@Android display /res/viewable in WebView

问题

I am throwing HTML to a webview to render. In the HTML I need to load an image that I have in /res/drawable.

I have /res/drawable/my_image.png and code such as this:

final WebView browser = (WebView) findViewById(R.id.my_webview);
String html = new MyHelper(myObject).getHtml();
browser.loadDataWithBaseURL("", html, "text/html", "UTF-8", "");

Where the String html has something like:

<html><head>
<h1>Here is the image</h1>
<img src="my_image.png" />
</head><html>

The question is, what should that image src attribute be to refer to the image in /res/drawable?

回答1:

This worked in android 2.2

<img src = "file:///android_res/drawable/q1.png" />

where q1.png is in the res/drawable-hdpi folder

回答2:

I admit I don't know much about WebViews / HTML, but it seems like you're taking the more complicated route for this. There's an easy way to load the HTML file; put it in your assets folder, and then it can be referred to as follows.

WebView webView = new WebView(this);
webView.loadUrl("file:///android_asset/index.html");
setContentView(webView);

Obviously your layout is more complex as you have more than just the WebView so you can't use setContentView() directly, but that's the basic idea. Then to reference an image in that HTML file, I used a <img> tag like so:

<img src="res/drawable/icon.png"/>

Does that work for you?

回答3:

user302750,

Your method is incorrect. res/drawable/banner300.jpg should be file:///android_res/drawable/banner300.jpg.

banner300.jpg can be in one of the following locations in your project, and android will automatically load the correct one for the device you're using.

res/drawable/banner300.jpg
res/drawable-ldpi/banner300.jpg
res/drawable-mdpi/banner300.jpg
res/drawable-hdpi/banner300.jpg
res/drawable-xhdpi/banner300.jpg

The assets folder is for generic resources that you don't need different versions of. An example might be an XSL template, or something of that nature.

MikeNereson, your response to your problem is also incorrect, drawable resources should be contained in the res directory.

Here's an example from my own project. I output html, exactly like this:

<img src="file:///android_res/drawable/stats_btn.png"/>

If using an ldpi device, I get the ldpi image, if using hdpi or mdpi, I get the appropriate one for those as well. Android resolves file:///android_res/drawable/stats_btn.png to one of the following resources that I have in my project.

./res/drawable-ldpi/stats_btn.png
./res/drawable-hdpi/stats_btn.png
./res/drawable-mdpi/stats_btn.png

回答4:

From my tests the path, "file:///android_res/drawable/q1.png" only works with 2.2+. For 2.1 that gives a file not found error. Moving the resource to assets will work but that isn't really feasible if you want to make use of the drawable features (meaning you'd need a copy of the image in each folder...).

回答5:

Answers involving file:// URLs may not work any more as of Android 4.0. See answer to this question. A way that will work is in the answer here.

回答6:

I have the exact same problem, but neither placing the image file in res/drawable (which I first had to create, I hust had drawable-hdpi, -ldpi and -mdpi already existing) or using the file:///asset/ URL worked for me.

Here is what I do:

Activity:

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mWebView = (WebView) findViewById(R.id.webview);
        mWebView.getSettings().setJavaScriptEnabled(true);
        String summary = "<html><body><div style=\"background:red; width:300px; height:50px;\"></div><img src=\"res/drawable/banner300.jpg\"/></body></html>";
        mWebView.loadData(summary, "text/html", "utf-8");

Then in res/drawable I placed the banner300.jpg - but it does not show up. Any ideas?

回答7:

You load the drawables like you would anywhere else in your code... http://developer.android.com/guide/topics/resources/drawable-resource.html

Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.myimage);

also @MikeNereson using Android, you can only directly access raw files that are located in the assets directory and SDCard.

来源：https://stackoverflow.com/questions/2630829/android-display-res-viewable-in-webview

标签

android

webview

drawable