public class TestView extends View implements ViewTreeObserver.OnGlobalLayoutListener{
 private Paint paint = new Paint();
 private Bitmap bitmap;
 private int[]local;
 boolean enter = false;
 int count;
 ViewTreeObserver observer;
 Canvas canvas;
 float lastX = 0;
 float lastY = 0;
 
 public TestView(Context context) {
  super(context);
 }
 
 public TestView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  observer = this.getViewTreeObserver();
  observer.addOnGlobalLayoutListener(this);
  getImageFromAssetsFile("target.png");//讀取圖片
 }
 
 public TestView(Context context, AttributeSet attrs) {
  super(context, attrs);
  observer = this.getViewTreeObserver();
  observer.addOnGlobalLayoutListener(this);
  getImageFromAssetsFile("target.png");
 }
 
 private void getImageFromAssetsFile(String fileName) {
  AssetManager am = getResources().getAssets();
  try {
   InputStream is = am.open(fileName);
   bitmap = BitmapFactory.decodeStream(is);
   is.close();
  }
  catch (IOException e) {
   e.printStackTrace();
  }
 }
 
 
 private void filterColor(){
  int w = bitmap.getWidth();
  int h = bitmap.getHeight();
  int[]pixels = new int[w*h];
  local = new int[w];//以原圖寬為單位，保存點(diǎn)在原圖Y軸上的位置
  bitmap.getPixels(pixels,0,bitmap.getWidth(),0,0,bitmap.getWidth(),bitmap.getHeight());
  for(int i = 0; i < w; i++){
   int lenght = 0;
   int total = 0;
   for(int j = 0;j0) {
      path.lineTo((getMeasuredWidth() / (float) bitmap.getWidth()) * (float) i, (((float) getMeasuredHeight()-25) / (float) bitmap.getHeight()) * (float) local[i]+7);
      lastX = (getMeasuredWidth() / (float) bitmap.getWidth()) * (float) i;
      lastY = (((float) getMeasuredHeight()-25 )/ (float) bitmap.getHeight()) * (float) local[i];
     }
    }
   }
   if(count