代码中设置Drawable时，按屏幕Density等比例缩放

SetDrawableWithDensity.java

bd = new BitmapDrawable(tmpInfo.bitmap);

try {
  Method m = BitmapDrawable.class.getMethod(
      "setTargetDensity",
      new Class[] { DisplayMetrics.class });
  m.invoke(bd, GlobalInfo.currentActivity.getResources()
      .getDisplayMetrics());
} catch (NoSuchMethodException e) {
  e.printStackTrace();
} catch (IllegalArgumentException e) {
  e.printStackTrace();
} catch (IllegalAccessException e) {
  e.printStackTrace();
} catch (InvocationTargetException e) {
  e.printStackTrace();
}

view.setBackgroundDrawable(bd);