在我的应用程序中，我想在webView中显示一些数据，为此我从互联网中找到自定义webView。
但是在此自定义webView 不支持RTL 语言并显示从左到右的文本，但我希望从右到左显示。
自定义webView代码：
public class WebEngine {
private WebView webView;
private Activity mActivity;
private Context mContext;
private Fragment fragment;
public static final int KEY_FILE_PICKER = 554;
private static final String GOOGLE_DOCS_VIEWER = "https://docs.google.com/viewerng/viewer?url=";
//"http://docs.google.com/gview?embedded=true&url=";
// "http://drive.google.com/viewerng/viewer?embedded=true&url=";
private ValueCallback<Uri> mUploadMessage;
private ValueCallback<Uri[]> mFilePathCallback;
private WebListener webListener;
private String downloadUrl;
private VideoView videoView;
private WebChromeClient.CustomViewCallback videoViewCallback;
public WebEngine(WebView webView, Activity activity) {
this.webView = webView;
this.mActivity = activity;
this.mContext = mActivity.getApplicationContext();
videoView = VideoView.getInstance();
}
public WebEngine(WebView webView, Activity activity, Fragment fragment) {
this.webView = webView;
this.mActivity = activity;
this.fragment = fragment;
this.mContext = mActivity.getApplicationContext();
videoView = VideoView.getInstance();
}
public void initWebView() {
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setAppCacheMaxSize(AppConstant.SITE_CACHE_SIZE);
webView.getSettings().setAppCachePath(mContext.getCacheDir().getAbsolutePath());
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAppCacheEnabled(true);
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); // load online by default
//webView.getSettings().setUseWideViewPort(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setDomStorageEnabled(true);
webView.getSettings().setDefaultTextEncodingName("utf-8");
webView.getSettings().setPluginState(WebSettings.PluginState.ON);
//webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
if (!isNetworkAvailable(mContext)) {
webView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
}
/**
* set parameters based on settings
*/
/*if (AppPreference.getInstance(mContext).isZoomEnabled()) {
webView.getSettings().setBuiltInZoomControls(true);
} else {
webView.getSettings().setBuiltInZoomControls(false);
}
boolean cookie = AppPreference.getInstance(mContext).isCookieEnabled();
CookieManager.getInstance().setAcceptCookie(cookie);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
CookieManager.getInstance().setAcceptThirdPartyCookies(webView, cookie);
}
webView.getSettings().setSavePassword(cookie);
webView.getSettings().setSaveFormData(cookie);
*/
if (AppPreference.getInstance(mContext).getTextSize().equals(mContext.getResources().getString(R.string.small_text))) {
webView.getSettings().setTextSize(WebSettings.TextSize.SMALLER);
} else if (AppPreference.getInstance(mContext).getTextSize().equals(mContext.getResources().getString(R.string.default_text))) {
webView.getSettings().setTextSize(WebSettings.TextSize.NORMAL);
} else if (AppPreference.getInstance(mContext).getTextSize().equals(mContext.getResources().getString(R.string.large_text))) {
webView.getSettings().setTextSize(WebSettings.TextSize.LARGER);
}
}
public void initListeners(final WebListener webListener) {
this.webListener = webListener;
webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
webListener.onProgress(newProgress);
}
@Override
public boolean onShowFileChooser(WebView view, ValueCallback<Uri[]> filePath, WebChromeClient.FileChooserParams fileChooserParams) {
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = filePath;
invokeImagePickerActivity();
return true;
}
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType,
String capture) {
mUploadMessage = uploadMsg;
invokeImagePickerActivity();
}
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
mUploadMessage = uploadMsg;
invokeImagePickerActivity();
}
@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
webListener.onPageTitle(webView.getTitle());
}
@Override
public void onShowCustomView(View view, CustomViewCallback callback) {
super.onShowCustomView(view, callback);
videoViewCallback = callback;
videoView.show(mActivity);
videoView.setVideoLayout(view);
}
@Override
public void onHideCustomView() {
super.onHideCustomView();
videoView.dismiss();
videoViewCallback.onCustomViewHidden();
}
});
webView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView webView, String webUrl) {
loadPage(webUrl);
return true;
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
webListener.onStart();
}
@Override
public void onPageFinished(WebView view, String url) {
webListener.onLoaded();
}
});
webView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent,
String contentDisposition, String mimetype,
long contentLength) {
downloadUrl = url;
downloadFile();
}
});
}
public void loadPage(String webUrl) {
if (isNetworkAvailable(mContext)) {
if (webUrl.startsWith("tel:") || webUrl.startsWith("sms:") || webUrl.startsWith("smsto:")
|| webUrl.startsWith("mms:") || webUrl.startsWith("mmsto:")
|| webUrl.startsWith("mailto:") /*|| webUrl.contains("youtube.com")*/
|| webUrl.contains("geo:")) {
invokeNativeApp(webUrl);
} else if (webUrl.contains("?target=blank")) {
invokeNativeApp(webUrl.replace("?target=blank", ""));
} else if (webUrl.endsWith(".doc") || webUrl.endsWith(".docx") || webUrl.endsWith(".xls")
|| webUrl.endsWith(".xlsx") || webUrl.endsWith(".pptx") || webUrl.endsWith(".pdf")) {
webView.loadUrl(GOOGLE_DOCS_VIEWER + webUrl);
webView.getSettings().setBuiltInZoomControls(true);
} else {
webView.loadUrl(webUrl);
}
} else {
webListener.onNetworkError();
}
}
public void loadHtml(String htmlString) {
if (isNetworkAvailable(mContext)) {
if (htmlString.startsWith("tel:") || htmlString.startsWith("sms:") || htmlString.startsWith("smsto:")
|| htmlString.startsWith("mms:") || htmlString.startsWith("mmsto:")
|| htmlString.startsWith("mailto:") /*|| htmlString.contains("youtube.com")*/
|| htmlString.contains("geo:")) {
invokeNativeApp(htmlString);
} else if (htmlString.contains("?target=blank")) {
invokeNativeApp(htmlString.replace("?target=blank", ""));
} else if (htmlString.endsWith(".doc") || htmlString.endsWith(".docx") || htmlString.endsWith(".xls")
|| htmlString.endsWith(".xlsx") || htmlString.endsWith(".pptx") || htmlString.endsWith(".pdf")) {
webView.loadUrl(GOOGLE_DOCS_VIEWER + htmlString);
webView.getSettings().setBuiltInZoomControls(true);
} else {
webView.loadData(htmlString, "text/html; charset=utf-8", "UTF-8");
}
} else {
webListener.onNetworkError();
}
}
public void reloadPage() {
webView.reload();
}
public boolean hasHistory() {
return webView.canGoBack();
}
public void loadPreviousPage() {
webView.goBack();
}
private boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivityManager = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE));
return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
}
public String getCurrentUrl() {
return webView.getUrl();
}
private void invokeNativeApp(String url) {
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
mActivity.startActivity(intent);
}
public void invokeImagePickerActivity() {
if (PermissionUtils.isPermissionGranted(mActivity, PermissionUtils.SD_WRITE_PERMISSIONS, PermissionUtils.REQUEST_WRITE_STORAGE_UPLOAD)) {
Intent chooseImageIntent = FilePicker.getPickFileIntent(mActivity);
if (fragment == null) {
mActivity.startActivityForResult(chooseImageIntent, KEY_FILE_PICKER);
} else {
fragment.startActivityForResult(chooseImageIntent, KEY_FILE_PICKER);
}
}
}
public void uploadFile(Intent data, String filePath) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Uri[] results = null;
if (filePath != null) {
results = new Uri[]{Uri.fromFile(new File(filePath))};//Uri.parse(filePath)};
}
if (results == null) {
String dataString = data.getDataString();
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(results);
mFilePathCallback = null;
}
} else if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.KITKAT) {
Uri result = data == null ? Uri.fromFile(new File(filePath)) : data.getData();
if (mUploadMessage != null) {
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
}
public void cancelUpload() {
if (mFilePathCallback != null) {
mFilePathCallback.onReceiveValue(null);
}
mFilePathCallback = null;
}
public void downloadFile() {
if (PermissionUtils.isPermissionGranted(mActivity, PermissionUtils.SD_WRITE_PERMISSIONS, PermissionUtils.REQUEST_WRITE_STORAGE_DOWNLOAD)) {
DownloadManager.Request request = new DownloadManager.Request(
Uri.parse(downloadUrl));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "Downloading file...");
DownloadManager dm = (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
dm.enqueue(request);
}
}
}
并将此自定义webView用于以下代码的活动：
webView = (WebView) findViewById(R.id.web_view);
webEngine = new WebEngine(webView, mActivity);
webEngine.initWebView();
如何将支持RTL添加到此自定义webView？请帮帮我
答案 0 :(得分：3)
将此代码添加到您的应用程序中：
webView.loadData("<html dir=\"rtl\" lang=\"\"><body>" + htmlString + "</body></html>", "text/html; charset=utf-8", "UTF-8");
我希望能帮到你