android Button,textView 等控件设置控件内嵌周围图片使用方法
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1：在布局中直接设置：
android:drawableLeft|Right|Top|Bottom
android:drawablePadding="10dp"//图片与控件文字内容距离设置
2：在代码中动态设置：Drawable img_right，img_left,img_top,img_bottom;
a:获取drawable：img_right=getResources().getDrawable(R.drawable.img_right);......
b:设置图片（必须设置，不设置，图片不显示哦！）：
img_right.setBounds(0, 0, img_right.getMinimumWidth(), img_right.getMinimumHeight());c:button.setCompoundDrawables(null,null,img_right,null)；
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