android View 示例

package yxqz.com; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.SurfaceHolder.Callback; /** * android surfaceview简单的图片绘制 * @author mahaile * */ public class GameSurfaceView extends SurfaceView implements Callback { boolean flag; //线程标示位 当为false时停止刷新界面 SurfaceHolder surfaceHolder; GameViewThread gameViewThread; int x,y; int direction=0; //图片运行方向 控制图片向上 或向下运动 int width,height; Bitmap bitmap_role; public GameSurfaceView(Context context) { super(context); surfaceHolder=this.getHolder(); surfaceHolder.addCallback(this); //添加回调 bitmap_role=BitmapFactory.decodeResource(getResources(), R.drawable.role); } public void onDraw(Canvas canvas){ canvas.drawColor(Color.BLACK); canvas.drawBitmap(bitmap_role, width/2-bitmap_role.getWidth()/2, y, null); } public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) { } public void surfaceCreated(SurfaceHolder surfaceHolder) { //获取屏幕的 宽高 只有在 surface创建的时候 才有效 ，才构造方法中获取 宽高是获取不到的 width=this.getWidth(); height=this.getHeight(); //初始化绘图线程 gameViewThread=new GameViewThread(); gameViewThread.flag=true; gameViewThread.start(); } public void surfaceDestroyed(SurfaceHolder surfaceHolder) { gameViewThread.flag=false; //销毁线程 } class GameViewThread extends Thread{ public boolean flag; public void run(){ while(flag){ Canvas canvas=null; try{ if(direction==0){ if(y>=height){ direction=1; } y+=1; }else{ if(y<=0){ direction=0; } y-=1; } canvas=surfaceHolder.lockCanvas(); //锁定画布 并获取canvas onDraw(canvas);//调用onDraw 渲染到屏幕 surfaceHolder.unlockCanvasAndPost(canvas); //此步不要忘记了喔 否则界面上显示不出来的 }catch(Exception e){ e.printStackTrace(); } try { Thread.sleep(10);//线程休眠时间 控制帧数 } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } //每一秒刷新一次 } } } }