使用TestActivity

 

Java代码
  1. public void sendChooser(){   
  2.         Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   
  3.            
  4.         intent.setDataAndType(Uri.parse("file:///sdcard/DCIM/cc.mp3"), "audio/music1");   
  5.   
  6.         startActivity(Intent.createChooser(intent, "Select music1 app"));   
  7.     }  
[java] 
  1. <span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;">public void sendChooser(){  
  2.         Intent intent = new Intent(Intent.ACTION_GET_CONTENT);  
  3.           
  4.         intent.setDataAndType(Uri.parse("file:///sdcard/DCIM/cc.mp3"), "audio/music1");  
  5.   
  6.         startActivity(Intent.createChooser(intent, "Select music1 app"));  
  7.     }</span></span>  

 

 

4. emulator 运行截图:

 

 

 

此外:

 

   //选择图片 requestCode 返回的标识

  Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT); //"android.intent.action.GET_CONTENT"

  innerIntent.setType(contentType); //查看类型 String IMAGE_UNSPECIFIED = "image/*";

  Intent wrapperIntent = Intent.createChooser(innerIntent, null);

  ((Activity) context).startActivityForResult(wrapperIntent, requestCode);

 

  //视频

  Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);

  innerIntent.setType(contentType); //String VIDEO_UNSPECIFIED = "video/*";

  Intent wrapperIntent = Intent.createChooser(innerIntent, null);

  ((Activity) context).startActivityForResult(wrapperIntent, requestCode);

 

  //添加音频

  Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);

  innerIntent.setType(contentType); //String VIDEO_UNSPECIFIED = "video/*";

  Intent wrapperIntent = Intent.createChooser(innerIntent, null);

  ((Activity) context).startActivityForResult(wrapperIntent, requestCode);

 

  //录音

  Intent intent = new Intent(Intent.ACTION_GET_CONTENT);

  intent.setType(ContentType.AUDIO_AMR); //String AUDIO_AMR = "audio/amr";

  intent.setClassName("com.android.soundrecorder",

  "com.android.soundrecorder.SoundRecorder");

  ((Activity) context).startActivityForResult(intent, requestCode);

 

  //拍摄视频

  int durationLimit = getVideoCaptureDurationLimit(); //SystemProperties.getInt("ro.media.enc.lprof.duration", 60);

  Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);

  intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);

  intent.putExtra(MediaStore.EXTRA_SIZE_LIMIT, sizeLimit);

  intent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, durationLimit);

  startActivityForResult(intent, REQUEST_CODE_TAKE_VIDEO);

 

  //拍照 REQUEST_CODE_TAKE_PICTURE 为返回的标识

  Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //"android.media.action.IMAGE_CAPTURE";

  intent.putExtra(MediaStore.EXTRA_OUTPUT, Mms.ScrapSpace.CONTENT_URI); // output,Uri.parse("content://mms/scrapSpace");

  startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE);

 

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