无法将流图像解码为片段

Question

代码完美的作品，但我有问题的权限拒绝，但我已经把READ_EXTERNAL_STORAGE和WRITE_EXTERNAL_STORAGE权限Android清单任何想法。已经尝试过这个无法解码流：java.io.FileNotFoundExc0019（权限被拒绝）

位图工厂﹕ 无法解码流-空

E/BitmapFactory:无法解码流：java.io.FileNotFoundException:/storage/emulated/0/DCIM/Camera/IMG_20201001_125759.jpg（权限被拒绝）

Androidanifest.xml

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

主要活动

    //Open phone gallery
    private void getImageFromGallery(){
        Intent i = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(i, GALLERY_REQUEST);
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //Check if the intent was to pick image, was successful and an image was picked
        if (requestCode == GALLERY_REQUEST && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };
            Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
            cursor.moveToFirst();
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();
            ImageView imageView = (ImageView) findViewById(R.id.the_grid_image_preview);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        }
    }

Answer 1

如果您使用的是Android 6.0版或更高版本，则需要在运行时请求权限：

https://developer.android.com/training/permissions/requesting

为此，我使用了一个叫做Dexter的不错的包装器，它简化了它，并且非常容易使用。

然后，您可以在片段中编写此函数：

private fun checkFilePermissions(onPermissionGranted: () -> Unit) {
        Dexter.withActivity(activity)
            .withPermissions(
                android.Manifest.permission.READ_EXTERNAL_STORAGE,
                android.Manifest.permission.WRITE_EXTERNAL_STORAGE
            )
            .withListener(object : BaseMultiplePermissionsListener() {
                override fun onPermissionsChecked(response: MultiplePermissionsReport) {
                    if (response.areAllPermissionsGranted()) {
                        onPermissionGranted()
                    }
                }
            })
            .check()
    }

在调用方法getImageFromGallery（）时，只需像这样调用它：

...
checkFilePermissions {
    getImageFromGallery()
}