Question

我的应用中有两项活动：

A - 登录活动

B - 主要活动

当用户点击活动A中的登录按钮时，我正在启动服务。在服务的onCreate（）方法中，我像这样启动活动B：

 Intent notificationIntent = new Intent(this, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

    NotificationCompat.Builder builder = new NotificationCompat
            .Builder(getApplicationContext());
    builder.setContentIntent(pendingIntent);
    builder.setContentTitle("Activity B in foreground service");
    builder.setSmallIcon(R.drawable.ic_launcher);

    startForeground(1, builder.build());

问题在于活动B的启动最小化。我必须按通知栏中的服务按钮才能使我的活动最大化（填满屏幕）。我怎样才能以正常方式从服务中启动Activity B-而不是最小化它（放到后台）？

Answer 1

您的代码根本不会实际启动活动B.它只需创建一个Notification，如果用户选择，将启动活动B.

如果您想实际启动活动B，请执行以下操作：

    Intent notificationIntent = new Intent(this, MainActivity.class);
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    // Now launch the activity immediately
    startActivity(notificationIntent);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
    NotificationCompat.Builder builder = new NotificationCompat
        .Builder(getApplicationContext());
    ... (rest of your code here)

Answer 2

问题已在android start activity from service

中得到解答

public void sendMessage(View view) {
    Intent intent = new Intent(this, DisplayMessageActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}

http://developer.android.com/training/basics/firstapp/starting-activity.html

Answer 3

最后我找到了解决方案：

服务类中的onCreate（）方法：

@Override
public void onCreate() {

    Intent notificationIntent = new Intent(getBaseContext(), MainActivity.class);
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
    getApplication().startActivity(notificationIntent);

    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

    NotificationCompat.Builder builder = new NotificationCompat
            .Builder(getApplicationContext());
    builder.setContentIntent(pendingIntent);
    builder.setContentTitle("Activity B runs in a foreground service");
    builder.setSmallIcon(R.drawable.ic_launcher);

    startForeground(1, builder.build());

}

在AndroidManifest.xml中，在Activity元素中添加以下行：

android:launchMode="singleTop"

从前台服务启动时，活动最小化

3 个答案: