Android 搜索SD卡文件的开发示例

XML/HTML代码
<?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" > 
 
  <EditText  
    android:id="@+id/editText2" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="/" 
    /> 
    
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="20dp" 
    android:orientation="horizontal" > 
      
    <TextView  
      android:text="输入文件名字：" 
      android:textSize="20dp" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      /> 
    <EditText 
      android:id="@+id/editText1" 
      android:textSize="20dp" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      /> 
  </LinearLayout> 
    
  <Button  
    android:id="@+id/button1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="开始搜索" 
    /> 
    
  <TextView  
    android:id="@+id/textView1" 
    android:layout_marginTop="20dp" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    /> 
      
</LinearLayout> 

File[] files = new File(file.getPath()).listFiles();  
      
    for (File f : files)  
    {  
      if (f.getName().indexOf(keyword) >= 0)  
      {  
        res += f.getPath() + "\n";  
      }  
    } 

package net.javablog.mobile;  
 
import android.app.Activity;  
import android.os.Bundle;  
import android.widget.Button;  
import android.widget.TextView;  
import android.widget.EditText;  
import android.view.View;  
import java.io.File;  
 
public class Main extends Activity {  
    
  private TextView textView1;  
  private EditText editText1;  
  private EditText editText2;  
  private Button button1;  
    
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  
    
    textView1 = (TextView) findViewById (R.id.textView1);  
    editText1 = (EditText) findViewById (R.id.editText1);  
    editText2 = (EditText) findViewById (R.id.editText2);  
    button1 = (Button) findViewById (R.id.button1);  
      
    button1.setOnClickListener(new Button.OnClickListener()  
    {  
      @Override 
      public void onClick (View view)  
      {  
        String keyword = editText1.getText().toString();  
        File root = new File(editText2.getText().toString());  
          
        if (keyword.equals(""))  
        {  
          String res = "";  
          File[] files = root.listFiles();  
          for(File f : files)  
          {  
            res += f.getPath() + "\n";  
          }  
          textView1.setText(res);  
          return;  
        }  
        else 
        {  
          textView1.setText(findFile(root, keyword));  
        }  
          
        return;  
      }  
    });  
  }  
    
  private String findFile (File file, String keyword)  
  {  
    String res = "";  
    if (!file.isDirectory())  
    {  
      res = "不是目录";  
      return res;  
    }  
    File[] files = new File(file.getPath()).listFiles();  
      
    for (File f : files)  
    {  
      if (f.getName().indexOf(keyword) >= 0)  
      {  
        res += f.getPath() + "\n";  
      }  
    }    
 
     if (res.equals(""))  
    {  
      res = "没有找到相关文件";  
    }  
       
    return res;  
        
  }  
}