VELOCITY TRACKER EXAMPLE

VELOCITY TRACKER EXAMPLE

LAYOUT-

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    
    <TextView
        android:id="@+id/version"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/action"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

 <TextView
        android:text="pointer 0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/velocityx0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/velocityy0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 <TextView
        android:text="pointer 1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/velocityx1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/velocityy1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

JAVA-

package com.example.androidvelocitytracker;

import android.os.Build;
import android.os.Bundle;
import android.os.Build.VERSION_CODES;
import android.support.v4.view.VelocityTrackerCompat;
import android.util.SparseArray;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity {

 TextView textAvtion, textVelocityX0, textVelocityY0,
  textVelocityX1, textVelocityY1;
 TextView textVersion;
 VelocityTracker velocityTracker = null;
 
 static SparseArray<String> arrayVC = new SparseArray<String>();
    static {
        arrayVC.append(VERSION_CODES.BASE, "The original, first, version of Android.");
        arrayVC.append(VERSION_CODES.BASE_1_1, "First Android update, officially called 1.1");
        arrayVC.append(VERSION_CODES.CUPCAKE, "Android 1.5");
        arrayVC.append(VERSION_CODES.CUR_DEVELOPMENT, "Magic version number...");
        arrayVC.append(VERSION_CODES.DONUT, "Android 1.6");
        arrayVC.append(VERSION_CODES.ECLAIR, "Android 2.0");
        arrayVC.append(VERSION_CODES.ECLAIR_0_1, "Android 2.0.1");
        arrayVC.append(VERSION_CODES.ECLAIR_MR1, "Android 2.1");
        arrayVC.append(VERSION_CODES.FROYO, "Android 2.2");
        arrayVC.append(VERSION_CODES.GINGERBREAD,"Android 2.3");
        arrayVC.append(VERSION_CODES.GINGERBREAD_MR1, "Android 2.3.3");
        arrayVC.append(VERSION_CODES.HONEYCOMB, "Android 3.0");
        arrayVC.append(VERSION_CODES.HONEYCOMB_MR1, "Android 3.1");
        arrayVC.append(VERSION_CODES.HONEYCOMB_MR2, "Android 3.2");
        arrayVC.append(VERSION_CODES.ICE_CREAM_SANDWICH,"Android 4.0");
        arrayVC.append(VERSION_CODES.ICE_CREAM_SANDWICH_MR1,"Android 4.0.3");
        arrayVC.append(VERSION_CODES.JELLY_BEAN, "Android 4.1");
        arrayVC.append(VERSION_CODES.JELLY_BEAN_MR1, "Android 4.2");
        arrayVC.append(VERSION_CODES.JELLY_BEAN_MR2, "Android 4.3");
        arrayVC.append(VERSION_CODES.KITKAT, "Android 4.4");
    }

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  textAvtion = (TextView) findViewById(R.id.action);
  textVelocityX0 = (TextView) findViewById(R.id.velocityx0);
  textVelocityY0 = (TextView) findViewById(R.id.velocityy0);
  textVelocityX1 = (TextView) findViewById(R.id.velocityx1);
  textVelocityY1 = (TextView) findViewById(R.id.velocityy1);
  
  textVersion = (TextView)findViewById(R.id.version);
  int version = Build.VERSION.SDK_INT;
  String BuildVersion = arrayVC.get(version, "unknown");
  textVersion.setText(BuildVersion);
 }

 @Override
 public boolean onTouchEvent(MotionEvent event) {
  
  int action = event.getActionMasked();
  int index = event.getActionIndex();
        int pointerId = event.getPointerId(index);

  switch (action) {
  case MotionEvent.ACTION_DOWN:
   if (velocityTracker == null) {
    velocityTracker = VelocityTracker.obtain();
   } else {
    velocityTracker.clear();
   }
   velocityTracker.addMovement(event);
   
   if(pointerId == 0){
    textVelocityX0.setText("X-velocity (pixel/s): 0");
    textVelocityY0.setText("Y-velocity (pixel/s): 0");
   }else if(pointerId == 1){
    textVelocityX1.setText("X-velocity (pixel/s): 0");
    textVelocityY1.setText("Y-velocity (pixel/s): 0");
   }
   
   break;
  case MotionEvent.ACTION_MOVE:
   velocityTracker.addMovement(event);
   velocityTracker.computeCurrentVelocity(1000); 
   //1000 provides pixels per second
   
   float xVelocity = VelocityTrackerCompat.getXVelocity(
     velocityTracker, pointerId);
   
   float yVelocity = VelocityTrackerCompat.getYVelocity(
     velocityTracker, pointerId);
   
   if(pointerId == 0){
    textVelocityX0.setText("X-velocity (pixel/s): " + xVelocity);
    textVelocityY0.setText("Y-velocity (pixel/s): " + yVelocity);
   }else if(pointerId == 1){
    textVelocityX1.setText("X-velocity (pixel/s): " + xVelocity);
    textVelocityY1.setText("Y-velocity (pixel/s): " + yVelocity);
   }
   
   break;
  case MotionEvent.ACTION_UP:
  case MotionEvent.ACTION_CANCEL:
   velocityTracker.recycle();
   break;
  }

  return true;
 }

}