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829天前1.新建一个类extends BroadcastReceiver,并重写父类的onReceive()方法 |
3.在onCreat()方法中创建一个IntentFilter的实例,注册要接收的广播类型 |
代码: |
public class BroadCastTest extends AppCompatActivity { |
private IntentFilter intentFilter; |
private NetWorkChangeReceiver networkChangeReceiver; |
@Override |
protected void onCreate(Bundle savedInstanceState) { |
super.onCreate(savedInstanceState); |
setContentView(R.layout.activity_broad_cast_test); |
intentFilter=new IntentFilter(); |
intentFilter.addAction("android.media.VOLUME_CHANGED_ACTION"); |
networkChangeReceiver=new NetWorkChangeReceiver(); |
registerReceiver(networkChangeReceiver,intentFilter); |
} |
//动态注册,最后一定要销毁 |
@Override |
protected void onDestroy() { |
super.onDestroy(); |
unregisterReceiver(networkChangeReceiver); |
} |
class NetWorkChangeReceiver extends BroadcastReceiver { |
@Override |
//接收到广播后,要执行的代码 |
public void onReceive(Context context, Intent intent) { |
Toast.makeText(context, "音量改变 ", Toast.LENGTH_LONG).show(); |
} |
} |
} |
中级程序员
by: 觉 发表于：2017-09-19 16:17:51 顶(0) | 踩(0) 回复
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