使用 android 中的 webview 将 javascript 文件注入我的网站 [英] Inject javascript file to my site with webview in android

问题描述

我想将 javascript 文件注入我的网站.我的网站是服务器上的一个简单的 html 页面.我已经注入了 css 文件.(在 Manish 的帮助下)

I want to inject javascript file to my site. My site is a simple html page that is on server. I have injected css file. (with Manish's help)

所以我现在可以使用 CSS 管理我简单的 html 站点.但我也想用 javascript 来管理它.我的 jscript.js 文件位于 asset 文件夹中.我想在我的网站上完全访问 javascript.(请记住，这是我的网站).请为我写正确的代码.谢谢x.

So I can manage my simple html site with CSS now. But I want to manage it with javascript too. My jscript.js file is in asset folder. I want to have full access of javascript on my site. (Remember that, it is MY site) . please write the correct codes for me. Thankx.

这是我的 MainActivity.java 文件:

package com.example.z5070.myapplication;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Base64;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import java.io.InputStream;


public class MainActivity extends ActionBarActivity {



        WebView webView;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            webView = new WebView(this);
            setContentView(webView);


            webView.getSettings().setJavaScriptEnabled(true);


            webView.setWebViewClient(new WebViewClient() {

                @Override
                public void onPageFinished(WebView view, String url) {


                    injectCSS();
                    super.onPageFinished(view, url);
                }
            });


            webView.loadUrl("http://www.example.com/");
        }


        private void injectCSS() {
            try {
                InputStream inputStream = getAssets().open("style.css");
                byte[] buffer = new byte[inputStream.available()];
                inputStream.read(buffer);
                inputStream.close();
                String encoded = Base64.encodeToString(buffer, Base64.NO_WRAP);
                webView.loadUrl("javascript:(function() {" +
                        "var parent = document.getElementsByTagName('head').item(0);" +
                        "var style = document.createElement('style');" +
                        "style.type = 'text/css';" +
                        "style.innerHTML = window.atob('" + encoded + "');" +
                        "parent.appendChild(style)" +
                        "})()");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {

            getMenuInflater().inflate(R.menu.menu_main, menu);
            return true;
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
            if (id == R.id.action_settings) {
                return true;
            }
            return super.onOptionsItemSelected(item);
        }


        }

推荐答案

添加一个新的方法来注入 javascript 文件.

Add a new method to inject javascript file.

 private void injectJS() {
        try {
            InputStream inputStream = getAssets().open("jscript.js");
            byte[] buffer = new byte[inputStream.available()];
            inputStream.read(buffer);
            inputStream.close();
            String encoded = Base64.encodeToString(buffer, Base64.NO_WRAP);
            webView.loadUrl("javascript:(function() {" +
                    "var parent = document.getElementsByTagName('head').item(0);" +
                    "var script = document.createElement('script');" +
                    "script.type = 'text/javascript';" +
                    "script.innerHTML = window.atob('" + encoded + "');" +
                    "parent.appendChild(script)" +
                    "})()");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

页面加载完成后调用两个方法:injectCSS()和injectJS().

Call both methods: injectCSS() and injectJS() after page finishes loading.

webView.setWebViewClient(new WebViewClient() {

            @Override
            public void onPageFinished(WebView view, String url) {
                injectCSS();
                injectJS();
                super.onPageFinished(view, url);
            }
        });

我希望这能解决问题.

注意在注入 js 文件中定义的 onload 事件的行为.

Be wary of how onload events defined inside inject js file would behave.

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