Question

我正试图通过短信打开和关闭屏幕。这是我下面的代码，我不知道出了什么问题，因为它根本不起作用。帮助我找到错误。我也附上清单文件。提前谢谢你。我的java文件：

public class MyReceiver extends BroadcastReceiver{

String sender;
@Override
public void onReceive(Context context, Intent intent) {

    SmsMessage[] sms = null;

    Bundle b = intent.getExtras();

    String str = " SMS From : ";
    if (b != null) {

        Object[] pdus = (Object[]) b.get("pdus");

        sms = new SmsMessage[pdus.length];

        for (int i = 0; i < sms.length; i++) {

            sms[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);

            if (i == 0) {
                str +=  sms[i].getOriginatingAddress();
                str += ":"+sms[i].getMessageBody().toString();          

                }else if (sms[i].getMessageBody().equals("D")) {
                    Intent in2= new Intent(Intent.ACTION_SCREEN_OFF);
                    in2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    context.startActivity(in2);

                }else if (sms[i].getMessageBody().equals("E")) {
                    Intent in3= new Intent(Intent.ACTION_SCREEN_ON);
                    in3.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    context.startActivity(in3);

            }
        }
    }
        Toast.makeText(context, str, Toast.LENGTH_SHORT).show();
        Log.d("Receiving", str);
    }

}
 }

我的清单文件：

<uses-permission android:name="android.permission.RECEIVE_SMS"/>

    <receiver android:name=".MyReceiver">
        <intent-filter android:priority="100">
            <action android:name="android.provider.Telephony.SMS_RECEIVED"/>
            <action android:name="android.intent.action.SCREEN_OFF"/>
            <action android:name="android.intent.action.SCREEN_ON"/>
            </intent-filter>

            </receiver>
</application>

Answer 1

好的，首先，关于接收短信，您可能希望看到我对此的回答：communication between two device using sms

这是我找到的最可靠的接收短信的方式。

请注意，如果您不希望该消息显示在设备Hide sms notifications with a broadcastreceiver in KitKat

上，则SMS可能不是KitKat以上新设备的最佳选择

您可能需要考虑切换到来自互联网的推送通知。这可以使用例如parse.com

轻松完成

关于开启和关闭屏幕，我使用以下代码。

private PowerManager.WakeLock wl;
private PowerManager pm;

public void screenWakeup(Context context, Activity activity) {

    try {
        pm = (PowerManager) context
                .getSystemService(Activity.POWER_SERVICE);
        // if (!pm.isScreenOn()) {
        if (wl == null) {
            wl = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP
                    | PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "Turios");
        }
        if (!wl.isHeld()) {
            wl.acquire();
        }

        final Window win = activity.getWindow();
        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
        win.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        // }

    } catch (Exception ex) {
        Log.e(TAG, ex.getMessage());
    }

}

public void screenRelease(Activity activity) {

    if (releaseWakeLock()) {
        activity.getWindow().clearFlags(
                WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                        | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                        | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                        | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    }

}

请注意，它需要访问某个活动，因此除非您的活动处于活动状态，否则它将无法运行。我建议做的是：

接收打开/关闭消息
发送新广告，例如sendBroadcast(new Intent("INTENT_TURN_SCREEN_ON_OFF"))

在活动中注册广播的监听器

// in onCreate
wakeScreenReceiver = new WakeScreenReceiver();
registerReceiver(wakeScreenReceiver, new IntentFilter("INTENT_TURN_SCREEN_ON_OFF"));

// in onDestroy
unregisterReceiver(wakeScreenReceiver);

// WakeScreenReceiver defined somewhere inside the Acitivity
public class WakeScreenReceiver extends BroadcastReceiver {
    private static final String TAG = "WakeScreenReceiver";

    public RefreshModules() {
    }

    @Override
    public void onReceive(Context context, final Intent intent) {
          screenWakeup(MainActivity.this, MainActivity.this);
          // or 
          screenRelease(MainActivity.this);
    }
}

这样，如果活动处于活动状态，应用程序将只会尝试打开/关闭屏幕，否则将无法接收广播。

通过短信收到屏幕开启和关闭

1 个答案: