android中调用相机拍照返回null的问题的终极解决办法

    private ArrayList<String> mImageList;
    private static final int REQUEST_CAMERA = 5;        // 相机拍照标记
    private static final int CAMERA_REQUEST_CODE = 1;

    /**
     * 拍照获取照片
     */
    protected void selectPicFromCamera() {
        if (!SDCardUtils.isSDCardEnable()){
            //不存在sd卡
            Toast.makeText(this,R.string.sd_disable,Toast.LENGTH_SHORT).show();
            return;
        }
        //android 6.0之后需要动态申请权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
                != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
        }

        Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        if (cameraIntent.resolveActivity(this.getPackageManager()) != null) {
            tempFile = new File(FileUtils.createRootPath(this) + "/" + System.currentTimeMillis() + ".jpg");
            LogUtils.e(tempFile.getAbsolutePath());
            FileUtils.createFile(tempFile);

            Uri uri = FileProvider.getUriForFile(this,
                    FileUtils.getApplicationId(this) + ".provider", tempFile);

            List<ResolveInfo> resInfoList = this.getPackageManager()
                    .queryIntentActivities(cameraIntent, PackageManager.MATCH_DEFAULT_ONLY);
            for (ResolveInfo resolveInfo : resInfoList) {
                String packageName = resolveInfo.activityInfo.packageName;
                this.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                        | Intent.FLAG_GRANT_READ_URI_PERMISSION);
            }

            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri); //Uri.fromFile(tempFile)
            startActivityForResult(cameraIntent, REQUEST_CAMERA);
        } else {
            Toast.makeText(this, "打开相机失败", Toast.LENGTH_SHORT).show();
        }

    }

        @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CAMERA && resultCode == RESULT_OK){

            if (tempFile != null){
                    mImageList.add(tempFile.getAbsolutePath());
            }
        }
    }