自定义带一键清除的EditText

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