从HTML Android中生成位图 [英] Generate bitmap from HTML in Android

问题描述

你怎么可以生成HTML从Android中的位图？

How do can you generate a bitmap from HTML in Android?

可以在的WebView 用于这个还是有更好的方法（如可能使用的WebView 渲染引擎直）？怎么样？

Can the WebView be used for this or is there a better approach (like maybe using the WebView rendering engine directly)? How?

我想实现下面的方法...

I would like to implement the following method...

public Bitmap toBitmap(Context context, String html, Rect rect);

...其中， HTML 是HTML渲染和矩形是所需的位图的框架。

...where html is the html to render and rect is the frame of the desired bitmap.

推荐答案

这是使用的WebView从HTML字符串生成位图，并且可以在一个AsyncTask的内使用的同步方法：

A synchronous method that generates a bitmap from an HTML string using a WebView, and can be used within an AsyncTask:

public Bitmap getBitmap(final WebView w, int containerWidth, int containerHeight, final String baseURL, final String content) {
    final CountDownLatch signal = new CountDownLatch(1);
    final Bitmap b = Bitmap.createBitmap(containerWidth, containerHeight, Bitmap.Config.ARGB_8888);
    final AtomicBoolean ready = new AtomicBoolean(false); 
    w.post(new Runnable() {

        @Override
        public void run() {
            w.setWebViewClient(new WebViewClient() {
                @Override
                public void onPageFinished(WebView view, String url) {
                    ready.set(true);
                }
            });
            w.setPictureListener(new PictureListener() {
                @Override
                public void onNewPicture(WebView view, Picture picture) {
                    if (ready.get()) {
                        final Canvas c = new Canvas(b);
                        view.draw(c);
                        w.setPictureListener(null);
                        signal.countDown();
                    }
                }
            });
            w.layout(0, 0, rect.width(), rect.height());
            w.loadDataWithBaseURL(baseURL, content, "text/html", "UTF-8", null);
        }});
    try {
        signal.await();
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    return b;
}

它有一定的局限性，但它是一个开始。

It has some limitations, but it's a start.

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