js中调用android中的方法

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jack2022 2022-09-28 16:33:32 博主文章分类：Javascript

文章标签 android webview ide 文章分类 Spark 大数据

js中调用android中的方法

有时用h5写的html页面，在android原生开发的app中用webview加载显示，有时需要与android在的代码交互，即调用其中的方法，示例如下：见代码

package com.my.mywebview;  
  
import android.annotation.SuppressLint;  
import android.app.Activity;  
import android.os.Bundle;  
import android.os.Handler;  
import android.view.Menu;  
import android.view.MenuItem;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.webkit.WebSettings;  
import android.webkit.WebView;  
import android.widget.Button;  

  
@SuppressLint("SetJavaScriptEnabled")  
public class MainActivity extends Activity {  
  
    //声明一个webview  
    private WebView mWebView;  
      
    private MyWebViewClient WVClient;  
  
    private WebSettings webSettings;  
      
    private MyWebChromeClient chromeClient;  
      
    //测试Button，忽略就行  
    private Button testBtn;  
  
    //调用JS的Button  
    private Button callJSBtn;  
      
    //双击返回退出应用  
    private long exitTime = 0;   
      
    //Object对象，用来跟JS网页绑定  
    private JSObject  jsobject;  
      
    //android调用JS网页的时候会用到  
    private Handler mHandler = new Handler();  
      
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        initView();  
    }  
  
    private void initView() {  
        // TODO Auto-generated method stub  
        mWebView = (WebView) findViewById(R.id.webview);  
        testBtn = (Button)findViewById(R.id.diyWeb);  
        callJSBtn = (Button)findViewById(R.id.calljs);  
          
        WVClient = new MyWebViewClient();  
        chromeClient = new MyWebChromeClient();  
        jsobject = new JSObject(MainActivity.this);   
          
        webSettings = mWebView.getSettings();  
        webSettings.setJavaScriptEnabled(true);  
        webSettings.setBuiltInZoomControls(true);  
        webSettings.setSavePassword(false);  
          
        //支持多种分辨率，需要js网页支持  
        webSettings.setUserAgentString("mac os");  
        webSettings.setDefaultTextEncodingName("utf-8");  
          
        //显示本地js网页  
        mWebView.loadUrl(StringUrl.TEST_NET);  
          
          
        mWebView.setWebViewClient(WVClient);  
        mWebView.setWebChromeClient(chromeClient);  
          
        //注意第二个参数JsTest，这个是JS网页调用Android方法的一个类似ID的东西  
        mWebView.addJavascriptInterface(jsobject, "JsObject");  
          
        //测试自定义网页，忽略  
        testBtn.setOnClickListener(new OnClickListener() {  
              
            @Override  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                String str = "test my web";  
                mWebView.loadData("<html><body>"+str+"<html><body>", "text/html", "UTF-8");  
            }  
        });  
          
          
        //调用JS网页  
        callJSBtn.setOnClickListener(new OnClickListener() {  
              
            @Override  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                mHandler.post(new Runnable() {  
                      
                    @Override  
                    public void run() {  
                        // TODO Auto-generated method stub  
                        //调用JS中的 函数，当然也可以不传参  
                        mWebView.loadUrl("javascript:androidCallJS('顺便传个参数给JS！')");  
                    }  
                });  
            }  
        });  
          
    }  
      
      
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
  
    @Override  
    public boolean onOptionsItemSelected(MenuItem item) {  
          
        // Handle action bar item clicks here. The action bar will  
        // automatically handle clicks on the Home/Up button, so long  
        // as you specify a parent activity in AndroidManifest.xml.  
        int id = item.getItemId();  
        if (id == R.id.action_settings) {  
            return true;  
        }  
        return super.onOptionsItemSelected(item);  
    }  
  
      
    //单击系统返回键网页回退  
    @Override  
    public void onBackPressed() {  
        // TODO Auto-generated method stub  
        //if (System.currentTimeMillis() - exitTime > 1500) {  
            if (mWebView.canGoBack()) {  
                mWebView.goBack();  
            }/*else { 
                Toast.makeText(this, "再按一次返回键退出", Toast.LENGTH_SHORT).show(); 
            } 
            exitTime = System.currentTimeMillis(); 
        } */  
         else {  
            this.finish();  
        }  
    }  
  
}  


[java] view plain copy
package com.chinaonenet.mywebview;  
  
import android.content.Context;  
import android.util.Log;  
import android.webkit.JavascriptInterface;  
import android.widget.Toast;  
  
public class JSObject {  
        /* 
         * 绑定的object对象 
         * */  
        private Context context;  
        public JSObject(Context context){  
            this.context = context;  
        }  
          
        /*
         * JS调用android的方法
         * @JavascriptInterface仍然必不可少
         * */
        @JavascriptInterface
        public void  ShowPic(String currentPcl,String totalPcl){
            if(TextUtils.isEmpty(totalPcl)){
               return ;
            }
            String[] split = totalPcl.split(",");
            ArrayList<String> stringList = new ArrayList<>();
            for(String s:split){
                stringList.add(s);
            }
            int pos = getPos(currentPcl, stringList);
            Common.imageBrowse(NewsDetail.this,pos,stringList,true);
        }  
}  

//下面是网页里调用的写法 JSObject是java代码中注册的那个类接口，ShowPic是那个要调用的方法

$("img").click(function() {
    JSObject.ShowPic(this.src,str);
});