<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <EditText         android:id="@+id/txtSearch"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入"/></LinearLayout>

import android.app.Activity;import android.content.res.Resources;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.text.Editable;import android.text.InputType;import android.text.TextUtils;import android.text.TextWatcher;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private Drawable mIconSearchDefault; // 搜索文本框默认图标    private Drawable mIconSearchClear; // 搜索文本框清除文本内容图标    private EditText mSearchView = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 得到资源里面的图标文件        final Resources res = getResources();        // 默认的图标        mIconSearchDefault = res.getDrawable(R.drawable.txt_search_default);        // 清除图标        mIconSearchClear = res.getDrawable(R.drawable.txt_search_clear);        mSearchView = (EditText) findViewById(R.id.txtSearch);        mSearchView.addTextChangedListener(tbxSearch_TextChanged);        mSearchView.setOnTouchListener(txtSearch_OnTouch);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    /**     * 判断输入框中是否有数据，然后显示相应的图标文件     */    private TextWatcher tbxSearch_TextChanged = new TextWatcher() {        // 缓存上一次文本框内是否为空        private boolean isnull = true;        @Override        public void afterTextChanged(Editable s) {            if (TextUtils.isEmpty(s)) {                if (!isnull) {                    mSearchView.setCompoundDrawablesWithIntrinsicBounds(null,                            null, mIconSearchDefault, null);                    isnull = true;                }            } else {                if (isnull) {                    mSearchView.setCompoundDrawablesWithIntrinsicBounds(null,                            null, mIconSearchClear, null);                    isnull = false;                }            }        }        @Override        public void beforeTextChanged(CharSequence s, int start, int count,                int after) {        }        /**         * 随着文本框内容改变动态改变列表内容         */        @Override        public void onTextChanged(CharSequence s, int start, int before,                int count) {        }    };        // 当清除图标被点击的时候的处理事件    private OnTouchListener txtSearch_OnTouch = new OnTouchListener() {        @Override        public boolean onTouch(View v, MotionEvent event) {            switch (event.getAction()) {            case MotionEvent.ACTION_UP:                int curX = (int) event.getX();                if (curX > v.getWidth() - 38                        && !TextUtils.isEmpty(mSearchView.getText())) {                    mSearchView.setText("");                    int cacheInputType = mSearchView.getInputType();// backup                                                                    // the input                                                                    // type                    mSearchView.setInputType(InputType.TYPE_NULL);// disable                                                                    // soft                                                                    // input                    mSearchView.onTouchEvent(event);// call native handler                    mSearchView.setInputType(cacheInputType);// restore input                    Toast toast = Toast.makeText(MainActivity.this, "你好啊", Toast.LENGTH_SHORT);                    toast.show();                                                                                    // type                    return true;// consume touch even                }                break;            }            return false;        }    };}