Hello,
I have found some weird behaviour which might be a bug. I found it
while developing a quite large application but I've been able to
reproduce the behaviour in a minimal approach so that I can provide
source code.
I have a service that is constantly running and at certain times it
pops up an activity with Theme.Dialog as theme for the user.
Everything works fine if the main activity of the program has been
destroyed (via back button) or if the main activity is currently
running.
However, if the main activity of the app has been created and then
minimized (e.g. via Home button), the main activity shows up. It is
not possible to click the buttons of the main activity because it
seems to be hidden behind an invisible dialog activity. It is possible
to click the buttons of the dialog if you know where they are and if
you click the back button, you can see the dialog flashing by as it
disappears and it is then possible to click the main activity buttons.
I've tested this on HTC Desire 2.2, HTC Wildfire 2.1, HTC Legend 2.1,
Sony x10 mini pro 2.1 and on emulators 2.1 and 2.2. The behaviour
described happens on all 2.1 devices and emulator but not on emulator
2.2 nor on the Desire with 2.2.
Source code is provided below. There are 2 buttons in the main
activity, the first, called "Finish" asks the service to popup the
dialog in 3 seconds and then finishes the main activity. This button
is for illustrative purposes only, it works fine. The second button,
called "Post later" just asks the service to popup the dialog in 3
seconds. If the second button is clicked and before the 3 seconds have
passed, the home button is clicked, the bug appears.
Source code:
Main.java:
--------------------------------------------------------------
package com.myapp.DialogBugTest;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
public class Main extends Activity
{
private Handler handler = new Handler();
private final Runnable runnable = new Runnable()
{
public void run()
{
DialogBugTestService.getInstance().showDialog();
}
};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startService(new Intent(this, DialogBugTestService.class));
}
public void onFinishButton(View aView)
{
handler.postDelayed(runnable, 3000);
finish();
}
public void onLaterButton(View aView)
{
handler.postDelayed(runnable, 3000);
}
}
--------------------------------------------------------------
main.xml:
--------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/finish_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Finish"
android:onClick="onFinishButton"
/>
<Button
android:id="@+id/later_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Post later"
android:onClick="onLaterButton"
/>
</LinearLayout>
--------------------------------------------------------------
DialogBugTestService.java:
--------------------------------------------------------------
package com.myapp.DialogBugTest;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class DialogBugTestService extends Service
{
private static DialogBugTestService instance = null;
@Override
public void onCreate()
{
super.onCreate();
instance = this;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
return START_STICKY;
}
public static DialogBugTestService getInstance()
{
if (instance == null)
{
Log.e("service", "instance is null!");
}
return instance;
}
public void showDialog()
{
Intent intent = new Intent(this, DialogBugDialog.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
@Override
public IBinder onBind(Intent arg0)
{
return null;
}
}
--------------------------------------------------------------
DialogBugDialog.java:
--------------------------------------------------------------
package com.optimobile.DialogBugTest;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
public class DialogBugDialog extends Activity
{
@Override
protected void onCreate(Bundle aSavedInstanceState)
{
super.onCreate(aSavedInstanceState);
setContentView(R.layout.dialog);
}
public void onOk(View aView)
{
finish();
}
}
--------------------------------------------------------------
dialog.xml:
--------------------------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/ok_button"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="OK"
android:onClick="onOk"
/>
</LinearLayout>
--------------------------------------------------------------
I've also tried this without the Theme.Dialog as theme and it then
works fine. I also tried it with custom styles and the bug seems to
appear whenever windowIsFloating is set to true.
Is this a known bug? Are there any workarounds? I really need this
functionality in my app and doing it without a floating window looks
really ugly.
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