How to bring a background task to the front below honeycomb?

Question

in my applications root activity, I have a customized tab bar, containing three tabs to switch between three screens implemented using ViewFlipper.

What I now want

Answer 1

This works for me on android versions above and below Honeycomb. The keys are the intent flags

Intent intent = new Intent(context, YourClass.class);//The class you want to show

intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(intent);

Answer 2

In versions honeycomb and up, you can use MoveTaskToFront like so

//Bring Task to front with Android >= Honeycomb
if (Build.VERSION.SDK_INT >= 11) {
    ActivityManager am = (ActivityManager) getSystemService(Activity.ACTIVITY_SERVICE);
    List<RunningTaskInfo> rt = am.getRunningTasks(Integer.MAX_VALUE);

    for (int i = 0; i < rt.size(); i++) 
    {
           // bring to front
           if (rt.get(i).baseActivity.toShortString().indexOf("yourproject") > -1) {                     
              am.moveTaskToFront(rt.get(i).id, ActivityManager.MOVE_TASK_WITH_HOME);
           }
    }
}

Make sure your Project Compiles with Android v.11 or up sothat this line doesn't break with compile:

am.moveTaskToFront(rt.get(i).id, ActivityManager.MOVE_TASK_WITH_HOME);

For older Android versions you can use the following to move the task to the front:

Intent intent = new Intent(this, YourClass.class);//The class you want to show
startActivity(intent);

In the android manifest add the following

<!--The versions with which to compile-->
<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="11"/>

<!--The Activity you wish to bring forward-->
<activity android:name="YourClass" android:taskAffinity="" android:launchMode="singleTask" />

<!--User Permissions-->
<uses-permission android:name="android.permission.GET_TASKS" />
<uses-permission android:name="android.permission.REORDER_TASKS" />

And then lastly, Make sure when you push the task to back by overriding the onBackPressed(), DO NOT USE moveTaskToBack(), It will result in your task not ending up visible to the user. Rather use the following: This will simulate a home button press which will effectively hide your application and show the home screen

@Override
public void onBackPressed() {
    Utils.showToast(this, "Your application is running in the background");
    /*Simulate Home Button Press*/
    Intent startMain = new Intent(Intent.ACTION_MAIN);
    startMain.addCategory(Intent.CATEGORY_HOME);
    startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(startMain);
}

And there you go, I hope this works for you and helps a few people with this problem.