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：
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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