我解决了它……创建了以下代码

public class CustomEditText extends EditText {

private Drawable dRight;

private Rect rBounds;

CustomEditText(Context context,AttributeSet attributeSet){

super(context,attributeSet);

}

@Override

public void setCompoundDrawables(Drawable left,Drawable top,Drawable right,Drawable bottom) {

/*if (left != null) {

dLeft = left;

}*/

if (right != null) {

dRight = right;

}

super.setCompoundDrawables(left,top,right,bottom);

}

@Override

public void addTextChangedListener(TextWatcher watcher) {

super.addTextChangedListener(watcher);

}

@Override

protected void onTextChanged(CharSequence text,int start,int lengthBefore,int lengthAfter) {

super.onTextChanged(text,start,lengthBefore,lengthAfter);

if(this.getText().toString().length()>0)

this.setCompoundDrawablesWithIntrinsicBounds(null,dRight,null);

else

this.setCompoundDrawablesWithIntrinsicBounds(null,null);

}

@Override

protected void finalize() throws Throwable {

dRight = null;

rBounds = null;

super.finalize();

}

}

并添加到xml中：

android:id="@+id/uIDEditText"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:drawableRight="@drawable/round_clear"

android:textColor="#ffffff" />

在Activity中(edittext ontouch侦听器)：

uIDEditText.setOnTouchListener(new OnTouchListener() {

@Override

public boolean onTouch(View v,MotionEvent event) {

if (event.getAction() != MotionEvent.ACTION_UP)

return false;

if (event.getX() > uIDEditText.getWidth() - clear.getIntrinsicWidth())

{

uIDEditText.setText("");

event.setAction(MotionEvent.ACTION_CANCEL);

}

return false;

}

});