自定义控件（SurfaceView与view结合）
?
自定义控件（SurfaceView与view结合）public BallSurfaceView(Context context, AttributeSet attrs) {super(context,attrs);…..?
package cn.edu.heut.zcl; import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.SurfaceHolder;import android.view.SurfaceView; public class BallSurfaceView extends SurfaceViewimplements SurfaceHolder.Callback{// SportActivity sportActivity ;//调用该SurfaceView的上下文引用 private Ball ball ;//小球 public static final int initX = 100; public static final int initY = 100; SurfaceHolder holder ; public int screenWidth ; public int screenHeight ; public BallSurfaceView(Context context, AttributeSet attrs) { super(context,attrs); ball = new Ball(initX, initY, this); holder = this.getHolder(); holder.addCallback(this); //获得屏幕尺寸 DisplayMetrics dm = new DisplayMetrics(); dm = context.getApplicationContext().getResources().getDisplayMetrics(); screenWidth = dm.widthPixels; screenHeight = dm.heightPixels; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if(canvas == null) canvas = holder.lockCanvas();//锁定画布 Paint p = new Paint(); int c = p.getColor(); p.setColor(Color.WHITE);//设置背景白色 if(canvas != null) canvas.drawRect(0, 0, screenWidth, screenHeight, p); p.setColor(c); ball.onDraw(canvas); holder.unlockCanvasAndPost(canvas);//释放锁 } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceCreated(SurfaceHolder holder) { new RefreshThread().start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { } public void setStop(){ ball.setStop(true); } public void setStart(){ ball.setStop(false); } public void setRestart(){ ball.setPosition(initX, initY); ball.setMaxHeight(initY); } private class RefreshThread extends Thread{ @Override public void run() { while(true){ Canvas canvas = null; try{ onDraw(canvas); }catch(Exception e){ e.printStackTrace(); } try { Thread.sleep(40); } catch (InterruptedException e) { e.printStackTrace(); } } } } } package cn.edu.heut.zcl; import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.DisplayMetrics; /** * 球类 * @author zcl * */public class Ball { /** * 球的高 */ public static final int HEIGHT = 93; /** * 球的宽 */ public static final int WIDTH = 93; private static final int STEPLENGTH = 10;//每次运动的间距 private static final float REDUCEPERCENTAGE = 0.35F;//递减系数 private int stepReduce ;//每次反向运动的缩短的距离 private boolean stop = false; public void setStop(boolean stop) { this.stop = stop; } private float runX ;//球的位置 private float runY ;//球的位置 private BallSurfaceView bsv ; private boolean upDirection = false;//if true,up direction,or is down direction private float maxHeight ;//当前运动最高的高度 private Paint paint ; Bitmap ballBitmap ;//球的图片 public Ball(float initX , float initY , BallSurfaceView bsv){ this.runX = initX; this.runY = initY ; maxHeight = initY; this.bsv = bsv; ballBitmap = BitmapFactory.decodeResource(bsv.getResources(), R.drawable.ball);//加载图片 paint = new Paint(); } public void onDraw(Canvas canvas) { int c = paint.getColor();//保存颜色，之后还原为之前颜色 if( !stop ) boundaryTest(); if(canvas != null) canvas.drawBitmap(ballBitmap,runX,runY,paint); paint.setColor(c); if( !stop ) move(); } /** * 运动 */ private void move() { if(maxHeight >= (bsv.screenHeight - HEIGHT)) { return; } if(upDirection){//向上 runY = runY + STEPLENGTH ; }else{ runY = runY - STEPLENGTH ; } } /** * 边界检测，使球不会飞出边界 */ private void boundaryTest(){ if(runY > bsv.screenHeight - HEIGHT){//向下运动到头 upDirection = !upDirection;//方向置反 runY = bsv.screenHeight - HEIGHT; stepReduce = (int) (maxHeight * REDUCEPERCENTAGE); maxHeight = maxHeight + stepReduce ;//最大高度递减 } if(runY < maxHeight ){//向上运动到头 upDirection = !upDirection;//方向置反 if(maxHeight >= (bsv.screenHeight - HEIGHT)) return; runY = maxHeight ; } } public void setPosition(float x,float y){ this.runX = x; this.runY = y; } public void setMaxHeight(float y){ this.maxHeight = y; }} package cn.edu.heut.zcl; import android.app.Activity;import android.content.pm.ActivityInfo;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.widget.Button; public class SportActivity extends Activity { Button butStop; Button butStart; Button butRestart; BallSurfaceView bsv ; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);// bsv = new BallSurfaceView(this); //下两句为设置全屏 requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN , WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); butStop =(Button)findViewById(R.id.butStop); butStop.setOnClickListener(new listener()); butStart =(Button)findViewById(R.id.butStart); butStart.setOnClickListener(new listener()); butRestart =(Button)findViewById(R.id.butRestart); butRestart.setOnClickListener(new listener()); bsv = (BallSurfaceView) findViewById(R.id.ballSurfaceView); } class listener implements View.OnClickListener{ @Override public void onClick(View v) { Button but = (Button)v; switch(but.getId()){ case R.id.butStop: bsv.setStop(); break; case R.id.butStart: bsv.setStart(); break; case R.id.butRestart: bsv.setRestart(); break; } } } } <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content" > <Button android:id="@+id/butStop" android:text="stop" android:layout_height="wrap_content" android:layout_width="wrap_content" > </Button> <Button android:id="@+id/butStart" android:text="Start" android:layout_height="wrap_content" android:layout_width="wrap_content" > </Button> <Button android:id="@+id/butRestart" android:text="ReStart" android:layout_height="wrap_content" android:layout_width="wrap_content" > </Button> </LinearLayout> <FrameLayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <cn.edu.heut.zcl.BallSurfaceView android:id="@+id/ballSurfaceView" android:layout_width="fill_parent" android:layout_height="fill_parent"> </cn.edu.heut.zcl.BallSurfaceView> </FrameLayout></LinearLayout>?
?
有问题的留言，篮球运动是直接修改的上一节的例子，需要代码的留下邮箱。
?
?
1 楼 sunjunliangsunjun 2011-10-17 哥们呢 麻烦 给我发一份能跑起来的代码 Thank u ! 2 楼 sunjunliangsunjun 2011-10-17 565426086@qq.com 3 楼 jing_wang_2011 2011-11-03 634069490@qq.com