实现图片自旋转的同时自由移动~~

           本文介绍了如何使用SurfaceView然后实现图片的自旋转同时移动的问题。

           我采用的方法是一种比较笨的方法，主要是实在在网上找不到好的方法，所以如果有人有更好的方法，还望不吝赐教。

           我首先将一张图片旋转了三次，然后得到了4个原图片（当然弄个24张或许更好效果），然后再每次设定的时候就换一张图片你懂得我想。然后就移动图像，然后再不断的循环，最后就达到了我想要的基本效果。代码，有点乱是我根据网上一个SurfaceView改的也没有理就放上来了，还望各位海涵。好了，废话不多说了直接上代码：

        

public class BallSurfaceView extends SurfaceView implements
		SurfaceHolder.Callback {
	MainActivity myMainActivity;// 调用该SurfaceView的上下文引用
	private Ball ball;// 小球
	SurfaceHolder holder;
	private int count = 0;
	private float runX=100;// 球的位置
	private float runY=100;// 球的位置
	private float maxHeight=100;// 当前运动最高的高度
	private float maxWidth=100;

	/**
	 * 18. * 球的高 19.
	 */
	public static final int HEIGHT = 93;
	/**
	 * 22. * 球的宽 23.
	 */
	public static final int WIDTH = 93;
	
	private boolean upDirection = false;// if true,up direction,or is down
										// direction
	private boolean rightDirection=false;
	private static final int STEPLENGTH = 5;// 每次运动的间距
	
	public void init(Context context) {
		this.myMainActivity = (MainActivity) context;
		newBall();
		holder = this.getHolder();
		holder.addCallback(this);
	}

	public BallSurfaceView(Context context, AttributeSet attrs) {
		super(context, attrs);
		//System.out
		//		.println("BallSurfaceView(Context context, AttributeSet attrs)");
		this.myMainActivity = (MainActivity) context;
		newBall();
		holder = this.getHolder();
		holder.addCallback(this);
	}

	@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.GRAY);// 设置背景白色
		if (canvas != null) {
			canvas.drawRect(0, 0, myMainActivity.screenWidth,
					myMainActivity.screenHeight, p);
		}
		p.setColor(c);
		newBall();
		ball.onDraw(canvas);
		holder.unlockCanvasAndPost(canvas);// 释放锁
		move();
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		Canvas canvas = null;
		if (canvas == null)
			canvas = holder.lockCanvas();// 锁定画布
		Paint p = new Paint();
		int c = p.getColor();
		p.setColor(Color.GRAY);// 设置背景白色
		if (canvas != null)
			canvas.drawRect(0, 0, myMainActivity.screenWidth,
					myMainActivity.screenHeight, p);
		p.setColor(c);
		newBall();
		ball.onDraw(canvas);
		holder.unlockCanvasAndPost(canvas);// 释放锁
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {

	}

	public void newBall() {
		ball = new Ball(this, count);
		if (count != 3) {
			count++;
		} else {
			count = 0;
		}
	}
	
	
	public class Ball {


		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 Paint paint;
		Bitmap ballBitmap;// 球的图片
		MainActivity sa;

		public Ball( BallSurfaceView bsv,int count) {
			//System.out.println("count:" + count);
			ballBitmap = BitmapFactory.decodeResource(bsv.getResources(),
					MyUtils.BALLRESOURCE[count]);// 加载图片
			paint = new Paint();
			sa = bsv.myMainActivity;
		}

		public void onDraw(Canvas canvas) {
			int c = paint.getColor();// 保存颜色，之后还原为之前颜色
			boundaryTest();
			if (canvas != null)
				canvas.drawBitmap(ballBitmap, runX, runY, paint);
			paint.setColor(c);
		
		}

	

		/**
		 * 70. * 边界检测，使球不会飞出边界 71.
		 */
		private void boundaryTest() {

			if (runY > sa.screenHeight - HEIGHT) {// 向下运动到头
				upDirection = !upDirection;// 方向置反
				runY = sa.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 >= (sa.screenHeight - HEIGHT))
					return;
				runY = maxHeight;

			}
			if (runX > sa.screenWidth - WIDTH) {// 向右运动到头
			rightDirection = !rightDirection;// 方向置反
				runX = sa.screenWidth - WIDTH;
				stepReduce = (int) (maxWidth * REDUCEPERCENTAGE);
				maxWidth = maxWidth + stepReduce;// 最大高度递减

			}
			if (runX < maxWidth) {// 向右运动到头
				rightDirection = !rightDirection;// 方向置反
				if (maxWidth >= (sa.screenWidth - WIDTH))
					return;
				runX = maxWidth;
			}
		}
	}
	/**
	 * 56. * 运动 57.
	 */
	private void move() {
		if (maxHeight >= (myMainActivity.screenHeight - HEIGHT)) {
			
		}else {
		if (upDirection) {// 向上
			runY = runY + STEPLENGTH;
		} else {
			runY = runY - STEPLENGTH;
		}
		}
		if(maxWidth>=(myMainActivity.screenWidth-WIDTH)){
			
		}else{
			if(rightDirection){
				runX+=STEPLENGTH;
			}else{
				runX-=STEPLENGTH;
			}
		}
	}
}

这是最核心的一个类，其中写出了如何实现这个SurfaceView从而实现移动和旋转的。

然后是MainActivity:

public class MainActivity extends Activity {


<span style="white-space:pre">	</span>public int screenWidth;
<span style="white-space:pre">	</span>public int availableMoveHeight;
<span style="white-space:pre">	</span>private int screenHeight;
<span style="white-space:pre">	</span>BallSurfaceView bsv;
<span style="white-space:pre">	</span>private Handler mHandler = new Handler();


<span style="white-space:pre">	</span>@Override
<span style="white-space:pre">	</span>public void onCreate(Bundle savedInstanceState) {
<span style="white-space:pre">		</span>super.onCreate(savedInstanceState);
<span style="white-space:pre">		</span>setContentView(R.layout.activity_main);
<span style="white-space:pre">		</span>bsv = (BallSurfaceView) findViewById(R.id.myBall);
<span style="white-space:pre">		</span>bsv.init(MainActivity.this);
<span style="white-space:pre">		</span>// 获得屏幕尺寸
<span style="white-space:pre">		</span>DisplayMetrics dm = new DisplayMetrics();
<span style="white-space:pre">		</span>dm = this.getApplicationContext().getResources().getDisplayMetrics();
<span style="white-space:pre">		</span>System.out.println("all height:" + dm.heightPixels);
<span style="white-space:pre">		</span>screenWidth = dm.widthPixels;
<span style="white-space:pre">		</span>screenHeight = dm.heightPixels;
<span style="white-space:pre">		</span>Runnable r = new Runnable() {
<span style="white-space:pre">			</span>@Override
<span style="white-space:pre">			</span>public void run() {
<span style="white-space:pre">				</span>availableMoveHeight = getHeightExceptTitleStatusBar(screenHeight);
<span style="white-space:pre">			</span>}
<span style="white-space:pre">		</span>};
<span style="white-space:pre">		</span>mHandler.postDelayed(r, 200);
<span style="white-space:pre">		</span>System.out.println("screenHeight:" + availableMoveHeight);
<span style="white-space:pre">		</span>// 下两句为设置全屏


<span style="white-space:pre">		</span>/*
<span style="white-space:pre">		</span> * requestWindowFeature(Window.FEATURE_NO_TITLE);
<span style="white-space:pre">		</span> * getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
<span style="white-space:pre">		</span> * WindowManager.LayoutParams.FLAG_FULLSCREEN);
<span style="white-space:pre">		</span> */
<span style="white-space:pre">		</span>new RefreshThread().start();
<span style="white-space:pre">	</span>}


<span style="white-space:pre">	</span>@Override
<span style="white-space:pre">	</span>protected void onPause() {
<span style="white-space:pre">		</span>// TODO Auto-generated method stub
<span style="white-space:pre">		</span>super.onPause();
<span style="white-space:pre">	</span>}


<span style="white-space:pre">	</span>public int getHeightExceptTitleStatusBar(int height) {
<span style="white-space:pre">		</span>Class<?> c = null;
<span style="white-space:pre">		</span>Object obj = null;
<span style="white-space:pre">		</span>Field field = null;
<span style="white-space:pre">		</span>int x = 0, statusBarHeight = 0;
<span style="white-space:pre">		</span>try {
<span style="white-space:pre">			</span>c = Class.forName("com.android.internal.R$dimen");
<span style="white-space:pre">			</span>obj = c.newInstance();
<span style="white-space:pre">			</span>field = c.getField("status_bar_height");
<span style="white-space:pre">			</span>x = Integer.parseInt(field.get(obj).toString());
<span style="white-space:pre">			</span>statusBarHeight = getResources().getDimensionPixelSize(x);
<span style="white-space:pre">		</span>} catch (Exception e1) {
<span style="white-space:pre">			</span>e1.printStackTrace();
<span style="white-space:pre">		</span>}
<span style="white-space:pre">		</span>int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT)
<span style="white-space:pre">				</span>.getTop();
<span style="white-space:pre">		</span>// statusBarHeight是上面所求的状态栏的高度
<span style="white-space:pre">		</span>int titleBarHeight = contentTop - statusBarHeight;
<span style="white-space:pre">		</span>System.out.println("title:" + titleBarHeight + "contentTop:"
<span style="white-space:pre">				</span>+ contentTop + "stat:" + statusBarHeight);
<span style="white-space:pre">		</span>return height - statusBarHeight - titleBarHeight;
<span style="white-space:pre">	</span>}


<span style="white-space:pre">	</span>private class RefreshThread extends Thread {


<span style="white-space:pre">		</span>@Override
<span style="white-space:pre">		</span>public void run() {


<span style="white-space:pre">			</span>while (true) {
<span style="white-space:pre">				</span>Canvas canvas = null;
<span style="white-space:pre">				</span>try {
<span style="white-space:pre">					</span>bsv.onDraw(canvas);
<span style="white-space:pre">				</span>} catch (Exception e) {
<span style="white-space:pre">					</span>e.printStackTrace();
<span style="white-space:pre">				</span>}
<span style="white-space:pre">				</span>try {
<span style="white-space:pre">					</span>Thread.sleep(20);
<span style="white-space:pre">				</span>} catch (InterruptedException e) {
<span style="white-space:pre">					</span>e.printStackTrace();
<span style="white-space:pre">				</span>}
<span style="white-space:pre">			</span>}
<span style="white-space:pre">		</span>}


<span style="white-space:pre">	</span>}
}

然后是我的Utils:

public class MyUtils {

	public static final int[] BALLRESOURCE = { R.drawable.ic_launcher,
			R.drawable.ic_launcher90, R.drawable.ic_launcher180,
			R.drawable.ic_launcher270 };

}

最后是我的activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <com.example.ball.BallSurfaceView
        android:id="@+id/myBall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

最后，这个代码有很多问题，不过就功能来说是实现了。各位看着改吧，最好自己重写吧，会好一点···