在这个例程当中，主要讲了将一个图片压缩成字节流，然后转化成数组 在变成图片的故事。
首先 图片压缩成流 在转变成图片的方法还是值得学习的：

private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format, 

 int quality) { 

 ByteArrayOutputStream os = new ByteArrayOutputStream(); 

 src.compress(format, quality, os); 


 byte[] array = os.toByteArray(); 

 return BitmapFactory.decodeByteArray(array, 0, array.length); 

 }

初始化 图片：

mBitmaps = new Bitmap[6]; 

 // these three are initialized with colors[] 

 mBitmaps[0] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, 

 Bitmap.Config.ARGB_8888); 

 [color=red] mBitmaps[1] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT,[/color] Bitmap.Config.RGB_565); 

 mBitmaps[2] = Bitmap.createBitmap(colors, 0, STRIDE, WIDTH, HEIGHT, 

 Bitmap.Config.ARGB_4444); 


 // these three will have their colors set later 

 mBitmaps[3] = Bitmap.createBitmap(WIDTH, HEIGHT, 

 Bitmap.Config.ARGB_8888); 

 [color=red]mBitmaps[4] = Bitmap.createBitmap(WIDTH, HEIGHT, 

 Bitmap.Config.RGB_565);[/color] mBitmaps[5] = Bitmap.createBitmap(WIDTH, HEIGHT, 

 Bitmap.Config.ARGB_4444); 

 for (int i = 3; i <= 5; i++) { 

 mBitmaps[i].setPixels(colors, 0, STRIDE, 0, 0, WIDTH, HEIGHT); 

 } 


 for (int i = 0; i < mBitmaps.length; i++) { 

 mJPEG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.JPEG, 80); 

 mPNG[i] = codec(mBitmaps[i], Bitmap.CompressFormat.PNG, 0);

最后将图片绘画在屏幕上

@Override protected void onDraw(Canvas canvas) { 

 canvas.drawColor(Color.WHITE); 


 for (int i = 0; i < mBitmaps.length; i++) { 

 canvas.drawBitmap(mBitmaps[i], 0, 0, null); 

 canvas.drawBitmap(mJPEG[i], 80, 0, null); 

 canvas.drawBitmap(mPNG[i], 160, 0, null); 

 canvas.translate(0, mBitmaps[i].getHeight()); 

 } 


 // draw the color array directly, w/o craeting a bitmap object 

 canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, 

 true, null); 

 canvas.translate(0, HEIGHT); 

 canvas.drawBitmap(mColors, 0, STRIDE, 0, 0, WIDTH, HEIGHT, 

 false, mPaint); 

 }

上面的绘制 有三种情况 绘制jpeg 绘制png 直接绘制原数组。
mBitmaps[i].setPixels(colors, 0, STRIDE, 0, 0, WIDTH, HEIGHT);
也可以通过上面的方式来改变颜色