正在開發一個地圖程式, 相對於用XML寫安卓介面, 我更願意用這個偷懶的辦法,
就是不用Android內建的MapView, 而是使用之前就已經比較熟悉的Google Maps JavaScript API,
在Android的WebView中載入HTML代碼, 利用Android提供的強大的Java與Js的互動功能,
用網頁作為介面來開發程式,同時也可以用Js回調機器的本地功能比如GPS等.
下面提供一個示範的例子,代碼如下:
1package com.aloong.map;
2
3import android.app.Activity;
4import android.os.Bundle;
5import android.os.Handler;
6import android.webkit.WebSettings;
7import android.webkit.WebView;
8
9public class MyMap extends Activity {
10
11 private static String TAG = MyMap.class.getName();
12 private WebView mWebView;
13 private Handler mHandler;
14 private WebSettings mWebSettings;
15
16 /** *//** Called when the activity is first created. */
17 @Override
18 public void onCreate(Bundle savedInstanceState) {
19 super.onCreate(savedInstanceState);
20 setContentView(R.layout.main);
21
22 mWebView = (WebView) this.findViewById(R.id.webview);
23 mHandler = new Handler();
24
25 // 設定支援JavaScript等
26 mWebSettings = mWebView.getSettings();
27 mWebSettings.setJavaScriptEnabled(true);
28 mWebSettings.setBuiltInZoomControls(true);
29 mWebSettings.setLightTouchEnabled(true);
30 mWebSettings.setSupportZoom(true);
31 mWebView.setHapticFeedbackEnabled(false);
32 // mWebView.setInitialScale(0); // 改變這個值可以設定初始大小
33
34 //重要,用於與頁面互動!
35 mWebView.addJavascriptInterface(new Object() {
36 @SuppressWarnings("unused")
37 public void oneClick(final String locX, final String locY) {//此處的參數可傳入作為js參數
38 mHandler.post(new Runnable() {
39 public void run() {
40 mWebView.loadUrl("javascript:shows(" + locX + "," + locY + ")");
41 }
42 });
43 }
44 }, "demo");//此名稱在頁面中被調用,方法如下:
45 //<body onClick="window.demo.clickOnAndroid(event.pageX,event.pageY)">
46
47 final String mimeType = "text/html";
48 final String encoding = "utf-8";
49 final String html = "";// TODO 從本地讀取HTML檔案
50
51 mWebView.loadDataWithBaseURL("file:///sdcard/", html, mimeType,
52 encoding, "");
53
54 }
55}
運行以上代碼,就可以在程式中開啟自己寫的html頁面.並且實現Java與JavaScript的雙向互動.
我們甚至可以在頁面中使用JQuery之類的架構製作出很好看的效果,而這比寫Android代碼我覺得簡單多了.
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