记录下一个很实用的小控件EditTextWithDel,就是在Android系统的输入框右边加入一个小图标,点击小图标可以清除输入框里面的内容,由于Android原生EditText不具备此功能,所以要想实现这一功能我们需要重写EditText。
效果图如下:
主要的思路就是为右边的图片设置监听,点击右边的图片清除输入框的内容并隐藏删除图标,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,用输入框的的onTouchEvent()方法来模拟.
package com.xiaolijuan.edittextwithdeldome;
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.util.Log;
import android.view.MotionEvent;
import android.widget.EditText;
/**
* @author: adan
* @description: 自定义带有删除功能的EditText
* @projectName: EditTextWithDelDome
* @date: 2016-02-28
* @time: 23:34
*/
public class EditTextWithDel extends EditText {
private final static String TAG = "EditTextWithDel";
private Drawable imgInable;
private Drawable imgAble;
private Context mContext;
public EditTextWithDel(Context context) {
super(context);
mContext = context;
init();
}
public EditTextWithDel(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
init();
}
public EditTextWithDel(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
private void init() {
imgAble = mContext.getResources().getDrawable(
R.mipmap.icon_delete_gray);
addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
setDrawable();
}
});
setDrawable();
}
// 设置删除图片
private void setDrawable() {
if (length() < 1) {
setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);
} else {
setCompoundDrawablesWithIntrinsicBounds(null, null, imgAble, null);
}
}
// 处理删除事件
@Override
public boolean onTouchEvent(MotionEvent event) {
if (imgAble != null && event.getAction() == MotionEvent.ACTION_UP) {
int eventX = (int) event.getRawX();
int eventY = (int) event.getRawY();
Log.e(TAG, "eventX = " + eventX + "; eventY = " + eventY);
Rect rect = new Rect();
getGlobalVisibleRect(rect);
rect.left = rect.right - 50;
if (rect.contains(eventX, eventY))
setText("");
}
return super.onTouchEvent(event);
}
@Override
protected void finalize() throws Throwable {
super.finalize();
}
}
setDrawable()方法,setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top, Drawable right, Drawable bottom)来在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。