android - 列出Android中的所有相机图像

如何获取Android设备的所有相机图像列表？
是通过媒体商店吗？怎么用？

最佳答案

Gallery应用程序通过在content resolver上使用Images.Media.EXTERNAL_CONTENT_URI并通过Media.BUCKET_ID过滤结果来获取相机图像。bucket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，以下是获取所有相机图像的片段：

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Gallery应用程序源代码的ImageManager和ImageList类。