在網格視圖中顯示SD卡中特定文件夾的圖像

Question

我開發了一個應用程序，我必須從SD卡中的特定文件夾顯示圖像。我的代碼工作正常，但它顯示的所有圖像是SD卡。我已經給出了選擇參數作爲我的文件夾的名稱，因爲它已被提及以下帖子： Displaying images from a specific folder on the SDCard using a gridview

但是，它沒有奏效。請，建議我如何做到這一點： 下面我張貼我的代碼。

public class Album1Activity extends Activity { 
static Cursor imageCursor; 
static int columnIndex; 
GridView gridView; 
Intent in; 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.grid); 
    String[] imgColumnID = {MediaStore.Images.Thumbnails._ID}; 
    Uri uri = MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI; 
    imageCursor = managedQuery(uri, imgColumnID, null, null, 
        MediaStore.Images.Thumbnails.IMAGE_ID); 
    columnIndex = imageCursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID); 
    gridView = (GridView)findViewById(R.id.gridview); 
    gridView.setAdapter(new ImageAdapter(getApplicationContext())); 
    gridView.setOnItemClickListener(new OnItemClickListener() { 

     public void onItemClick(AdapterView<?> parent, View v, int position, 
       long id) { 
      String[] dataLocation = {MediaStore.Images.Media.DATA}; 
      //String []dataLocation = {Environment.getExternalStorageDirectory().getAbsolutePath()}; 
      imageCursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
         dataLocation, null, null, null); 
      columnIndex = imageCursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA); 
      imageCursor.moveToPosition(position); 
      String imgPath = imageCursor.getString(columnIndex); 
      in = new Intent(getApplicationContext(), FullScreen.class); 
      in.putExtra("id", imgPath); 
      startActivity(in); 
     }//onItemClickListener 
    }); 
}//onCreate 

public static class ImageAdapter extends BaseAdapter{ 
    private Context context; 
    //Album1Activity act = new Album1Activity(); 
    public ImageAdapter(Context context){ 
     this.context = context; 
    }//ImageAdapter 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return imageCursor.getCount(); 
    }//getCount 

    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    }//getItem 

    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    }//getItemId 

    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView iv; 
     if(convertView == null){ 
      iv = new ImageView(context); 
      imageCursor.moveToPosition(position); 
      int imageID = imageCursor.getInt(columnIndex); 
      iv.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, 
          "" +imageID)); 
      iv.setScaleType(ImageView.ScaleType.FIT_XY); 
      iv.setPadding(5, 5, 5, 5); 
      iv.setLayoutParams(new GridView.LayoutParams(100, 100)); 
     }//if 
     else{ 
      iv = (ImageView)convertView; 
     }//else 
     return iv; 
    }//getView 

}//ImageAdapter 

} // Album1Activity

Answer 1

對不起回覆遲到... 下面我張貼最終的解決方案

public class Album3 extends Activity { 
File [] mediaFiles; 
File imageDir; 
static GridView gridView; 
ImageAdapter adapter; 
Intent in; 
ImageButton btncam; 
String name = null; 
ArrayList<Bitmap> bmpArray = new ArrayList<Bitmap>(); 
ArrayList<String> fileName = new ArrayList<String>(); 
public static final String TAG = "Album3Activity"; 

public void onCreate(Bundle savedInstanceState) 
{ 
    imageDir = new File(Environment.getExternalStorageDirectory().toString()+ 
      "/diplomat"); 
    super.onCreate(savedInstanceState); 
    if((imageDir.exists())) 
    { 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.grid); 
     mediaFiles = imageDir.listFiles(); 
     //Log.d("Length of images",""+mediaFiles.length); 
     for(File file : mediaFiles) 
     { 
      bmpArray.add(convertToBitmap(file)); 
      fileName.add(readFileName(file)); 
      //Log.d(TAG + "bmpArray Size", ""+bmpArray.size()); 
      //Log.d(TAG, "call to convertToBitmap"); 
     }//for 

     adapter = new ImageAdapter(this, bmpArray, fileName); 
     gridView = (GridView)findViewById(R.id.gridview); 
     gridView.setAdapter(adapter); 
     sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED 
       , Uri.parse(Environment.getExternalStorageDirectory().toString()+"/diplomat"))); 

     gridView.setOnItemClickListener(new OnItemClickListener() { 

     public void onItemClick(AdapterView<?> arg0, View arg1, int position, 
       long arg3) { 
      in = new Intent(getApplicationContext(), FullScreen.class); 
      in.putExtra("id", position); 
      startActivity(in); 
     } 
    }); 
    }//if 
    else 
    { 
     setContentView(R.layout.no_media); 
    } 
}//onCreate 

public static Bitmap convertToBitmap(File file) 
{ 
    URL url = null; 
    try 
    { 
     url = file.toURL(); 
    } catch (MalformedURLException e1) 
    { 
     //Log.d(TAG, e1.toString()); 
    }//catch 

    Bitmap bmp = null; 
    try 
    { 
     bmp = BitmapFactory.decodeStream(url.openStream()); 
     //bmp.recycle(); 
    }catch(Exception e) 
    { 
     //Log.d(TAG, "Exception: "+e.toString()); 
    }//catch 
    return bmp; 
}//convertToBitmap 

public String readFileName(File file){ 
    String name = file.getName(); 
    return name; 
}//readFileName 
}//class 

Answer 2

你的鏈接的答案已經給出了答案。正確使用選擇參數。

cursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
    projection, 
    MediaStore.Images.Media.DATA + " like ? ", 
    **new String[] {"%myimagesfolder%"},** 
    null); 

Answer 3

您可以使用

Uri.parse（ 「路徑到SD卡的文件夾」）

方法

Answer 4

在上面的代碼UR從畫廊取回所有的圖像試試這個

File sdImageMainDirectory ; 
String imageName ; 
File root = new File(Environment.getExternalStorageDirectory() 
       + File.separator + "MYPICS" + File.separator); 
     if (!root.exists()) { 
      root.mkdirs(); 
     } 

ImageView camera = (ImageButton) findViewById(R.id.imageButton1); 

cam.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       imageName = "MyPic.png"; 
       sdImageMainDirectory = new File(root, imageName); 
       i++; 
       Uri imgUri = Uri.fromFile(sdImageMainDirectory); 

       Intent intent = new Intent(
         android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
       intent.putExtra(MediaStore.EXTRA_OUTPUT, imgUri); 
       startActivityForResult(intent, 0); 

       // startCameraActivity(); 
      } 
     }); 

@Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     switch (resultCode) { 
     case 0: 
      finish(); 
      break; 

     case -1: 
      files = root.listFiles(); 
      count = files.length; 
      try { 

       ImageView image = new ImageView(this); 

       LinearLayout.LayoutParams vp = new LinearLayout.LayoutParams(
         200, 200); 
       image.setLayoutParams(vp); 
       image.setScaleType(ImageView.ScaleType.CENTER_CROP); 
       image.setPadding(8, 8, 8, 8); 
       image.setMaxHeight(50); 
       image.setMaxWidth(50); 
       image.setAdjustViewBounds(true); 
       BitmapFactory.Options option = new BitmapFactory.Options(); 
       option.inSampleSize = 2; 
       Bitmap bm = BitmapFactory.decodeFile(root.getPath() + "/" 
         + imageName,option); 
       image.setImageBitmap(bm); 
       linearImageView.addView(image); 


      } catch (Exception e) { 
       e.printStackTrace(); 
      } 



     } 

    }