Example usage for android.view ViewGroup setOnSystemUiVisibilityChangeListener

Introduction

In this page you can find the example usage for android.view ViewGroup setOnSystemUiVisibilityChangeListener.

Prototype

public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l)

Source Link

Document

Set a listener to receive callbacks when the visibility of the system bar changes.

Usage

From source file:com.affectiva.affdexme.MainActivity.java

void initializeUI() {

    //Get handles to UI objects
    ViewGroup activityLayout = (ViewGroup) findViewById(android.R.id.content);
    progressBarLayout = (RelativeLayout) findViewById(R.id.progress_bar_cover);
    permissionsUnavailableLayout = (LinearLayout) findViewById(R.id.permissionsUnavialableLayout);
    metricViewLayout = (RelativeLayout) findViewById(R.id.metric_view_group);
    leftMetricsLayout = (LinearLayout) findViewById(R.id.left_metrics);
    rightMetricsLayout = (LinearLayout) findViewById(R.id.right_metrics);
    mainLayout = (RelativeLayout) findViewById(R.id.main_layout);
    fpsPct = (TextView) findViewById(R.id.fps_value);
    fpsName = (TextView) findViewById(R.id.fps_name);
    cameraView = (SurfaceView) findViewById(R.id.camera_preview);
    drawingView = (DrawingView) findViewById(R.id.drawing_view);
    settingsButton = (ImageButton) findViewById(R.id.settings_button);
    cameraButton = (ImageButton) findViewById(R.id.camera_button);
    screenshotButton = (ImageButton) findViewById(R.id.screenshot_button);
    progressBar = (ProgressBar) findViewById(R.id.progress_bar);
    pleaseWaitTextView = (TextView) findViewById(R.id.please_wait_textview);
    Button retryPermissionsButton = (Button) findViewById(R.id.retryPermissionsButton);

    //Initialize views to display metrics
    metricNames = new TextView[NUM_METRICS_DISPLAYED];
    metricNames[0] = (TextView) findViewById(R.id.metric_name_0);
    metricNames[1] = (TextView) findViewById(R.id.metric_name_1);
    metricNames[2] = (TextView) findViewById(R.id.metric_name_2);
    metricNames[3] = (TextView) findViewById(R.id.metric_name_3);
    metricNames[4] = (TextView) findViewById(R.id.metric_name_4);
    metricNames[5] = (TextView) findViewById(R.id.metric_name_5);
    metricDisplays = new MetricDisplay[NUM_METRICS_DISPLAYED];
    metricDisplays[0] = (MetricDisplay) findViewById(R.id.metric_pct_0);
    metricDisplays[1] = (MetricDisplay) findViewById(R.id.metric_pct_1);
    metricDisplays[2] = (MetricDisplay) findViewById(R.id.metric_pct_2);
    metricDisplays[3] = (MetricDisplay) findViewById(R.id.metric_pct_3);
    metricDisplays[4] = (MetricDisplay) findViewById(R.id.metric_pct_4);
    metricDisplays[5] = (MetricDisplay) findViewById(R.id.metric_pct_5);

    //Load Application Font and set UI Elements to use it
    Typeface face = Typeface.createFromAsset(getAssets(), "fonts/Square.ttf");
    for (TextView textView : metricNames) {
        textView.setTypeface(face);//w w w  .  ja v  a 2s .  c  o m
    }
    for (MetricDisplay metricDisplay : metricDisplays) {
        metricDisplay.setTypeface(face);
    }
    fpsPct.setTypeface(face);
    fpsName.setTypeface(face);
    drawingView.setTypeface(face);
    pleaseWaitTextView.setTypeface(face);

    //Hide left and right metrics by default (will be made visible when face detection starts)
    leftMetricsLayout.setAlpha(0);
    rightMetricsLayout.setAlpha(0);

    /**
     * This app uses two SurfaceView objects: one to display the camera image and the other to draw facial tracking dots.
     * Since we want the tracking dots to appear over the camera image, we use SurfaceView.setZOrderMediaOverlay() to indicate that
     * cameraView represents our 'media', and drawingView represents our 'overlay', so that Android will render them in the
     * correct order.
     */
    drawingView.setZOrderMediaOverlay(true);
    cameraView.setZOrderMediaOverlay(false);

    //Attach event listeners to the menu and edit box
    activityLayout.setOnTouchListener(this);

    //Attach event listerner to drawing view
    drawingView.setEventListener(this);

    /*
     * This app sets the View.SYSTEM_UI_FLAG_HIDE_NAVIGATION flag. Unfortunately, this flag causes
     * Android to steal the first touch event after the navigation bar has been hidden, a touch event
     * which should be used to make our menu visible again. Therefore, we attach a listener to be notified
     * when the navigation bar has been made visible again, which corresponds to the touch event that Android
     * steals. If the menu bar was not visible, we make it visible.
     */
    activityLayout.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
        @Override
        public void onSystemUiVisibilityChange(int uiCode) {
            if ((uiCode == 0) && (!isMenuVisible)) {
                setMenuVisible(true);
            }

        }
    });

    retryPermissionsButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            requestCameraPermissions();
        }
    });
}