Android平台，怎么调用javascript操作网页和js调用系统功能 如何在android平台上使用js直接调用Java方法
\u5982\u4f55\u5728Android\u5e73\u53f0\u4e0a\u4f7f\u7528JS\u76f4\u63a5\u8c03\u7528Java\u65b9\u6cd5\u597d\u4e86\u4e0a\u4ee3\u7801
/*JsInterface.java*/
/*\u8be5\u7c7b\u662fJS\u8c03\u7528JAVA\u7aef\u7684,JAVA\u7aef\u8c03\u7528webview\u4e2d\u7684JS\u5f88\u7b80\u5355\uff0c\u540e\u9762\u4ee3\u7801\u5c06\u7ed9\u51fa*/
[java] view plaincopy
public class JsInterface {
/*interface for javascript to invokes*/
public interface wvClientClickListener {
public void wvHasClickEnvent();
}
private wvClientClickListener wvEnventPro = null;
public void setWvClientClickListener(wvClientClickListener listener) {
wvEnventPro = listener;
}
public void javaFunction() {
if(wvEnventPro != null)
wvEnventPro.wvHasClickEnvent();
}
}
/*Js2JavaActivity.JAVA*/
/*\u7a0b\u5e8f\u5165\u53e3*/
[java] view plaincopy
public class Js2JavaActivity extends Activity{
private Button btn_show,btn_hide;
private WebView wv;
private JsInterface JSInterface2 = new JsInterface();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.js2java);
btn_show = (Button)findViewById(R.id.btn_java2js_show);
btn_hide = (Button)findViewById(R.id.btn_java2js_hide);
wv = (WebView)findViewById(R.id.wv_js2java);
wv.getSettings().setJavaScriptEnabled(true);
wv.addJavascriptInterface(JSInterface2,"JSInterface2");
wv.setWebViewClient(new webviewClient());
wv.loadUrl("file:///android_asset/index.html");
}
class webviewClient extends WebViewClient {
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
btn_show.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "You click show button", 1000).show();
wv.loadUrl(String.format("javascript:java2js(0)"));//\u8fd9\u91cc\u662fjava\u7aef\u8c03\u7528webview\u7684JS
}
});
btn_hide.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "You click hide button", 1000).show();
wv.loadUrl(String.format("javascript:java2js(1)"));//\u8fd9\u91cc\u662fjava\u7aef\u8c03\u7528webview\u7684JS
}
});
JSInterface2.setWvClientClickListener(new webviewClick());//\u8fd9\u91cc\u5c31\u662fjs\u8c03\u7528java\u7aef\u7684\u5177\u4f53\u5b9e\u73b0
}
}
class webviewClick implements wvClientClickListener {
@Override
public void wvHasClickEnvent() {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "link be on click", 1000).show();
}
}
}
/*\u597d\u5427\uff0c\u7167\u987e\u7801\u519c\u9700\u8981\uff0c\u5c06\u5e03\u5c40\u7684\u4e5f\u8d34\u4e0a*/
[html] view plaincopy
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_java2js_show"
android:text="click_show"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_java2js_hide"
android:text="click_hide"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<WebView
android:id="@+id/wv_js2java"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
/*\u6700\u540e\u662fHTML\u6587\u4ef6*/
[html] view plaincopy
function java2js(isHide) {
var x = document.getElementById('div');
if(isHide==0)
x.className = "";
else
x.className = "hide";
}
function js2java() {
JSInterface2.javaFunction();
}
.hide {
display:none;
}
js2java
this is a hide div~~~~
\u4e4b\u524d\u9879\u76ee\u4e5f\u6709\u505a\u8fc7\uff0c\u4eca\u65e5\u6709\u7a7a\u5c31\u590d\u4e60\u4e00\u4e0b....\u4f46\u72af\u4e86\u4e00\u4e2a\u5f88\u4f4e\u7ea7\u9519\u8bef\uff0c\u7adf\u7136\u628aJSInterface\u7c7b\u7684\u6210\u5458\u7ed9static\u4e86\uff0c\u540e\u9762\u8fd8wv.addJavascriptInterface(new JSInterface(),"JSInterface2"); \u6240\u4ee5\u540e\u9762javascript\u8c03\u7528java\u5c31\u51fa\u73b0\u629b\u51faCloneNotSupportedException------\u201c"Class doesn't implement Cloneable"\u201d\u3002\u3002\u597d\u4e86\u4e0a\u4ee3\u7801
/*JsInterface.java*/
/*\u8be5\u7c7b\u662fJS\u8c03\u7528JAVA\u7aef\u7684,JAVA\u7aef\u8c03\u7528webview\u4e2d\u7684JS\u5f88\u7b80\u5355\uff0c\u540e\u9762\u4ee3\u7801\u5c06\u7ed9\u51fa*/
[java] view plaincopy
public class JsInterface {
/*interface for javascript to invokes*/
public interface wvClientClickListener {
public void wvHasClickEnvent();
}
private wvClientClickListener wvEnventPro = null;
public void setWvClientClickListener(wvClientClickListener listener) {
wvEnventPro = listener;
}
public void javaFunction() {
if(wvEnventPro != null)
wvEnventPro.wvHasClickEnvent();
}
}
/*Js2JavaActivity.JAVA*/
/*\u7a0b\u5e8f\u5165\u53e3*/
[java] view plaincopy
public class Js2JavaActivity extends Activity{
private Button btn_show,btn_hide;
private WebView wv;
private JsInterface JSInterface2 = new JsInterface();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.js2java);
btn_show = (Button)findViewById(R.id.btn_java2js_show);
btn_hide = (Button)findViewById(R.id.btn_java2js_hide);
wv = (WebView)findViewById(R.id.wv_js2java);
wv.getSettings().setJavaScriptEnabled(true);
wv.addJavascriptInterface(JSInterface2,"JSInterface2");
wv.setWebViewClient(new webviewClient());
wv.loadUrl("file:///android_asset/index.html");
}
class webviewClient extends WebViewClient {
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
btn_show.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "You click show button", 1000).show();
wv.loadUrl(String.format("javascript:java2js(0)"));//\u8fd9\u91cc\u662fjava\u7aef\u8c03\u7528webview\u7684JS
}
});
btn_hide.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "You click hide button", 1000).show();
wv.loadUrl(String.format("javascript:java2js(1)"));//\u8fd9\u91cc\u662fjava\u7aef\u8c03\u7528webview\u7684JS
}
});
JSInterface2.setWvClientClickListener(new webviewClick());//\u8fd9\u91cc\u5c31\u662fjs\u8c03\u7528java\u7aef\u7684\u5177\u4f53\u5b9e\u73b0
}
}
class webviewClick implements wvClientClickListener {
@Override
public void wvHasClickEnvent() {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), "link be on click", 1000).show();
}
}
}
/*\u597d\u5427\uff0c\u7167\u987e\u7801\u519c\u9700\u8981\uff0c\u5c06\u5e03\u5c40\u7684\u4e5f\u8d34\u4e0a*/
[html] view plaincopy
<LinearLayout xmlns:android="ht tp:/ /schemas.androi d.c om/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_java2js_show"
android:text="click_show"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_java2js_hide"
android:text="click_hide"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="1">
<WebView
android:id="@+id/wv_js2java"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
/*\u6700\u540e\u662fHTML\u6587\u4ef6*/
[html] view plaincopy
function java2js(isHide) {
var x = document.getElementById('div');
if(isHide==0)
x.className = "";
else
x.className = "hide";
}
function js2java() {
JSInterface2.javaFunction();
}
.hide {
display:none;
}
js2java
this is a hide div~~~~
预期效果：1、java编程实现显示一个网页显示（list，list中有电话号码），网页中的数据内容由程序传过去。
2、点击网页中的电话号码部分，调用手机的打电话界面。
具体实现：
1、在assets中定义index.html文件，这个文件中table中的数据由javascript生成
ps：
(1)contactlist(jsons)将由java程序调用
(2)onload="javascript:myjavascript.show():javascript调用java程序,详情见下文
2、下面是java程序代码，首先是布局文件，很简单，就是一个webview
4、MyJavaScript负责提供数据并显示html
至此,java程序与javascript之间的双向调用已经完成了。至于我们预期目标的第2项，只需要:
(1)、在MyJavaScript类中添加方法
Java代码
/*
* 拨打电话方法
*/
ublic void call(final String phone){
Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:" + phone));
text.startActivity(intent);
}
/*
* 拨打电话方法
*/
public void call(final String phone){
Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:" + phone));
context.startActivity(intent);
}
(2)、在index.html中将
Java代码
td3.innerHTML = jsonObj.phone;
td3.innerHTML = jsonObj.phone;
修改为：
Java代码
td3.innerHTML = "<a href=\"javascript:myjavascript.call('"+jsonObj.phone + "')\">" + jsonObj.phone + "</a>";
td3.innerHTML = "<a href=\"javascript:myjavascript.call('"+jsonObj.phone + "')\">" + jsonObj.phone + "</a>";
最后记得加上打电话的权限：
Java代码
<uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>
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