I am implementing a custom dialog to form an about screen with a simple look and feel (which may become more complex once I get it working). I have a xml layout that loads some text and an icon from R. However when ever showDialog(int) is called I get a force close.
I followed the instructions as per the dev guide: http://developer.android.com/intl/de/guide/topics/ui/dialogs.html
code is as follows:
@Override
protected Dialog onCreateDialog(int id) {
Dialog dialog;
switch(id) {
case DIAG_ABOUT:
dialog = new Dialog(getApplicationContext());
dialog.setContentView(R.layout.aboutdialog);
dialog.setTitle(R.string.about_title);
dialog.setOwnerActivity(this);
break;
default:
dialog = null;
}
return dialog;
}
DIAG_ABOUT is defined as private static final int DIAG_ABOUT = 0;
The Log cat shows the following trace:
03-04 11:37:08.760: ERROR/AndroidRuntime(726): Uncaught handler: thread main exiting due to uncaught exception
03-04 11:37:08.780: ERROR/AndroidRuntime(726): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.ViewRoot.setView(ViewRoot.java:429)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:178)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.app.Dialog.show(Dialog.java:231)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.app.Activity.showDialog(Activity.java:2407)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at uk.me.cpearson.runningLate.Home.onOptionsItemSelected(Home.java:143)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.app.Activity.onMenuItemSelected(Activity.java:2085)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:820)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:139)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:813)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.view.menu.IconMenuView.invokeItem(IconMenuView.java:519)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.view.menu.IconMenuItemView.performClick(IconMenuItemView.java:122)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.View.onTouchEvent(View.java:3828)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.widget.TextView.onTouchEvent(TextView.java:6291)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.View.dispatchTouchEvent(View.java:3368)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1691)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.view.ViewRoot.handleMessage(ViewRoot.java:1525)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.os.Handler.dispatchMessage(Handler.java:99)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.os.Looper.loop(Looper.java:123)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at android.app.ActivityThread.main(ActivityThread.java:3948)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at java.lang.reflect.Method.invokeNative(Native Method)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at java.lang.reflect.Method.invoke(Method.java:521)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540)
03-04 11:37:08.780: ERROR/AndroidRuntime(726): at dalvik.system.NativeStart.main(Native Method)
Can some one point out where I have gone wrong, I am using SDK 1.5
You need to use your Activty
as the Context
for the Dialog
not the Application
.
Android is looking for a view to display the Dialog in and the Application
does not have one but your Activity
will. The Application
is an object which ties your app together and has a Context
as it knows about which locale you're running in and so on, but it relies on Activities to display things to the user.
Replace:
dialog = new Dialog(getApplicationContext());
with:
dialog = new Dialog(this);
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