Android realizes how to move pictures on the screen _android

The example in this article describes how Android implements moving pictures on the screen. Share to everyone for your reference. The implementation methods are as follows:

1. Speed.java Documents:

Package net.obviam.droidz.model.components;
  public class Speed {public static final int direction_right = 1;
  public static final int direction_left =-1;
  public static final int direction_up =-1;
  public static final int direction_down = 1;  Private float XV = 1;  Velocity value on the X axis private float YV = 1;
  Velocity value on the Y axis private int xdirection = Direction_right;
  private int ydirection = Direction_down;
    Public Speed () {THIS.XV = 1;
  THIS.YV = 1;
    Public Speed (float XV, float yv) {this.xv = XV;
  This.yv = YV;
  public float GETXV () {return XV;
  public void Setxv (float xv) {this.xv = XV;
  public float Getyv () {return yv;
  public void Setyv (float yv) {this.yv = YV;
  public int getxdirection () {return xdirection;
  The public void setxdirection (int xdirection) {this.xdirection = xdirection;
  public int getydirection () {return ydirection; } public void Setydirection (int ydirection) {this.ydirection = ydirection;
  }//Changes the direction on the X axis public void togglexdirection () {xdirection = xdirection *-1;
  }//Changes the direction on the Y axis public void toggleydirection () {ydirection = ydirection *-1; }
}

2. Main.java File:

public void Run () {Canvas Canvas;
  LOG.D (TAG, "Starting game loop");
    while (running) {canvas = null; Try locking the canvas for exclusive pixel editing//In the surface try {canvas = This.surfaceHolder.lo
      Ckcanvas ();
        Synchronized (Surfaceholder) {//Update game State this.gamePanel.update ();
      Render state to the "screen//Draws" canvas on the panel this.gamePanel.render (canvas); finally {//In case of ' an exception the ' surface is ' not ' in//a inconsistent state if (can
      VAS!= null) {surfaceholder.unlockcanvasandpost (canvas); }//End finally} is public void Update () {//Check collision and right wall if heading right if (droid.get Speed (). getxdirection () = = Speed.direction_right && droid.getx () + Droid.getbitmap (). GetWidth ()/2 >= ge
  Twidth ()) {droid.getspeed (). Togglexdirection (); }//Check collision with leftWall if heading left if (Droid.getspeed (). getxdirection () = = Speed.direction_left && droid.getx ()-Droid.
  Getbitmap (). GetWidth ()/2 <= 0) {droid.getspeed (). Togglexdirection ();
      }//Check collision with bottom wall if heading down if (Droid.getspeed (). getydirection () = = Speed.direction_down && droid.gety () + Droid.getbitmap (). GetHeight ()/2 >= getheight ()) {droid.getspeed (). Toggleydirection (
  ); }//Check collision with top wall if heading up if (Droid.getspeed (). getydirection () = = Speed.direction_up
  ;& droid.gety ()-Droid.getbitmap (). GetHeight ()/2 <= 0) {droid.getspeed (). Toggleydirection ();
}//Update the Lone Droid droid.update (); }

I hope this article will help you with your Android program.