tcw165

extern "C" JNIEXPORT jbyteArray JNICALL
JNI_METHOD(detectFacesAndLandmarks)(JNIEnv *env,
                                    jobject thiz,
                                    jobject bitmap) {
    if (sFaceDetector.num_detectors() == 0) {
        LOGI("L%d: sFaceDetector is not initialized!", __LINE__);
        throwException(env, "sFaceDetector is not initialized!");
        return NULL;
    }
    if (sFaceLandmarksDetector.num_parts() == 0) {

tcw165

public class FaceLandmarksDetector68 {

    public FaceLandmarksDetector68() {
        // Load STL library.
        try {
            System.loadLibrary("c++_shared");
            Log.d("jni", "libc++_shared.so is loaded");
        } catch (UnsatisfiedLinkError error) {
            throw new RuntimeException(
                "\"c++_shared\" not found; check that the correct native " +

tcw165

// Activity or Fragment ::onResume
// 1. Wait for the surface ready.
mTextureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture texture,
                                          int width, int height) {
        
        // 2. Open the camera.
        manager.openCamera(
            cameraId,

tcw165

// 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.

tcw165

<resources xmlns:tools="http://schemas.android.com/tools">
    
    <!-- Transparent Window Activity -->
    <style name="AppTheme.TransparentWindow" parent="AppTheme.CustomToolbar">
        <!--
        We want the translucent background painted by the root layout instead
        of painted by the window.
        -->
        <item name="android:windowIsTranslucent">true</item>
        

tcw165

// Hold the disposable in order to cancel the operation later.
val sharingDisposable = mView
    .onClickStart()
    .switchMap { _ ->
        // 1. Generate BMP
        getGenBmpObservable()
            // 2. Show dialog
            .switchMap { _ -> 
                getDialogSingle().toObservable()
            }

tcw165

private val mDisposablesOnCreate = CompositeDisposable()

private val INTENT_OF_DO_SOMETHING      = 0
private val INTENT_OF_CANCEL_EVERYTHING = 1

// Activity onCreate().
override fun onCreate() {
    // Share and cancel input:
    //
    //   start +

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private fun toShareAction(): Observable<ShareProgressState> {
    // 1. Generate BMP
    return getGenBmpObservable()
        // 2. Show dialog
        .switchMap { _ -> 
            getDialogSingle()
                .toObservable()
        }
        // 3. Share
        .switchMap { dialogPayload -> 

tcw165

// This is the snippet of SwitchMapObserver code.

// 1. The inner observer #1 's onNext, this function is called when it 
// receives the data from upstream.
@Override
public void onNext(T t) {
    long c = unique + 1;
    unique = c;

    // 2. Cancel (dispose) the given Observable from your mapper funtion.

tcw165

public int largestRectanglularAreaInHistogram(int[] hist) {
    int maxArea = 0;

    // Iterate through the histogram.
    for (int i = 0; i < hist.length; ++i) {
        int h = hist[i];

        maxArea = Math.max(maxArea, h);

        for (int j = i - 1; j >= 0; --j) {