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。