Android 相机访问被拒绝

Question

我只是想用相机拍照，我正在处理权限，调试器返回java.io.IOException: Permission denied，但我无法识别错误。

此处调用相机按钮：

btn_cam.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                camera = new CameraPicture(getApplicationContext(), 10, 15);
                String[] permissionRequested = {Manifest.permission.CAMERA};
                requestPermissions(permissionRequested, camera.getPermissionRequest());
            }
        });
    }

这是处理相机的CameraPicture 类的有趣代码：

public CameraPicture(Context context, int act_res_req_num, int perm_req_num) {
        this.context = context;
        this.cam_activity_result_req_num = act_res_req_num;
        this.cam_perm_req_num = perm_req_num;
    }

public Intent takePhotoIntent() throws IOException {
        File photoFile;
        Intent in = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (in.resolveActivity(this.context.getPackageManager()) != null && (photoFile = this.createImageFile()) != null) {
            in.putExtra("output", (Parcelable)Uri.fromFile((File)photoFile));
        }
        return in;
    }


    private File createImageFile() throws IOException {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory((String)Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(imageFileName, ".jpg", storageDir);
        this.photoPath = image.getAbsolutePath();
        return image;
    }

这里似乎捕捉到异常的权限方法：

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if ((requestCode==camera.getPermissionRequest()) && (grantResults[0]==PackageManager.PERMISSION_GRANTED)){
            try {
                startActivityForResult(camera.takePhotoIntent(), camera.getActResultRequest());
            } catch (IOException e) {
                e.printStackTrace();
                System.out.println("ERROR MESSAGE: "+e);
                Toast.makeText(getApplicationContext(),"Error taking the picture ",Toast.LENGTH_LONG).show();
            }
        }else{
            Toast.makeText(getApplicationContext(),"Unable to accesss the camera without permission",Toast.LENGTH_LONG).show();
        }
    }

你觉得上面有什么不对吗？

编辑：忘记显示清单

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

<application
    android:allowBackup="true"

Answer 1

试试这个，

    private static final int REQUEST_CAMERA = 112;

    btn_cam.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                  if (Build.VERSION.SDK_INT >= 23) {
                        String[] PERMISSIONS = {android.Manifest.permission.CAMERA};
                        if (!hasPermissions(mContext, PERMISSIONS)) {
                            ActivityCompat.requestPermissions((Activity) mContext, PERMISSIONS, REQUEST_CAMERAE );
                        } else {
                            camera = new CameraPicture(getApplicationContext(), 10, 15);
                            //open camera
                        }
                    } else {
                        camera = new CameraPicture(getApplicationContext(), 10, 15);
                        //open camera
                    }
                }
            });
        }

     /*get Permissions Result*/
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case REQUEST_CAMERA: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    camera = new CameraPicture(getApplicationContext(), 10, 15);
                   //open camera
                } 
            }
        }
    }

       /*check permissions  for marshmallow*/

    private static boolean hasPermissions(Context context, String... permissions) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
            for (String permission : permissions) {
                if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
        }
        return true;
    }