Android的：如何显示在一个web视图一个位图？ [英] Android: How to Display a Bitmap in a WebView?
问题描述
我使用的web视图用于显示地图状图像，由于内置的平移和缩放功能。不过，我需要叠加在地图图像上的一些其他信息（标志等）在某些点上，并显示了这一切。
I'm using a WebView for displaying a map-like image, due to the built-in panning and zooming functionality. However, I need to overlay some other information (markers etc) at certain points on the map image, and display all of this.
所以，我把我的基本地图图像作为一个位图，并覆盖我的其他图片上的（使用Canvas和更多的位图），给我所有的信息最后的位图。因为我需要编辑的图像在运行时，我不能使用pre-发文件。实现位图的叠加是没有问题的，问题是我不知道如何轻松地平移和缩放功能，显示生成的图像。
So I take my base map image as a Bitmap, and overlay my other images over that (using Canvas and more Bitmaps), giving me a final Bitmap with all the info. Because I need to edit the image at runtime, I can't use a pre-made file. Implementing the overlaying of bitmaps is not the problem, the problem is that I don't know how to easily display the resulting image with pan and zoom capabilities.
有没有一种方法来显示使用的WebView位图？或者有什么其他的建议？
Is there a way to display a Bitmap using a WebView? Or any other suggestions?
推荐答案
使用链接从itsrajesh4uguys，我创造了这个code片断：
Using the link from itsrajesh4uguys, I've created this code snippet:
// Desired Bitmap and the html code, where you want to place it
Bitmap bitmap = YOUR_BITMAP;
String html="<html><body><img src='{IMAGE_PLACEHOLDER}' /></body></html>";
// Convert bitmap to Base64 encoded image for web
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream.toByteArray();
String imgageBase64 = Base64.encodeToString(byteArray, Base64.DEFAULT);
String image = "data:image/png;base64," + imgageBase64;
// Use image for the img src parameter in your html and load to webview
html = html.replace("{IMAGE_PLACEHOLDER}", image);
webview.loadDataWithBaseURL("file:///android_asset/", html, "text/html", "utf-8", "");
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