注：在做例子之前要先做好准备工作，在app下新建一个名为：assets的目录（不懂怎么创建的可参考：https://blog.csdn.net/Biegral/article/details/47170037）
assets目录下存放要加载的HTML文件等
有关webView的讲解自行百度，这里直接用例子来大概了解一下：
Xml布局文件：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <WebView android:id="@+id/obd_webview" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1"/> <TextView android:id="@+id/obd_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:text=""/> </LinearLayout>
HTML内容：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<script type="text/javascript">
function actionFromNative(){
document.getElementById("log_msg").innerHTML +=
"<br>Native调用了js函数";
}
function actionFromNativeWithParam(arg){
document.getElementById("log_msg").innerHTML +=
("<br>Native调用了js函数并传递参数："+arg);
}
</script>
</head>
<body>
<p>WebView与Javascript交互</p>
<div>
<button onClick="window.web.actionFromJs()">点击调用Native代码</button>
</div>
<br/>
<div>
<button onClick="window.web.actionFromJsWithParam('come from Js')">点击调用Native代码并传递参数</button>
</div>
<br/>
<div id="log_msg">调用打印信息</div>
</body>
</html>
Android中的逻辑处理：
public class OBDCheckWebView extends AppCompatActivity { private WebView OBDmwebView; private TextView OBDTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_obdcheck_webview); OBDmwebView = this.findViewById(R.id.obd_webview); OBDmwebView.getSettings().setJavaScriptEnabled(true); //启用Javascript OBDmwebView.loadUrl("file:///android_asset/web.html"); //加载文件的路径以及文件名 OBDmwebView.addJavascriptInterface(this,"web"); OBDTextView = this.findViewById(R.id.obd_text); String [] data = {"20190606001","fs301","13024","粤-A888","白色","2019-02-02 15:38:28","338km"}; } //此方法没参数 @android.webkit.JavascriptInterface public void actionFromJs() { runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(OBDCheckWebView.this, "js调用了Native函数", Toast.LENGTH_SHORT).show(); String text = OBDTextView.getText() + " js调用了Native函数"; OBDTextView.setText(text); } }); } //可传递参数 @android.webkit.JavascriptInterface public void actionFromJsWithParam(final String[] str) { runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(OBDCheckWebView.this, "js调用了Native函数传递参数：" + str, Toast.LENGTH_SHORT).show(); String text = OBDTextView.getText() + " js调用了Native函数传递参数：" + str; OBDTextView.setText(text); } }); } }
运行效果如图：
