android和js的相互调用

使用html开发android会是一个流行的趋势,至少现在就有很多公司在android中使用了,我们这些js学的不怎么好的更不能落伍了:

android查询通话记录后调用js显示 android调js 点击拍照可将图片替换成拍照的图片

js调用android的Toast js调android

布局文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"   >    <TextView        android:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <ScrollView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_below="@id/tv"         >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="vertical" >            <WebView                android:id="@+id/webView"                android:layout_width="match_parent"                android:layout_height="wrap_content" />        </LinearLayout>    </ScrollView></RelativeLayout>

html代码:

   <meta http-equiv="Content-Type" content="text/html; charset=GBK"><html><head>      <title>android调用js和js调用android</title>     <script type="text/javascript">              function show(jsondata){                                  var jsonobjs = eval(jsondata);                      var table = document.getElementById("personTable");                      for(var y=0; y<jsonobjs.length; y++){                          var tr = table.insertRow(table.rows.length);                           var td1 = tr.insertCell(0);                          var td2 = tr.insertCell(1);                          td2.align = "center";                          var td3 = tr.insertCell(2);                          td3.align = "center";                          td1.innerHTML = jsonobjs[y].name;                           td2.innerHTML = jsonobjs[y].amount;                           td3.innerHTML = "<a href='javascript:contact.call(\""+ jsonobjs[y].phone+ "\")'>"+ jsonobjs[y].phone+ "</a>";                       }              }                          function funImgSrc(dateImg){            document.getElementById("imgSrc").src=dateImg;            }                    </script>                 <style type="text/css">       #car{        width="30px" ;        height="50px"       }       </style>      </head><body onload="javascript:contact.showcontacts()">   第一次调用html页面   <button id="btn" onClick="javascript:contact.toast('123')">你好</button>   <table  border="0" width="100%" id="personTable" cellspacing="0"><tr>                  <td width="30%" align="center">存款</td>                  <td align="center">电话</td>             </tr>    </table>   <br/><button  id="car"  onClick="javascript:contact.Carmeps()">点击拍照将下面的图片换掉</button><br/><img id="imgSrc" src="http://img.ycwb.com/news/attachement/jpg/site2/20120904/001e90704bd511affd1840.jpg"  alt="上海鲜花港 - 郁金香"  /></body></html>

操作的代码:加载本地的html代码

下面设计到的技术点有json的组装,WebView ,内容提供者,子线成和主线程的通信,android调用js,js调用android代码

public class MainActivity extends Activity {private WebView webView;private Handler handler;private List<user> listUser=null;@SuppressLint("SetJavaScriptEnabled")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.fragment_main);init();listUser= new ArrayList<MainActivity.user>();handler = new Handler() {@Overridepublic void handleMessage(Message msg) {if(msg.what==100){//System.out.println((String)msg.obj);if(listUser!=null&&listUser.size()>0){final JSONArray jsonArray = new JSONArray();for(int n=0;n<listUser.size();n++){user u=listUser.get(n);try{JSONObject jsonobj = new JSONObject();jsonobj.put("phone", u.getUserphone());jsonobj.put("name", u.getUsername());jsonobj.put("amount",u.getAcc());jsonArray.put(jsonobj);}catch(Exception e){e.printStackTrace();}}webView.loadUrl("javascript:show('" + jsonArray + "')");System.out.println(jsonArray);}}}};}@SuppressLint("JavascriptInterface")void init() {webView = (WebView) findViewById(R.id.webView);webView.requestFocus();WebSettings webSettings = webView.getSettings();webSettings.setJavaScriptEnabled(true);webSettings.setBuiltInZoomControls(true);webSettings.setSupportZoom(true);webSettings.setDomStorageEnabled(true);// webSettings.setPluginState(true);webSettings.setUseWideViewPort(true);webSettings.setLoadWithOverviewMode(true);webSettings.setSupportZoom(true);webSettings.setBuiltInZoomControls(true);webSettings.setTextSize(WebSettings.TextSize.LARGER);//设置字体//webSettings.setLayoutAlgorithm(LayoutAlgorithm.NARROW_COLUMNS);//话说是设置适应屏幕,设置了不是想要的效果webView.addJavascriptInterface(new InJavaScriptLocalObj(), "contact");//创建调用js代码的桥梁// webView.loadUrl("http://www.baidu.com");// webView.loadUrl("file:///android_assets/indexfile/index.html");webView.loadUrl("file:///android_asset/index.html");}@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();webView.setWebViewClient(new WebViewClient() {//使用WebView来访问html时,必须重写shouldOverrideUrlLoading方法@Overridepublic boolean shouldOverrideUrlLoading(WebView view, String url) {view.loadUrl(url);return true;}});}//通过@JavascriptInterface来创建js调用android代码和android调用js代码final class InJavaScriptLocalObj {@JavascriptInterface// JavaScriptpublic void call(String phone) { startActivity(new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phone)));Toast.makeText(MainActivity.this, "正在呼叫:"+phone, Toast.LENGTH_LONG).show();}// Html内容提供者查询数据后,将数据给js,js操作html显示数据public void showcontacts() {new Thread(new Runnable() {@Overridepublic void run() {Cursor cursor = MainActivity.this.getContentResolver().query(CallLog.Calls.CONTENT_URI,new String[] { CalLog.Calls.NUMBER,CallLog.Calls.CACHED_NAME, }, null,null, CallLog.Calls.DEFAULT_SORT_ORDER);while (cursor.moveToNext()) {user u = new user();if("".equals(cursor.getString(1))||null==cursor.getString(1)){u.setUsername("百合不是茶..");}else{u.setUsername(cursor.getString(1));}u.setUserphone(cursor.getString(0));u.setAcc(""+cursor.getColumnCount());listUser.add(u);}cursor.close();handler.sendEmptyMessage(100);  }}).start();}//js调用toast的代码格为:javascript:contact.toast("你好")public void toast(String str) {Toast.makeText(MainActivity.this, "js调用android的方法:  --- " + str,Toast.LENGTH_LONG).show();}//js调用其拍照public void Carmeps(){Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); startActivityForResult(intent, 101); }}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(requestCode==101){Uri uri=data.getData();if(uri!=null){webView.loadUrl("javascript:funImgSrc('"+uri+"')");//android调用js修改图}}}// 锟斤拷锟截硷拷拇锟斤拷锟�@Overridepublic void onBackPressed() {// TODO Auto-generated method stub// super.onBackPressed();if (webView != null && webView.canGoBack()) {webView.goBack();} else {MainActivity.this.finish();}}//由于需要在UI中将数据以json的形式给js,所以使用bean来操作class user{private String username;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getUserphone() {return userphone;}public void setUserphone(String userphone) {this.userphone = userphone;}public String getAcc() {return acc;}public void setAcc(String acc) {this.acc = acc;}private String userphone;private String acc;}}

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