Android 带清除功能的输入框控件EditTextWithDel

   <p>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。</p>    <p>效果图如下：</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/e753eb6247495327cf1ce6725e1ca2cf.gif"></p>    <p style="text-align:center">这里写图片描述</p>    <p>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.</p>    <pre>  <code class="language-java">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();      }  }</code></pre>    <p>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。</p>    <p>接下来我们来使用它设置Activity的布局，一个我们自定义的输入框，一个按钮</p>    <pre>  <code class="language-java"><?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></code></pre>    <p>然后就是界面代码的编写，主要测试下输入框</p>    <pre>  <code class="language-java">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();              }          });      }  }</code></pre>    <p> </p>    <p> </p>    <p>来自：http://www.jianshu.com/p/2b3896a78e61</p>    <p> </p>