Android 带清除功能的输入框控件EditTextWithDel

记录下一个非常有用的小控件EditTextWithDel。就是在Android系统的输入框右边增加一个小图标。点击小图标能够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须要重写EditText。

效果图例如以下：

基本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,由于我们不能直接给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: 自己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，假设不想在某个地方显示，则设置为null。

接下来我们来使用它设置Activity的布局。一个我们自己定义的输入框，一个button

<?

xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <RelativeLayout

        android:layout_width="match_parent"

        android:layout_height="60dp"

        android:layout_margin="25dp"

        android:background="#ffffff">

        <ImageView

            android:id="@+id/img"

            android:layout_width="25dp"

            android:layout_height="30dp"

            android:layout_alignParentLeft="true"

            android:layout_centerVertical="true"

            android:layout_margin="5dp"

            android:src="@mipmap/ic_launcher" />

        <ImageView

            android:layout_width="match_parent"

            android:layout_height="1dp"

            android:layout_alignParentBottom="true"

            android:layout_marginLeft="2dp"

            android:layout_marginRight="2dp"

            android:background="#56AB55" />

        <com.xiaolijuan.edittextwithdeldome.EditTextWithDel

            android:id="@+id/et_phoneNumber"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentBottom="true"

            android:layout_alignParentRight="true"

            android:layout_alignParentTop="true"

            android:layout_margin="2dp"

            android:layout_toRightOf="@+id/img"

            android:background="#ffffff"

            android:hint="请输入手机号码"

            android:maxLength="11"

            android:phoneNumber="true"

            android:singleLine="true" />

    </RelativeLayout>

    <Button

        android:id="@+id/btn"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_margin="25dp"

        android:background="#56AB55"

        android:text="确定" />

</LinearLayout>

然后就是界面代码的编写。主要測试下输入框

package com.xiaolijuan.edittextwithdeldome;

import android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

    private EditText userName;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        userName = (EditText) findViewById(R.id.et_phoneNumber);

        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                if (TextUtils.isEmpty(userName.getText().toString())){

                    Toast.makeText(getApplicationContext(),"手机号码为空",Toast.LENGTH_LONG).show();

                    return;

                }

                Toast.makeText(getApplicationContext(),userName.getText().toString(),Toast.LENGTH_LONG).show();

            }

        });

    }

}

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