CameraX Demo

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <uses-feature android:name="android.hardware.camera.any" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
        android:maxSdkVersion="28" />

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.CameraX"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

            <meta-data
                android:name="android.app.lib_name"
                android:value="" />
        </activity>
    </application>

</manifest>

package com.example.camerax;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraManager;
import android.os.Build;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

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

public class MainActivity extends AppCompatActivity {

    private CameraManager mCameraManager;
    private PreviewView previewView;
    private final int REQUEST_CODE_PERMISSIONS = 10;
    private String[] REQUIRED_PERMISSIONS = {Manifest.permission.CAMERA, Manifest.permission.RECORD_AUDIO, ""};


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        previewView = findViewById(R.id.viewFinder);

        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.P) {
            REQUIRED_PERMISSIONS[2] = Manifest.permission.WRITE_EXTERNAL_STORAGE;
        }

        // Request camera permissions
        if (allPermissionsGranted()) {
            startCamera();
        } else {
            ActivityCompat.requestPermissions(
                    this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS);
        }

        // Set up the listeners for take photo and video capture buttons
        findViewById(R.id.image_capture_button).setOnClickListener(v -> {
            takePhoto();
        });
        findViewById(R.id.video_capture_button).setOnClickListener(v -> {
            captureVideo();
        });


    }

    private void captureVideo() {
    }

    private void takePhoto() {
    }

    private void startCamera() {
        ListenableFuture<ProcessCameraProvider> future = ProcessCameraProvider.getInstance(this);
        future.addListener(() -> {
            try {
                ProcessCameraProvider cameraProvider = future.get();
                bindPreView(cameraProvider);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }, ContextCompat.getMainExecutor(this));

    }

    private void bindPreView(ProcessCameraProvider cameraProvider) {
        Preview preview = new Preview.Builder().build();
        cameraProvider.bindToLifecycle(this,  CameraSelector.DEFAULT_BACK_CAMERA, preview);
        preview.setSurfaceProvider(previewView.getSurfaceProvider());
    }



    private boolean allPermissionsGranted() {
        for (int i = 0; i < REQUIRED_PERMISSIONS.length; i++) {
            if (ActivityCompat.checkSelfPermission(this, REQUIRED_PERMISSIONS[i]) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }


    private void init(){
        // 获取摄像头的管理者CameraManager
        mCameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        try {
            String[] cameraIdList = mCameraManager.getCameraIdList();
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }



}