Android之javascript与java的交互

webview提供了接口让javascript访问Java应用程序，WebView.addJavascriptInterface()方法就是实现交互接口的好东西，先看效果图：

看下面例子： //main.xml

android:id=\

android:layout_width=\ android:layout_height=\ />

android:id=\

android:layout_width=\

android:layout_height=\ android:text=\ />

android:id=\

android:layout_width=\ android:layout_height=\ />

android:id=\

android:layout_width=\ android:layout_height=\ />

//WebJavaScript.java package com.hl;

import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.view.View;

import android.view.View.OnClickListener; import android.webkit.WebSettings; import android.webkit.WebView; import android.widget.Button; import android.widget.EditText; import android.widget.TextView;

public class WebJavaScript extends Activity { private EditText txt; private WebView wv; private Button btn;

private Handler h = new Handler();

@Override

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); txt = (EditText) findViewById(R.id.txt); wv = (WebView) findViewById(R.id.wv); btn = (Button) findViewById(R.id.btn);

WebSettings webSettings = wv.getSettings();

webSettings.setJavaScriptEnabled(true); webSettings.setSaveFormData(false); webSettings.setSavePassword(false); webSettings.setSupportZoom(false);

wv.addJavascriptInterface(new runJavaScript(), \ //myjs是自己定义的，供javascript访问的接口

String url = \file:///android_asset/android.html\ wv.loadUrl(url);

btn.setOnClickListener(new OnClickListener() { @Override

public void onClick(View v) {

//调用javascript的函数get4Android(str)

wv.loadUrl(\ } });

}

//The Java object that is bound runs in another thread and not in the thread that it was constructed in.文档的一句话！

final class runJavaScript{//这个Java 对象是绑定在另一个线程里的， public void runOnAndroidJavaScript(final String str){ h.post(new Runnable(){

@Override

public void run() {//这里应该特别注意的

TextView show = (TextView) findViewById(R.id.show); show.setText(\ } }); } }

}

//放在assets文件夹的html文件，android.html

看看效果图吧！

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