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Android java 与 javascript互访(相互调用)的方法例子

2014-04-25 23:15 2451 查看

转载请注明原贴地址:http://blog.csdn.net/feifei454498130/archive/2011/06/03/6524183.aspx

有时用java去控制javascript，可以控制整个WebView,或者是flash播放器。而用javascript访问java则可以起一个回调的作用或者其它。

以下是一个简单的例子，大家看一下就明白了。

新建一个index.html文件保存到assets/sample文件夹下

<html> <head> <meta http-equiv="content-type" content="text/html;charset=UTF-8"> <title> this is a test...</title> </head> <body> <script type="text/javascript"> function javaWork(str) { document.getElementById("output").innerHTML = str; } </script> <a href="javascript:myfunction.show('这是来自javascript的参数')">Click here~</a><br> <a href="javascript:myfunction.DumpActivity('com.android.settings', 'com.android.settings.Settings')">跳到setting的Activity~</a><br> <div id="output"></div> </body>

res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<WebView
android:id="@+id/web_01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>

以下是java代码

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebSettings.PluginState;
import android.widget.Toast;
public class FlashActivity extends Activity {
private WebView mWebView;
private String url = "";

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.main);
initWebView ();
}

private void initWebView () {
url = "file:///android_asset/sample/index.html";
mWebView = (WebView)findViewById(R.id.web_01);
mWebView.clearCache(true);
mWebView.setOnKeyListener(new keyListener());
WebSettings wSetting = mWebView.getSettings();
// support for javascript
wSetting.setJavaScriptEnabled(true);
wSetting.setPluginState(PluginState.ON);

// these will access by javascript
mWebView.addJavascriptInterface(new Object() {
public void show(String str) {
showToast(str);

}
public void DumpActivity(String packet, String activityName) {
Intent intent = new Intent(Intent.ACTION_MAIN,null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ComponentName cn = new ComponentName(packet, activityName);
intent.setComponent(cn);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
startActivity(intent);
}
}, "myfunction");
mWebView.loadUrl(url);
}

/** show toast, just for test**/
private void showToast(String str){
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
class keyListener implements OnKeyListener {
public boolean onKey(View v, int keyCode, KeyEvent event) {
return onKeyDown(keyCode, event);
}

}
// key listener
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch(keyCode){
case KeyEvent.KEYCODE_MENU:
mWebView.loadUrl("javascript:javaWork('参数是来自java的~')");
break;
case KeyEvent.KEYCODE_BACK:
onDestroy();
break;
}
return super.onKeyDown(keyCode, event);
}
protected void onResume() {
super.onResume();
}
protected void onPause() {
super.onPause();
}
protected void onDestroy() {
super.onDestroy();
// kill the process
android.os.Process.killProcess(android.os.Process.myPid());
}
}

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标签： javascript android java string layout output

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