Android中处理Touch Icon的方案(2)

这里为了便于理解还是全部贴出了demo的源码,demo中当网页加载完成之后注入上面的js代码获取touch icon信息,然后返回给java的回调方法中。如果不清楚Java代码如何实现改进方案的,可以点击Java代码编写的Android应用如何实现安全

package com.example.obtaintouchicon;
 
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
 
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.webkit.JavascriptInterface;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
 
public class MainActivity extends Activity {
 
  protected String LOGTAG = "MainActivity";
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      WebView webView = new WebView(this);
      webView.getSettings().setJavaScriptEnabled(true);
      webView.setWebViewClient(new WebViewClient() {
          @Override
          public void onPageFinished(WebView view, String url) {
              super.onPageFinished(view, url);
              final String touchIconJsCode = getTouchIconJsCode();
              Log.i(LOGTAG , "onPageFinished url = " + url + ";touchIconJsCode=" + touchIconJsCode);
              view.loadUrl("javascript:" + touchIconJsCode);
          }
      });
      webView.addJavascriptInterface(new JsObject(), "app_native");
      webView.loadUrl("http://192.168.1.5:8000/html/touchicon.html");
  }
 
   
  private class JsObject {
       
      @JavascriptInterface
      public void onReceivedTouchIcons(String url, String json) {
          Log.i(LOGTAG, "onReceivedTouchIcons url=" + url + ";json=" + json);
      }
  }
   
  private String getTouchIconJsCode() {
      StringBuilder total = new StringBuilder();
      InputStream inputStream = null;
      BufferedReader bufferReader = null;
      try {
          inputStream = getAssets().open("touchicon.js");
          bufferReader = new BufferedReader(new InputStreamReader(inputStream));
          String line;
          while ((line = bufferReader.readLine()) != null) {
              total.append(line);
          }
      } catch (FileNotFoundException e) {
          e.printStackTrace();
      } catch (IOException e) {
          e.printStackTrace();
      } finally {
          if (null != inputStream) {
              try {
                  inputStream.close();
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
      }
      return total.toString();
  }
}

返回的JSON数据

[
  {
      "sizes":"72x72",
      "rel":"apple-touch-icon-precomposed",
      "href":"https://www.linuxidc.com/20130423143600/fix/H5-72x72.png"
  },
  {
      "sizes":"114x114",
      "rel":"apple-touch-icon-precomposed",
      "href":"https://www.linuxidc.com/20130423143600/fix/H5-114x114.png"
  },
  {
      "sizes":"57x57",
      "rel":"apple-touch-icon-precomposed",
      "href":"https://www.linuxidc.com/20130423143600/fix/H5-57x57.png"
  },
  {
      "sizes":"",
      "rel":"apple-touch-icon-precomposed",
      "href":"https://www.linuxidc.com/20130423143600/fix/H5-0x0.png"
  }
]

我们可以对得到的JSON数据按照需要处理。

Google会改进么

答案是会,而且已经改进,但Google修改的不是onReceivedTouchIconUrl这个方法,而是Google正在推行自己的一套规则。

在Chrome上,Google增加了这样一个元素,这是Google提供的为网页程序定义元数据的方法。

<span><link href="https://www.linuxidc.com/manifest.json"></span>

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