MotionEventLogUitl.java

package com.pinecone.technology.mcommerce.learning.android.chapter11.single;

import android.os.Build;
import android.util.Log;
import android.view.MotionEvent;

public class MotionEventLogUitl {
	private static int os;
	static {
		try {
			os = Build.VERSION.SDK_INT;
		} catch (Exception e) {
			Log.v("Demo", "Exception is: " + e);
			os = 3;
		}
	}

	public static String describeEvent(MotionEvent event) {
		StringBuilder result = new StringBuilder(500);
		result.append("Action: ").append(event.getAction()).append("\n");
		int numPointers = event.getPointerCount();
		result.append("Number of pointers: ").append(numPointers).append("\n");
		if (os >= 9) // Introduced in Android 2.3
			result.append("Event source: ").append(event.getSource())
					.append("\n");
		int ptrIdx = 0;
		while (ptrIdx < numPointers) {
			int ptrId = event.getPointerId(ptrIdx);
			result.append("Pointer Index: ").append(ptrIdx);
			result.append(", Pointer Id: ").append(ptrId).append("\n");
			result.append("   Location: ").append(event.getX(ptrIdx));
			result.append(" x ").append(event.getY(ptrIdx)).append("\n");
			result.append("   Pressure: ").append(event.getPressure(ptrIdx));
			result.append("   Size: ").append(event.getSize(ptrIdx))
					.append("\n");

			ptrIdx++;
		}
		result.append("Downtime: ").append(event.getDownTime()).append("ms\n");
		result.append("Event time: ").append(event.getEventTime()).append("ms");
		result.append("  Elapsed: ");
		result.append(event.getEventTime() - event.getDownTime());
		result.append(" ms\n");
		return result.toString();
	}

	public static void logAction(MotionEvent event) {
		int action = event.getActionMasked();
		int ptrIndex = event.getActionIndex();
		int ptrId = event.getPointerId(ptrIndex);

		if (action == 5 || action == 6)
			action = action - 5;

		Log.v("Action", "Pointer index: " + ptrIndex);
		Log.v("Action", "Pointer Id: " + ptrId);
		Log.v("Action", "True action value: " + action);
	}
}