android一个碰撞的动态壁纸的demo

package com.emirac.bonk; import java.util.ArrayList; import java.util.List; import java.util.Random; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.os.Bundle; import android.os.Handler; import android.service.wallpaper.WallpaperService; import android.view.MotionEvent; import android.view.SurfaceHolder; public class BonkWallpaper extends WallpaperService { public static final String SHARED_PREFS_NAME="bonksettings"; private static final int MIN_NBONKS = 2; private static final int MAX_AGE = 4000; // after this many we start killing them off whenever // we create a new one private static final int MAX_NBONKS = 32; private static final int MAX_NBONKS_GLASS = 8; // colors public static final int BG_COLOR = 0x000037; public static final int FG_COLOR = 0xc8c800; public static final int WAVE_COLOR = 0x7700aa; // radius limits private static final int MIN_RADIUS = 12; private static final int MAX_RADIUS = 50; private static final int MIN_RADIUS_GLASS = 20; private static final int MAX_RADIUS_GLASS = 60; // time between frames (msec) private static final int FRAME_INTERVAL = 20; // fader alpha value (0 - 255) private static final int DEFAULT_ALPHA = 70; private final Handler mHandler = new Handler(); @Override public void onCreate() { super.onCreate(); } @Override public void onDestroy() { super.onDestroy(); } @Override public Engine onCreateEngine() { return new BonkEngine(this); } class BonkEngine extends Engine implements SharedPreferences.OnSharedPreferenceChangeListener { private final List<Bonk> mBonks = new ArrayList<Bonk>(); private final Paint mPaint = new Paint(); private Canvas mCanvas = null; public Bitmap mBitmap = null; private SoundManager mSounds = null;; private boolean mVisible = true; private float mTouchDownY = 0; private float mTouchDownX = 0; private float mTouchUpX = 0; private float mTouchUpY = 0; private int mHeight = 0; private int mWidth = 0; private float mXOff = 0f; private float mYOff = 0f; private int mXOffPix = 0; private int mYOffPix = 0; private WallpaperService mContext = null;; private SharedPreferences mPrefs = null; private int mMaxRadius = MAX_RADIUS; private int mMinRadius = MIN_RADIUS; private int mMaxNumBonks = MAX_NBONKS; private int mMinNumBonks = MIN_NBONKS; private int mBgColor = BG_COLOR; private int mFgColor = FG_COLOR; private int mWaveColor = WAVE_COLOR; private boolean mUseSound = true; private boolean mTrails = false; private boolean mShowBonks = true; private int mBonkStyle = 0; private String mBgImageString = null; private Bitmap mBgBitmap = null; private boolean mUseBgImage = false; private final Runnable mDoNextFrame = new Runnable() { public void run() { doNextFrame(); } }; BonkEngine(WallpaperService ws) { // android.os.Debug.waitForDebugger(); final Paint paint = mPaint; paint.setColor(0xffffffff); paint.setAntiAlias(true); paint.setStrokeWidth(2); paint.setStrokeCap(Paint.Cap.ROUND); paint.setStyle(Paint.Style.STROKE); mContext = ws; mSounds = new SoundManager(mContext); mPrefs = BonkWallpaper.this.getSharedPreferences(SHARED_PREFS_NAME, 0); mPrefs.registerOnSharedPreferenceChangeListener(this); onSharedPreferenceChanged(mPrefs, null); } @Override public void onCreate(SurfaceHolder surfaceHolder) { super.onCreate(surfaceHolder); setTouchEventsEnabled(true); } public Bundle onCommand(String action, int x, int y, int z, Bundle extras, boolean resultRequested){ return (super.onCommand(action, x, y, z, extras, resultRequested)); } @Override public void onDestroy() { super.onDestroy(); mSounds.off(); mHandler.removeCallbacks(mDoNextFrame); } @Override public void onVisibilityChanged(boolean visible) { mVisible = visible; if (visible) { mSounds.on(); doNextFrame(); } else { mSounds.off(); mHandler.removeCallbacks(mDoNextFrame); } } @Override public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { super.onSurfaceChanged(holder, format, width, height); mWidth = width; mHeight = height; mCanvas = createCanvasBuffer(format, width, height); // make 3 bonks...so people don't freakout that "it doesn't do anything!" if(mBonks.size() == 0){ mBonks.add(generateBonk(mWidth/2, mHeight/2, mWidth/2, mHeight/2)); mBonks.add(generateBonk(mWidth/2, mHeight/2, mWidth/2, mHeight/2)); mBonks.add(generateBonk(mWidth/2, mHeight/2, mWidth/2, mHeight/2)); } loadBgBitmap(); return; } @Override public void onSurfaceCreated(SurfaceHolder holder) { super.onSurfaceCreated(holder); return; } @Override public void onSurfaceDestroyed(SurfaceHolder holder) { super.onSurfaceDestroyed(holder); mVisible = false; mHandler.removeCallbacks(mDoNextFrame); return; } @Override public void onOffsetsChanged(float xOffset, float yOffset, float xStep, float yStep, int xPixels, int yPixels) { mXOff = xOffset; mYOff = yOffset; if(mBgBitmap != null){ mXOffPix = (int) (mXOff * (mWidth - mBgBitmap.getWidth())); mYOffPix = (int) (mYOff * (mHeight - mBgBitmap.getHeight())); if(mCanvas != null){ mPaint.setAlpha(0xff); mCanvas.drawBitmap(mBgBitmap, mXOffPix, mYOffPix, mPaint); } } doNextFrame(); return; } @Override public void onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { mTouchDownX = event.getX(); mTouchDownY = event.getY(); } else if (event.getAction() == MotionEvent.ACTION_UP) { mTouchUpX = event.getX(); mTouchUpY = event.getY(); Bonk b = generateBonk(mTouchDownX, mTouchDownY, mTouchUpX, mTouchUpY); mBonks.add(b); } super.onTouchEvent(event); return; } private Bonk generateBonk(float x1, float y1, float x2, float y2){ Random rn = new Random(); int r = (int) (mMaxRadius * rn.nextDouble()); if(r <= mMinRadius){ r = mMinRadius; } int m = r / 2; int vx = (int) (x2 - x1); int vy = (int) (y2 - y1); Bonk b = new Bonk((int)x1, (int)y1, r, m); setV(b, vx, vy, rn); return(b); } private void setV(Bonk b, int vx, int vy, Random r) { int[] signs = {-1, 1}; vx /= (mWidth / 20); vy /= (mHeight / 20); if(vx == 0){ vx = signs[r.nextInt(2)]; } if((vx < 5) && (vx > -5)){ vx *= 5; } if((vy < 5) && (vy > -5)){ vy = (int) ((mHeight / 60) * r.nextDouble()); vy *= signs[r.nextInt(2)]; } b.setV(vx, vy); return; } Canvas createCanvasBuffer(int fmt, int w, int h){ mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); Canvas newCanvas = new Canvas(mBitmap); return(newCanvas); } // do one frame of the animation void doNextFrame() { final SurfaceHolder holder = getSurfaceHolder(); Canvas c = null; // check for collisions List<Bonk> collisionBonks = new ArrayList<Bonk>(); List<Bonk> bonks2 = new ArrayList<Bonk>(mBonks); for(Bonk b: mBonks){ b.collide(mWidth,