android.permission.camera,Problem with the android.permission.CAMERA failure

濮阳和泰

2023-12-01

I'm trying to implement the CameraX preview from the [Android developer site][1] I don't know why I'm getting this error even when I added the permissions in my manifests. When I open the QR scanner activity the preview is just black screen. I have updated to the latest version of cameraX and yet this issue was not solved. It seems that the permission for using camera was not granted. Please help me with it.

package="com.example.two_locally">

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"

android:usesCleartextTraffic="true">

QR scanner.java

package com.example.two_locally;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.WindowManager;

import android.widget.ImageView;

import androidx.annotation.NonNull;

import androidx.appcompat.app.AppCompatActivity;

import androidx.camera.core.Camera;

import androidx.camera.core.CameraSelector;

import androidx.camera.core.Preview;

import androidx.camera.lifecycle.ProcessCameraProvider;

import androidx.camera.view.PreviewView;

import androidx.core.content.ContextCompat;

import androidx.lifecycle.LifecycleOwner;

import com.google.common.util.concurrent.ListenableFuture;

import java.util.concurrent.ExecutionException;

public class QRScanner extends AppCompatActivity {

ImageView back_image;

private ListenableFuture cameraProviderFuture;

PreviewView previewView;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_q_r_scanner);

back_image = findViewById(R.id.back_img);

previewView= findViewById(R.id.viewFinder);

cameraProviderFuture = ProcessCameraProvider.getInstance(this);

Log.i("Camerax", "preview view set up");

back_image.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Intent r = new Intent(QRScanner.this, Dashbord.class);

startActivity(r);

finish();

}

});

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

cameraProviderFuture.addListener(() -> {

try {

ProcessCameraProvider cameraProvider = cameraProviderFuture.get();

Log.i("Camerax", "The CameraProvider is working now in try");

bindPreview(cameraProvider);

} catch (ExecutionException | InterruptedException e) {

// No errors need to be handled for this Future.

// This should never be reached.

Log.i("Camerax", "The Camerax catch portion");

e.printStackTrace();

}

}, ContextCompat.getMainExecutor(this));

}

void bindPreview(@NonNull ProcessCameraProvider cameraProvider) {

Preview preview = new Preview.Builder()

.build();

CameraSelector cameraSelector = new CameraSelector.Builder()

.requireLensFacing(CameraSelector.LENS_FACING_BACK)

.build();

preview.setSurfaceProvider(previewView.getSurfaceProvider());

Log.i("Camerax", "bindPreview is working");

Camera camera = cameraProvider.bindToLifecycle((LifecycleOwner)this, cameraSelector, preview);

}

Error messages

```1 890-7480/? W/ServiceManager: Permission failure: android.permission.CAMERA from uid=10269 pid=2714

2020-12-08 14:29:28.262 890-7480/? E/CameraService: Permission Denial: can't use the camera pid=2714, uid=10269

2020-12-08 14:29:28.263 2714-3336/com.example.cameraApp E/SequentialExecutor: Exception while executing runnable androidx.camera.camera2.internal.-$$Lambda$Camera2CameraImpl$uJgH7DGqogXqd1JLV8-47UNTCjM@a1e8d7d

java.lang.SecurityException: validateClientPermissionsLocked:1251: Caller "com.example.cameraApp" (PID 10269, UID 2714) cannot open camera "0" without camera permission

at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:827)

at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:440)

at android.hardware.camera2.CameraManager.openCameraForUid(CameraManager.java:622)

at android.hardware.camera2.CameraManager.openCamera(CameraManager.java:590)

at androidx.camera.camera2.internal.compat.CameraManagerCompatApi29Impl.openCamera(CameraManagerCompatApi29Impl.java:44)

at androidx.camera.camera2.internal.compat.CameraManagerCompat.openCamera(CameraManagerCompat.java:203)

at androidx.camera.camera2.internal.Camera2CameraImpl.openCameraDevice(Camera2CameraImpl.java:906)

at androidx.camera.camera2.internal.Camera2CameraImpl.openInternal(Camera2CameraImpl.java:242)

at androidx.camera.camera2.internal.Camera2CameraImpl.tryAttachUseCases(Camera2CameraImpl.java:709)

at androidx.camera.camera2.internal.Camera2CameraImpl.lambda$attachUseCases$11$Camera2CameraImpl(Camera2CameraImpl.java:653)

at androidx.camera.camera2.internal.-$$Lambda$Camera2CameraImpl$uJgH7DGqogXqd1JLV8-47UNTCjM.run(Unknown Source:4)

at androidx.camera.core.impl.utils.executor.SequentialExecutor$QueueWorker.workOnQueue(SequentialExecutor.java:229)

at androidx.camera.core.impl.utils.executor.SequentialExecutor$QueueWorker.run(SequentialExecutor.java:171)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)

at java.lang.Thread.run(Thread.java:919)

Caused by: android.os.ServiceSpecificException: validateClientPermissionsLocked:1251: Caller "com.example.two_locally" (PID 10269, UID 2714) cannot open camera "0" without camera permission (code 1)

at android.os.Parcel.createException(Parcel.java:2101)

at android.os.Parcel.readException(Parcel.java:2055)

at android.os.Parcel.readException(Parcel.java:2003)

at android.hardware.ICameraService$Stub$Proxy.connectDevice(ICameraService.java:583)

at android.hardware.camera2.CameraManager.openCameraDeviceUserAsync(CameraManager.java:403)