[Android实例] android多点触摸demo
MultiTouchActivitypackage com.zhaokai.multitouch;import android.app.Activity;import android.os.Bundle;import android.view.Window;import android.view.WindowManager;public class MultiTouchActivity extends Activity { /** Called when the activity is first created. */ /** 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 MySurfaceView(this)); }}SurfaceView类：
package com.zhaokai.multitouch;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MySurfaceView extends SurfaceView implements Callback{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; private int colors[] = new int; private int width, height; private float scale = 1.0f;public MySurfaceView(Context context) {super(context);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();}public void init(){// 初始化10个不同颜色的画笔 textPaint.setColor(Color.WHITE); colors = Color.BLUE; colors = Color.RED;colors = Color.GREEN;colors = Color.YELLOW;colors = Color.CYAN;colors = Color.MAGENTA;colors = Color.DKGRAY;colors = Color.WHITE;colors = Color.LTGRAY;colors = Color.GRAY;for(int i=0;i<MAX_TOUCHPOINTS;i++){ touchPaints=new Paint(); touchPaints.setColor(colors);}}@Overridepublic boolean onTouchEvent(MotionEvent event) {int pointerCount=event.getPointerCount();if(pointerCount>MAX_TOUCHPOINTS){ pointerCount=MAX_TOUCHPOINTS;}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 c.drawColor(Color.BLACK); }else{ // 先在屏幕上画一个十字，然后画一个圆 for(int i=0;i<pointerCount;i++){ //获取一个触点的坐标，然后开始绘制 int id=event.getPointerId(i); int x=(int)event.getX(i); int y=(int)event.getY(i); drawCrosshairsAndText(x, y, touchPaints, i, id, c); } for(int i=0;i<pointerCount;i++){ int id=event.getPointerId(i); int x=(int)event.getX(i); int y=(int)event.getY(i); drawCircle(x, y, touchPaints,c); } } getHolder().unlockCanvasAndPost(c);}return true;}private void drawCrosshairsAndText(int x, int y, Paint paint, int ptr,int id, Canvas c) {c.drawLine(0, y, width, y, paint); c.drawLine(x, 0, x, height, paint); int textY = (int) ((15 + 20 * ptr) * scale); c.drawText("x" + ptr + "=" + x, 10 * scale, textY, textPaint); c.drawText("y" + ptr + "=" + y, 70 * scale, textY, textPaint); c.drawText("id" + ptr + "=" + id, width - 55 * scale, textY, textPaint); }private void drawCircle(int x, int y, Paint paint, Canvas c) {c.drawCircle(x, y, 40 * scale, paint); }@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { this.width = width; this.height = height; if (width > height){ this.scale = width / 480f; } else { this.scale = height / 480f; } textPaint.setTextSize(14 * scale); Canvas c = getHolder().lockCanvas(); if (c != null) { // 背景黑色 c.drawColor(Color.BLACK); float tWidth = textPaint.measureText(START_TEXT); c.drawText(START_TEXT, width / 2 - tWidth / 2, height / 2,textPaint); getHolder().unlockCanvasAndPost(c); }}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stub}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub} }
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