How to use the Camera View framework in the Java library

The CameraView framework is an open source framework for realizing the camera function in the Java application.It provides a set of easy -to -use APIs that allow developers to quickly integrate camera functions into their applications.This article will introduce the use of the CameraView framework in the Java class library in detail and provide example code. # Cameraview framework installation The CameraView framework can be added to the Java project through Maven or Gradle.First, you need to add Cameraview dependencies to the project construction file.For Maven project, you can add the following code to the pom.xml file of the project: <dependencies> <dependency> <groupId>com.otaliastudios</groupId> <artifactId>cameraview</artifactId> <version>2.7.0</version> </dependency> </dependencies> For the Gradle project, you can add the following code to the project's built.gradle file: groovy dependencies { implementation 'com.otaliastudios:cameraview:2.7.0' } When you add the corresponding dependencies, you can start using the Cameraview framework. # Create a camera preview view First, you need to add a Cameraview to your layout file as a preview view of the camera.You can use the following code to create a Cameraview: CameraView cameraView = new CameraView(context); Then you need to add Cameraview to the appropriate position in your layout view.You can use the following code to add Cameraview to a Framelayout: FrameLayout frameLayout = findViewById(R.id.frameLayout); frameLayout.addView(cameraView); # Open the camera and start preview Once CameraView is created, you can use the following code to open the camera and start preview: cameraView.open(); cameraView.start(); This will open the default camera on the device and display preview images in Cameraview. # Photograph With the CameraView framework, you can easily implement the camera function.You can use the following code to take pictures: cameraView.capturePicture(); cameraView.addCameraListener(new CameraListener() { @Override public void onPictureTaken(byte[] picture) { // Treat the photos taken } }); In the code in the code, you can handle the photos taken.You can save it to the local file system or display it in other parts of the application. # Switch camera The Cameraview framework also allows you to switch between the front camera and the rear camera.You can use the following code to switch the camera: cameraView.toggleFacing(); Calling the `ToggleFacing` method will switch between the front camera and the rear camera. # End preview and release camera resources When your application no longer needs a camera, you need to end the preview and release the camera resources.You can use the following code to do this: cameraView.stop(); cameraView.close(); The `Stop` method will stop preview, and the` Close` method will release camera resources. This is the basic usage of the Cameraview framework in the Java class library.By using the CameraView framework, you can easily integrate the camera function into your Java application. The example code is as follows: import android.os.Bundle; import android.support.v7.app.AppCompatActivity; public class MainActivity extends AppCompatActivity { private CameraView cameraView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); cameraView = findViewById(R.id.cameraView); cameraView.open(); cameraView.start(); } @Override protected void onDestroy() { super.onDestroy(); cameraView.stop(); cameraView.close(); } } <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/frameLayout" android:layout_width="match_parent" android:layout_height="match_parent"> <com.otaliastudios.cameraview.CameraView android:id="@+id/cameraView" android:layout_width="match_parent" android:layout_height="match_parent"/> </FrameLayout> By using the CameraView framework, you can easily implement the camera function, such as taking pictures, switching cameras, etc.You can customize and expand the Cameraview framework according to your needs to meet your specific application needs.