android - 当应用程序未运行时，用于在 ANDROID 中打开/关闭屏幕的 BroadcastReceiver

Question

我想检测屏幕关闭和打开事件，因为我创建了 BroadcastReceiver，它仅在应用程序运行时正常工作，当我从任务管理器中删除应用程序时，它不起作用。

Activity :

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    try{
        BroadcastReceiver myrcver  = new BootReceiver();
        IntentFilter screenStateFilter = new IntentFilter();
        screenStateFilter.addAction(Intent.ACTION_SCREEN_ON);
        screenStateFilter.addAction(Intent.ACTION_SCREEN_OFF);
        registerReceiver(myrcver, screenStateFilter);
    }
    catch (Exception e){
        e.fillInStackTrace();
    }
}

list :

<receiver
        android:name=".BootReceiver"
        android:enabled="true"
        android:exported="true"
        android:label="BootReceiver">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.SCREEN_OFF" />
            <action android:name="android.intent.action.SCREEN_ON" />
        </intent-filter>
    </receiver>

广播接收器:

public class BootReceiver extends BroadcastReceiver {
boolean screenOff;
@Override
public void onReceive(Context context, Intent intent) {
    try {
        if ("android.intent.action.SCREEN_ON".equals(intent.getAction())) {
            if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
                screenOff = true;
            } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
                screenOff = false;
            }
            Intent i = new Intent(context, UpdateService.class);
            i.putExtra("screen_state", screenOff);
            context.startService(i);
        }
    }
    catch (Exception e){
        e.fillInStackTrace();
    }
}

}

提前感谢帮助。

Answer 1

如果您希望它在后台运行，即使应用程序未运行，您也必须创建一个服务。
在服务类中，您必须注册到您的接收器。

public class ScreenOnOffService extends Service {

    private ScreenOnOffReceiver mScreenReceiver;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        registerScreenStatusReceiver();
    }

    @Override
    public void onDestroy() {
        unregisterScreenStatusReceiver();
    }

    private void registerScreenStatusReceiver() {
        mScreenReceiver = new ScreenOnOffReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_SCREEN_ON);
        registerReceiver(mScreenReceiver, filter);
    }

    private void unregisterScreenStatusReceiver() {
        try {
            if (mScreenReceiver != null) {
                unregisterReceiver(mScreenReceiver);
            }
        } catch (IllegalArgumentException e) {}
    }
}

创建服务类后，不要忘记将您的服务添加到 list 中:

<service android:name="com.myapp.services.ScreenOnOffService" />

然后要启动服务，您可以在主要 Activity 中编写以下内容:

Intent intent = new Intent(this, ScreenOnOffService.class);
startService(intent);

对于广播类:

public class ScreenOnOffReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
            Log.d("StackOverflow", "Screen Off");

        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            Log.d("StackOverflow", "Screen On");
        }
    }
}

备注 : 对我来说 screen off和 screen on ，做了 不是 在 manifest 内工作，但仅在运行时。