Android--文件或目录拷贝、复制、粘贴

需要给 AndroidManifest.xml里加上权限：

源码：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
 
public class Copy_File extends Activity
{
    private Button m_btn = null;
    private final static String FROMPATH = "/mnt/sdcard/A/";
    private final static String TOPATH = "/mnt/sdcard/B/";
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        m_btn = (Button)findViewById(R.id.button1);
        m_btn.setOnClickListener(new OnClickListener()
        {
 
            @Override
            public void onClick(View v)
            {
                // TODO Auto-generated method stub
                if(copy(FROMPATH, TOPATH)==0)
                {
                    Toast.makeText(Copy_File.this,"文件拷贝成功！！！",20000).show();
                }else
                {
                    Toast.makeText(Copy_File.this,"文件拷贝失败！！！",20000).show();
                }
            }
                 
        });
    }
     
    public int copy(String fromFile, String toFile)
    {
        //要复制的文件目录
        File[] currentFiles;
        File root = new File(fromFile);
        //如同判断SD卡是否存在或者文件是否存在
        //如果不存在则 return出去
        if(!root.exists())
        {
            return -1;
        }
        //如果存在则获取当前目录下的全部文件 填充数组
        currentFiles = root.listFiles();
         
        //目标目录
        File targetDir = new File(toFile);
        //创建目录
        if(!targetDir.exists())
        {
            targetDir.mkdirs();
        }
        //遍历要复制该目录下的全部文件
        for(int i= 0;i 0)
            {
                fosto.write(bt, 0, c);
            }
            fosfrom.close();
            fosto.close();
            return 0;
             
        } catch (Exception ex)
        {
            return -1;
        }
    }
     
 
}