CameraX 采集

2022-10-25 16:34:50 浏览数 (1)

本篇介绍

回顾下Camera1,使用起来需要开发关注很多细节,Camera2可以帮助开发自动处理很多细节,可是使用上就特别复杂,Android就提供了Camerax,既简单又好用,本篇介绍下使用方法。

使用步骤

  1. 申请权限
代码语言:javascript复制
 <uses-permission android:name="android.permission.CAMERA" />

动态申请:

代码语言:javascript复制
 private void requestPermission() {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
            return;
        }
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, CAMERA_REQUEST_CODE);
    }
  1. 打开Camera:
代码语言:javascript复制
mCameraProviderFuture = ProcessCameraProvider.getInstance(this);
        mCameraProviderFuture.addListener(new Runnable() {
            @Override
            public void run() {
                try {
                    ProcessCameraProvider cameraProvider = mCameraProviderFuture.get();

                    Preview preview = new Preview.Builder().build();
                    ImageAnalysis imageAnalysis =
                            new ImageAnalysis.Builder().setTargetResolution(new Size(1280, 720)).build();
                    CameraSelector cameraSelector = CameraSelector.Builder.fromSelector(CameraSelector.DEFAULT_FRONT_CAMERA).build();

                    cameraProvider.unbind();
                    cameraProvider.bindToLifecycle(MainActivity.this, cameraSelector, imageAnalysis, preview);
                    preview.setSurfaceProvider(mPreview.getSurfaceProvider());

                } catch (ExecutionException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, ContextCompat.getMainExecutor(this));

这就是打开Camera,并且将采集数据渲染出来的全部代码了,很简单。

  1. 关闭Camera:
代码语言:javascript复制
   try {
            mCameraProviderFuture.get().shutdown();
        } catch (ExecutionException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

工程代码路径

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