android - 保存图像时 java.io.FileNotFoundException 权限被拒绝

Question

private void saveImage(Bitmap bitmap){
    try {
        String path = Environment.getExternalStorageDirectory().toString();
        Toast.makeText(getActivity(), path, Toast.LENGTH_SHORT).show();
        OutputStream fOut = null;
        File file = new File(path, mWallpaper.getId().toString() + ".jpg");
        fOut = new FileOutputStream(file);

        bitmap.compress(Bitmap.CompressFormat.JPEG, 85, fOut); // saving the Bitmap to a file compressed as a JPEG with 85% compression rate
        fOut.flush();
        fOut.close();

        MediaStore.Images.Media.insertImage(getActivity().getContentResolver(),file.getAbsolutePath(),file.getName(),file.getName());
    } catch (MalformedURLException e) {
        Toast.makeText(getActivity(), "Error saving wallpaper. MAL", Toast.LENGTH_SHORT).show();
    } catch (IOException e1) {
        Toast.makeText(getActivity(), "Error saving wallpaper.", Toast.LENGTH_SHORT).show();
        e1.printStackTrace();
    }
}

我将其添加到我的 AndroidManifests 中:

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

我正在尝试将图像保存到/storage/emulated/0/。

编辑

int permissionCheck = ContextCompat.checkSelfPermission(getActivity(),
            Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (ContextCompat.checkSelfPermission(getActivity(),
            Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

        if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(),
                Manifest.permission.WRITE_EXTERNAL_STORAGE)) {

        } else {

            ActivityCompat.requestPermissions(getActivity(),
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                    permissionCheck);
        }
    }

我已将此添加到我的 fragment 的 onCreate()，但我仍然不是请求。

Answer 1

if (Build.VERSION.SDK_INT >= 23) {
    int permissionCheck = ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
    }
}

如果您使用 >=api 23，请执行此操作。在此之后添加您的代码。使用此代码，您可以向用户请求运行时许可。

Requesting Permissions at Run Time Documentation from official Android site