Question

我成功设置了GCM通知，可以通过GCM从服务器端获取消息。

我也可以通过这些代码在android中的通知栏系统上显示通知。

我尝试使用这些方法在锁定屏幕上显示通知但不起作用：

1 - 添加<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />权限

2 - 在manifest.xml

中定义的主要活动中添加android:showOnLockScreen="true"

3 - 添加到java文件中的主Activity： getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

4 - 检查应用程序设置系统中的Show notifications复选框。

知道如何在锁定屏幕上显示通知的人

请帮助我，我做了很多搜索但没有帮助。

谢谢，

p / s：

我正在使用Samsung S3，Android 4.3进行测试。已启用锁定屏幕页面。

我从Intent Service调用show notification方法。

代码显示通知：

// Put the message into a notification and post it.
// This is just one simple example of what you might choose to do with
// a GCM message.
private void sendNotification(String msg) {
    mNotificationManager = (NotificationManager)
            this.getSystemService(Context.NOTIFICATION_SERVICE);

    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
            new Intent(this, Pas.class)
                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                            | Intent.FLAG_ACTIVITY_CLEAR_TASK),
            PendingIntent.FLAG_CANCEL_CURRENT);
    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_play_dark)
                    .setContentTitle("");
    // Set Big View style to see full content of the message
    NotificationCompat.BigTextStyle inboxStyle =
            new NotificationCompat.BigTextStyle();

    inboxStyle.setBuilder(mBuilder);
    inboxStyle.bigText("");
    inboxStyle.setBigContentTitle("");
    inboxStyle.setSummaryText("");

    // Moves the big view style object into the notification object.
    mBuilder.setStyle(inboxStyle);
    mBuilder.setContentText(msg);
    mBuilder.setDefaults(Notification.DEFAULT_ALL);
    mBuilder.setContentIntent(contentIntent);

    mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());
}

我使用这些权限：

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

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />

<uses-permission android:name="android.permission.CAPTURE_AUDIO_OUTPUT" />
<uses-permission android:name="android.permission.MEDIA_CONTENT_CONTROL" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />

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

<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="com.trek2000.android.pas.permission.C2D_MESSAGE" />

<permission
    android:name="com.trek2000.android.pas.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

    <activity
        android:name="com.android.pas.Pas"
        android:showOnLockScreen="true"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <!-- Receiver GCM -->
    <receiver
        android:name = "receiver.GcmBroadcastReceiver"
        android:permission = "com.google.android.c2dm.permission.SEND">
        <intent-filter>
            <action android:name = "com.google.android.c2dm.intent.RECEIVE" />

            <category android:name = "com.trek2000.android.pas" />
        </intent-filter>
    </receiver>

    <!-- Services -->
    <service
        android:name = "service.GcmIntentService"
        android:exported = "true" />

</application>

Answer 1

我设法以这种方式在锁定屏幕上显示通知。

以下是包含评论的完整代码。

// Logic to turn on the screen
PowerManager powerManager = (PowerManager) context.getSystemService(POWER_SERVICE);

if (!powerManager.isInteractive()){ // if screen is not already on, turn it on (get wake_lock for 10 seconds)
    PowerManager.WakeLock wl = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK |PowerManager.ACQUIRE_CAUSES_WAKEUP |PowerManager.ON_AFTER_RELEASE,"MH24_SCREENLOCK");
    wl.acquire(10000);
    PowerManager.WakeLock wl_cpu = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,"MH24_SCREENLOCK");
    wl_cpu.acquire(10000);
}

// Notification stuff

NotificationCompat.Builder builder = new NotificationCompat.Builder(context.getApplicationContext());
builder.setSmallIcon(R.drawable.attendance_icon);
builder.setContentTitle("Attendance not marked");
builder.setContentText("Attendance is not marked for today. Please mark the same.");

TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(context.getApplicationContext());
Intent intent = new Intent(context.getApplicationContext(), ActivityNewRecord.class);
taskStackBuilder.addParentStack(ActivityNewRecord.class);
taskStackBuilder.addNextIntent(intent);

PendingIntent pendingIntent = taskStackBuilder.getPendingIntent(100, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(pendingIntent);
final long[] DEFAULT_VIBRATE_PATTERN = {0, 250, 250, 250};
builder.setVibrate(DEFAULT_VIBRATE_PATTERN);
builder.setLights(Color.WHITE, 2000, 3000);
builder.setSound(Settings.System.DEFAULT_NOTIFICATION_URI);

// This is the answer to OP's question, set the visibility of notification to public.
builder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC); 


NotificationManager notificationManager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(100, builder.build());

但是，在锁定屏幕上显示通知可能对某些设备不起作用。（我在Nexus手机上进行过测试，但它可以正常工作，但在小米设备上无效）

但话又说回来，收到通知后，屏幕会亮起，振动并响铃。

在锁定屏幕上显示通知

1 个答案: