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我试图使不确定的 Drawable 的背景透明,但它总是以灰色背景出现。

我在谷歌搜索了很多,但我找不到任何有用的答案。

这是我的代码:

活动代码:

    dialogo = new Dialog(this, R.style.Dialog);
    dialogo.getWindow().setBackgroundDrawable(new ColorDrawable(0));

    dialogo.setContentView(R.layout.dialog_progress);
    ProgressBar bar = (ProgressBar) dialogo.findViewById(R.id.imgProgreso);
    bar.setBackgroundColor(0x00000000);
    bar.setDrawingCacheBackgroundColor(0x00000000);
    bar.setBackgroundDrawable(null);
    dialogo.setTitle("Procesando...");

    TextView text = (TextView) dialogo
            .findViewById(R.id.txtmensajedialogprogress);
    text.setText("");

    dialogo.show();

dialog_progress.xml:(ProgressBar 和 TextView 在 LinearLayout 内,但这里不喜欢显示):

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="match_parent"
     android:background="@android:color/transparent"
     android:gravity="center"
     android:orientation="vertical" >
    <ProgressBar
      android:id="@+id/imgProgreso"
      android:layout_width="32dp"
      android:layout_height="32dp"
      android:layout_margin="5dip"
      android:background="@android:color/transparent"
      android:indeterminateDrawable="@drawable/waiting" />

    <TextView
      android:id="@+id/txtmensajedialogprogress"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="center_horizontal|center_vertical"
      android:background="@android:color/transparent"
      android:gravity="center_vertical|center_horizontal"
      android:text="Procesando la solicitud"
      android:textColor="@android:color/black"
      android:textSize="15dp"
      android:textStyle="normal" />
</LinearLayout>

动画列表(waiting.xml):

<?xml version="1.0" encoding="utf-8"?>
    <animation-list xmlns:android="http://schemas.android.com/apk/res/android"
      android:id="@+id/selected"
      android:oneshot="false" >
       <item android:drawable="@drawable/big_load00000" android:duration="50" />
           <item android:drawable="@drawable/big_load00001" android:duration="50" />
           <item android:drawable="@drawable/big_load00002" android:duration="50" />
           <item android:drawable="@drawable/big_load00003" android:duration="50" />
           <item android:drawable="@drawable/big_load00004" android:duration="50" />
           <item android:drawable="@drawable/big_load00005" android:duration="50" />
           <item android:drawable="@drawable/big_load00006" android:duration="50" />
           <item android:drawable="@drawable/big_load00007" android:duration="50" />
           <item android:drawable="@drawable/big_load00008" android:duration="50" />
           <item android:drawable="@drawable/big_load00009" android:duration="50" />
           <item android:drawable="@drawable/big_load00010" android:duration="50" />
           <item android:drawable="@drawable/big_load00011" android:duration="50" />
    </animation-list>

谢谢您的帮助。

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