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Android/webview/js有効

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MainActivity.java

import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        WebView webview = new WebView(this);
        webview = (WebView)this.findViewById(R.id.webview1);
        webview.setWebViewClient(new WebViewClient());
        WebSettings setting = webview.getSettings();
        setting.setJavaScriptEnabled(true);
        webview.loadUrl("file:///android_asset/index.html");
    }
}
  • src/main/res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
        <WebView
            android:id="@+id/webview1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
    </LinearLayout>
</android.support.constraint.ConstraintLayout>
  • src/main/assets/index.html
<!DOCTYPE html PUBLIC
        "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script language="javascript">
function sum() {
  document.forms.form1.text1.value = 1 + 2;
}
</script>
</head>
<body>
<form id="form1">
    <input type="button" onclick="sum()" value="sum"/>
    <input id="text1" type="text"/>
</form>
</body>
</html>