重命名图库中的所选图像

Question

我正在尝试制作一个用户可以从图库中选择图像并将其重命名为所需名称的应用，从图库中获取图像的代码是

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
            photoPickerIntent.setType("image/*");
            startActivityForResult(photoPickerIntent, RESULT_LOAD_IMG);

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK){
        try {
            upload.setVisibility(View.INVISIBLE);
            Image.setVisibility(View.VISIBLE);
            final Uri imageUri = data.getData();
            final InputStream imageStream = getContentResolver().openInputStream(imageUri);
            final Bitmap selectedImage = BitmapFactory.decodeStream(imageStream);

            Image.setImageBitmap(selectedImage);
            Log.i("FileName is", fileName);
        } catch (FileNotFoundException e){
            e.printStackTrace();
            Toast.makeText(getApplicationContext(),"Error Loading Image",Toast.LENGTH_LONG).show();
        }
    } else {
        Toast.makeText(getApplicationContext(),"Please select an image",Toast.LENGTH_LONG).show();
    }
}

我看过一些文章，它们使用from和to重命名Images，但是我不明白它是如何工作的以及如何设置所需的名称（用户将通过editText输入）。

任何帮助，将不胜感激

Answer 1

在这里，您可以找到@Davewebb的相关解决方案，您对from to感到困惑

File sdcard = Environment.getExternalStorageDirectory();
File from = new File(sdcard,"from.txt");
File to = new File(sdcard,"to.txt");
from.renameTo(to);

from.txt是您的旧名称，新名称将在此处to.txt

对于内部存储，您可以读取这样的文件，并执行与上面相同的过程

private String readFileFromInternalStorage(){
ImageView imageView = (ImageView) findViewById(R.id.image);
ContextWrapper cw = new ContextWrapper(context);

//path to /data/data/yourapp/app_data/dirName
File directory = cw.getDir("dirName", Context.MODE_PRIVATE);          
File mypath=new File(directory,"imagename.jpg");

ImageView imageView = (ImageView) findViewById(R.id.image);
    imageView.setImageDrawable(Drawable.createFromPath(mypath.toString()));
}

Answer 2

这是可能对您有帮助的代码

    File sdcard = Environment.getExternalStorageDirectory();
    File from = new File(sdcard, "from.txt");
    File to = new File(sdcard, "to.txt");
    if (updateFileName(context, from, to))
        Log.d("File Rename", "Successfully renamed");
    else Log.d("File Rename", "Rename filed");

 public static boolean updateFileName(Context mContext, File from, File to) {
        if (from.renameTo(to)) {
            removeMedia(mContext, from);
            updateMediaInGallery(mContext, to);
            return true;
        } else {
            return false;
        }
    }

    public static void updateMediaInGallery(Context c, File f) {
        Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        intent.setData(Uri.fromFile(f));
        c.sendBroadcast(intent);
    }

    private static void removeMedia(Context c, File f) {
        ContentResolver resolver = c.getContentResolver();
        resolver.delete(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, MediaStore.Images.Media.DATA + "=?", new String[]{f.getAbsolutePath()});
    }