从Android设备android编程获取所有照片

Question

我正在尝试获取我的Android设备的所有照片.

我有一个onCreate功能:

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ImageAdapter adapter= new ImageAdapter(this);
    final String[] columns = { MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID };

    final String orderBy = MediaStore.Images.Media._ID;
    Uri rr= MediaStore.Images.Media.INTERNAL_CONTENT_URI;
    Cursor  imagecursor = getContentResolver().query(
            MediaStore.Images.Media.INTERNAL_CONTENT_URI,null, null,        
            null, orderBy);
    int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);          
    this.count = imagecursor.getCount();        
    this.thumbnails = new Bitmap[this.count];       
    for (int i = 0; i < this.count; i++) {

        imagecursor.moveToPosition(i);

        int id = imagecursor.getInt(image_column_index);         

      thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(        
                getApplicationContext().getContentResolver(), id,       
                MediaStore.Images.Thumbnails.MICRO_KIND, null);     
      adapter.mThumbIds[i]= thumbnails[i];

    }

}

返回的计数返回imageCursor.getCount()0.

有人可以指导我,因为我无法使用此代码获取任何媒体？

注意:我正在测试Galaxy Note-2

Answer 1

首先不要忘记

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> 

此方法将返回图库中的照片列表

public static ArrayList<String> getImagesPath(Activity activity) {
    Uri uri;
    ArrayList<String> listOfAllImages = new ArrayList<String>();
    Cursor cursor;
    int column_index_data, column_index_folder_name;
    String PathOfImage = null;
    uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

    String[] projection = { MediaColumns.DATA,
            MediaStore.Images.Media.BUCKET_DISPLAY_NAME };

    cursor = activity.getContentResolver().query(uri, projection, null,
            null, null);

    column_index_data = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
    column_index_folder_name = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
    while (cursor.moveToNext()) {
        PathOfImage = cursor.getString(column_index_data);

        listOfAllImages.add(PathOfImage);
    }
    return listOfAllImages;
}