Java tutorial
/** * Sapelli data collection platform: http://sapelli.org * * Copyright 2012-2014 University College London - ExCiteS group * * 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 uk.ac.ucl.excites.sapelli.util; import java.io.File; import android.annotation.TargetApi; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.media.AudioManager; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.BatteryManager; import android.os.Build; import android.os.Vibrator; import android.provider.Settings; import android.support.v4.content.ContextCompat; /** * @author Michalis Vitos, mstevens * */ public final class DeviceControl { protected static final String TAG = "DeviceControl"; protected static final String SAMSUNG_S7710_SD_PATH = "/storage/extSdCard"; /** * Check if the device is connected to Internet * * @param mContext * @return */ public static boolean isOnline(Context context) { ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo netInfo = cm.getActiveNetworkInfo(); if (netInfo != null && netInfo.isConnected()) return true; return false; } /** * Time to wait after exiting the Airplane Mode for GSM to be connected */ public static final int POST_AIRPLANE_MODE_WAITING_TIME = 30; private DeviceControl() // class should not be instantiated { } /** * Check to see if the phone is in AirplaneMode * * @return true if it is */ @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) @SuppressWarnings("deprecation") public static boolean inAirplaneMode(Context context) { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) return Settings.System.getInt(context.getContentResolver(), Settings.System.AIRPLANE_MODE_ON, 0) != 0; else return Settings.Global.getInt(context.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON, 0) != 0; } /** * Disable AirplaneMode and wait for {@code waitingSeconds} seconds for the device to exit */ public static void disableAirplaneModeAndWait(Context context, int waitingSeconds) { disableAirplaneMode(context); // Wait try { Thread.sleep(waitingSeconds * 1000); } catch (Exception e) { Debug.e(e); } } /** * Disable AirplaneMode (Take device out of AirplaneMode) */ public static void disableAirplaneMode(Context context) { setAirplaneMode(context, false); } /** * Enable AirplaneMode (Set the device in AirplaneMode) */ public static void enableAirplaneMode(Context context) { setAirplaneMode(context, true); } /** * Set AirplaneMode * * @param context * @param enabled * (True to set the device in Airplane Mode) */ @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) @SuppressWarnings("deprecation") private static void setAirplaneMode(Context context, boolean enabled) { try { // If airplane mode is on, value 0, else value is 1 if (canToogleAirplaneMode()) { Settings.System.putInt(context.getContentResolver(), Settings.System.AIRPLANE_MODE_ON, enabled ? 1 : 0); // Reload when the mode is changed each time by sending Intent Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED); intent.putExtra("state", enabled); context.sendBroadcast(intent); Debug.d("Airplane mode is: " + (enabled ? "ON" : "OFF")); } } catch (Exception e) { Debug.e("Error upon toggling airplane more.", e); } } public static boolean canToogleAirplaneMode() { return (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) ? true : false; } public static void vibrate(Context context, int durationMS) { Vibrator vibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE); vibrator.vibrate(durationMS); } /** * Returns the current battery level as a percentage. * * @param context * @return */ public static float getBatteryLevel(Context context) { Intent batteryIntent = context.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED)); int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1); int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1); // Error checking just in case. if (level == -1 || scale == -1) { return 50.0f; } return ((float) level / (float) scale) * 100.0f; } /** * Increases the Media Volume * * @param context */ public static void increaseMediaVolume(Context context) { // Get the AudioManager final AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); // Set the volume audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, 0); } /** * Decreases the Media Volume * * @param context */ public static void decreaseMediaVolume(Context context) { // Get the AudioManager final AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); // Set the volume audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER, 0); } /** * Decreases the Media Volume only up to half of the device's max volume * * @param context */ public static void safeDecreaseMediaVolume(Context context) { // Get the volume final AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); final int currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC); final int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC); final int minVolume = maxVolume / 2; Debug.d("currentVolume: " + currentVolume); Debug.d("maxVolume: " + maxVolume); Debug.d("minVolume: " + minVolume); if (currentVolume > minVolume) decreaseMediaVolume(context); } /** * Returns absolute paths to application-specific directories on all external storage devices where the application can place persistent files it owns as in * {@link ContextCompat#getExternalFilesDirs(Context, String)}. This method also hard-codes the SD Card path for devices that are not supported in Android * i.e. Samsung Xcover 2 * * @param context * @param type * @return */ public static File[] getExternalFilesDirs(Context context, String type) { // Get the paths ContextCompat File[] paths = ContextCompat.getExternalFilesDirs(context, type); String manufacturer = android.os.Build.MANUFACTURER; String model = android.os.Build.MODEL; // Check if Device is Samsung GT-S7710 (a.k.a. Samsung Galaxy Xcover 2) if (compare(manufacturer, "Samsung") && compare(model, "GT-S7710")) { // Hard code the path of the external SD Card paths = addPath(paths, getSdCardFilesDir(context, SAMSUNG_S7710_SD_PATH)); } return paths; } /** * Return a file with a absolute path to the application-specific directory on the external sd card. The format is * <code>/sdCardPath/Android/data/application package name/files</code> * * @param context * @param sdCardPath * @return */ private static File getSdCardFilesDir(Context context, String sdCardPath) { // Assemble the dir path File sdCardFile = new File(sdCardPath + File.separator + "Android/data" + File.separator + context.getApplicationContext().getPackageName() + File.separator + "files" + File.separator); // Create the path sdCardFile.mkdirs(); return sdCardFile; } /** * Compare if two strings are equal and also perform <code>null</code> and <code>isEmpty()</code> checks * * @param firstString * @param secondString * @return */ private static boolean compare(String firstString, String secondString) { return firstString != null && secondString != null && !firstString.isEmpty() && !secondString.isEmpty() && firstString.equalsIgnoreCase(secondString); } /** * Add an element to the end of a File array * * @param paths * @param path * @return */ public static File[] addPath(File[] paths, File path) { // Create a new paths array File[] newPaths = new File[paths.length + 1]; // Copy the old paths and add the new one at the end of the array System.arraycopy(paths, 0, newPaths, 0, paths.length); newPaths[paths.length] = path; return newPaths; } }