java - 文件未找到异常 : open failed: EACCES (Permission denied)

Question

在模拟器中(我使用 genymotion)它工作正常，但是当我在真实设备上运行它时(我的手机是 ASUS ZenFone Laser 5.0)抛出一个 filenotfoundexception

java.io.FileNotFoundException:/storage/emulated/0/cam20160926_075819.jpg: 打开失败:EACCES(权限被拒绝)

imgBitmap = MediaStore.Images.Media.getBitmap(cr, selectedImage);

这是 onActivityResult() 方法

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode){
            case CAMERA_REQUEST:
                if (resultCode == Activity.RESULT_OK){
                    Uri selectedImage = imageUri;
                    getActivity().getContentResolver().notifyChange(selectedImage, null);
                    ContentResolver cr = getActivity().getContentResolver();
                    Bitmap imgBitmap;
                    try {
                        imgBitmap = MediaStore.Images.Media.getBitmap(cr, selectedImage);

                        accountPhoto.setImageBitmap(imgBitmap);
                    } catch (IOException e) {
                        e.printStackTrace();
                        Toast.makeText(getActivity().getApplicationContext(), "Something went wrong while taking a photo", Toast.LENGTH_LONG).show();
                        Log.e("Camera", e.toString());
                    }

                }
        }
    }

我看了一些关于这个EACCES的相关问题和解决方案，看来问题是在我的允许下:

<uses-feature android:name="android.hardware.camera2" android:required="true"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

我错过了什么吗？谢谢回复

Answer 1

你必须在开始你的指令之前请求许可，因为这个许可在 Marshmallow 中被认为是危险的:

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && 
checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) 
     {
      requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, RESULT);
     } 
    else
     {
    //your code
     }