Android从view得到bitmap及bitmap叠加和保存

从view得到bitmap：

	private Bitmap getBitmapFromView(View view) {
		Bitmap bitmap = null;
		try {
			int width = view.getWidth();
			int height = view.getHeight();
			if(width != 0 && height != 0){
				bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
				Canvas canvas = new Canvas(bitmap);
				view.layout(0, 0, width, height);
				view.draw(canvas);
			}
		} catch (Exception e) {
			bitmap = null;
			e.getStackTrace();
		}
		return bitmap;
	}

Bitmap加水印：

	private Bitmap addWatermark(Bitmap src, Bitmap watermark) {
		if (src == null || watermark  == null) {
			Log.d(TAG, "src is null");
			return src;
		}
		
		int sWid = src.getWidth();
		int sHei = src.getHeight();
		int wWid = watermark.getWidth();
		int wHei = watermark.getHeight();
		if (sWid == 0 || sHei == 0) {
			return null;
		}
		
		if (sWid < wWid || sHei < wHei) {
			return src;
		}
		
		Bitmap bitmap = Bitmap.createBitmap(sWid, sHei, Config.ARGB_8888);
		try {
			Canvas cv = new Canvas(bitmap);
			cv.drawBitmap(src, 0, 0, null);
			cv.drawBitmap(watermark, sWid - wWid - 5, sHei - wHei - 5, null);
			cv.save(Canvas.ALL_SAVE_FLAG);
			cv.restore();
		} catch (Exception e) {
			bitmap = null;
			e.getStackTrace();
		}
		return bitmap;
	}

Bitmap保存：

	public static boolean saveBitmap(Bitmap bitmap, String fileName) {
		File file = new File(PATH);
		if (!file.exists()) {
			file.mkdir();
		}
		File imageFile = new File(file, fileName);
		try {
			imageFile.createNewFile();
			FileOutputStream fos = new FileOutputStream(imageFile);
			bitmap.compress(CompressFormat.JPEG, 50, fos);
			fos.flush();
			fos.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return true;
	}