转载自 : http://blog.csdn.net/gengqiquan/article/details/65938021
领导最近觉得携程的截屏生成长图分享效果比较好，所以我们也加了个；产品觉得分享出去的长图需要加公司品牌水印，于是我们也加了个；嗯，事件起因就是这样。
长图一般是ScrollView和ListView。
我们需要取得这两个控件的完整显示的图片。原理很简单，搞一张和控件长宽一致的画布（就是创建一个高宽相等的bitmap）。然后调用控件的draw方法把自己画到画布上去。
分别贴出两个控件的长图获取方法
/**
* 截取scrollview的屏幕
**/
public static Bitmap getScrollViewBitmap(ScrollView scrollView) {
int h = 0;
Bitmap bitmap;
for (int i = 0; i < scrollView.getChildCount(); i++) {
h += scrollView.getChildAt(i).getHeight();
}
// 创建对应大小的bitmap bitmap = Bitmap.createBitmap(ScreenUtils.getScreenWidth(scrollView.getContext()), h,
Bitmap.Config.ARGB_4444);
final Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.parseColor("#f2f7fa"));
scrollView.draw(canvas);
return bitmap;
}
/**
* 截图listview
**/
public static Bitmap getListViewBitmap(ListView listView, String picpath) {
int h = 0;
Bitmap bitmap;
// 获取listView实际高度
for (int i = 0; i < listView.getChildCount(); i++) {
h += listView.getChildAt(i).getHeight();
}
listView.getHeight());
// 创建对应大小的bitmap
bitmap = Bitmap.createBitmap(listView.getWidth(), h,
Bitmap.Config.RGB_565);
final Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.WHITE);
listView.draw(canvas);
// 测试输出
FileOutputStream out = null;
try {
out = new FileOutputStream(picpath);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
if (null != out) {
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
}
} catch (IOException e) {
}
return bitmap;
}
奉送个获取具体view的显示图的方法
/**
* 生成某个view的图片
*
* @author gengqiquan
* @date 2017/3/20 上午10:34
*/
public static Bitmap getViewDrawingCacheBitmap(View view) {
view = view.getRootView();
if (!view.isDrawingCacheEnabled()) {
view.setDrawingCacheEnabled(true);
}
view.destroyDrawingCache();
view.buildDrawingCache();
Bitmap bm = view.getDrawingCache();
view.setDrawingCacheEnabled(false);
return bm;
}
再奉送个生成某个LinearLayout图片的方法
/**
* 生成某个LinearLayout的图片
*
* @author gengqiquan
* @date 2017/3/20 上午10:34
*/
public static Bitmap getLinearLayoutBitmap(LinearLayout linearLayout) {
int h = 0;
// 获取LinearLayout实际高度
for (int i = 0; i < linearLayout.getChildCount(); i++) {
linearLayout.getChildAt(i).measure(0, 0);
h += linearLayout.getChildAt(i).getMeasuredHeight();
}
linearLayout.measure(0, 0);
// 创建对应大小的bitmap
Bitmap bitmap = Bitmap.createBitmap(linearLayout.getMeasuredWidth(), h,
Bitmap.Config.RGB_565);
final Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.WHITE);
linearLayout.draw(canvas);
return bitmap;
}
完了产品肯定会让你在下面或者上面加上公司的logo图片的，嗯。好人做到低，再送个拼接图片的方法
/**
*拼接图片
* @param first 分享的长图
* @param second 公司logo图
*@author gengqiquan
*@date 2017/3/25 下午4:56
*/
public static Bitmap add2Bitmap(Bitmap first, Bitmap second) {
float scale = ((float) first.getWidth()) / second.getWidth();
second = ImageUtil.scaleImg(second, scale);
int width = first.getWidth();
int height = first.getHeight() + second.getHeight();
Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
Canvas canvas = new Canvas(result);
canvas.drawBitmap(first, 0, 0, null);
canvas.drawBitmap(second, 0, first.getHeight(), null);
return result;
}
再来个添加全图水印的方法
/**
* @param first 原始图
* @param mark 水印图
* @author gengqiquan
* @date 2017/3/25 下午4:58
*/
public static Bitmap waterMark(Bitmap first, Bitmap mark) {
float scale = ((float) first.getWidth()) / mark.getWidth();
mark = ImageUtil.scaleImg(mark, scale);
int height = first.getHeight();
Canvas canvas = new Canvas(first);
int h = 0;
while (h < height + mark.getHeight()) {
canvas.drawBitmap(mark, 0, h, null);
h = h + mark.getHeight();
}
return first;
}
另：
http://www.cnblogs.com/meieiem/archive/2012/08/15/2639543.html android 实现图片加水印