简单JS交互

建立完之后，里面放入Html，

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".WebviewActivity">

    <Button
        android:id="@+id/btn_js"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="调用" />

    <WebView
        android:id="@+id/web"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

代码

package com.bawei.lmx.a5_4;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.widget.Button;

public class WebviewActivity extends AppCompatActivity {

    private Button btn_js;
    private WebView webview;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);
        btn_js = findViewById(R.id.btn_js);
        webview = findViewById(R.id.web);
        btn_js.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                webview.loadUrl("file:///android_asset/about.html");
                init();
            }
        });
    }

    private void init() {
        AlertDialog.Builder builder = new AlertDialog.Builder(WebviewActivity.this);
        builder.setTitle("弹框");
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
    }

    ;
}