自定义EditText实现可以一键删除输入的内容

public class MyEditText extends EditText {
private Drawable dRight;
private Rect rRounds;

public MyEditText(Context context) {
super(context);
// TODO Auto-generated constructor stub
initEditText();
}

public MyEditText(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
initEditText();
}

public MyEditText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
initEditText();
}

//初始化EditText
private void initEditText(){
setEditTextDrawable();
addTextChangedListener(new TextWatcher() {

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
MyEditText.this.setEditTextDrawable();
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub

}

@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub

}
});

}

//控制图片的显示
private void setEditTextDrawable() {
// TODO Auto-generated method stub
if(getText().toString().length() == 0){
setCompoundDrawables(null, null, null, null);
} else {
setCompoundDrawables(null, null,this.dRight, null);
}
}

@Override
protected void onDetachedFromWindow() {
// TODO Auto-generated method stub
super.onDetachedFromWindow();
this.dRight = null;
this.rRounds = null;
}

//添加触摸事件,点击之后出现清空效果
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub

if((this.dRight != null) && (event.getAction() == 1)){
this.rRounds = this.dRight.getBounds();
int i = (int)event.getRawX();
if(i>getRight() - 4 * this.rRounds.width()){
setText("");
event.setAction(MotionEvent.ACTION_CANCEL);
}
}

return super.onTouchEvent(event);
}

//显示右侧删除图标
@Override
public void setCompoundDrawables(Drawable left, Drawable top,
Drawable right, Drawable bottom) {
// TODO Auto-generated method stub
if(right != null){
this.dRight = right;
}
super.setCompoundDrawables(left, top, right, bottom);
}
}