Android应用程序重复拒绝权限

我正在开发一款 Android应用.该应用程序具有读取QR码的功能(这是迄今为止唯一已实现的功能).
我正在Android studio上开发应用程序.
一旦我将应用程序安装到我的Android手机上,就表示许可被拒绝. (已经为应用程序实现了请求权限,并且“权限被拒绝”是我在安装权限被拒绝的情况下放入Android应用程序的自定义消息.).

我可以在手机上手动授予应用程序权限.当我这样做时,它表示允许的权限,并且一秒钟可以访问摄像机但是“Permission Denied”消息开始重复出现并且摄像机输入丢失.

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://scheR_631_11845@as.android.com/apk/res/android"
    package="com.example.folio" >

    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.camera.autofocus"/>

    <application
        android:allowBACkup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@String/app_name"
        android:rounDicon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

@H_714_7@mainActivity.java

package com.example.folio;
import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.net.Uri;
import android.os.build;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.bundle;
import android.widget.Toast;


import com.google.zxing.Result;

import me.dm7.barcodescAnner.zxing.ZXingScAnnerView;
//import sun.applet.Main;

public class MainActivity extends AppCompatActivity implements ZXingScAnnerView.ResultHandler {

    private static final int requEST_CAMERA=1;
    private ZXingScAnnerView scAnnerView;

    @Override
    protected void onCreate(Bundle savedInstanceStatE) {
        super.onCreate(savedInstanceStatE);
        scAnnerView=new ZXingScAnnerView(this);
        setContentView(scAnnerView);

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODEs.M)
        {
            if(checkPermission())
            {
                Toast.makeText(MainActivity.this,"Permission granted!",Toast.LENGTH_LONG).show();
            }
            else
            {
                requestPermission();
            }
        }
    }

    private Boolean checkPermission()
    {
        return (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.CAMERA)== PackageManager.PERMISSION_GRANTED);
    }
    private void requestPermission()
    {
        ActivityCompat.requestPermissions(this,new String[]{CAMERA_serviCE},requEST_CAMERA);
    }

    public void onrequestPermissionsResult(int requestCode,String permission[],int grantResults[])
    {
        switch(requestCodE)
        {
            case requEST_CAMERA:
                if(grantResults.length>0)
                {
                    Boolean cameraAccepted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                    if(cameraAccepted)
                    {
                        Toast.makeText(MainActivity.this,"Permission Granted!",Toast.LENGTH_LONG).show();
                    }
                    else
                    {
                        Toast.makeText(MainActivity.this,"Permission Denied!",Toast.LENGTH_LONG).show();
                        if(Build.VERSION.SDK_INT >= Build.VERSION_CODEs.M)
                        {
                            if(shouldShowrequestPermissionRationale(CAMERA_serviCE))
                            {
                                displayAlertmessage("Please allow access!",new DialogInterface.onClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog,int which) {
                                        requestPermissions(new String[]{CAMERA_serviCE},requEST_CAMERA);
                                    }
                                });
                                return;
                            }
                        }
                    }
                }
                break;
        }
    }
    @Override
    public void onResume()
    {
        super.onResume();
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODEs.M)
        {
            if(checkPermission())
            {
                if(scAnnerView==null)
                {
                    scAnnerView=new ZXingScAnnerView(this);
                    setContentView(scAnnerView);
                }
                scAnnerView.setResultHandler(this);
                scAnnerView.startCamera();
            }
            {
                requestPermission();
            }
        }
    }

    @Override
    public void onDestroy()
    {
        super.onDestroy();
        scAnnerView.stopCamera();
    }

    public void displayAlertmessage(String message,DialogInterface.onClickListener listener)
    {
        new AlertDialog.builder(MainActivity.this)
                .setmessage(messagE)
                .setPositiveButton("Ok",listener)
                .setNegativeButton("Cancel",null)
                .create()
                .show();
    }


    @Override
    public void handleResult(Result result) {
        final String scanResult=result.getText();
        AlertDialog.builder builder=new AlertDialog.builder(this);
        builder.settitle("Scan result");
        builder.setPositiveButton("Ok",new DialogInterface.onClickListener() {
            @Override
            public void onClick(DialogInterface dialog,int which) {
                scAnnerView.resumeCameraPreview(MainActivity.this);

            }
        });
        builder.setNeutralButton("Visit",int which) {
                Intent intent = new Intent(Intent.ACTION_VIEW,Uri.parse(scanResult));
                startActivity(intent);

            }
        });
        builder.setmessage(scanResult);
        AlertDialog alert=builder.create();
        alert.show();
    }
}
``````````````````````````````````````````````````````````````````````

ActivityCompat.requestPermissions(this,requEST_CAMERA);

ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA},requEST_CAMERA);