[Android Advanced] Intermodulation method between Android js and Android

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1. Create an HTML URL for testing

webView.html

1.<html>
     <head>
         <title>
         </title>
     </head>
    <body>
<input type="button" value="Say hello" onClick="showAndroidToast('Web传递参数到Android')" />

<script type="text/javascript">
    function test(card_mo ,price){
    Android.showtest(card_mo+price);
    }
    function showAndroidToast(toast) {
        Android.showToast(toast);
    }
</script>

   </body>
</html>

2. Create a JavaScriptInterface interface class

package com.ruidde.csndresourcedemo;

import android.content.Context;
import android.webkit.JavascriptInterface;
import android.widget.Toast;

/**
 * Created by Administrator on 2017/1/5.
 */

public class JavaScriptInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    JavaScriptInterface(Context c) {
        mContext = c;
    }
    @JavascriptInterface
    /** Show a toast from the web page */
    public void showToast(String toast) {
        Toast.makeText(mContext, toast+"0000000", Toast.LENGTH_SHORT).show();
    }
    @JavascriptInterface
    /** Show a toast from the web page */
    public void showtest(String toast) {
        Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
    }
}

3. Use in Activity

package com.ruidde.csndresourcedemo;

import android.os.Bundle;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private String card_mo ,price ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        card_mo = "1234565";
        price = "32.00";

        WebView myWebView = (WebView) findViewById(R.id.webview);
        //设置js可用
        WebSettings webSettings = myWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        //注解自定义对象 js用自定义的对象如：Android 来调用Android中方法
        myWebView.addJavascriptInterface(new JavaScriptInterface(this), "Android");
        //网址本地自己写的
        myWebView.loadUrl("file:///android_asset/webView.html");
        //webView网页加载进度
        myWebView.setWebChromeClient(new WebChromeClient()
        {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
                if (newProgress == 100){ //网页加载完成
                    /**
                     *   //这是Android调用js的方法  如：test方法在js中要有（可以给js中传递参数）
                     *   方法在web加载完成后  会调用下面方法来给js传递参数
                     * */
                    view.loadUrl("javascript:test('" + card_mo+ "','" + price+ "')"); //aa是js的函数test()的参数
                }
            }
        }
        );
    }
  }

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