Android easy to draw a touch trajectory _android

The example of this article introduces how Android can draw a touch path, and share it for everyone's reference, the details are as follows

Effect Chart:

Implementation code:

Package com.android.gameview5;
Import android.app.Activity;
Import Android.content.Context;
Import Android.graphics.Canvas;
Import Android.graphics.Color;
Import Android.graphics.Paint;
Import Android.graphics.Path;
Import Android.os.Bundle;
Import android.view.MotionEvent;
Import Android.view.SurfaceHolder;
Import Android.view.SurfaceHolder.Callback;
Import Android.view.SurfaceView;
Import Android.view.Window;

Import Android.view.WindowManager;
  public class SurfaceViewActivity3 extends activity {public void onCreate (Bundle s) {super.oncreate (s);
  Full Screen display requestwindowfeature (window.feature_no_title);
  GetWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
  Setcontentview (This) (new MyView); 
  
  The public class MyView extends Surfaceview implements callback,runnable{public static final int time_in_frame = 50;
  Paint mpaint = null;
  Paint mtextpaint = null;
  
  
  Surfaceholder msurfaceholder = null; Boolean mrunning = false;
  
  
  Canvas Mcanvas = null;
  
  Private Path MPath;
  
private float Mposx,mposy;
  Public MyView {Super (context); this.setfocusable (true); This.setfocusableintouchmode (true);
  Msurfaceholder = This.getholder ();
  Msurfaceholder.addcallback (this);
      
  Mcanvas = new Canvas ();
  Mpaint = new Paint ();
  
  
  Mpaint.setcolor (Color.Black);
  
  Mpaint.setantialias (TRUE);
  
  
  Mpaint.setstyle (Paint.Style.STROKE);
  
  
  Mpaint.setstrokecap (Paint.Cap.ROUND);
  
  Mpaint.setstrokewidth (6);
  
  
  MPath = new Path ();
  
  Mtextpaint = new Paint ();
  
  Mtextpaint.setcolor (Color.Black);
  
Mtextpaint.settextsize (15);
  public boolean ontouchevent (Motionevent event) {int action = event.getaction ();
  float x = Event.getx ();
  Float y = event.gety ();
  Switch (action) {case MotionEvent.ACTION_DOWN:mPath.moveTo (x, y);
  Break
  Case MotionEvent.ACTION_MOVE:mPath.quadTo (MPOSX, Mposy, x, y);
  Break
Case MOTIONEVENT.ACTION_UP:  Mpath.reset ();
  Break
  //record current touch point coordinates mposx = x;
Mposy = y;
return true; private void OnDraw () {mcanvas.drawcolor (color.white);//Draw Curve Mcanvas.drawpath (MPath, Mpaint); Mcanvas.drawtext ("
Current stylus x: "+mposx,0,20,mtextpaint";
Mcanvas.drawtext ("Current Stylus y:" +mposy,0,40,mtextpaint);} public void Run () {//TODO auto-generated method stub while (mrunning) {Long starttime = System.currenttimemillis (); synch Ronized (msurfaceholder) {Mcanvas = Msurfaceholder.lockcanvas (); OnDraw (); Msurfaceholder.unlockcanvasandpost (
Mcanvas);
Long endtime = System.currenttimemillis ();
int difftime = (int) (endtime-starttime);
while (difftime<=time_in_frame) {difftime = (int) (System.currenttimemillis ()-starttime);
Thread.yield (); @Override public void surfacechanged (surfaceholder holder, int format, int width, int height) {//TODO Auto-genera 
Ted Method stub} @Override public void surfacecreated (Surfaceholder holder) {mrunning = true; new Thread (This). Start (); } @Override public void SURFACEdestroyed (Surfaceholder holder) {//TODO auto-generated method Stub mrunning = false;}
 }
}

The above is Android easy to draw a touch track of the specific method, I hope to help you learn.