android自定义带清空内容的TextView

/**
 * 带删除按钮的EditText
 * @author Administrator
 *
 */
public class ClearEditText extends EditText implements OnFocusChangeListener, TextWatcher {

/**
 * 删除按钮的引用
 */
private Drawable mClearDrawable;

public ClearEditText(Context context) {
this(context, null);
}

public ClearEditText(Context context, AttributeSet attrs) {
// 这里构造方法也很重要，不加这个很多属性不能再XML里面定义
this(context, attrs, android.R.attr.editTextStyle);
}

public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}

private void init() {
// 获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
mClearDrawable = getCompoundDrawables()[2];
if (mClearDrawable == null) {
mClearDrawable = getResources().getDrawable(R.drawable.common_input_box_clear);
}
mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
setClearIconVisible(false);
setOnFocusChangeListener(this);
addTextChangedListener(this);
}

/**
 * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件 当我们按下的位置 在 EditText的宽度 -
 * 图标到控件右边的间距 - 图标的宽度 和 EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑
 */
@Override
public boolean onTouchEvent(MotionEvent event) {
if (getCompoundDrawables()[2] != null) {
if (event.getAction() == MotionEvent.ACTION_UP) {
boolean touchable = event.getX() > (getWidth() - getPaddingRight() - mClearDrawable.getIntrinsicWidth())
&& (event.getX() <((getWidth() - getPaddingRight())));
if (touchable) {
this.setText("");
}
}
}

return super.onTouchEvent(event);
}

/**
 * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
 * 
 * @param v
 * @param hasFocus
 *            The new focus state of v
 */
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
setClearIconVisible(getText().length() > 0);
} else {
setClearIconVisible(false);
}
}

/**
 * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
 * 
 * @param visible
 */
protected void setClearIconVisible(boolean visible) {
Drawable right = visible ? mClearDrawable : null;
setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
}

/**
 * 当输入框里面内容发生变化的时候回调的方法
 */
@Override
public void onTextChanged(CharSequence s, int start, int count, int after) {
setClearIconVisible(s.length() > 0);
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}

@Override
public void afterTextChanged(Editable s) {

}

/**
 * 设置晃动动画
 */
public void setShakeAnimation() {
this.setAnimation(shakeAnimation(5));
}

/**
 * 晃动动画
 * 
 * @param counts
 *            1秒钟晃动多少下
 * @return
 */
public static Animation shakeAnimation(int counts) {
Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
translateAnimation.setInterpolator(new CycleInterpolator(counts));
translateAnimation.setDuration(1000);
return translateAnimation;
}

}