Android如何在位图xml中设置不透明度-Androidhowtosetopacityinbitmapxml

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If you’re displaying the Bitmap in an ImageView, you can probably use the ImageView.setAlpha(int) method. However, if the ImageView is accesed via RemoteViews, as is the case when updating a widget, you won’t be able to invoke this method (if you try to call it via RemoteViews.setInt(int, String, int) you’ll get an exception telling you as much).

如果您在ImageView中显示位图,则可以使用ImageView.setAlpha(int)方法。但是,如果通过RemoteViews加入ImageView,就像更新窗口小部件一样,您将无法调用此方法(如果您尝试通过RemoteViews.setInt(int,String,int)调用它)得到一个例外告诉你的事情)。

 private Bitmap adjustOpacity(Bitmap bitmap, int opacity)
    {
        Bitmap mutableBitmap = bitmap.isMutable()
                               ? bitmap
                               : bitmap.copy(Bitmap.Config.ARGB_8888, true);
        Canvas canvas = new Canvas(mutableBitmap);
        int colour = (opacity & 0xFF) <<24;
        canvas.drawColor(colour, PorterDuff.Mode.DST_IN);
        return mutableBitmap;
    }

More info. and most common just like you problem. How to Set Opacity (Alpha) for View in Android

更多信息。和你一样最常见的问题。如何在Android中为View设置不透明度(Alpha)

Documentation of Bitmap from developer.android.com.

developer.android.com中的位图文档。