CameraX can't initialize

Question

I try to use CameraView. And I'm a beginner in Android. I read some articles and information on class but I am not able to make it works. I have the following errors :

Caused by: java.lang.IllegalStateException: CameraX is not initialized properly. Either CameraX.initialize() needs to have been called or the CameraXConfig.Provider interface must be implemented by your Application class

Here is my code :

activity_main.xml

   <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:theme="@style/AppTheme">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World!"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<androidx.camera.view.CameraView
    android:id="@+id/view_camera"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

MainActivity.java:

    package com.example.myapplication;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.camera2.Camera2Config;
import androidx.camera.core.CameraX;
import androidx.camera.core.CameraXConfig;
import androidx.camera.core.impl.CameraFactory;
import androidx.camera.core.impl.PreviewConfig;
import androidx.camera.view.CameraView;

import android.os.Bundle;


public class MainActivity extends AppCompatActivity implements CameraXConfig.Provider {

    private CameraView view_camera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        view_camera = findViewById(R.id.view_camera);
        view_camera.bindToLifecycle(this);
    }

    @NonNull
    @Override
    public CameraXConfig getCameraXConfig() {
        return Camera2Config.defaultConfig();
    }
}

And the manifest :

<?xml version="1.0" encoding="utf-8"?>

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

<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>

The gradle file for app:

    apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.1"
    defaultConfig {
        applicationId "com.example.myapplication"
        minSdkVersion 26
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    def camerax_version = "1.0.0-alpha10"// Add the CameraX core dependency implementation
    implementation "androidx.camera:camera-core:${camerax_version}"// Add the CameraX Camera2 API interop support dependency
    implementation "androidx.camera:camera-camera2:${camerax_version}"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation "androidx.camera:camera-view:1.0.0-alpha06"
    // If you want to use the CameraX Extensions library
    implementation "androidx.camera:camera-extensions:1.0.0-alpha06"
    // If you want to use the CameraX Lifecycle library
    implementation "androidx.camera:camera-lifecycle:1.0.0-alpha03"
}

Thanks for your help.

Answer 1

I faced the same issue with the latest alpha11 cameraX library, so downgraded to

// CameraX View class
    implementation "androidx.camera:camera-view:1.0.0-alpha10"

Also added the camera info parameter

preview?.setSurfaceProvider(viewFinder.createSurfaceProvider(camera?.cameraInfo))

Answer 2

None of the solutions from here worked for me, and I'm on 1.0.0-beta08 version of CameraX. What worked for me was to make sure that I'm calling the statement

Preview.Builder()
    .build()
    .also {
        it.setSurfaceProvider(viewFinder.createSurfaceProvider())
    }

after the future from ProcessCameraProvider.getInstance(context) gets resolved.

So while I was trying to save a reference to the preview in the fragment, I ended up with something like this:

private fun startCamera() {
    val context = requireContext()
    val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
    cameraProviderFuture.addListener({
        val cameraProvider = cameraProviderFuture.get()

        val cameraSelector = CameraSelector.Builder()
            .requireLensFacing(CameraSelector.LENS_FACING_BACK)
            .build()

        val preview = Preview.Builder()
            .build()
            .also {
                it.setSurfaceProvider(viewFinder.createSurfaceProvider())
            }

        cameraProvider.bindToLifecycle(this, cameraSelector, preview)
    }, ContextCompat.getMainExecutor(context))
}