Android Intent.createChooser() 妙用
Intent.createChooser(ntent target, CharSequence title)
其实 大家对该功能第一影响就是ApiDemo 里面的 其只有区区几行代码 提取为：
Java代码
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("audio/*");
startActivity(Intent.createChooser(intent, "Select music"));
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
Java代码
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);
Intent.createChooser(ntent target, CharSequence title)
其实 大家对该功能第一影响就是ApiDemo 里面的 其只有区区几行代码 提取为：
Java代码
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("audio/*");
startActivity(Intent.createChooser(intent, "Select music"));
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
Java代码
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();
}
}
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
Java代码
< 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>
< 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
Java代码
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"));
}
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：
