1.布局文件

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin">

android:id="@+id/input"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

android:id="@+id/edit_text"

android:layout_width="250dp"

android:layout_height="40dp"

android:layout_marginTop="5dp"

android:hint="请输入内容" />

android:id="@+id/imagebutton_delecte"

android:layout_width="40dp"

android:layout_height="40dp"

android:layout_marginTop="5dp"

android:src="@drawable/txt_search_clear"

android:visibility="gone"/>

android:id="@+id/imagebutton_search"

android:layout_width="40dp"

android:layout_height="40dp"

android:layout_marginLeft="0dp"

android:layout_marginTop="5dp"

android:src="@drawable/txt_search_default"

/>

这里用到了两个ImageButton，用来切换，当在编辑框中输入文字，显示带删除的图标，当编辑框中内容为空时，显示搜索图标

2. MainActivity Java代码

package com.example.searchdelete;

import android.support.v7.app.ActionBarActivity;

import android.text.Editable;

import android.text.TextWatcher;

import android.os.Bundle;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.EditText;

import android.widget.ImageButton;

public class MainActivity extends ActionBarActivity {

private EditText edittext;

private ImageButton searchclear;

private ImageButton search;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initView();

initEvent();

}

private void initEvent() {

searchclear.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

edittext.setText("");

}

});

edittext.addTextChangedListener(new TextWatcher() {

@Override

public void onTextChanged(CharSequence arg0, int arg1, int arg2,

int arg3) {

// TODO Auto-generated method stub

}

@Override

public void beforeTextChanged(CharSequence arg0, int arg1,

int arg2, int arg3) {

// TODO Auto-generated method stub

}

@Override

public void afterTextChanged(Editable s) {

if (!(s.length() == 0)) {

searchclear.setVisibility(View.VISIBLE);

search.setVisibility(View.GONE);

} else {

searchclear.setVisibility(View.GONE);

search.setVisibility(View.VISIBLE);

}

}

});

}

private void initView() {

edittext = (EditText) findViewById(R.id.edit_text);

searchclear = (ImageButton) findViewById(R.id.imagebutton_delecte);

search = (ImageButton) findViewById(R.id.imagebutton_search);

}

}

效果如下：当编辑框中没有内容时候显示搜索图标

当输入内容时候，出现删除图标 ，点击即可删除

代码关键如下所示：