final int width = metrics.widthPixels;
final int height = metrics.heightPixels;
final Bitmap lBmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
final Canvas lCanvas = new Canvas(lBmp);
final ImageView lImgView = new ImageView(this);
lImgView.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
lImgView.setImageBitmap(lBmp);
lImgView.setScaleType(ImageView.ScaleType.CENTER);
lImgView.setPadding(0, 0, 0, 0);
final Paint bck = new Paint();
bck.setARGB(0xff, 0x80, 0x80, 0x80);
lCanvas.drawRect(0, 0, width, height, bck);
final Paint p = new Paint();
p.setARGB(0xff, 0xff, 0x00, 0xff);
mLinearLayout.addView(lImgView);
setContentView(mLinearLayout);
lImgView.setOnTouchListener(new OnTouchListener() {
// start and end coordinates for a single line
float sx, sy, ex, ey;
public boolean onTouch(View aView, MotionEvent aME) {
Rect lRect = new Rect();
Window lWindow = getWindow();
lWindow.getDecorView().getWindowVisibleDisplayFrame(lRect);
int lStatusBarHeight = lRect.top;
int lContentViewTop =
lWindow.findViewById(Window.ID_ANDROID_CONTENT).getTop();
final int lTitleBarHeight = lContentViewTop - lStatusBarHeight;
int lAction = aME.getAction();
float lX = aME.getX();
float lY = aME.getY();
switch (lAction) {
case MotionEvent.ACTION_DOWN:
ex = lX;
ey = lY + lTitleBarHeight;
break;
case MotionEvent.ACTION_MOVE:
sx = ex;
sy = ey;
ex = lX;
ey = lY + lTitleBarHeight;
lCanvas.drawLine(sx, sy, ex, ey, p);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
break;
}
lImgView.invalidate();
return true;
}
});
}