列出 Android 中的所有相机图像

Question

如何获取 Android 设备的所有相机图像列表？

是通过 MediaStore 吗？怎么样？

Answer 1

图库应用通过使用content resolver 而非Images.Media.EXTERNAL_CONTENT_URI 并通过Media.BUCKET_ID 过滤结果来获取相机图像。桶标识符由以下代码确定：

public static final String CAMERA_IMAGE_BUCKET_NAME =
        Environment.getExternalStorageDirectory().toString()
        + "/DCIM/Camera";
public static final String CAMERA_IMAGE_BUCKET_ID =
        getBucketId(CAMERA_IMAGE_BUCKET_NAME);

/**
 * Matches code in MediaProvider.computeBucketValues. Should be a common
 * function.
 */
public static String getBucketId(String path) {
    return String.valueOf(path.toLowerCase().hashCode());
}

基于此，这里有一个获取所有相机图像的 sn-p：

public static List<String> getCameraImages(Context context) {
    final String[] projection = { MediaStore.Images.Media.DATA };
    final String selection = MediaStore.Images.Media.BUCKET_ID + " = ?";
    final String[] selectionArgs = { CAMERA_IMAGE_BUCKET_ID };
    final Cursor cursor = context.getContentResolver().query(Images.Media.EXTERNAL_CONTENT_URI, 
            projection, 
            selection, 
            selectionArgs, 
            null);
    ArrayList<String> result = new ArrayList<String>(cursor.getCount());
    if (cursor.moveToFirst()) {
        final int dataColumn = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        do {
            final String data = cursor.getString(dataColumn);
            result.add(data);
        } while (cursor.moveToNext());
    }
    cursor.close();
    return result;
}

有关详细信息，请查看图库应用源代码的 ImageManager 和 ImageList 类。