启动相机android studio

Question

早上好，

我使用以下代码拍摄照片并在Imageview上显示。

    private static final int CAMERA_REQUEST = 1888;
    public void OpenCamera(){
        AddImage.setOnClickListener(
                new View.OnClickListener(){
                    @Override
                    public void onClick(View v){
                        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                        startActivityForResult(cameraIntent, CAMERA_REQUEST);
                    }
                }
        );

    }
    // for getting displaying the picture on the image view
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK) {
            Bitmap photo = (Bitmap) data.getExtras().get("data");
            // to remove the main background and draw the picture
            AddImage.setBackgroundResource(0);
            AddImage.setImageBitmap(photo);
            //Barcode();
        }
    }

一切正常，直到导入'zxing'库为生成的图像生成QR码。但是，我在“清单”中检查了相机权限并且工作正常，许可的代码是：

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

检查它的方法是（它返回true）：

public boolean hasPermissionInManifest(Context context, String permissionName) {
        final String packageName = context.getPackageName();
        try {
            final PackageInfo packageInfo = context.getPackageManager()
                    .getPackageInfo(packageName, PackageManager.GET_PERMISSIONS);
            final String[] declaredPermisisons = packageInfo.requestedPermissions;
            if (declaredPermisisons != null && declaredPermisisons.length > 0) {
                for (String p : declaredPermisisons) {
                    if (p.equals(permissionName)) {
                        return true;
                    }
                }
            }
        } catch (PackageManager.NameNotFoundException e) {

        }
        return false;
    }

现在，当“startActivityForResult（cameraIntent，CAMERA_REQUEST）;”时出现以下错误：被称为：

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: iq.wissam.CoiApp, PID: 3853
                  java.lang.SecurityException: Permission Denial: starting Intent { act=android.media.action.IMAGE_CAPTURE cmp=com.android.camera/.Camera } from ProcessRecord{88f1abb 3853:iq.nazaha.wissam.CoiApp/u0a85} (pid=3853, uid=10085) with revoked permission android.permission.CAMERA
                      at android.os.Parcel.readException(Parcel.java:1683)
                      at android.os.Parcel.readException(Parcel.java:1636)
                      at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:3071)
                      at android.app.Instrumentation.execStartActivity(Instrumentation.java:1518)
                      at android.app.Activity.startActivityForResult(Activity.java:4224)
                      at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50)
                      at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79)
                      at android.app.Activity.startActivityForResult(Activity.java:4183)
                      at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
                      at iq.nazaha.wissam.CoiApp.AddNewItemPage$1.onClick(AddNewItemPage.java:91)
                      at android.view.View.performClick(View.java:5610)
                      at android.view.View$PerformClick.run(View.java:22265)
                      at android.os.Handler.handleCallback(Handler.java:751)
                      at android.os.Handler.dispatchMessage(Handler.java:95)
                      at android.os.Looper.loop(Looper.java:154)
                      at android.app.ActivityThread.main(ActivityThread.java:6077)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

提前致谢。