import java.io.File;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class ShuosouwenjianActivity extends Activity  implements OnClickListener  {

    private File file;

    private String path;

    private String info;

    private String key; //关键字

    private TextView result; // 显示结果

    private EditText et; // 编辑view

    private Button search_btn; // button view  

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        result = (TextView)findViewById(R.id.TextView_Result);

        et = (EditText)findViewById(R.id.key);

        search_btn = (Button)findViewById(R.id.button_search);

       // file = new File(Environment.getExternalStorageDirectory().getPath());

        file = new File("/sdcard/");

        info = getString(R.string.info);  

        search_btn.setOnClickListener(this);

    }  

    @Override

    public void onClick(View v) {

        // TODO Auto-generated method stub

        path = "";

        result.setText("");

        key = et.getText().toString();

        BrowserFile(file);

    }  

    public void BrowserFile(File fileold) {

        if (key.equals("")) {

            Toast.makeText(this, getString(R.string.pleaseInput), Toast.LENGTH_LONG).show();

        } else {

         search(fileold);

            if (result.getText().equals("")) {

                Toast.makeText(this, getString(R.string.notFound), Toast.LENGTH_SHORT).show();

            }

        }

    }  

 private void search(File fileold)

    {

     try{

  File[] files=fileold.listFiles();

  if(files.length>)

  {

     for(int j=;j<files.length;j++)

     {

   if(!files[j].isDirectory())

   {

   if(files[j].getName().indexOf(key)> -)

    {

    path += "\n" + files[j].getPath();

       result.setText(info+path);

          //shuju.putString(files[j].getName().toString(),files[j].getPath().toString());

    }

   }

   else{

    this.search(files[j]);

   }

     }

  }

  }

     catch(Exception e)

     {

     }

    }

}

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

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

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:id="@+id/widget0"

    > 

<Button

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:id="@+id/button_search"

    android:layout_x="253px"

    android:layout_y="5px"

    android:text="@string/toSearch"

/>

<EditText

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:id="@+id/key"

    android:text="821077962.db"  

/>

<TextView

    android:layout_width="fill_parent"

    android:layout_height="370px"

    android:id="@+id/TextView_Result"

    android:layout_x="0px"

    android:layout_y="60px"

/>

</AbsoluteLayout>

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

<resources>

    <string name="hello">Hello World, Activity07!</string>

    <string name="app_name">文件搜索</string>

    <string name="toSearch">搜索</string>

    <string name="info">系统SDCard目录文件路径：\n</string>

    <string name="pleaseInput">请输入关键字!</string>

    <string name="notFound">SD卡中没有相关文件!!</string>

    <string name="pathError">读取路径出错!!</string>

</resources>