使警报对话框背景透明

Question

我正在Android Jelly Beans OS上创建一个警告对话框.一切都运作良好,但我想要的是,而不是警报对话框的黑色背景,我想要一个透明的背景.我在stackoverflow上阅读了很多文章和用户的问题,但没有一个能帮助我.

这是我的代码:

AlertDialog.Builder builder =  new AlertDialog.Builder(this, R.style.CustomAlertDialog);
    builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog1, int which) {
            gActivityResult = REQUEST_PICK_CONTACT;
            onResume();
            return;
        } }); 
    builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog1, int which) {
            return;
        } }); 
    View view = getLayoutInflater().inflate(R.layout.alert_dialog, null);
    builder.setTitle(R.string.gender_age);
    builder.setInverseBackgroundForced(false);
    builder.setView (view);


    dialog = builder.create ();

这是我的CustomAlertDialog,它在res/values/styles.xml中定义

<style name="CustomAlertDialog" parent="@android:style/Theme.Dialog">
    <!-- All customizations that are NOT specific to a particular API-level can go here. -->
    <item name="android:windowFrame">@null</item>
    <item name="android:windowIsFloating">true</item> 
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
    <item name="android:windowBackground">@color/transparent_color</item>
    <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
    <item name="android:gravity">left</item>
</style>

这是color.xml

<resources>
   <color name="transparent_color">#00000000</color>
</resources>

但它没有帮助我.

我的问题:这可行吗？如果是的话,请你指导我正确的方向吗？

Answer 1

我发现这种方式与AlertDialog.Builder兼容.使用Eclipse中Android"Devices"选项卡中的"转储视图层次结构"按钮,我看到了许多嵌套的FrameLayouts,看起来背景就是这些,与窗口相比.

遍历这些视图并将背景设置为透明的每个实际工作(我的自定义视图然后浮动在昏暗的应用程序上,没有框架或背景,并且布局没有变化).我有一个自定义视图,因此从它遍历,但从窗口遍历ViewGroups也应该工作.

我在自己的DialogFragment子类中使用AlertDialog.Builder并使用自定义视图.

   @Override
   public Dialog onCreateDialog(Bundle savedInstanceState) {
    final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    configureDialogBuilder(builder);

    final LayoutInflater inflater = getActivity().getLayoutInflater();
    customView = inflater.inflate(customViewId, null);
    builder.setView(customView);

    final AlertDialog dialog = builder.create();
    return dialog;
  }

  @Override
  public void onStart() {
    super.onStart();
    clearBackgrounds(customView);
  }

  private void clearBackgrounds(View view) {
    while (view != null) {
      view.setBackgroundResource(android.graphics.Color.TRANSPARENT);

      final ViewParent parent = view.getParent();
      if (parent instanceof View) {
        view = (View) parent;
      } else {
        view = null;
      }
    }
  }