java - 相机 Intent 使 Android 应用程序不断崩溃

Question

我正在编写一个简单的库存管理应用程序，它可以拍摄要记录的元素的照片。因此，预期的行为是用户按下按钮启动相机、拍照并返回应用程序以输入文本信息。但我不断收到以下安全异常错误

java.lang.SecurityException: Permission Denial: starting Intent {
act=android.media.action.IMAGE_CAPTURE cmp=com.android.camera/.Camera } 
from ProcessRecord{734dbfd 22169:com.virgo19.tinni.teatracker/u0a58} 
(pid=22169, uid=10058) with revoked permission android.permission.CAMERA

我在网上浏览了好几天，似乎没有任何解决方案，因为我已经按照 Android 开发人员的说明进行操作。包括有关在运行时请求许可的指令。代码 fragment 如下，

//Code calling camera intent
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if (cameraIntent.resolveActivity(getPackageManager()) != null) {
            startActivityForResult(cameraIntent, RETURN_FROM_CAMERA);
        }

//On activity return request fragment

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == RETURN_FROM_CAMERA && data != null){
            //Check permissions
            int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA);
            if(permissionCheck == PackageManager.PERMISSION_GRANTED){
                //Permission is okay, so get on with getting image from Camera
                Bundle extras = data.getExtras();
                tinImage = (Bitmap) extras.get("data");
                //set image view
                setImage();
            } else if (permissionCheck != PackageManager.PERMISSION_GRANTED){
                //Permission not granted, ask for permission
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA},
                        REQUEST_CAMERA);
            }
        }
    }

有人能明白为什么它总是崩溃吗？谢谢!

Answer 1

在通过 startActivityForResult() 拍照之前，您需要请求 CAMERA 权限。您当前的代码在拍照后尝试请求此权限。