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android webview js与android互动注意事项

2012-01-31 15:44 471 查看

用2.3.1开发会出

ERROR/InputDispatcher(61): channel '40723150 com.JavaScriptCom/com.JavaScriptCom.JavaScriptCom
(server)' ~ Channel is unrecoverably broken and will be disposed!

这个错误,必须用2.1的模拟器,这个估计是BUG.

附代码:

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.JavaScriptCom" android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon" android:label="@string/app_name">

<activity android:name=".JavaScriptCom" android:label="@string/app_name">

<intent-filter>

<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />

</intent-filter>

</activity>

</application>

<uses-sdk android:minSdkVersion="7" />

</manifest>

JavaScriptCom.java

package com.JavaScriptCom;

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 JavaScriptCom extends Activity {

final class runJavaScript {

public void runOnAndroidJavaScript(final String str) {

h.post(new Runnable() {

// @Override

public void run() {

TextView show = (TextView) findViewById(R.id.show);

show.setText("This is a message from javascript:" + str);

}

});

}

}

private EditText txt;

private WebView wv;

private Button btn;

private Handler h = new Handler();

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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");

String url = "file:///android_asset/android.html";

wv.loadUrl(url);

btn.setOnClickListener(new OnClickListener() {

public void onClick(View arg0) {

// TODO Auto-generated method stub

wv.loadUrl("javascript:get4Android('"

+ txt.getText().toString() + "')");

}

});

}

}

android.html

<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd
">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<script language="javascript" type="text/javascript">

function get4Android(str){

document.getElementById("show").innerHTML="This is a message from android:"+str;

}

function send2Android(){

var str = document.getElementById("mess").value;

window.myjs.runOnAndroidJavaScript(str);//调用android的函数

}

</script>

</head>

<body>

<input type="text" id="mess" />

<input type="button" value="Send To Android" onclick="send2Android()"/>

<div id="show"></div>

</body>

</html>

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical" android:layout_width="fill_parent"

android:layout_height="fill_parent">

<EditText android:id="@+id/txt" android:layout_width="fill_parent"

android:layout_height="wrap_content" />

<Button android:id="@+id/btn" android:layout_width="fill_parent"

android:layout_height="wrap_content" android:text="Send To JavaScript" />

<TextView android:id="@+id/show" android:layout_width="fill_parent"

android:layout_height="wrap_content" />

<WebView android:id="@+id/wv" android:layout_width="fill_parent"

android:layout_height="fill_parent" />

</LinearLayout>

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