android.view.Display#getRefreshRate ( )源码实例Demo

/** Returns whether now is an appropriate time to perform animations. */
private boolean shouldAnimate() {
    if (!mAnimationEnabled) {
        return false;
    }
    Display display = currentDisplay();
    if (display == null) {
        return false;
    }
    if (mVisibleStartTime <= 0) {
        return false;
    }
    long threshold = (long) (1000 / display.getRefreshRate());
    long millisVisible = elapsedRealtime() - mVisibleStartTime;
    return millisVisible > threshold;
}
 

private void updateDefaultDisplayRefreshRateParams() {
  // Note: If we fail to update the parameters, we leave them set to their previous values.
  Display defaultDisplay = windowManager.getDefaultDisplay();
  if (defaultDisplay != null) {
    double defaultDisplayRefreshRate = defaultDisplay.getRefreshRate();
    vsyncDurationNs = (long) (C.NANOS_PER_SECOND / defaultDisplayRefreshRate);
    vsyncOffsetNs = (vsyncDurationNs * VSYNC_OFFSET_PERCENTAGE) / 100;
  }
}
 

private void updateDefaultDisplayRefreshRateParams() {
  // Note: If we fail to update the parameters, we leave them set to their previous values.
  Display defaultDisplay = windowManager.getDefaultDisplay();
  if (defaultDisplay != null) {
    double defaultDisplayRefreshRate = defaultDisplay.getRefreshRate();
    vsyncDurationNs = (long) (C.NANOS_PER_SECOND / defaultDisplayRefreshRate);
    vsyncOffsetNs = (vsyncDurationNs * VSYNC_OFFSET_PERCENTAGE) / 100;
  }
}
 

private void updateDefaultDisplayRefreshRateParams() {
  // Note: If we fail to update the parameters, we leave them set to their previous values.
  Display defaultDisplay = windowManager.getDefaultDisplay();
  if (defaultDisplay != null) {
    double defaultDisplayRefreshRate = defaultDisplay.getRefreshRate();
    vsyncDurationNs = (long) (C.NANOS_PER_SECOND / defaultDisplayRefreshRate);
    vsyncOffsetNs = (vsyncDurationNs * VSYNC_OFFSET_PERCENTAGE) / 100;
  }
}
 

public void init(Context context, FrameDataCallback callback) {
    // getInstance our choreographer callback and register it
    fpsFrameCallback = new FPSFrameCallback(fpsConfig, callback);
    Choreographer.getInstance().postFrameCallback(fpsFrameCallback);
    Display display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    fpsConfig.deviceRefreshRateInMs = 1000f / display.getRefreshRate();
    fpsConfig.refreshRate = display.getRefreshRate();
}
 

/**
 * Obtains the approximate refresh time, in nanoseconds, of the default display associated
 * with the activity.
 * <p>
 * The actual refresh rate can vary slightly (e.g. 58-62fps on a 60fps device).
 */
public static long getDisplayRefreshNsec(Activity activity) {
    Display display = ((WindowManager)
            activity.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    double displayFps = display.getRefreshRate();
    long refreshNs = Math.round(1000000000L / displayFps);
    Log.d(TAG, "refresh rate is " + displayFps + " fps --> " + refreshNs + " ns");
    return refreshNs;
}
 

private void updateDefaultDisplayRefreshRateParams() {
  // Note: If we fail to update the parameters, we leave them set to their previous values.
  Display defaultDisplay = windowManager.getDefaultDisplay();
  if (defaultDisplay != null) {
    double defaultDisplayRefreshRate = defaultDisplay.getRefreshRate();
    vsyncDurationNs = (long) (C.NANOS_PER_SECOND / defaultDisplayRefreshRate);
    vsyncOffsetNs = (vsyncDurationNs * VSYNC_OFFSET_PERCENTAGE) / 100;
  }
}
 

/**
 * Obtains the approximate refresh time, in nanoseconds, of the default display associated
 * with the activity.
 * <p>
 * The actual refresh rate can vary slightly (e.g. 58-62fps on a 60fps device).
 */
public static long getDisplayRefreshNsec(Activity activity) {
    Display display = ((WindowManager)
            activity.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    double displayFps = display.getRefreshRate();
    long refreshNs = Math.round(1000000000L / displayFps);
    Log.d(TAG, "refresh rate is " + displayFps + " fps --> " + refreshNs + " ns");
    return refreshNs;
}
 

private void updateDefaultDisplayRefreshRateParams() {
  // Note: If we fail to update the parameters, we leave them set to their previous values.
  Display defaultDisplay = windowManager.getDefaultDisplay();
  if (defaultDisplay != null) {
    double defaultDisplayRefreshRate = defaultDisplay.getRefreshRate();
    vsyncDurationNs = (long) (C.NANOS_PER_SECOND / defaultDisplayRefreshRate);
    vsyncOffsetNs = (vsyncDurationNs * VSYNC_OFFSET_PERCENTAGE) / 100;
  }
}
 

/**
 * The natural screen refresh rate, in hertz. May not always return the same value if a display
 * has a dynamic refresh rate.
 */
public static float getDisplayRefreshRate(@NonNull Context context) {
  Display display = ServiceUtil.getWindowManager(context).getDefaultDisplay();
  return display.getRefreshRate();
}
 

/**
 * configures the fpsConfig to the device's hardware
 * refreshRate ex. 60fps and deviceRefreshRateInMs ex. 16.6ms
 * @param context
 */
private void setFrameRate(Context context){
    Display display = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    fpsConfig.deviceRefreshRateInMs = 1000f/display.getRefreshRate();
    fpsConfig.refreshRate = display.getRefreshRate();
}
 

/**
 * configures the fpsConfig to the device's hardware
 * refreshRate ex. 60fps and deviceRefreshRateInMs ex. 16.6ms
 * @param context
 */
private void setFrameRate(Context context){
    Display display = ((WindowManager)context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
    fpsConfig.deviceRefreshRateInMs = 1000f/display.getRefreshRate();
    fpsConfig.refreshRate = display.getRefreshRate();
}