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Use reflection to detect stylus via com.htc.pen.PenEvent #5

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Use reflection to detect stylus via com.htc.pen.PenEvent #5

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cef544e
Use reflection to detect stylus via com.htc.pen.PenEvent
chiuki Jan 31, 2014
abd64b8
Merge remote-tracking branch 'upstream/master'
chiuki Mar 17, 2014
162977f
Cache class and method lookup in static block to reduce reflection
chiuki Mar 17, 2014
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45 changes: 36 additions & 9 deletions src/com/google/android/apps/markers/Slate.java
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
package com.google.android.apps.markers;

import java.util.ArrayList;
import java.lang.reflect.Method;

import android.annotation.SuppressLint;
import android.app.ActivityManager;
Expand Down Expand Up @@ -124,6 +125,21 @@ public class Slate extends View {
private int mMemClass;
private boolean mLowMem;

private static Class<?> sHTCPenEventClass = null;
private static Method sHTCIsPenEventMethod = null;
static {
if ("HTC".equalsIgnoreCase(Build.MANUFACTURER) &&
Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
try {
sHTCPenEventClass = Class.forName(
"com.htc.pen.PenEvent");
sHTCIsPenEventMethod = sHTCPenEventClass.getDeclaredMethod(
"isPenEvent", MotionEvent.class);
} catch (Exception e) {
}
}
}

public interface SlateListener {
void strokeStarted();
void strokeEnded();
Expand Down Expand Up @@ -863,20 +879,31 @@ final static int getToolTypeCompat(MotionEvent me, int index) {
if (hasToolType()) {
return me.getToolType(index);
}

// dirty hack for the HTC Flyer
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
if ("flyer".equals(Build.HARDWARE)) {
if (me.getSize(index) <= 0.1f) {
// with very high probability this is the stylus
return MotionEvent.TOOL_TYPE_STYLUS;
}
}

if (isHTCPenEvent(me)) {
return MotionEvent.TOOL_TYPE_STYLUS;
}

return MotionEvent.TOOL_TYPE_FINGER;
}

/**
* Use reflection to determine if this is a pen event from certain HTC
* devices such as the Flyer and Jetstream.
*/
private static boolean isHTCPenEvent(MotionEvent me) {
if (sHTCPenEventClass == null || sHTCIsPenEventMethod == null) {
return false;
}

try {
return (Boolean) sHTCIsPenEventMethod.invoke(sHTCPenEventClass, me);
} catch (Exception e) {
}

return false;
}

PointF getCenter(MotionEvent event, PointF out) {
int P = event.getPointerCount();
PointF pt = ((out == null) ? new PointF() : out);
Expand Down