Java tutorial
/* * Copyright (C) 2013 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.mb.android.playbackmediator.utils; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.content.SharedPreferences; import android.net.Uri; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Bundle; import android.preference.PreferenceManager; import android.text.TextUtils; import android.widget.Toast; import com.google.android.gms.cast.MediaInfo; import com.google.android.gms.cast.MediaMetadata; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GooglePlayServicesUtil; import com.google.android.gms.common.images.WebImage; import com.mb.android.R; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import static com.mb.android.playbackmediator.utils.LogUtils.LOGE; /** * A collection of utility methods, all static. */ public class Utils { private static final String TAG = com.mb.android.playbackmediator.utils.LogUtils.makeLogTag(Utils.class); private static final String KEY_IMAGES = "images"; private static final String KEY_URL = "movie-urls"; private static final String KEY_CONTENT_TYPE = "content-type"; private static final String KEY_STREAM_TYPE = "stream-type"; private static final String KEY_STREAM_DURATION = "stream-duration"; private static final String KEY_CUSTOM_DATA = "custom-data"; /** * Formats time in milliseconds to hh:mm:ss string format. * * @param millis * @return */ public static String formatMillis(int millis) { String result = ""; int hr = millis / 3600000; millis %= 3600000; int min = millis / 60000; millis %= 60000; int sec = millis / 1000; if (hr > 0) { result += hr + ":"; } if (min >= 0) { if (min > 9) { result += min + ":"; } else { result += "0" + min + ":"; } } if (sec > 9) { result += sec; } else { result += "0" + sec; } return result; } /** * A utility method to show a simple error dialog. The textual content of the dialog is * provided through the passed-in resource id. * * @param context * @param resourceId */ public static final void showErrorDialog(Context context, int resourceId) { //showErrorDialog(context, context.getString(resourceId)); showToast(context.getApplicationContext(), resourceId); } /** * A utility method to show a simple error dialog. * * @param context * @param message The message to be shown in the dialog */ public static final void showErrorDialog(Context context, String message) { new AlertDialog.Builder(context).setTitle(R.string.error).setMessage(message) .setPositiveButton(R.string.ok_button, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }).create().show(); } /** * Shows a (long) toast. * * @param context * @param resourceId */ public static void showToast(Context context, int resourceId) { Toast.makeText(context, context.getString(resourceId), Toast.LENGTH_LONG).show(); } /** * Returns the URL of an image for the {@link MediaInformation} at the given level. Level * should be a number between 0 and <code>n - 1</code> where <code>n</code> is the number of * images for that given item. * * @param info * @param level * @return */ public static String getImageUrl(MediaInfo info, int level) { MediaMetadata mm = info.getMetadata(); if (null != mm && mm.getImages().size() > level) { return mm.getImages().get(level).getUrl().toString(); } return null; } /** * Saves a string value under the provided key in the preference manager. If <code>value</code> * is <code>null</code>, then the provided key will be removed from the preferences. * * @param context * @param key * @param value */ public static void saveStringToPreference(Context context, String key, String value) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); if (null == value) { // we want to remove pref.edit().remove(key).apply(); } else { pref.edit().putString(key, value).apply(); } } public static void saveBooleanToPreference(Context context, String key, Boolean value) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); if (null == value) { // we want to remove pref.edit().remove(key).apply(); } else { pref.edit().putBoolean(key, value).apply(); } } /** * Saves a float value under the provided key in the preference manager. If <code>value</code> * is <code>Float.MIN_VALUE</code>, then the provided key will be removed from the preferences. * * @param context * @param key * @param value */ public static void saveFloatToPreference(Context context, String key, float value) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); if (Float.MIN_VALUE == value) { // we want to remove pref.edit().remove(key).apply(); } else { pref.edit().putFloat(key, value).apply(); } } /** * Saves a long value under the provided key in the preference manager. If <code>value</code> * is <code>Long.MIN_VALUE</code>, then the provided key will be removed from the preferences. * * @param context * @param key * @param value */ public static void saveLongToPreference(Context context, String key, long value) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); if (Long.MIN_VALUE == value) { // we want to remove pref.edit().remove(key).apply(); } else { pref.edit().putLong(key, value).apply(); } } /** * Retrieves a String value from preference manager. If no such key exists, it will return * <code>null</code>. * * @param context * @param key * @return */ public static String getStringFromPreference(Context context, String key) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); return pref.getString(key, null); } /** * Retrieves a float value from preference manager. If no such key exists, it will return * <code>Float.MIN_VALUE</code>. * * @param context * @param key * @return */ public static float getFloatFromPreference(Context context, String key) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); return pref.getFloat(key, Float.MIN_VALUE); } /** * Retrieves a boolean value from preference manager. If no such key exists, it will return the * value provided as <code>defaultValue</code> * * @param context * @param key * @param defaultValue * @return */ public static boolean getBooleanFromPreference(Context context, String key, boolean defaultValue) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); return pref.getBoolean(key, defaultValue); } /** * Retrieves a long value from preference manager. If no such key exists, it will return the * value provided as <code>defaultValue</code> * * @param context * @param key * @param defaultValue * @return */ public static long getLongFromPreference(Context context, String key, long defaultValue) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); return pref.getLong(key, defaultValue); } /** * A utility method to validate that the appropriate version of the Google Play Services is * available on the device. If not, it will open a dialog to address the issue. The dialog * displays a localized message about the error and upon user confirmation (by tapping on * dialog) will direct them to the Play Store if Google Play services is out of date or * missing, or to system settings if Google Play services is disabled on the device. * * @param activity * @return */ public static boolean checkGooglePlayServices(final Activity activity) { final int googlePlayServicesCheck = GooglePlayServicesUtil.isGooglePlayServicesAvailable(activity); switch (googlePlayServicesCheck) { case ConnectionResult.SUCCESS: return true; default: Dialog dialog = GooglePlayServicesUtil.getErrorDialog(googlePlayServicesCheck, activity, 0); dialog.setOnCancelListener(new DialogInterface.OnCancelListener() { @Override public void onCancel(DialogInterface dialogInterface) { activity.finish(); } }); dialog.show(); } return false; } /** * @deprecated See <code>checkGooglePlayServices</code> */ public static boolean checkGooglePlaySevices(final Activity activity) { return checkGooglePlayServices(activity); } /** * Builds and returns a {@link android.os.Bundle} which contains a select subset of data in the * {@link MediaInfo}. Since {@link MediaInfo} is not {@link android.os.Parcelable}, one can use this * container bundle to pass around from one activity to another. * * @param info * @return * @see <code>toMediaInfo()</code> */ public static Bundle fromMediaInfo(MediaInfo info) { if (null == info) { return null; } MediaMetadata md = info.getMetadata(); Bundle wrapper = new Bundle(); wrapper.putString(MediaMetadata.KEY_TITLE, md.getString(MediaMetadata.KEY_TITLE)); wrapper.putString(MediaMetadata.KEY_SUBTITLE, md.getString(MediaMetadata.KEY_SUBTITLE)); wrapper.putString(KEY_URL, info.getContentId()); wrapper.putString(MediaMetadata.KEY_STUDIO, md.getString(MediaMetadata.KEY_STUDIO)); wrapper.putString(KEY_CONTENT_TYPE, info.getContentType()); wrapper.putInt(KEY_STREAM_TYPE, info.getStreamType()); wrapper.putLong(KEY_STREAM_DURATION, info.getStreamDuration()); if (!md.getImages().isEmpty()) { ArrayList<String> urls = new ArrayList<String>(); for (WebImage img : md.getImages()) { urls.add(img.getUrl().toString()); } wrapper.putStringArrayList(KEY_IMAGES, urls); } JSONObject customData = info.getCustomData(); if (null != customData) { wrapper.putString(KEY_CUSTOM_DATA, customData.toString()); } return wrapper; } /** * Builds and returns a {@link MediaInfo} that was wrapped in a {@link Bundle} by * <code>fromMediaInfo</code>. * * @param wrapper * @return * @see <code>fromMediaInfo()</code> */ public static MediaInfo toMediaInfo(Bundle wrapper) { if (null == wrapper) { return null; } MediaMetadata metaData = new MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE); metaData.putString(MediaMetadata.KEY_SUBTITLE, wrapper.getString(MediaMetadata.KEY_SUBTITLE)); metaData.putString(MediaMetadata.KEY_TITLE, wrapper.getString(MediaMetadata.KEY_TITLE)); metaData.putString(MediaMetadata.KEY_STUDIO, wrapper.getString(MediaMetadata.KEY_STUDIO)); ArrayList<String> images = wrapper.getStringArrayList(KEY_IMAGES); if (null != images && !images.isEmpty()) { for (String url : images) { Uri uri = Uri.parse(url); metaData.addImage(new WebImage(uri)); } } String customDataStr = wrapper.getString(KEY_CUSTOM_DATA); JSONObject customData = null; if (!TextUtils.isEmpty(customDataStr)) { try { customData = new JSONObject(customDataStr); } catch (JSONException e) { LOGE(TAG, "Failed to deserialize the custom data string: custom data= " + customDataStr); } } return new MediaInfo.Builder(wrapper.getString(KEY_URL)).setStreamType(wrapper.getInt(KEY_STREAM_TYPE)) .setContentType(wrapper.getString(KEY_CONTENT_TYPE)).setMetadata(metaData).setCustomData(customData) .setStreamDuration(wrapper.getLong(KEY_STREAM_DURATION)).build(); } /** * Returns the SSID of the wifi connection, or <code>null</code> if there is no wifi. * * @param context * @return */ public static String getWifiSsid(Context context) { WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); WifiInfo wifiInfo = wifiManager.getConnectionInfo(); if (null != wifiInfo) { return wifiInfo.getSSID(); } return null; } }