Android-高速地搜索手机文件引擎小程序(File I/O)

main.xml代码如下：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TableLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >        <TableRow>            <TextView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text="请输入要搜索的关键字：" />            <EditText                android:id="@+id/edit"                android:layout_width="120px"                android:layout_height="wrap_content" />        </TableRow>    </TableLayout>    <Button        android:id="@+id/btn_search"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="搜索" />    <TextView        android:id="@+id/info"        android:layout_width="fill_parent"        android:layout_height="wrap_content" /></LinearLayout>

package org.lxh.demo;import java.io.File;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnFocusChangeListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class Hello extends Activity {	private Button search = null;	private TextView info = null;	private EditText edit = null;	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState); // 生命周期方法		super.setContentView(R.layout.main); // 设置要使用的布局管理器		this.edit = (EditText) super.findViewById(R.id.edit);		this.info = (TextView) super.findViewById(R.id.info);		this.search = (Button) super.findViewById(R.id.btn_search);		this.search.setOnClickListener(new OnClick());	}	private class OnClick implements OnClickListener {		public void onClick(View arg0) {			String keyWords = Hello.this.edit.getText().toString();			if (keyWords.equals("")) {				Hello.this.info.setText("请输入关键字！");			} else {				Hello.this.info.setText(searchFile(keyWords));			}		}		private CharSequence searchFile(String keyWords) {			String result = "";			File[] files = new File("/").listFiles();//获取所有文件			for (File f : files) {				if (f.getName().indexOf(keyWords) >= 0) {//文件名匹配					result += f.getPath() + "\n";				}			}			if (result.equals("")) {				result = "找不到文件！";			}			return result;		}	}}