阅读量:0
PreviewView是Android Jetpack CameraX库中用于预览相机图像的视图组件,配合CameraX可以实现相机预览功能。下面是一个简单的示例代码,演示如何使用PreviewView和CameraX配合实现相机预览:
// 创建预览用的PreviewView组件 PreviewView previewView = findViewById(R.id.previewView); // 设置CameraX配置 ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this); // 绑定预览用例 cameraProviderFuture.addListener(() -> { ProcessCameraProvider cameraProvider = cameraProviderFuture.get(); Preview preview = new Preview.Builder().build(); preview.setSurfaceProvider(previewView.getSurfaceProvider()); CameraSelector cameraSelector = new CameraSelector.Builder() .requireLensFacing(CameraSelector.LENS_FACING_BACK) .build(); cameraProvider.unbindAll(); cameraProvider.bindToLifecycle(this, cameraSelector, preview); }, ContextCompat.getMainExecutor(this));
在上面的示例中,我们首先创建了一个PreviewView组件用于显示相机预览图像。然后通过ProcessCameraProvider.getInstance(this)获取CameraX的实例,设置预览用例和相机选择器,最后使用cameraProvider.bindToLifecycle()方法将预览用例绑定到相机的生命周期中。
需要注意的是,使用CameraX库需要在build.gradle文件中添加相应的依赖:
dependencies { def camerax_version = "1.1.0-alpha11" implementation "androidx.camera:camera-core:$camerax_version" implementation "androidx.camera:camera-camera2:$camerax_version" implementation "androidx.camera:camera-lifecycle:$camerax_version" implementation "androidx.camera:camera-view:1.0.0-alpha22" }
以上就是Android PreviewView与CameraX配合实现相机预览功能的简单示例。希望能帮助到你。