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    <p>There are a number of issues with your code....but this answer is probably way too late to be of any help anyways. </p> <p>Firstly, world.createBody() seems to have been deprecated. Now you have to explicitly call world.createDynamicBody() in the latest version of the Android Box2D jar that I have.</p> <p>Anyways...my version goes something like this...not perfect but at least its dynamic.</p> <pre><code>package com.box2D; import java.util.ArrayList; import org.jbox2d.collision.AABB; import org.jbox2d.collision.CircleDef; import org.jbox2d.collision.PolygonDef; import org.jbox2d.common.Vec2; import org.jbox2d.dynamics.Body; import org.jbox2d.dynamics.BodyDef; import org.jbox2d.dynamics.World; import android.graphics.Canvas; import android.graphics.Paint; import android.util.Log; public class PhysicsWorld { public float timeStep = 1; public int iterations = 1; private ArrayList&lt;Body&gt; bodies; private int count = 0; private AABB worldAABB; private World world; private BodyDef groundBodyDef; private PolygonDef boxShapeDef; //a paint private Paint paint; public void create() { //create the paint paint = new Paint(); paint.setColor(0xFFFFFF); // Step 1: Create Physics World Boundaries worldAABB = new AABB(); worldAABB.lowerBound.set(new Vec2((float) -100.0, (float) -100.0)); worldAABB.upperBound.set(new Vec2((float) 100.0, (float) 300.0)); // Step 2: Create Physics World with Gravity Vec2 gravity = new Vec2((float) 0.0, (float)10.0); boolean doSleep = true; world = new World(worldAABB, gravity, doSleep); bodies = new ArrayList&lt;Body&gt;(); // Step 3: Create Ground Box groundBodyDef = new BodyDef(); groundBodyDef.position.set(new Vec2((float) 0.0, (float) 300.0)); Body groundBody = world.createDynamicBody(groundBodyDef); boxShapeDef = new PolygonDef(); boxShapeDef.setAsBox((float) 50.0, (float) 10.0); groundBody.createShape(boxShapeDef); } public void addBall() { // Create Dynamic Body BodyDef bodyDef = new BodyDef(); bodyDef.position.set((float)16.0+(count * 10), (float)24.0); Body newBody = world.createDynamicBody(bodyDef); // Create Shape with Properties CircleDef circle = new CircleDef(); circle.radius = (float)5; circle.density = (float)1.0; // Assign shape to Body newBody.createShape(circle); newBody.setMassFromShapes(); newBody.m_userData = "Circle"; bodies.add(newBody); // Increase Counter count += 1; } public void addBox() { // Create Dynamic Body BodyDef bodyDef = new BodyDef(); bodyDef.position.set((float)36.0+(count * 10), (float)24.0); Body newBody = world.createDynamicBody(bodyDef); // Create Shape with Properties boxShapeDef = new PolygonDef(); boxShapeDef.setAsBox((float) 50.0, (float) 10.0); // Assign shape to Body newBody.createShape(boxShapeDef); newBody.setMassFromShapes(); newBody.m_userData = "Box"; bodies.add(newBody); // Increase Counter count += 1; } /* * * * Physics Update */ private Vec2 position; private float angle; public void Update(Canvas canvas) { // Update Physics World world.step(timeStep/5, 1); // Print info of latest body for (Body i : bodies) { position = i.getPosition(); angle = i.getAngle(); if(i.m_userData == "Circle") canvas.drawCircle(position.x, position.y, 5,paint ); if(i.m_userData == "Box") canvas.drawRect((float)(position.x -5), (float)(position.y - 5), (float)(position.x + 5), (float)(position.y + 5), paint ); Log.v("Physics Test", "Pos: (" + position.x + ", " + position.y + "), Angle: " + angle); } } } </code></pre>
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