Android开发实例之多点触控程序

event.getAction() //获取触控动作比如ACTION_DOWN  
event.getPointerCount(); //获取触控点的数量，比如2则可能是两个手指同时按压屏幕  
event.getPointerId(nID); //对于每个触控的点的细节，我们可以通过一个循环执行getPointerId方法获取索引  
event.getX(nID); //获取第nID个触控点的x位置  
event.getY(nID); //获取第nID个点触控的y位置  
event.getPressure(nID); //LCD可以感应出用户的手指压力，当然具体的级别由驱动和物理硬件决定的  
event.getDownTime() //按下开始时间  
event.getEventTime() // 事件结束时间  
event.getEventTime()-event.getDownTime()); //总共按下时花费时间 

public class MyView extends SurfaceView implements SurfaceHolder.Callback{  
  MultitouchVisible father;  
    
  private static final int MAX_TOUCHPOINTS = 10;   
  private static final String START_TEXT = "请随便触摸屏幕进行测试";   
  private Paint textPaint = new Paint();   
  private Paint touchPaints[] = new Paint[MAX_TOUCHPOINTS];   
  private int colors[] = new int[MAX_TOUCHPOINTS];   
  private int width, height;   
// private float scale = 1.0f;   
    
  public MyView(MultitouchVisible father) {  
    super(father);  
    // TODO Auto-generated constructor stub  
    this.father=father;  
    SurfaceHolder holder = getHolder();   
    holder.addCallback(this);   
    setFocusable(true); // 确保我们的View能获得输入焦点   
    setFocusableInTouchMode(true); // 确保能接收到触屏事件   
    init();   
  }  
   private void init() {   
     // 初始化10个不同颜色的画笔   
     textPaint.setColor(Color.WHITE);   
     colors[0] = Color.BLUE;   
     colors[1] = Color.RED;   
     colors[2] = Color.GREEN;   
     colors[3] = Color.YELLOW;   
     colors[4] = Color.CYAN;   
     colors[5] = Color.MAGENTA;   
     colors[6] = Color.DKGRAY;   
     colors[7] = Color.WHITE;   
     colors[8] = Color.LTGRAY;   
     colors[9] = Color.GRAY;   
     for (int i = 0; i  MAX_TOUCHPOINTS) {   
       pointerCount = MAX_TOUCHPOINTS;   
       }   
     // 锁定Canvas,开始进行相应的界面处理   
     Canvas c = getHolder().lockCanvas();   
    if (c != null) {   
      c.drawColor(Color.BLACK);   
      if (event.getAction() == MotionEvent.ACTION_UP) {   
         // 当手离开屏幕时，清屏   
         }  
      else {   
         // 先在屏幕上画一个十字，然后画一个圆   
         for (int i = 0; i 
public class MultitouchVisible extends Activity {  
  /** Called when the activity is first created. */ 
  @Override 
  public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    //隐藏标题栏   
    requestWindowFeature(Window.FEATURE_NO_TITLE);   
    //设置成全屏   
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,   
    WindowManager.LayoutParams.FLAG_FULLSCREEN);   
    //设置为上面的MTView   
    setContentView(new MyView(this));   
  }  
}