Android 广播接收器的问题

Question

我多次发现这个问题，但 none 的解决方案似乎有效。

清单中有以下内容：

<receiver android:name=".noactivity.Airplane">
        <intent-filter>
            <action android:name="android.intent.action.AIRPLANE_MODE_CHANGED"/>
        </intent-filter>
</receiver>

以及以下 class：

public class Airplane extends BroadcastReceiver {

public Airplane(){
}

@Override
public void onReceive(Context context, Intent intent) {
    Log.d("AirplaneMode", "Service state changed");
    Toast.makeText(context,"Airplane mode changed",Toast.LENGTH_LONG).show();
}}

但是，如果我更改飞行模式，则没有任何反应。可以肯定的是，我还添加了：

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    registerReceiver(new Airplane(), new IntentFilter("android.intent.action.AIRPLANE_MODE_CHANGED"));
}}

什么也没用。你们有谁知道我做错了什么吗？

Answer 1

我没有在清单中添加接收器就成功地使用了它。在你 activity 添加这个：

    @Override
protected void onResume() {

    //register receiver for air plane mode states
    IntentFilter airPlaneModeFilter = new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED);
    registerReceiver(airPlaneModeReceiver, airPlaneModeFilter);

    super.onResume();
}

private BroadcastReceiver airPlaneModeReceiver = new BroadcastReceiver() {@Override
    public void onReceive(Context context, Intent intent) {
        boolean airPlaneModeEnabled = intent.getBooleanExtra("state", false);
        if (airPlaneModeEnabled) {

} else {

}
    }
};

@Override
protected void onPause() {
    if (airPlaneModeReceiver != null) unregisterReceiver(airPlaneModeReceiver);

    super.onPause();
}

Android 广播接收器的问题

Problems with the Android Broadcast Receiver

java

android

broadcastreceiver