android previewview怎样启用 - 问答

在Android中，要启用PreviewView，您需要遵循以下步骤：

首先，确保您的项目已经导入了androidx.camera2:camera-core和androidx.camera2:camera-preview库。在app的build.gradle文件中添加以下依赖项：

dependencies {
    implementation 'androidx.camera2:camera-core:1.0.0'
    implementation 'androidx.camera2:camera-preview:1.0.0'
}

在布局文件（例如activity_main.xml）中，添加一个TextureView来显示预览：

<TextureView
    android:id="@+id/previewView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

在Activity（例如MainActivity.java）中，初始化CameraProvider和Preview：

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.graphics.ImageFormat;
import android.os.Bundle;
import android.view.TextureView;

import androidx.annotation.NonNull;
import androidx.camera2.core.CameraSelector;
import androidx.camera2.core.ImageAnalysis;
import androidx.camera2.core.ImageProxy;
import androidx.camera2.core.Preview;
import androidx.camera2.core.SurfaceTextureProvider;
import androidx.camera2.core.UseCase;
import androidx.camera2.core.VideoCapture;
import androidx.camera2.core.VideoCaptureConfig;
import androidx.camera2.ext.core.ImageAnalysisExtensions;
import androidx.camera2.ext.core.ImageProxyExtensions;
import androidx.camera2.ui.PreviewView;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.core.VideoCaptureConfig;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.core.SurfaceTextureProvider;
import androidx.camera.core.VideoCapture;
import androidx.camera.

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