Android - 优化WebView页面
jopen
8年前
WebView包含基础的HTML显示功能, 使用时, 需要进行多方面的优化.
(1) 常用设置
(2) 网页客户端
(3) 浏览器客户端
(4) 滚动条
(5) 获取网页内容
Code:
package me.chunyu.Pedometer.base; import android.annotation.SuppressLint; import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.webkit.JavascriptInterface; import android.webkit.JsResult; import android.webkit.WebChromeClient; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; /** * 用于控制WebView的View * 由于使用WebView的类型太多，如Activity，Fragment，DialogFragment等 * 因此将WebView的功能独立出来作为一个View * * @author MasaWong * @author wangchenlong */ @SuppressWarnings({"unused", "WeakerAccess"}) public class PedoWebView extends WebView { private static final String TAG = "DEBUG-WCL: " + PedoWebView.class.getSimpleName(); @SuppressWarnings("SpellCheckingInspection") private static final String JS_PROCESS_TAG = "HTMLOUT"; // 用于获得HTML的内容 // 用于获得HTML的内容, 固定格式{@link MyJavaScriptInterface} private static final String HTML_CONTENT = "javascript:window." + JS_PROCESS_TAG + ".processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');"; private ReceivedTitleListener mReceivedTitleListener; private PageFinishedListener mPageFinishedListener; private ReceivedErrorListener mReceivedErrorListener; private UrlLoadingListener mUrlLoadingListener; private JsAlertListener mJsAlertListener; public PedoWebView(Context context) { super(context); if (!isInEditMode()) init(); } public PedoWebView(Context context, AttributeSet attrs) { super(context, attrs, 0); if (!isInEditMode()) init(); } public PedoWebView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // 资源显示 if (!isInEditMode()) init(); } /** * 构造函数，配置WebView */ @SuppressLint("AddJavascriptInterface") public void init() { // clearView() is deprecated, but onBackPressed returns to about:blank //noinspection deprecation clearView(); setWebViewClient(); setWebChromeClient(); setWebViewSettings(); setHorizontalScrollBarEnabled(false); // 滚动条不占位 setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY); addJavascriptInterface(new MyJavaScriptInterface(), JS_PROCESS_TAG); } /** * 配置WebView参数 */ @SuppressLint("SetJavaScriptEnabled") protected void setWebViewSettings() { WebSettings settings = getSettings(); // User settings settings.setJavaScriptEnabled(true); // 允许弹窗 settings.setLoadsImagesAutomatically(true); settings.setUseWideViewPort(true); settings.setLoadWithOverviewMode(false); // Technical settings settings.setSupportMultipleWindows(true); // 支持多窗口 settings.setAppCacheEnabled(true); settings.setDatabaseEnabled(true); settings.setDomStorageEnabled(true); // 优先使用缓存 settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); } /** * 配置WebViewClient来处理网页加载的各种状态 */ protected void setWebViewClient() { WebViewClient webClient = new WebViewClient() { // 重定向会加载多次 @Override public void onPageFinished(WebView view, String url) { getSettings().setBlockNetworkImage(false); if (mPageFinishedListener != null) { mPageFinishedListener.overridePageFinished(view, url); } loadUrl(HTML_CONTENT); // 加载JS内容 } @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { if (mReceivedErrorListener != null) { mReceivedErrorListener.overrideReceivedError(view, errorCode, description, failingUrl); } } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { return mUrlLoadingListener != null && mUrlLoadingListener.overrideUrlLoading(view, url); } }; setWebViewClient(webClient); } /** * 获得JS的内容 */ class MyJavaScriptInterface { @JavascriptInterface @SuppressWarnings("unused") public void processHTML(String html) { Log.d(TAG, "咨询医生的H5页面: " + html); } } /** * 配置WebChromeClient来处理JsAlert，用于从网页取得一些复杂的数据 */ protected void setWebChromeClient() { WebChromeClient webChromeClient = new WebChromeClient() { @Override public void onReceivedTitle(WebView view, String title) { if (mReceivedTitleListener != null) { mReceivedTitleListener.onReceivedTitle(view, title); } } @Override public boolean onJsAlert(WebView view, String url, String message, JsResult result) { return mJsAlertListener != null && mJsAlertListener.overrideJsAlert(view, url, message, result); } }; setWebChromeClient(webChromeClient); } /** * 加载Url * * @param url 需要加载的url */ @Override public void loadUrl(String url) { // 把图片加载放在最后来加载渲染 getSettings().setBlockNetworkImage(true); super.loadUrl(url); } public void setReceivedTitleListener(ReceivedTitleListener receivedTitleListener) { mReceivedTitleListener = receivedTitleListener; } public void setPageFinishedListener(PageFinishedListener pageFinishedListener) { mPageFinishedListener = pageFinishedListener; } public void setReceivedErrorListener(ReceivedErrorListener receivedErrorListener) { mReceivedErrorListener = receivedErrorListener; } public void setUrlLoadingListener(UrlLoadingListener urlLoadingListener) { mUrlLoadingListener = urlLoadingListener; } public void setJsAlertListener(JsAlertListener jsAlertListener) { mJsAlertListener = jsAlertListener; } public interface ReceivedTitleListener { void onReceivedTitle(WebView view, String title); } public interface PageFinishedListener { void overridePageFinished(WebView view, String url); } public interface ReceivedErrorListener { void overrideReceivedError(WebView view, int errorCode, String description, String failingUrl); } public interface UrlLoadingListener { boolean overrideUrlLoading(WebView view, String url); } public interface JsAlertListener { boolean overrideJsAlert(WebView view, String url, String message, JsResult result); } } 参考: http://www.pedant.cn/2014/09/10/webview-optimize-points/
来自： http://blog.csdn.net//caroline_wendy/article/details/48469005