camera2_api_rxjava2_summary.java

// Activity or Fragment ::onResume
mDisposables = new CompositeDisposable();
mDisposables.add(
    grantPermission()
        // Step 1, use TextureViewObservable to wait for the surface ready.
        .compose(waitForTextureSurfaceReady())
        // Step 2, use Camera2Observable to wait for the device opened.
        .compose(openCameraToGetCameraDevice())
        // Step 3, use Camera2CaptureSessionObservable and Camera2ImageReaderObservable
        // to wait for the session configured.
        .compose(createCaptureSession())
        // Step 4, create a repeated capture request.
        .compose(setCaptureRequestAndObserveAvailableImage())
        // Then do whatever you want here.
        .subscribe());

// Activity or Fragment ::onPause
mDisposables.clear();