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")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
init();
listUser= new ArrayList<MainActivity.user>();
handler = new Handler() {
@Override
public 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");
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
webView.setWebViewClient(new WebViewClient() {
//使用WebView来访问html时,必须重写shouldOverrideUrlLoading方法
@Override
public 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
// JavaScript
public 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() {
@Override
public 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);
}
}
@Override
protected 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�
@Override
public 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;
}
}注意申请权限
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