在代码中修改TextView的DrawableRight图片

TextView的xml

1. <TextView  
2.                 android:id="@+id/textciew1"  
3.                 android:layout_width="match_parent"  
4.                 android:layout_height="wrap_content"  
5.                 android:background="#000"  
6.                 android:drawableRight="@drawable/button_nav_down"  
7.                 android:gravity="center_vertical"  
8.                 android:paddingLeft="16dp"  
9.                 android:paddingRight="16dp"  
10.                 android:text="展开"  
11.                 android:textColor="#fff"  
12.                  />  

在代码中若是要修改drawableRight设置的图片能够使用

setCompoundDrawables(Drawable left,Drawable top,Drawable right,Drawable bottom)

Drawable能够经过 Drawable nav_up=getResources().getDrawable(R.drawable.button_nav_up);获得

可是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，因而咱们加一行代码就能够了

1. nav_up.setBounds(0, 0, nav_up.getMinimumWidth(), nav_up.getMinimumHeight());  

代码合在一块儿是这样的：

1. Drawable nav_up=getResources().getDrawable(R.drawable.button_nav_up);  
2. nav_up.setBounds(0, 0, nav_up.getMinimumWidth(), nav_up.getMinimumHeight());  
3. textview1.setCompoundDrawables(null, null, nav_up, null);