如何在我的图库应用程序中创建文件夹？

Question

我创建了一个图库应用程序，它的工作正常。如果我运行画廊显示所有SD卡图像。
但是，如何从特定文件夹中获取图片？我是否需要更改查询？
实施例：壁纸，图像，相机，专辑等

我的源代码：

package image.Thumbnails; 

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.database.Cursor; 
import android.net.Uri; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.BaseAdapter; 
import android.widget.GridView; 
import android.widget.ImageView; 
import android.widget.AdapterView.OnItemClickListener; 

public class ImageThumbnailsActivity extends Activity { 
    /** Called when the activity is first created. */ 
    private Cursor imagecursor, actualimagecursor; 
    private int image_column_index, actual_image_column_index; 
    GridView imagegrid; 
    private int count; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     init_phone_image_grid(); 
    } 
    private void init_phone_image_grid() { 
     String[] img = { MediaStore.Images.Thumbnails._ID }; 
     imagecursor = managedQuery(
    MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, img, null, 
    null, MediaStore.Images.Thumbnails.IMAGE_ID + ""); 
     image_column_index = imagecursor 
    .getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID); 
     count = imagecursor.getCount(); 
     imagegrid = (GridView) findViewById(R.id.PhoneImageGrid); 
     imagegrid.setAdapter(new ImageAdapter(getApplicationContext())); 
     imagegrid.setOnItemClickListener(new OnItemClickListener() { 
       public void onItemClick(AdapterView parent, View v, 
    int position, long id) { 
        System.gc(); 
        String[] proj = { MediaStore.Images.Media.DATA }; 
        actualimagecursor = managedQuery(
    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj, 
    null, null, null); 
        actual_image_column_index = actualimagecursor 
    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
        actualimagecursor.moveToPosition(position); 
        String i = actualimagecursor.getString(actual_image_column_index); 
        System.gc(); 
        Intent intent = new Intent(getApplicationContext(),  
    ViewImage.class); 
        intent.putExtra("filename", i); 
        startActivity(intent); 
       } 
     }); 
     } 


    public class ImageAdapter extends BaseAdapter { 
     private    Context mContext; 
     public ImageAdapter(Context c) { 
       mContext = c; 
     } 
     public int getCount() { 
       return count; 
     } 
     public Object getItem(int position) { 
       return position; 
     } 
     public long getItemId(int position) { 
       return position; 
     } 
     public View getView(int position,View convertView,ViewGroup parent) { 
       System.gc(); 
       ImageView i = new ImageView(mContext.getApplicationContext()); 
       if (convertView == null) { 
        imagecursor.moveToPosition(position); 
        int id = imagecursor.getInt(image_column_index); 
        i.setImageURI(Uri.withAppendedPath(
     MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, "" 
     + id)); 
        i.setScaleType(ImageView.ScaleType.CENTER_CROP); 
        i.setLayoutParams(new GridView.LayoutParams(92, 92)); 
       } 
       else { 
        i = (ImageView) convertView; 
       } 
       return i; 
     } 
     } 
     } 

Answer 1

这里是源代码的链接Android图库应用：
https://android.googlesource.com/platform/packages/apps/Gallery3D

您可以将此用作您的应用的示例或起点。

Answer 2

试试这个 How to create a new folder when taking a photo from custom camera application?