Java tutorial
/* * Catroid: An on-device visual programming system for Android devices * Copyright (C) 2010-2017 The Catrobat Team * (<http://developer.catrobat.org/credits>) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * An additional term exception under section 7 of the GNU Affero * General Public License, version 3, is available at * http://developer.catrobat.org/license_additional_term * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package org.catrobat.catroid.ui; import android.annotation.SuppressLint; import android.app.ActionBar; import android.app.DownloadManager; import android.app.ProgressDialog; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.support.v4.content.res.ResourcesCompat; import android.util.Log; import android.view.KeyEvent; import android.webkit.CookieManager; import android.webkit.CookieSyncManager; import android.webkit.DownloadListener; import android.webkit.WebView; import android.webkit.WebViewClient; import org.catrobat.catroid.R; import org.catrobat.catroid.common.Constants; import org.catrobat.catroid.utils.DownloadUtil; import org.catrobat.catroid.utils.ToastUtil; import org.catrobat.catroid.utils.Utils; import java.io.UnsupportedEncodingException; import java.net.URLDecoder; @SuppressLint("SetJavaScriptEnabled") public class WebViewActivity extends BaseActivity { private static final String TAG = WebViewActivity.class.getSimpleName(); public static final String INTENT_PARAMETER_URL = "url"; public static final String ANDROID_APPLICATION_EXTENSION = ".apk"; public static final String MEDIA_FILE_PATH = "media_file_path"; public static final String CALLING_ACTIVITY = "calling_activity"; private static final String FILENAME_TAG = "fname="; private static final String PACKAGE_NAME_WHATSAPP = "com.whatsapp"; private WebView webView; private boolean callMainMenu = false; private String url; private String callingActivity; private ProgressDialog progressDialog; private ProgressDialog webViewLoadingDialog; private Intent resultIntent = new Intent(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_webview); ActionBar actionBar = getActionBar(); actionBar.hide(); Intent intent = getIntent(); url = intent.getStringExtra(INTENT_PARAMETER_URL); if (url == null) { url = Constants.BASE_URL_HTTPS; } callingActivity = intent.getStringExtra(CALLING_ACTIVITY); webView = (WebView) findViewById(R.id.webView); webView.setBackgroundColor( ResourcesCompat.getColor(getResources(), R.color.application_background_color, null)); webView.setWebViewClient(new MyWebViewClient()); webView.getSettings().setJavaScriptEnabled(true); String language = String.valueOf(Constants.CURRENT_CATROBAT_LANGUAGE_VERSION); String flavor = Constants.FLAVOR_DEFAULT; String version = Utils.getVersionName(getApplicationContext()); String platform = Constants.PLATFORM_DEFAULT; webView.getSettings().setUserAgentString( "Catrobat/" + language + " " + flavor + "/" + version + " Platform/" + platform); webView.loadUrl(url); webView.setDownloadListener(new DownloadListener() { @Override public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) { Log.d(WebViewActivity.class.getSimpleName(), "contentDisposition: " + contentDisposition + " " + mimetype); if (getExtensionFromContentDisposition(contentDisposition).contains(Constants.CATROBAT_EXTENSION)) { DownloadUtil.getInstance().prepareDownloadAndStartIfPossible(WebViewActivity.this, url); } else if (url.contains(Constants.LIBRARY_BASE_URL)) { String name = getMediaNameFromUrl(url); String mediaType = getMediaTypeFromContentDisposition(contentDisposition); String fileName = name + getExtensionFromContentDisposition(contentDisposition); String tempPath = null; switch (mediaType) { case Constants.MEDIA_TYPE_LOOK: tempPath = Constants.TMP_LOOKS_PATH; break; case Constants.MEDIA_TYPE_SOUND: tempPath = Constants.TMP_SOUNDS_PATH; } String filePath = Utils.buildPath(tempPath, fileName); resultIntent.putExtra(MEDIA_FILE_PATH, filePath); DownloadUtil.getInstance().prepareMediaDownloadAndStartIfPossible(WebViewActivity.this, url, mediaType, name, filePath, callingActivity); } else { DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url)); request.setTitle(getString(R.string.notification_download_title_pending) + " " + DownloadUtil.getInstance().getProjectNameFromUrl(url)); request.setDescription(getString(R.string.notification_download_pending)); request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, DownloadUtil.getInstance().getProjectNameFromUrl(url) + ANDROID_APPLICATION_EXTENSION); request.setMimeType(mimetype); registerReceiver(onDownloadComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE)); DownloadManager downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE); downloadManager.enqueue(request); } } }); } BroadcastReceiver onDownloadComplete = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { long id = intent.getExtras().getLong(DownloadManager.EXTRA_DOWNLOAD_ID); DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); intent = new Intent(Intent.ACTION_VIEW); intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intent.setDataAndType(downloadManager.getUriForDownloadedFile(id), downloadManager.getMimeTypeForDownloadedFile(id)); startActivity(intent); } }; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) { callMainMenu = false; webView.goBack(); return true; } return super.onKeyDown(keyCode, event); } private class MyWebViewClient extends WebViewClient { @Override public void onPageStarted(WebView view, String urlClient, Bitmap favicon) { if (webViewLoadingDialog == null) { webViewLoadingDialog = new ProgressDialog(view.getContext(), R.style.WebViewLoadingCircle); webViewLoadingDialog.setCancelable(true); webViewLoadingDialog.setCanceledOnTouchOutside(false); webViewLoadingDialog.setProgressStyle(android.R.style.Widget_ProgressBar_Small); webViewLoadingDialog.show(); } if (callMainMenu && urlClient.equals(Constants.BASE_URL_HTTPS)) { Intent intent = new Intent(getBaseContext(), MainMenuActivity.class); startActivity(intent); } } @Override public void onPageFinished(WebView view, String url) { callMainMenu = true; if (webViewLoadingDialog != null) { webViewLoadingDialog.dismiss(); webViewLoadingDialog = null; } } @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { if (url != null && url.startsWith(Constants.WHATSAPP_URI)) { if (isWhatsappInstalled()) { Uri uri = Uri.parse(url); Intent intent = new Intent(Intent.ACTION_VIEW, uri); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP); startActivity(intent); } else { ToastUtil.showError(getApplicationContext(), R.string.error_no_whatsapp); } return true; } else if (checkIfWebViewVisitExternalWebsite(url)) { Uri uri = Uri.parse(url); Intent intent = new Intent(Intent.ACTION_VIEW, uri); startActivity(intent); return true; } return false; } @Override public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) { ConnectivityManager cm = (ConnectivityManager) getBaseContext() .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting(); int errorMessage; if (!isConnected) { errorMessage = R.string.error_internet_connection; } else { errorMessage = R.string.error_unknown_error; } ToastUtil.showError(getBaseContext(), errorMessage); finish(); } private boolean checkIfWebViewVisitExternalWebsite(String url) { // help URL has to be opened in an external browser if ((url.contains(Constants.MAIN_URL_HTTPS) && !url.contains(Constants.CATROBAT_HELP_URL)) || url.contains(Constants.LIBRARY_BASE_URL)) { return false; } return true; } } public void createProgressDialog(String mediaName) { progressDialog = new ProgressDialog(WebViewActivity.this); progressDialog.setTitle(getString(R.string.notification_download_title_pending) + mediaName); progressDialog.setMessage(getString(R.string.notification_download_pending)); progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL); progressDialog.setProgress(0); progressDialog.setMax(100); progressDialog.setProgressNumberFormat(null); progressDialog.show(); } public void updateProgressDialog(long progress) { if (progress == 100) { progressDialog.setProgress(progressDialog.getMax()); setResult(RESULT_OK, resultIntent); progressDialog.dismiss(); finish(); } else { progressDialog.setProgress((int) progress); } } public void dismissProgressDialog() { progressDialog.dismiss(); } public Intent getResultIntent() { return resultIntent; } public void setResultIntent(Intent intent) { resultIntent = intent; } private String getMediaNameFromUrl(String url) { int mediaNameIndex = url.lastIndexOf(FILENAME_TAG) + FILENAME_TAG.length(); String mediaName = url.substring(mediaNameIndex); try { mediaName = URLDecoder.decode(mediaName, "UTF-8"); } catch (UnsupportedEncodingException e) { Log.e(TAG, "Could not decode program name: " + mediaName, e); return null; } return mediaName; } private String getMediaTypeFromContentDisposition(String contentDisposition) { String mediaType = null; for (String extension : Constants.IMAGE_EXTENSIONS) { if (getExtensionFromContentDisposition(contentDisposition).compareTo(extension) == 0) { mediaType = Constants.MEDIA_TYPE_LOOK; } } for (String extention : Constants.SOUND_EXTENSIONS) { if (getExtensionFromContentDisposition(contentDisposition).compareTo(extention) == 0) { mediaType = Constants.MEDIA_TYPE_SOUND; } } return mediaType; } private String getExtensionFromContentDisposition(String contentDisposition) { int extensionIndex = contentDisposition.lastIndexOf('.'); String extension = contentDisposition.substring(extensionIndex); extension = extension.substring(0, extension.length() - 1); return extension; } //taken from http://stackoverflow.com/a/28998241/ @SuppressWarnings("deprecated") @SuppressLint("NewApi") public static void clearCookies(Context context) { if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP_MR1) { CookieSyncManager cookieSyncMngr = CookieSyncManager.createInstance(context); cookieSyncMngr.startSync(); CookieManager cookieManager = CookieManager.getInstance(); cookieManager.removeAllCookie(); cookieManager.removeSessionCookie(); cookieSyncMngr.stopSync(); cookieSyncMngr.sync(); } else { CookieManager.getInstance().removeAllCookies(null); CookieManager.getInstance().flush(); } } private boolean isWhatsappInstalled() { PackageManager packageManager = getPackageManager(); try { packageManager.getPackageInfo(PACKAGE_NAME_WHATSAPP, PackageManager.GET_ACTIVITIES); return true; } catch (PackageManager.NameNotFoundException e) { return false; } } @Override protected void onDestroy() { webView.setDownloadListener(null); super.onDestroy(); } }