Android Alert Dialog Background Issue API 11+

问题

I create a AlertDialog with the code below. For some reason I'm getting an extra background (see pic) on Honeycomb and above. The code crashes fine for anything below honeycomb. MyCustomDialog is simply Theme.Dialog for < API-11 and Theme.Holo.Dialog for API-11 and up.

Any idea why I'm getting the extra background?
Any idea why it crashes for API < 11? It works fine if I remove the Theme.

Update figured out the answer to Question #2. Seems the constructor AlertDialog.Builder(Context context, int theme) was introduced in API 11. My fix was simply to change the line to:

final AlertDialog.Builder builder = (Integer.parseInt(android.os.Build.VERSION.SDK) < 11)? new AlertDialog.Builder(this) : new AlertDialog.Builder(this,R.style.JumpDialog);

I still need help with Question #1

private Dialog setupKeyBoardDialog() {
    if (mContact.getLocaleId() != -1) {
        final AlertDialog.Builder builder = new AlertDialog.Builder(this,R.style.MyCustomDialog);
        builder.setTitle("Keyboards");

        mKeyboardLayouts = new KeyboardLayoutGroup();
        mKeyboardLayouts.layoutNames = new CharSequence[(int) jni.getNumKeyLayouts()];
        mKeyboardLayouts.layoutValue = new ArrayList<Integer>();

        for (int i = 0; i < jni.getNumKeyLayouts(); i++) {
            mKeyboardLayouts.layoutNames[i] = jni.LayoutInfoForIndex(i).getName();
            mKeyboardLayouts.layoutValue.add(i, (int) jni.LayoutInfoForIndex(i).getLocale_id());
        }

        final int selectedItem = mKeyboardLayouts.layoutValue.indexOf(mContact.getLocaleId());

        builder.setSingleChoiceItems(mKeyboardLayouts.layoutNames, selectedItem, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                mContact.setLocaleId(mKeyboardLayouts.layoutValue.get(item));
                mContactsDB.saveContact(mContact, true);

                dialog.dismiss();
                initializeSettingsList();
            }
        });

        final AlertDialog dialog = builder.create();
        dialog.setButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogBox, int arg1) {
                dialogBox.cancel();
            }
        });

        return dialog;
    }

    return null;
}

回答1:

Figured out the answers

AlertDialog has it's on static constants for each theme in the AlertDialog class and it does not take the standard theme. when I replaced R.style.MyTheme or android.R.style.Theme_Holo_Dialog with AlertDialog.THEME_HOLO_LIGHT the code worked just fine.

Seems the constructor AlertDialog.Builder(Context context, int theme) was introduced in API 11. My fix was simply to change the line to:

final AlertDialog.Builder builder;
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
    builder = new AlertDialog.Builder(this);
} else {
    builder = new AlertDialog.Builder(this,R.style.JumpDialog);
}

回答2:

You can try to use new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.JumpDialog)) instead of new AlertDialog.Builder(this, R.style.JumpDialog)

回答3:

For those looking for a way to customize the dialog theme without having to stick with the default ones (as in the accepted solution), starting with Lollipop it seems that the extra background has been finally removed. So, now you can create a theme inheriting from the default one (example with AppCompat):

<!-- default theme for L devices -->
<style name="SelectionDialog" parent="Theme.AppCompat.Light.Dialog">
    <item name="android:textColor">@color/default_text_color_holo_light</item>
</style>
<!-- theme for Pre-L devices -->
<style name="SelectionDialog.PreL">
    <!-- remove the dialog window background -->
    <item name="android:windowBackground">@color/transparent</item>
</style>

And instantiate your builder with this code:

AlertDialog.Builder builder = new AlertDialog.Builder(
            getActivity(),                
            Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT ?
                    R.style.SelectionDialog :
                    R.style.SelectionDialog_PreL);

Of course this could also be done with resource folders (values/ and values-v21/).

来源：https://stackoverflow.com/questions/8685351/android-alert-dialog-background-issue-api-11

标签

java

android

android-theme

android-dialog