Please forgive my ignorance, this is my first week on the job as an Android developer. While I have a few years of Java under my belt, I'm a complete noob in the Android world.
I'm simply trying to create a dialog and display it. From research, I found this was the preferred method:
https://developer.android.com/guide/topics/ui/dialogs.html
So, I went down that road and slapped a basic example together, and I get an exception when running:
09-11 11:57:28.914: E/AndroidRuntime(1217): FATAL EXCEPTION: main 09-11 11:57:28.914: E/AndroidRuntime(1217): Process: com.myapp.mobile, PID: 1217 09-11 11:57:28.914: E/AndroidRuntime(1217): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp.mobile/com.myapp.mobile.MainActivity}: java.lang.IllegalStateException: Activity has been destroyed 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.ActivityThread.access$800(ActivityThread.java:135) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.os.Handler.dispatchMessage(Handler.java:102) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.os.Looper.loop(Looper.java:136) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.ActivityThread.main(ActivityThread.java:5017) 09-11 11:57:28.914: E/AndroidRuntime(1217): at java.lang.reflect.Method.invokeNative(Native Method) 09-11 11:57:28.914: E/AndroidRuntime(1217): at java.lang.reflect.Method.invoke(Method.java:515) 09-11 11:57:28.914: E/AndroidRuntime(1217): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 09-11 11:57:28.914: E/AndroidRuntime(1217): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 09-11 11:57:28.914: E/AndroidRuntime(1217): at dalvik.system.NativeStart.main(Native Method) 09-11 11:57:28.914: E/AndroidRuntime(1217): Caused by: java.lang.IllegalStateException: Activity has been destroyed 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1345) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.BackStackRecord.commitInternal(BackStackRecord.java:597) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.BackStackRecord.commit(BackStackRecord.java:575) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.DialogFragment.show(DialogFragment.java:230) 09-11 11:57:28.914: E/AndroidRuntime(1217): at com.myapp.mobile.dialog.ActivationDialog.show(ActivationDialog.java:25) 09-11 11:57:28.914: E/AndroidRuntime(1217): at com.myapp.mobile.activate.Activation.ActivationCheck(Activation.java:11) 09-11 11:57:28.914: E/AndroidRuntime(1217): at com.myapp.mobile.MainActivity.onCreate(MainActivity.java:20) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.Activity.performCreate(Activity.java:5231) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 09-11 11:57:28.914: E/AndroidRuntime(1217): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 09-11 11:57:28.914: E/AndroidRuntime(1217): ... 11 more
The call from MainActivity:
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//check user activation
ActivationDialog dialog = new ActivationDialog();
dialog.show();
}
ActivationDialog class:
public class ActivationDialog extends FragmentActivity implements BaseDialogFragment.BaseDialogListener
{
public ActivationDialog()
{
}
@Override
public void onDialogPositiveClick(DialogFragment dialog)
{
}
@Override
public void onDialogNegativeClick(DialogFragment dialog)
{
}
public void show()
{
BaseDialogFragment dialogFrag = new BaseDialogFragment();
dialogFrag.show(this.getFragmentManager(), "activationDialog");
}
}
Base class:
public class BaseDialogFragment extends DialogFragment
{
public interface BaseDialogListener
{
public void onDialogPositiveClick(DialogFragment dialog);
public void onDialogNegativeClick(DialogFragment dialog);
}
BaseDialogListener dialogListener;
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
try
{
dialogListener = (BaseDialogListener)activity;
}
catch (ClassCastException e)
{
throw new ClassCastException(activity.toString() + " must implement NoticeDialogListener");
}
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage(R.string.dialog_base_message).setPositiveButton(R.string.dialog_base_ok, new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
}
}).setNegativeButton(R.string.dialog_base_cancel, new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
}
});
return builder.create();
}
}
I found a better way through trial and error, and fishing through examples. I think. I don't know if there's a drawback to doing it this way but here's what worked. I'm now going to try and add controls and events to it, but this answers my original question.
Custom DialogFragment:
public class MyDialogFragment extends DialogFragment
{
@Override
public Dialog onCreateDialog(Bundle savedInstanceState)
{
return new AlertDialog.Builder(getActivity())
.setTitle("Dialog Title")
.setPositiveButton("OK", null)
.create();
}
}
Showing the Dialog:
public class MainActivity extends ActionBarActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MyDialogFragment myDiag = new MyDialogFragment();
myDiag.show(getFragmentManager(), "Diag");
}
}