android调用js方法

爱被打了一巴掌 2022-04-16 21:08 442阅读 0赞

WebViewAcy给到

import android.content.Intent;
    import android.graphics.Bitmap;
    import android.net.http.SslError;
    import android.os.Build;
    import android.text.TextUtils;
    import android.view.View;
    import android.webkit.ConsoleMessage;
    import android.webkit.JavascriptInterface;
    import android.webkit.JsResult;
    import android.webkit.SslErrorHandler;
    import android.webkit.WebChromeClient;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    import android.widget.ImageView;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class WebViewActivity extends BaseActivity {
    
        public WebView mWebView;
        public WebSettings mWebSettings;
        public String title, res;//res传递解密url
        public TextView mTextView;
        public ImageView mImageView;
        public LoadingWindow loadingWindow;//加载dia
    
        @Override
        protected int getLayoutResId() {
            return R.layout.activity_webview;
        }
    
        @Override
        protected void initView() {
            setColor();
            StatusBarLightMode();
    
            mWebView = getView(R.id.mWebView);
            loadingWindow = new LoadingWindow(WebViewActivity.this, mWebView);
    
            title = getIntent().getStringExtra("title");
            mTextView = getView(R.id.center_TV);
            mTextView.setText(title);
            mImageView = getView(R.id.back_IMG);
            mImageView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    finish();
                }
            });
    
            res = getIntent().getStringExtra("res");
    
            mWebSettings = mWebView.getSettings();
            mWebSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    
            /**
             *  Webview在安卓5.0之前默认允许其加载混合网络协议内容
             *  在安卓5.0之后，默认不允许加载http与https混合内容，需要设置webview允许其加载混合网络协议内容
             */
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                mWebView.getSettings().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
            }
    
            mWebSettings = mWebView.getSettings();
            mWebSettings.setSaveFormData(false); // 是否保存产生的数据
            mWebSettings.setDomStorageEnabled(true);
            mWebSettings.setAllowFileAccess(true);
            mWebSettings.setAllowFileAccessFromFileURLs(false);
            mWebSettings.setAllowUniversalAccessFromFileURLs(false);
            mWebSettings.setJavaScriptEnabled(true); // 是否启用JAVA脚本
            mWebSettings.setJavaScriptCanOpenWindowsAutomatically(true);
            mWebSettings.setSupportZoom(true);
            mWebSettings.setBuiltInZoomControls(true); // 是否支持缩放
            mWebSettings.setDisplayZoomControls(false);
    
            mWebSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
            mWebSettings.setUseWideViewPort(true);
            mWebSettings.setLoadWithOverviewMode(true);
            mWebView.setWebChromeClient(new WebViewActivity.MyWebChromeClient());
            mWebView.requestFocusFromTouch();
    
            //java回调js代码，不要忘了@JavascriptInterface这个注解，不然点击事件不起作用
            mWebView.addJavascriptInterface(new JsCallJavaObj() {
    
                @JavascriptInterface
                @Override
                public void toMyFragment() {
                    Intent login = new Intent(WebViewActivity.this, MainActivity.class);
                    login.putExtra("type", 3);
                    startActivity(login);
                    finish();
                }
            }, "app");
    
    
            mWebView.setWebChromeClient(new WebChromeClient());//这行最好不要丢掉
            //该方法解决的问题是打开浏览器不调用系统浏览器，直接用webview打开
            mWebView.setWebViewClient(new WebViewClient() {
                public boolean shouldOverrideUrlLoading(WebView mView, String url) {
                    mView.loadUrl(url);
                    return true;
                }
    
                @JavascriptInterface
                @Override
                public void onPageStarted(WebView view, String u, Bitmap favicon) {
                    super.onPageStarted(view, u, favicon);
    
                    loadingWindow.show();
                }
    
                @JavascriptInterface
                @Override
                public void onPageFinished(WebView view, String url) {
                    super.onPageFinished(view, url);
                    //拦截上海银行回调url
                    //if (url.contains("returnurl/payreturn")) {
                        //注入一段js代码
                        String jsCode = "javascript: (function(){ " +
                                "var btn=document.getElementById('regist_n_submit');" +
                                "btn.onclick=function(){window.app.toMyFragment();} " +
                                "})()";
                        view.loadUrl(jsCode);
                    //}
                    loadingWindow.dismiss();
                }
    
                @JavascriptInterface
                @Override
                public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
    //              super.onReceivedSslError(view, handler, error);//注意这个存在重定向url super方法中存在 默认不安全导致空白页面
                    handler.proceed();
    //              handleMessage(Message msg); 其他处理
                }
            });
            if (!TextUtils.isEmpty(res)) {
                mWebView.loadUrl(res);
            }
        }
    
        // 解决html alert和conse打印不出来的问题
        private class MyWebChromeClient extends WebChromeClient {
            @Override
            public boolean onConsoleMessage(ConsoleMessage cm) {
                MsgUtil.e("test", cm.message() + " -- From line "
                        + cm.lineNumber() + " of "
                        + cm.sourceId());
                return true;
            }
    
            @Override
            public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
                Toast.makeText(WebViewActivity.this, message, Toast.LENGTH_SHORT).show();
                result.confirm();
                //result.cancel();
                return false;
            }
        }
    
        private interface JsCallJavaObj {
            void toMyFragment();
        }
    }

WebView调用setWebChromeClient  的几个方法注意的写在下面

1、Java回调js代码，不要忘了@JavascriptInterface这个注解，不然点击事件不起作用

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNzIxMzIw_size_16_color_FFFFFF_t_70][]

2、在onPageFinished中调用JS的单击事件以及跳转应用的页面

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNzIxMzIw_size_16_color_FFFFFF_t_70 1][]

3、onReceivedSslError方法中要注意的是  注释super(),里面对于重定向 安全页面 默认为不安全、

以上就是解决Android调用JS的一些方法。代码块中的基本都给到了，拿去就可以用。

纸上得来终觉浅，书到用时方恨少。

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