TextView的xml
[html]view plaincopy
android:id="@+id/textciew1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#000"
android:drawableRight="@drawable/button_nav_down"
android:gravity="center_vertical"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:text="展开"
android:textColor="#fff"
/>
在代码中如果要修改drawableRight设置的图片可以使用
setCompoundDrawables(Drawableleft,Drawabletop,Drawableright,Drawablebottom)
Drawable可以通过 Drawable nav_up=getResources().getDrawable(R.drawable.button_nav_up);得到
但是API提示，setCompoundDrawables()调用的时候，Drawable对象必须调用setBounds(int left, int top, int right, int bottom)方法，于是我们加一行代码就可以了
[java]view plaincopy
nav_up.setBounds(0,0, nav_up.getMinimumWidth(), nav_up.getMinimumHeight());
代码合在一起是这样的：
[java]view plaincopy
Drawable nav_up=getResources().getDrawable(R.drawable.button_nav_up);
nav_up.setBounds(0,0, nav_up.getMinimumWidth(), nav_up.getMinimumHeight());
textview1.setCompoundDrawables(null,null, nav_up,null);
