如何在android中获取相机拍摄的照片的默认目录？

Question

我希望在android中获取相机拍摄的照片的默认目录。

我认为代码A可以做到这一点，并且/storage/sdcard0/DCIM显示在日志中，

但其实我用相机拍的照片都存放在文件夹/storage/extSdCard/DCIM

如何在android中获取相机拍摄的照片的默认目录？谢谢！

代码 A

File dir10 = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
Log.e("MainActivity", "getExternalStoragePublicDirectory() 10:" + dir10.toString());

更多

相机拍摄的照片的默认存储位置似乎是由用户设置的，有时是存储卡，有时是SD卡。我希望知道用户选择了哪个存储位置来存储相机拍摄的照片。

Answer 1

使用 getExternalStoragePublicDirectory() 带参数 DIRECTORY_PICTURES

File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File file = new File(path, "DemoPicture.jpg");

DIRECTORY_DCIM 将设备安装为相机时，是图片和视频的传统位置。

DIRECTORY_PICTURES 是放置用户可用图片的标准目录。

希望对你有帮助！

Answer 2

1.这只有在用户没有更改默认相机输出目录时才有效

根据文档，有两个选项

DIRECTORY_DCIM 将设备安装为相机时图片和视频的传统位置。

File musicDirectory = new File( getExternalFilesDir(Environment.DIRECTORY_DCIM));

DIRECTORY_PICTURES 放置用户可用图片的标准目录。

File musicDirectory = new File( getExternalFilesDir(Environment.DIRECTORY_PICTURES));

getExternalFilesDir() 将返回 File 对象

你可以参考这里developer page

2。如果您至少在相机中拍摄了一张照片，您还可以使用另一个技巧

String[] projection = new String[]{MediaStore.Images.ImageColumns._ID,MediaStore.Images.ImageColumns.DATA,MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,MediaStore.Images.ImageColumns.DATE_TAKEN,MediaStore.Images.ImageColumns.MIME_TYPE};     
final Cursor cursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,projection, null, null, MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC"); 
if(cursor != null){
    cursor.moveToFirst();
    //you can access last taken pics here. 
 }

Answer 3

Environment.getExternalStoragePublicDirectory 仅用于获取内部存储上的目录。

要在辅助存储（如果存在）上获取 DCIM 文件夹，您需要遵循以下代码：

String secondStorage = System.getenv("SECONDARY_STORAGE");
File file = new File(secStore + "/DCIM");
File[] listFiles = file.listFiles();

Answer 4

public class DefaultMediaRepository implements MediaRepository {
private final AppCompatActivity activity;
private LoaderManager supportLoaderManager;

DefaultMediaRepository(@NotNull AppCompatActivity activity) {
    this.activity = activity;
    supportLoaderManager = activity.getSupportLoaderManager();
}

public void media(int offset, CompletedListener<List<Media>> completedListener) {
    supportLoaderManager.initLoader((int) System.currentTimeMillis(), null,
            new MediaLoader(offset, completedListener));

}

class MediaLoader implements LoaderManager.LoaderCallbacks<Cursor> {
    private static final int LIMIT = 20;
    private Uri uri;
    private String selection;
    private String[] selectionArgs;
    private String sortOrder;
    private CompletedListener<List<Media>> completedListener;

    MediaLoader(int offset, CompletedListener<List<Media>> completedListener) {
        this.completedListener = completedListener;
        uri = MediaStore.Files.getContentUri("external");
        selection = "("
                + FileColumns.MEDIA_TYPE + "="
                + FileColumns.MEDIA_TYPE_IMAGE
                + " OR "
                + FileColumns.MEDIA_TYPE + "="
                + FileColumns.MEDIA_TYPE_VIDEO
                + ")"
                + " AND "
                + ImageColumns.BUCKET_DISPLAY_NAME
                + " = ?";
        selectionArgs = new String[]{"Camera"};
        sortOrder = ImageColumns.DATE_TAKEN + " DESC " +
                " LIMIT " + LIMIT + " offset " + offset;
    }

    @NonNull
    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle bundle) {
        return new CursorLoader(activity.getApplicationContext(), uri, null, selection,
                selectionArgs, sortOrder);
    }

    @Override
    public void onLoaderReset(@NonNull Loader<Cursor> loader) {
    }

    @Override
    public void onLoadFinished(@NonNull Loader<Cursor> loader, @NotNull Cursor cursor) {
        @SuppressLint("UseSparseArrays") List<Media> list = new LinkedList<>();
        while (cursor.moveToNext()) {
            long id = cursor.getLong(cursor.getColumnIndexOrThrow(FileColumns._ID));
            int media = cursor.getInt(cursor.getColumnIndexOrThrow(FileColumns.MEDIA_TYPE));
            Uri uri = Uri.withAppendedPath(this.uri, "" + id);
            list.add(new Media(uri.toString(), media == FileColumns.MEDIA_TYPE_VIDEO));
        }
        cursor.close();
        completedListener.completed(list);
        supportLoaderManager.destroyLoader(loader.getId());
    }
}
}