SurfaceView预览camera

贺祥 | 发表于 | 分类于

SurfaceView 预览Camera
实现步骤

1.增加权限
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<uses-permission android:name="android.permission.CAMERA"/>
2.动态申请权限
//检查访问摄像头权限
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, 100);
} else {
    //拥有权限
    initCameraView();
}
3.为SurfaceView的SurfaceHolder增加回调

类中要实现回调 implements SurfaceHolder.Callback

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private void initCameraView() {
    surfaceView = findViewById(R.id.surfaceview);
    surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(this);
}
4.Camera相机初始化并关联SurfaceHolder

记得加上这句camera.startPreview()

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@Override
  public void surfaceCreated(final SurfaceHolder holder) {

      new Thread(new Runnable() {
          @Override
          public void run() {
              try {
                  if (camera == null)
                      camera = Camera.open(1);
                  camera.setPreviewDisplay(holder);
                  camera.setPreviewCallback(new Camera.PreviewCallback() {
                      @Override
                      public void onPreviewFrame(byte[] data, Camera camera) {
                      }
                  });
                  camera.setDisplayOrientation(90);
                  camera.startPreview();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
      }).start();

  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {

  }