Android 显示 WebView ，加载URL 时，向webview的 header 里面传递参数

<?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" android:fitsSystemWindows="true" tools:context=".MainActivity"> <WebView android:id="@+id/webview" android:layout_width="match_parent" android:layout_height="match_parent"> </WebView> </RelativeLayout>

 1 package com.webview.demo;  2  3 import android.os.Bundle;  4 import android.support.v7.app.AppCompatActivity;  5 import android.webkit.WebView;  6  7 import java.util.HashMap;  8 import java.util.Map;  9 10 public class MainActivity extends AppCompatActivity { 11 12 private WebView webView ; 13 14 private String webViewHeaderKey = "tokenId" ; 15 private String webViewHeaderValue = "562142" ; 16 17 private String url = "" ; 18 19  @Override 20 protected void onCreate(Bundle savedInstanceState) { 21 super.onCreate(savedInstanceState); 22  setContentView(R.layout.activity_main); 23 24 webView = (WebView) findViewById( R.id.webview ); 25 26 27 if ( webViewHeaderValue != "" ){ 28 Map<String, String > map = new HashMap<String, String>() ; 29  map.put( webViewHeaderKey , webViewHeaderValue ) ; 30 31  webView.loadUrl( url , map ) ; 32 }else { 33  webView.loadUrl( url ) ; 34  } 35 36  } 37 }