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Android Activity 和 HTML 數據通信

日期：2017/3/1 10:50:45 编辑：Linux編程

Android activity 和 html一起開發難免有之間通訊的問題。今天簡單測試了一下：

代碼很簡單：

activity：

package com.lmn.webview.html;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Window;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebStorage;
import android.webkit.WebView;
import android.widget.Toast;
public class MainActivity extends Activity {
private WebView mWebView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setSavePassword(false);
webSettings.setSaveFormData(false);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(true);
// Horizontal水平方向，Vertical豎直方向
mWebView.setHorizontalScrollBarEnabled(false);
mWebView.setVerticalScrollBarEnabled(false);
mWebView.setWebChromeClient(new WebChromeClient() {
// 處理javascript中的alert
public boolean onJsAlert(WebView view, String url, String message,
final JsResult result) {
// 構建一個Builder來顯示網頁中的對話框
Builder builder = new Builder(MainActivity.this);
builder.setTitle("Alert");
builder.setMessage(message);
builder.setPositiveButton(android.R.string.ok,
new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// 點擊確定按鈕之後,繼續執行網頁中的操作
result.confirm();
}
});
builder.setCancelable(false);
builder.create();
builder.show();
return true;
};
// 處理javascript中的confirm
public boolean onJsConfirm(WebView view, String url,
String message, final JsResult result) {
Builder builder = new Builder(MainActivity.this);
builder.setTitle("confirm");
builder.setMessage(message);
builder.setPositiveButton(android.R.string.ok,
new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
result.confirm();
}
});
builder.setNegativeButton(android.R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
result.cancel();
}
});
builder.setCancelable(false);
builder.create();
builder.show();
return true;
};
// 設置網頁加載的進度條
public void onProgressChanged(WebView view, int newProgress) {
MainActivity.this.getWindow().setFeatureInt(
Window.FEATURE_PROGRESS, newProgress * 100);
super.onProgressChanged(view, newProgress);
}
// 設置應用程序的標題title
public void onReceivedTitle(WebView view, String title) {
MainActivity.this.setTitle(title);
super.onReceivedTitle(view, title);
}
public void onReachedMaxAppCacheSize(long spaceNeeded,
long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater) {
quotaUpdater.updateQuota(spaceNeeded * 2);
}
});
mWebView.addJavascriptInterface(new JavaScriptInterface(), "demo");
mWebView.loadUrl("file:///android_asset/demo.html");
}
final class JavaScriptInterface {
JavaScriptInterface() {
}
public int mydata() {
return 10;
}
public void DataFromHtml(String resHtml) {
Message m = new Message();
m.obj = resHtml;
h.sendMessage(m);
}
}
Handler h = new Handler() {
public void handleMessage(Message msg) {
Toast.makeText(MainActivity.this, msg.obj + "", Toast.LENGTH_LONG)
.show();
}
};
}

HTML:

<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<meta name="viewport" content="width=device-width, initial-scale=1.0, initial-scale = 1.0 ,user-scalable=no , maximum-scale = 1.0 ">
<link rel="stylesheet" href="css/jquery.mobile.min.css" />
<script src="js/jquery-1.7.1.min.js"></script>
<title>Insert title here</title>
<script type="text/javascript">
$(function() {
$("#btn_getHtml").click(function(event) {
demo.DataFromHtml("From Html");
});
$("#btn_getActivity").click(function(event) {
alert(demo.mydata());
});
});
</script>
<script src="js/jquery.mobile.min.js"></script>
</head>
<body>
<div data-role="page" id="home">
<div data-role="content">
-----------這是一個html頁面----------
<button id="btn_getActivity">
獲取Activity中的數據
</button>
<button id="btn_getHtml">
獲取Html中的數據
</button>
</div>
</div>
</body>
</html>