Merge "Limit touch sampling rate for falsing." into qt-dev (a7f63a1c) · Commits · e / os / android_frameworks_base

packages/SystemUI/src/com/android/systemui/classifier/ClassifierData.java

+17 −1

Original line number	Diff line number	Diff line
		@@ -26,6 +26,9 @@ import java.util.ArrayList;
		* example, provide information on the current touch state.
		*/
		public class ClassifierData {
		private static final long MINIMUM_DT_NANOS = 16666666; // 60Hz
		private static final long MINIMUM_DT_SMEAR_NANOS = 2500000; // 2.5ms

		private SparseArray<Stroke> mCurrentStrokes = new SparseArray<>();
		private ArrayList<Stroke> mEndingStrokes = new ArrayList<>();
		private final float mDpi;
		@@ -34,7 +37,18 @@ public class ClassifierData {
		mDpi = dpi;
		}

		public void update(MotionEvent event) {
		/** Returns true if the event should be considered, false otherwise. */
		public boolean update(MotionEvent event) {
		// We limit to 60hz sampling. Drop anything happening faster than that.
		// Legacy code was created with an assumed sampling rate. As devices increase their
		// sampling rate, this creates potentialy false positives.
		if (event.getActionMasked() == MotionEvent.ACTION_MOVE
		&& mCurrentStrokes.size() != 0
		&& event.getEventTimeNano() - mCurrentStrokes.get(0).getLastEventTimeNano()
		< MINIMUM_DT_NANOS - MINIMUM_DT_SMEAR_NANOS) {
		return false;
		}

		mEndingStrokes.clear();
		int action = event.getActionMasked();
		if (action == MotionEvent.ACTION_DOWN) {
		@@ -54,6 +68,8 @@ public class ClassifierData {
		mEndingStrokes.add(getStroke(id));
		}
		}

		return true;
		}

		public void cleanUp(MotionEvent event) {

+3 −1

Original line number	Diff line number	Diff line
		@@ -151,7 +151,9 @@ public class HumanInteractionClassifier extends Classifier {
		}

		private void addTouchEvent(MotionEvent event) {
		mClassifierData.update(event);
		if (!mClassifierData.update(event)) {
		return;
		}

		for (StrokeClassifier c : mStrokeClassifiers) {
		c.onTouchEvent(event);

+8 −0

Original line number	Diff line number	Diff line
		@@ -68,4 +68,12 @@ public class Stroke {
		public ArrayList<Point> getPoints() {
		return mPoints;
		}

		public long getLastEventTimeNano() {
		if (mPoints.isEmpty()) {
		return mStartTimeNano;
		}

		return mPoints.get(mPoints.size() - 1).timeOffsetNano;
		}
		}