一、源码：
@SuppressLint("SetJavaScriptEnabled")
public void initWebView() {
webView.setWebViewClient(new CusWebViewClient());
webView.setWebChromeClient(new CusWebChromeClient());
WebSettings setting = webView.getSettings();
setting.setJavaScriptEnabled(true);
setting.setAllowFileAccess(true);
String dir = getApplicationContext().getCacheDir().getAbsolutePath();
setting.setDomStorageEnabled(true);// 开启 DOM storage API 功能
setting.setGeolocationEnabled(true);
setting.setUserAgentString("Mozilla/5.0 (Linux; Android 6.0.1; SM-G920V Build/MMB29K) AppleWebKit/537.36 " +
"(KHTML, like Gecko) Chrome/52.0.2743.98 Mobile Safari/537.36");
setting.setRenderPriority(RenderPriority.HIGH);
setting.setCacheMode(WebSettings.LOAD_DEFAULT); // 设置 缓存模式
setting.setAppCachePath(dir);// 设置 Application Caches 缓存目录
// 开启 Application Caches 功能
setting.setAppCacheEnabled(true); // 开启 Application Caches 功能
setting.setDefaultTextEncodingName("UTF-8");// 设置字符编码
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Log.v(TAG, "版本大于21，启动setMixedContentMode(0)");
setting.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW); // 解决http及https混合情况下页面加载问题
} else {
Log.v(TAG, "版本小于21，无须启动setMixedContentMode(0)");
}
// 让网页适配手机
setting.setUseWideViewPort(true);
setting.setLoadWithOverviewMode(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);// 滚动条风格，为0指滚动条不占用空间，直接覆盖在网页上
webView.addJavascriptInterface(new Contact(), "contact");
loadWeb(currentUrl);
}
private class CusWebViewClient extends WebViewClient {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {// 网页页面开始加载的时候
if (WebActivity.this.isFinishing()) {
return;
}
Log.e(TAG, "--onPageStarted()--, url : " + url);
showProgress("加载中");
webView.setEnabled(false);// 当加载网页的时候将网页进行隐藏
super.onPageStarted(view, url, favicon);
}
@Override
public void onPageFinished(WebView view, String url) {// 网页加载结束的时候
Log.e(TAG, "onPageFinished , url : " + url);
hidProgress();
webView.setEnabled(true);
if (!mLoadError) {
webView.setVisibility(View.VISIBLE);
errorWebView.setVisibility(View.GONE);
}
super.onPageFinished(view, url);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) { // 网页加载时的连接的网址
Log.d(TAG, "页面加载href:" + url);
loadWeb(url);
return true;
}
@SuppressWarnings("deprecation")
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Log.e(TAG, "onReceivedError, errorCode : " + errorCode + ", failingUrl : " + failingUrl + ", description : " + description);
if (failingUrl.equals(currentUrl)) {
loadFailtUrl();
}
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
String reqUrl = request.getUrl().toString();
Log.e(TAG, "onReceivedHttpError, reqUrl : " + reqUrl + ", currentUrl : " + currentUrl);
if (reqUrl.equals(currentUrl)) {
loadFailtUrl();
}
}
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
Log.e(TAG, "error : " + error);
// 接受所有网站的证书
handler.proceed();
// 默认是handler.cancel();
// super.onReceivedSslError(view, handler, error);
}
}
static class CusWebChromeClient extends WebChromeClient
{
@Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
return super.onJsAlert(view, url, message, result);
}
@Override
public void onReceivedTitle(WebView view, String title) {
// 404 , 502 Bad Gateway...
Log.e(TAG, "onReceivedTitle : " + title);
super.onReceivedTitle(view, title);
}
}
/*****************
* Android与JS交互接口
**************************/
private final class Contact {
// JavaScript调用此方法
/**
* 关闭当前的原生界面
*/
@JavascriptInterface
public void goBack() {
// 调用JS中的方法
finish();
}
}
二、Android调用Js：
1.通过loadUrl()：
// 此方法能调用js函数，但无法直接获取js函数的返回值。需要js再调用一个android方法把返回值传
// 过来才行
webView.loadUrl("javascript:attentionBtnClick('" + finalButtonTxt + "', '" +
finalButtomId + "')");
2.通过evaluateJavascript()：
// 此方法需要 api>= 19才能用。此法能直接获取js的返回值
webView.evaluateJavascript("getContent()", new ValueCallback() {
@Override
public void onReceiveValue(String value) {
Log.e(TAG, "--- evaluateJavascript --- js 返回值 ： " + value);
showMsg(value, Toast.LENGTH_SHORT);
}
});
三、Js调用Android：
window.contact.goBack();
四、WebView加载https：
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
}
webView.setWebViewClient(new WebViewClient(){
@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler,
SslError error) {
// 接受所有网站的证书
handler.proceed();
// 默认是handler.cancel();
// super.onReceivedSslError(view, handler, error);
}
});
五、WebView加载http及https混合页面（例如，https页面有一个http的图片）：
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Log.v(TAG, "版本大于21，启动setMixedContentMode(0)");
// 解决http及https混合情况下页面加载问题
setting.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
} else {
Log.v(TAG, "版本小于21，无须启动setMixedContentMode(0)");
}