android之Itent.ACTION_PICK Intent.ACTION_GET_CONTENT妙用

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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"));  

 

 

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

    public class TestActivity extends Activity {                      @Override          public void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);               setContentView(R.layout.main);               this.setTitle("TestActivity");                              Intent i = this.getIntent();                              Uri u = i.getData();                              try {                   playMusic(u);               } catch (IllegalArgumentException e) {                   // TODO Auto-generated catch block                   e.printStackTrace();               } catch (SecurityException e) {                   // TODO Auto-generated catch block                   e.printStackTrace();               } catch (IllegalStateException e) {                   // TODO Auto-generated catch block                   e.printStackTrace();               } catch (IOException e) {                   // TODO Auto-generated catch block                   e.printStackTrace();               }           }                      public void playMusic(Uri uri) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException{               MediaPlayer mp = new MediaPlayer();               mp.setDataSource(this, uri);               mp.prepare();               mp.start();           }       }  

2. 在AndroidManifest 注册TestActivity

    <activity android:name=".TestActivity"                        android:label="TestActivity">                   <intent-filter>                       <action android:name="android.intent.action.GET_CONTENT" />                        <category android:name="android.intent.category.DEFAULT" />                        <category android:name="android.intent.category.OPENABLE" />                        <data android:mimeType="audio/music1" />                   </intent-filter>               </activity>  

3. 使用TestActivity

    public void sendChooser(){               Intent intent = new Intent(Intent.ACTION_GET_CONTENT);                              intent.setDataAndType(Uri.parse("file:///sdcard/DCIM/cc.mp3"), "audio/music1");                     startActivity(Intent.createChooser(intent, "Select music1 app"));           }  

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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