Android遍历所有文件夹和子目录搜索文件

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>0)

 {

   for(int j=0;j<files.length;j++)

   {

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

  {

  if(files[j].getName().indexOf(key)> -1)

  {

  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>