相关疑难解决方法(0)

在我看过的各种Android代码中:

 public class MyActivity extends Activity {
    public void method() {
       mContext = this;    // since Activity extends Context
       mContext = getApplicationContext();
       mContext = getBaseContext();
    }
 }

但是,我找不到任何合适的解释,哪些更好,以及在什么情况下应该使用.

关于这方面的文件的指示,以及关于如果选择了错误的可能会破坏的指导,将不胜感激.

在我的中Service,我使用以下代码在正常运行时打开通知:

private final static NOTIFICATION_ID = 412434;
private void startNotification() {
    NotificationCompat.Builder builder = new NotificationCompat.Builder(
            this);
    builder.setSmallIcon(R.drawable.notification);
    builder.setContentTitle("Running");

    final Intent intent = new Intent(this, MainActivity.class);
    intent.setAction(Intent.ACTION_VIEW);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    final PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
            intent, PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(contentIntent);
    builder.setOngoing(true);
    builder.setAutoCancel(false);

    notification = builder.build();

    startForeground(NOTIFICATION_ID, notification);
}

该PendingIntent是打开MainActivity时,通知被窃听.这在我的所有测试设备上运行得非常好,使用Android 2.3.3,2.3.5和Android 4.1.

它不起作用,但是在我的Nexus 7(Android 4.3)上,这根本不起作用.点击通知时没有任何反应.

我错过了这些放在一起的方式有什么变化吗？

我已经创建了一个管理短信的应用程序,我已经创建了通知,但是当我点击它们时它启动了另一个活动,我想知道如何检查一个活动是否已经停止并恢复它.

以下是用于创建pendingintent的代码:

private void createNotification(SmsMessage sms, Context context){

    final NotificationManager nm = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);

    String contentTitle = "";


    // construct the Notification object.
        final NotificationCompat.Builder  builder = new NotificationCompat.Builder(context)
        .setContentTitle(contentTitle)
         .setContentText(sms.getMessageBody())
         .setSmallIcon(R.drawable.ic_launcher)
         .setLargeIcon(getIconBitmap())
         .setNumber(nmessages);

        builder.setAutoCancel(true);

        //(R.drawable.stat_sample, tickerText,
          //      System.currentTimeMillis());

        // Set the info for the views that show in the notification panel.
        //notif.setLatestEventInfo(this, from, message, contentIntent);
        /*
        // On tablets, the ticker shows the sender, the first line of the message,
        // the photo of the person and the app icon. …