android之Itent.ACTION_PICK Intent.ACTION_GET_CONTENT妙用

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。

Intentintent=newIntent(Intent.ACTION_GET_CONTENT);
intent.setType("audio/*");
startActivity(Intent.createChooser(intent,"Selectmusic"));

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("audio/*");
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

publicclassTestActivityextendsActivity{

@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.setTitle("TestActivity");

Intenti=this.getIntent();

Uriu=i.getData();

try{
playMusic(u);
}catch(IllegalArgumentExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(SecurityExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IllegalStateExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}

publicvoidplayMusic(Uriuri)throwsIllegalArgumentException,SecurityException,IllegalStateException,IOException{
MediaPlayermp=newMediaPlayer();
mp.setDataSource(this,uri);
mp.prepare();
mp.start();
}
}

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

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

<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

publicvoidsendChooser(){
Intentintent=newIntent(Intent.ACTION_GET_CONTENT);

intent.setDataAndType(Uri.parse("file:///sdcard/DCIM/cc.mp3"),"audio/music1");

startActivity(Intent.createChooser(intent,"Selectmusic1app"));
}

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);