Android输入框带删除按钮的自定义View

废话不多说，用最少的代码来实现，记得弄一张名字叫 common_ic_delete 做完删除的图到drawable里。

package com.aiitec.widgets;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.EditText;

/**
* @author Anthony
* @createTime 2016-06-20
* 带删除按钮的输入框，点击X就删除文字，并提供一个删除监听接口
*
*/
public class DeleteEditText extends EditText {

private int padding, drawablePadding;
private Bitmap deleteImg ;
private int deleteX, deleteY, deleteW, deleteH;

public DeleteEditText(Context context){
super(context);
init();
}
public DeleteEditText(Context context, AttributeSet attrs){
super(context, attrs);
init();
}
public DeleteEditText(Context context, AttributeSet attrs, int defStyleAttr){
super(context, attrs, defStyleAttr);
init();
}
private void init(){
padding = dip2px(getContext(), 4);
drawablePadding = dip2px(getContext(), 8);
int backgroundRec = getResources().getIdentifier("common_ic_delete", "drawable", getContext().getPackageName());
if (backgroundRec > 0) {
Drawable drawable = getResources().getDrawable(backgroundRec);
deleteImg = ((BitmapDrawable) drawable).getBitmap();
}
}

public void setPadding(int padding) {
this.padding = padding;
}

public void setDrawablePadding(int drawablePadding) {
this.drawablePadding = drawablePadding;
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(!TextUtils.isEmpty(getText().toString().trim()) && deleteImg != null){
int x = getWidth() - deleteImg.getWidth()- drawablePadding-padding;
int y = (getHeight() - deleteImg.getHeight())>>1;
//删除按钮区域比，按钮大4dp
deleteX = x-padding;
deleteW = x + deleteImg.getWidth() + padding;
deleteY = y - padding;
deleteH = y + deleteImg.getHeight() + padding;
Paint paint = new Paint();
canvas.drawBitmap(deleteImg, x, y, paint);

}
}

private long downTime ;

@Override
public boolean dispatchTouchEvent(MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
downTime = System.currentTimeMillis();
break;
case MotionEvent.ACTION_UP:
long upTime = System.currentTimeMillis();
if(upTime-downTime < 500 ){
//短按才算，长按不算
if(event.getX() > deleteX && event.getX()<deleteW && event.getY() > deleteY && event.getY()<deleteH){
//点击删除按钮区域
setText("");
if(onDeleteListener != null){
onDeleteListener.onDelete();
}
}

}
break;
}
return super.dispatchTouchEvent(event);
}

private OnDeleteListener onDeleteListener;

public void setOnDeleteListener(OnDeleteListener onDeleteListener) {
this.onDeleteListener = onDeleteListener;
}

/**
* 删除按钮监听接口
*/
public interface OnDeleteListener{
void onDelete();
};
public static int dip2px(Context context, float dpValue) {
float scale = context.getResources().getDisplayMetrics().density;
return (int)(dpValue * scale + 0.5F);
}
}