如何使用以下html为我的Android应用程序动态创建wordcloud?

时间:2015-10-04 01:32:18

标签: javascript android html d3.js webview

过去几天我尝试和尝试这些但是我无法让我的wodcloud以我想要的方式打印,这是因为我对javascript的知识很少,而且我对如何能够知之甚少将javascriptInterface合并到webview中。

我正在使用3个文件 - d3.html,d3.layout.cloud.js,d3.js.我主要编辑d3.html,因为它是通过loadUrl方法加载到我的webview中的。另外两个.js文件来自Json Davies D3 Word Cloud生成器。这是我的d3.html

的内容
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN"
    "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">

<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no">
</head>
<h1></h1>
<script src="d3.js"></script>
<script src="d3.layout.cloud.js"></script>
<script type="text/javascript">
function getWebViewSize(){
    return Android.getWebViewSize();
}
</script>
<script>(function() {
var fill = d3.scale.category20();
var layout = d3.layout.cloud()
    .size([getWebViewSize()[0], getWebViewSize()[1]])
    .words([
      "Donut", "Eclair", "Froyo", "Gingerbread", "Honeycomb", "Ice Cream Sandwich", "Jelly Bean",
      "KitKat", "Lollipop", "Marshmallow"].map(function(d) {
      return {text: d, size: 10 + Math.random() * 40};
    }))
    .padding(5)
    .rotate(0)
    .font("Impact")
    .fontSize(function(d) { return d.size; })
    .on("end", draw);
layout.start();
function draw(words) {
  d3.select("body").append("svg")
      .attr("width", layout.size()[0])
      .attr("height", layout.size()[1])
    .append("g")
      .attr("transform", "translate(" + layout.size()[0] / 2 + "," + layout.size()[1] / 2 + ")")
    .selectAll("text")
      .data(words)
    .enter().append("text")
      .style("font-size", function(d) { return d.size + "px"; })
      .style("font-family", "Impact")
      .style("fill", function(d, i) { return fill(i); })
      .attr("text-anchor", "middle")
      .attr("transform", function(d) {
        return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
      })
      .text(function(d) { return d.text; });
}
})();</script>
<body/>

我面临的问题:

  1. 我无法在javascript界面​​中获得webview的宽度和高度。 .size(方法只接受我认为整数,我无法得到我正在加载它的webview的大小。我尝试使用metrics并从document获取,我不知道它是如何工作的,但它不起作用。

  2. 我无法更改单词的颜色,每当我编辑任何样式时,它都不会加载到webview中。我也不能在单词上添加阴影。

  3. 正如您所看到的那些单词仍然是静态的,我怎样才能获得此function然后在将其加载到webview之前动态更改单词和大小?

  4. 编辑:

    我尝试了这个以获得宽度和高度,但我得到以下日志,并对第一个感到紧张

    10-04 10:14:56.234 4550-4550/[package] I/Choreographer: Skipped 35 frames!  The application may be doing too much work on its main thread.
    10-04 10:15:11.935 30842-30842/[package] I/chromium: [INFO:CONSOLE(20)] 
    "Uncaught TypeError: Cannot read property '0' of undefined", source: file:///android_asset/wordcloud_html/d3.html (20)
    10-04 10:15:14.478 30842-30842/[package] W/art: Attempt to remove local handle scope entry from IRT, ignoring
    10-04 10:15:14.478 30842-30842/[package] W/art: Attempt to remove local handle scope entry from IRT, ignoring
    10-04 10:15:14.524 30842-30842/[package] W/cr.BindingManager: Cannot call determinedVisibility() - never saw a connection for the pid: 30842
    10-04 10:15:14.537 30842-30842/[package] I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@2d741dbf time:1235333
    10-04 10:15:14.842 30842-30842/[package] I/chromium: [INFO:CONSOLE(20)] "Uncaught TypeError: Cannot read property '0' of undefined", source: file:///android_asset/wordcloud_html/d3.html (20)
    

    这是我的JavascriptInterface

    public class JavaScriptInterface {
        Context mContext;
    
        /** Instantiate the interface and set the context */
        JavaScriptInterface(Context c) {
            mContext = c;
        }
    
        @JavascriptInterface
        public int[] getWebViewSize()
        {
            int[] size = new int[2];
            size[0] = webview.getWidth();
            size[1] = webview.getHeight();
            return size;
        }
    }
    

    以下是加载webview的代码

            webView = view.getWebView();
            WebSettings ws = webView.getSettings();
            ws.setJavaScriptEnabled(true);
    
            JSInterface = new JavaScriptInterface(context);
            webView.setWebViewClient(new InternalWebViewClient());
                    webView.setBackgroundColor(fragment.getResources().getColor(R.color.analysis_complete_bg));
            webView.loadUrl("file:///android_asset/wordcloud_html/d3.html");
            webView.addJavascriptInterface(JSInterface, "Android");
    

1 个答案:

答案 0 :(得分:1)

对于你的第一个问题,我相信你只能返回原语(没有arrarys)。此外,变量webview如何创建/可访问?也许您可以尝试将界面用作简单的传递。对于你的第三个问题,来自哪里的话?这是回到你的Android Java吗?再次,您可以将其作为通过线连接。

public class JavaScriptInterface {
    Context mContext;
    int mWidth, mHeight;
    string mJSON;

    /** Instantiate the interface and set the context */
    JavaScriptInterface(Context c, int w, int h, string json) {
        mContext = c;
        mWidth = w;
        mHeight = h;
        mJSON = json;
    }

    @JavascriptInterface
    public int getWidth()
    {
        return wWidth;
    }

    @JavascriptInterface
    public int getHeight()
    {
        return mHeight;
    }

    @JavascriptInterface
    public string getWords()
    {
        return mJSON;
    }
}

并将其创建为:

new JavaScriptInterface(AppilyApplication.appContext, 
  webview.getWidth(), 
  webview.getHeight(),
  "[{\"text\":\"Hello\",\"size\":42},{\"text\":\"world\",\"size\":96}]"
);

并在JavaScript中使用它:

.size([Android.getWidth(), Android.getHeight()])
.words(JSON.parse(Android.getWords())