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：
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 stubwhile(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();}}}@overridepublic void surfacechanged(surfaceholder holder, int format, int width,int height) {// todo auto-generated method stub}@overridepublic void surfacecreated(surfaceholder holder) {mrunning = true;new thread(this).start();}@overridepublic void surfacedestroyed(surfaceholder holder) {// todo auto-generated method stubmrunning = 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。
