效果如:

Android 使用js调用Java-LMLPHP

主要用到一个接口类:MyObject

package com.example.jsdemo;

import android.content.Context;
import android.support.v7.app.AlertDialog;
import android.webkit.JavascriptInterface;
import android.widget.Toast; public class MyObject {
private Context context;
public MyObject(Context context) {
this.context = context;
} //将显示Toast和对话框的方法暴露给JS脚本调用
@JavascriptInterface
public void showToast(String name) {
Toast.makeText(context, name+"我是后台追加的", Toast.LENGTH_SHORT).show();
} @JavascriptInterface
public void showDialog() {
new AlertDialog.Builder(context)
.setTitle("标题")
.setMessage("我是Java不带参").create().show();
}
}

MainActivity实现如:

package com.example.jsdemo;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.webkit.WebSettings;
import android.webkit.WebView; public class MainActivity extends AppCompatActivity {
private WebView wView; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
wView = (WebView) findViewById(R.id.wView);
wView.loadUrl("file:///android_asset/demo1.html");
WebSettings webSettings = wView.getSettings();
//①设置WebView允许调用js
webSettings.setJavaScriptEnabled(true);
webSettings.setDefaultTextEncodingName("UTF-8");
//②将object对象暴露给Js,调用addjavascriptInterface
wView.addJavascriptInterface(new MyObject(MainActivity.this), "myObj");
}
}

然后是main的布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context=".MainActivity" > <TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="hello_world"
android:id="@+id/textView" />
<WebView
android:id="@+id/wView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp" /> </RelativeLayout>

最后是html文件:

<html>
<head>
<title>Js调用Android</title>
</head> <body>
<input type="button" value="JS调用Java(带参)" onclick="myObj.showToast('我是Js参数~');"/>
<input type="button" value="JS调用Java(不带参)" onclick="myObj.showDialog();"/>
</body>
</html>

源代码下载

05-06 22:32