测试方法： 在sdcard  目录下新建名为photo的文件夹 .并将此文件夹 中复制少量图片。import java.io.File;

import android.app.Activity;

import android.content.Intent;

import android.media.MediaScannerConnection;

import android.media.MediaScannerConnection.MediaScannerConnectionClient;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

/**

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*/

public class SDCARD123Activity extends Activity implements MediaScannerConnectionClient{

public String[] allFiles;

private String SCAN_PATH ;

private static final String FILE_TYPE="image/*";

private MediaScannerConnection conn;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

File folder = new File("/sdcard/Photo/");

allFiles = folder.list();

//   uriAllFiles= new Uri[allFiles.length];

for(int i=0;i

{

Log.d("all file path"+i, allFiles[i]+allFiles.length);

}

//  Uri uri= Uri.fromFile(new File(Environment.getExternalStorageDirectory().toString()+"/yourfoldername/"+allFiles[0]));

SCAN_PATH=Environment.getExternalStorageDirectory().toString()+"/Photo/"+allFiles[0];

System.out.println(" SCAN_PATH  " +SCAN_PATH);

Log.d("SCAN PATH", "Scan Path " + SCAN_PATH);

Button scanBtn = (Button)findViewById(R.id.scanBtn);

scanBtn.setOnClickListener(new OnClickListener(){

@Override

public void onClick(View v) {

startScan();

}});

}

private void startScan()

{

Log.d("Connected","success"+conn);

if(conn!=null)

{

conn.disconnect();

}

conn = new MediaScannerConnection(this,this);

conn.connect();

}

@Override

public void onMediaScannerConnected() {

Log.d("onMediaScannerConnected","success"+conn);

conn.scanFile(SCAN_PATH, FILE_TYPE);

}

@Override

public void onScanCompleted(String path, Uri uri) {

try {

Log.d("onScanCompleted",uri + "success"+conn);

System.out.println("URI " + uri);

if (uri != null)

{

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.setData(uri);

startActivity(intent);

}

} finally

{

conn.disconnect();

conn = null;

}

}

}

自：http://stackoverflow.com/questions/10749351/how-to-open-one-particular-folder-from-gallery-in-android