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Android轻松画出触摸轨迹

转载 作者:qq735679552 更新时间:2022-09-28 22:32:09 25 4
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本文实例介绍了android如何画出触摸轨迹的方法,分享给大家供大家参考,具体内容如下 。

效果图:

Android轻松画出触摸轨迹

实现代码:

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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);
   //全屏显示
   requestwindowfeature(window.feature_no_title);
   getwindow().setflags(windowmanager.layoutparams.flag_fullscreen,
   windowmanager.layoutparams.flag_fullscreen);
   setcontentview( new myview( this ));
   }
   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(context context){
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 ;
   }
   //记录当前触摸点得当前得坐标
   mposx = x;
   mposy = y;
return true ;
}
private void ondraw(){
mcanvas.drawcolor(color.white);
//绘制曲线
mcanvas.drawpath(mpath, mpaint);
mcanvas.drawtext( "当前触笔x:" +mposx, 0 , 20 ,mtextpaint);
mcanvas.drawtext( "当前触笔y:" +mposy, 0 , 40 ,mtextpaint);
}
public void run() {
// todo auto-generated method stub
while (mrunning){
long starttime = system.currenttimemillis();
synchronized (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-generated 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 ;
}
  
   }
}

以上就是android轻松画出触摸轨迹的具体方法,希望对大家的学习有所帮助.

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