import android.content.Context;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;
import java.util.jar.Attributes;
/**
* Created by Cheng Bao on 2015/6/17.
*/
public class ClearEditText extends EditText implements View.OnFocusChangeListener, TextWatcher {
/**
* 删除按钮的引用
*/
private Drawable mClearDrawable;
private Context context;
/**
* 控件是否有焦点
*/
private boolean hasFocus;
public ClearEditText(Context context) {
this(context, null);
// super(context);
// this.context = context;
// init();
}
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.mipmap.ic_launcher);
}
mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
//默认设置隐藏图标
setClearIconVisible(false);
//设置焦点改变的监听
setOnFocusChangeListener(this);
//设置输入框里面内容发生改变的监听
addTextChangedListener(this);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mClearDrawable != null && event.getAction() == MotionEvent.ACTION_UP) {
int x = (int) event.getX();
//判断触摸点是否在水平范围内
boolean isInnerWidth = (x > (getWidth() - getTotalPaddingRight())) &&
(x < (getWidth() - getPaddingRight()));
//获取删除图标的边界,返回一个Rect对象
Rect rect = mClearDrawable.getBounds();
//获取删除图标的高度
int height = rect.height();
int y = (int) event.getY();
//计算图标底部到控件底部的距离
int distance = (getHeight() - height) / 2;
//判断触摸点是否在竖直范围内(可能会有点误差)
//触摸点的纵坐标在distance到(distance+图标自身的高度)之内,则视为点中删除图标
boolean isInnerHeight = (y > distance) && (y < (distance + height));
if (isInnerHeight && isInnerWidth) {
this.setText("");
}
}
return super.onTouchEvent(event);
}
/**
* 设置清除图标的显示与隐藏,调用setCompoundDrawables为EditText绘制上去
*
* @param visible
*/
private void setClearIconVisible(boolean visible) {
Drawable right = visible ? mClearDrawable : null;
setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1],
right, getCompoundDrawables()[3]);
}
/**
* 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
*/
@Override
public void onFocusChange(View v, boolean hasFocus) {
this.hasFocus = hasFocus;
if (hasFocus) {
setClearIconVisible(getText().length() > 0);
} else {
setClearIconVisible(false);
}
}
/**
* 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 text, int start, int lengthBefore, int lengthAfter) {
if (hasFocus) {
setClearIconVisible(text.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.startAnimation(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;
}
}
原文链接:http://www.cnblogs.com/tonycheng93/p/4604933.html