android WebView java与js相互调用

android webView js 使用
1、js调用java
   1、1 js代码


   1.2、java代码
   package com.example.webview;
   import android.annotation.SuppressLint;
   import android.content.Intent;
   import android.net.Uri;
   import android.os.Bundle;
   import android.support.v7.app.ActionBarActivity;
   import android.view.KeyEvent;
   import android.view.Menu;
   import android.view.MenuItem;
   import android.view.Window;
   import android.webkit.JavascriptInterface;
   import android.webkit.WebSettings;
   import android.webkit.WebView;
   import android.webkit.WebViewClient;

   @SuppressLint("JavascriptInterface")
   public class MainActivity extends ActionBarActivity {

       private WebView webView;
       private int screenHeight;
       private int screenWidth;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);

           requestWindowFeature(Window.FEATURE_NO_TITLE); //设置无标题
           setContentView(R.layout.activity_main);

           webView = (WebView) findViewById(R.id.web_view);
           WebSettings webSettings = webView.getSettings();
           webSettings.setBuiltInZoomControls(true);
           webSettings.setLoadWithOverviewMode(true);
           webSettings.setJavaScriptEnabled(true);

           webView.setWebViewClient(new MyWebViewClient());
           webView.addJavascriptInterface(new MyAndroidInterface(), "androidInterface");

           String url ="file:///android_asset/tangbangjidian/fuwu.html";
           //String url ="file:///android_asset/baitian/index.html";
           webView.loadUrl(url);
       }

       class MyAndroidInterface{

           public MyAndroidInterface(){};

           @JavascriptInterface //注意：加上这行注解
           public void call(String number){
               //用intent启动拨打电话
                Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+number));
                startActivity(intent);
           }
       }

       @Override
       public boolean onKeyDown(int keyCode, KeyEvent event) {
           if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
               webView.goBack(); //goBack()表示返回WebView的上一页面
                return false;
            }
           return true;
       }

       private class MyWebViewClient extends WebViewClient{
           @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);// 当打开新链接时，使用当前的 WebView，不会使用系统其他浏览器
                return true;
            }
       }

       @Override
       public boolean onCreateOptionsMenu(Menu menu) {
           getMenuInflater().inflate(R.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);
       }
   }

2、java 调用js
   2.1、java代码，webView为WebView对象
       // 无参数调用
       webView.loadUrl("javascript:javacalljs()");
       // 传递参数调用
       webView.loadUrl("javascript:javacalljswithargs(" + "'hello world'" + ")");
   2.2、js代码
   function javacalljs(){
     document.getElementById("content").innerHTML +=
         "   }

   function javacalljswithargs(arg){
         document.getElementById("content").innerHTML +=
             ("   }

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