我正面临 - 相机中的空点异常，请帮帮我

问题描述

我的代码在 android 7、8、9 和 11 上运行良好，但是当我在 android 10 上运行应用程序时，我在这一行发现了这个错误 - (java.lang.NullPointerException) (camerauri = FileProvider.getUriForFile(context,context.getApplicationContext().getPackageName() + ".provider",imageFile);)

`camera.setonClickListener(new View.OnClickListener() { @覆盖 public void onClick(View view) {

            takenbycamera = true;
            if (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {

                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

                File path = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"PPS_Photo_Directory");

                if (!path.exists()) {
                    path.mkdir();
                }

                File imageFile = null;
                try {
                    imageFile = File.createTempFile("imagesample",".jpg",path);
                } catch (IOException e) {
                    e.printstacktrace();
                }

                Context context = getBaseContext();
                if (Build.VERSION.SDK_INT >= 24)
                    camerauri = FileProvider.getUriForFile(context,imageFile);
                else
                    camerauri = Uri.fromFile(imageFile);

                intent.putExtra(MediaStore.EXTRA_OUTPUT,camerauri);
                intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);

                if (Build.VERSION.SDK_INT >= 30) {
                    List<ResolveInfo> resInfoList = context.getPackageManager().queryIntentActivities(intent,PackageManager.MATCH_DEFAULT_ONLY);
                    for (ResolveInfo resolveInfo : resInfoList) {
                        String packageName = resolveInfo.activityInfo.packageName;
                        context.grantUriPermission(packageName,camerauri,Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    }
                }
                startActivityForResult(intent,CAMERA_REQUEST);
                file = new File(imageFile.getPath());

            } else {
                requestStoragePermission();
            }


        }


    });

上面是我的相机代码

@覆盖 protected void onActivityResult ( int requestCode,int resultCode,@Nullable Intent data){ super.onActivityResult(requestCode,resultCode,data);

         if (resultCode==RESULT_OK){

            if (requestCode == CAMERA_REQUEST) {
                Log.d("activityresult","camera enter");

                if (camerauri !=null)
                {
                    Log.d("activityresult","Uri enter");
                    Uri selectedImage = camerauri;
                    if (selectedImage!=null)
                    {
                        startCropActivity(selectedImage);
                        fetchOriginalImageSize(selectedImage);
                    }
                }

解决方法

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