本篇通过一个实例来说明如何在javascript中去调用android的函数，其实方法也比较简单，只要调用addJavascriptInterface方法即可映射一个java对象到javascript对象。
Android代码
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package com.macernow.djstava;
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import android.support.v7.app.ActionBarActivity;
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import android.os.Bundle;
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import android.util.Log;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.webkit.JavascriptInterface;
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import android.webkit.WebView;
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public class MainActivity extends ActionBarActivity {
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private static final String TAG = "MainActivity";
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private WebView webView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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webView = (WebView)findViewById(R.id.webView);
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webView.getSettings().setJavaScriptEnabled(true);
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webView.addJavascriptInterface(this,"djstava");
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webView.loadUrl("http://192.168.31.109/demo.html");
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}
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@JavascriptInterface
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public void jsextent() {
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Log.e(TAG,"========== js extension success.");
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}
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@Override
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public boolean onCreateOptionsMenu(Menu menu) {
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// Inflate the menu; this adds items to the action bar if it is present.
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getMenuInflater().inflate(R.menu.menu_main, menu);
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return true;
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}
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@Override
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public boolean onOptionsItemSelected(MenuItem item) {
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// Handle action bar item clicks here. The action bar will
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// automatically handle clicks on the Home/Up button, so long
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// as you specify a parent activity in AndroidManifest.xml.
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int id = item.getItemId();
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//noinspection SimplifiableIfStatement
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if (id == R.id.action_settings) {
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return true;
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}
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return super.onOptionsItemSelected(item);
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}
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}
WebView一定要使能javascript。在Android 4.2之后，抛出给javascript的java方法必须加上@JavascriptInterface。
布局文件
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
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android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
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android:paddingRight="@dimen/activity_horizontal_margin"
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android:paddingTop="@dimen/activity_vertical_margin"
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android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
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<WebView
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android:id="@+id/webView"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent">
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</WebView>
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</RelativeLayout>
测试调用
在javascript脚本中调用java方法
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window.djstava.jsextent()
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如何让javascript调用android中的函数？
原文：http://blog.chinaunix.net/uid-12845622-id-5028566.html
