先看效果

android 集成facebook Android 集成html_html

先看布局文件：很简单，就两个button和一个webview

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.sjq.myhtmladdjs.MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="调用JS函数不带返回值" />

    <Button
        android:id="@+id/button2"
        android:layout_alignParentRight="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="代用JS带返回值" />
    <WebView
        android:id="@+id/webview"
        android:layout_below="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </WebView>
</RelativeLayout>

Android 要调用HTML肯定要先要写好HTML文件，然后把HTML文件拷贝到assets文件夹下面，结构如下图

android 集成facebook Android 集成html_html_02

看下HTML文件的具体代码：

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
    <script>
            //Android调用JS，不带返回值
            function androidcallJs(arg){
                document.getElementById("content").innerHTML = arg;
                alert(arg);
            }
            //Android调用JS，带返回值
            function getSummation(num1,num2){

                window.android.onSumResult(num1+num2);

            }

            function getSum2(num1,num2){
                    return num1+num2;
            }

    </script>

    <style>
        .input{background: coral;border: chartreuse;position: relative;top: 100px;width: 50%;
        height: 100px;margin:0 auto;border: aqua;border-style: solid;border-width: 1px;

        border-radius: calc(10px);


        }
        .mydiv{background: cornflowerblue;width: 100% auto; height: 200px;text-align: center;line-height: 200px;margin: 0 auto;}
        .mybody{background: chartreuse;}
    </style>

</head>
<body class="mybody">
<div class="mydiv" id="content">WebView内容显示</div>

<input class="input" value="创建dialog" type="button"
       onclick="window.android.startFunction('i am come from JS')" />

</body>
</html>

然后看下MainActivity.java的代码：

package com.sjq.myhtmladdjs;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.AlertDialog;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button call_js_btn;
    private Button call_android_btn;
    private WebView mwebView;

    @SuppressLint("JavascriptInterface")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        call_js_btn = (Button) findViewById(R.id.button);
        call_android_btn = (Button) findViewById(R.id.button2);


        mwebView = (WebView) findViewById(R.id.webview);
        call_js_btn.setOnClickListener(listener);
        call_android_btn.setOnClickListener(listener);

        mwebView.getSettings().setJavaScriptEnabled(true);      //设置可以加载javascript
        mwebView.loadUrl("file:///android_asset/sjq.html");     // 从assets目录下面的加载html
        mwebView.setWebChromeClient(new WebChromeClient() {
        });  //不设置alert无法弹出
        mwebView.addJavascriptInterface(MainActivity.this, "android");

    }


    View.OnClickListener listener = new View.OnClickListener() {
        @TargetApi(Build.VERSION_CODES.KITKAT)
        @Override
        public void onClick(View view) {
            switch (view.getId()) {
                //Android调用JS方法，传参，不带返回值
                case R.id.button:
                    mwebView.loadUrl("javascript:androidcallJs('我来自Android')");
                    break;
                case R.id.button2:
                    //Android  调用JS  有返回值 4.4以前  Android调JS，JS完成计算，再次调用Android将计算结果返回
                    mwebView.loadUrl("javascript:getSummation(1,2)");

                    mwebView.evaluateJavascript("getSum2(424121,2)", new ValueCallback<String>() {
                        @Override
                        public void onReceiveValue(String s) {
                            Log.i("sum", "onReceiveValue:---------> " + s);
                            Toast.makeText(MainActivity.this, s, Toast.LENGTH_SHORT).show();
                        }
                    });
                    break;
            }
        }
    };

    @JavascriptInterface
    public void startFunction(final String text) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                new AlertDialog.Builder(MainActivity.this).
                        setMessage(text).show();
            }
        });
    }


    @JavascriptInterface
    public void onSumResult(int sum) {
        Log.i("sum", "onSumResult: ------>" + sum);
        Toast.makeText(MainActivity.this, sum + "",
                Toast.LENGTH_SHORT).show();
    }




}

一些说明代码里面写的也比较详细了，需要的童鞋可以看看！对HTML不太了解的同学，可以花点时间看看，不是太难