无效的广播接收器和 Oreo + 设备不工作

Question

public class ScreenReceiver extends BroadcastReceiver {

    private boolean screenOff;

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF))    {
            screenOff = true;
        } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
            screenOff = false;
        }

    }


   <receiver
             android:name=".ScreenReceiver"
             android:enabled="true"
             android:exported="true">
             <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
                 <action android:name="android.intent.action.DREAMING_STARTED" />
                <action android:name="android.intent.action.DREAMING_STOPPED" />
                 <action android:name="android.intent.action.CLOSE_SYSTEM_DIALOGS" />
                 <action android:name="android.intent.action.SCREEN_ON" />
                 <action android:name="android.intent.action.SCREEN_OFF" />
                <action android:name="android.intent.action.LOCKED_BOOT_COMPLETED" />
                 <action android:name="android." />
             </intent-filter>
        </receiver>

Not getting any callback on naught and oreo devices,tried on marshmallow devices its working fine .but on oreo devices its not working and also for battery connected and network change receiver not working .

Answer 1

您无法在 manifest.xml 中从 Oreo 注册广播接收器。 你可以看到 Android 8.0 行为变化

Apps cannot use their manifests to register for most implicit broadcasts (that is, broadcasts that are not targeted specifically at the app).

解决方案

改为在相关 Activity 中注册您的接收器。像这样。

public class MainActivity extends AppCompatActivity {
    BroadcastReceiver receiver;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_SCREEN_ON);
        filter.addAction("android.intent.action.LOCKED_BOOT_COMPLETED");
        receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                // todo
            }
        };
        registerReceiver(receiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (receiver != null)
            unregisterReceiver(receiver);
    }
}

如果找不到相关的常量字符串，您可以将操作添加为与清单相同的字符串。