js与android原生交互

package com.liuhao.mysecond;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;

import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;

import com.liuhao.mysecond.WebView.WebViewActivity;


public class MainActivity extends AppCompatActivity {


    @Override
    protected void onResume() {
        /**
         * 设置为横屏
         */
//        if(getRequestedOrientation()!= ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){
//            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
//        }
        super.onResume();
    }


    @SuppressLint("JavascriptInterface")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final WebView myWebView = findViewById(R.id.WV_Id);
        myWebView.clearCache(true);

        myWebView.getSettings().setJavaScriptEnabled(true);
        myWebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
        myWebView.getSettings().setDomStorageEnabled(true);
        myWebView.getSettings().setAllowFileAccess(true);
        myWebView.addJavascriptInterface(new JavaScriptinterface(this), "android");
        myWebView.loadUrl("http://10.8.106.67:3000/test.html");
        myWebView.setWebViewClient(new MyWebViewClient());


    }


    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    public void sendMessage(View view) {
        WebView myWebView = findViewById(R.id.WV_Id);
        myWebView.evaluateJavascript("javascript:AndroidcallJS()", new ValueCallback<String>() {
            @Override
            public void onReceiveValue(String value) {
                //此处为 js 返回的结果
                Log.i("刘浩：", value);
            }
        });
    }
}

class JavaScriptinterface {
    Context context;

    public JavaScriptinterface(Context c) {
        context = c;
    }

    /**
     * 与js交互时用到的方法，在js里直接调用的
     */
    @JavascriptInterface
    public void click(String ssss) {

        Toast.makeText(context, ssss, Toast.LENGTH_LONG).show();
    }
}

class MyWebViewClient extends WebViewClient {
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override  //WebView代表是当前的WebView
    public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
        //表示在当前的WebView继续打开网页
        view.loadUrl(request.getUrl().toString());
        return true;
    }

    @Override
    public void onPageStarted(WebView view, String url, Bitmap favicon) {
        super.onPageStarted(view, url, favicon);

    }

    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);

    }

}

<div style="margin-top:200px"></div>

<span id="liu" onclick="AndroidcallJS()" href="myapp://">打开微信</span>

<div id="show"></div>

<button id="btn" onclick="window.android.click('77777777777')">掉原生</button>

<script>

function AndroidcallJS(){

document.getElementById("show").innerHTML="Android调用了JS的AndroidcallJS方法"

 

return "99999999999999"

}

//document.getElementById("liu").click()

</script>