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/* | |
* Copyright 2016 Socket Mobile, Inc. | |
* | |
* 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.socketmobile.android.utils; | |
import android.bluetooth.BluetoothAdapter; | |
import android.bluetooth.BluetoothManager; | |
import android.content.Context; | |
import android.content.SharedPreferences; | |
import android.os.Build; | |
/** | |
* A utility class for getting the Bluetooth address | |
* <p> | |
* BluetoothUtils acts as a caching proxy for {@link BluetoothAdapter#getAddress()} so that your | |
* application can continue to programmatically retrieve a device's Bluetooth address even after | |
* the | |
* device is upgraded to Android 6.0 (Marshmallow). | |
*/ | |
public class BluetoothUtils { | |
private static final String PREFS_FILE_KEY = BluetoothUtils.class.getName(); | |
private static final String PREF_BDADDRESS = "BdAddress"; | |
private static final String DUMMY_ADDRESS = "02:00:00:00:00:00"; | |
/** | |
* Returns the Bluetooth address. | |
* <p> | |
* Tries to retrieve the Bluetooth address from {@SharedPreferences} before querying the | |
* {@link BluetoothAdapter} and if the adapter returns a valid address, the address is saved in | |
* {@link SharedPreferences} before it is returned. | |
* <p> | |
* This method creates a private instance of {@link SharedPreferences} for storing and | |
* retrieving the Bluetooth address. To provide your own {@link SharedPreferences} instance, | |
* use {@link #getAddress(Context, SharedPreferences, String)} instead. | |
* | |
* @param context an instance of {@link Context} | |
* @return the Bluetooth address or null if Bluetooth is not supported | |
*/ | |
public static String getAddress(Context context) { | |
return getAddress(context, getSharedPrefs(context), PREF_BDADDRESS); | |
} | |
/** | |
* Returns the Bluetooth address. | |
* <p> | |
* Tries to retrieve the Bluetooth address from the instance of {@SharedPreferences} provided | |
* before querying the {@link BluetoothAdapter} and if the adapter returns a valid address, the | |
* address is saved in {@link SharedPreferences} before it is returned. | |
* | |
* @param context an instance of {@link Context} | |
* @param prefs an instance of {@link SharedPreferences} | |
* @param key the key for storing and retrieving the Bluetooth address in {@code prefs} | |
*/ | |
public static String getAddress(Context context, SharedPreferences prefs, String key) { | |
if (prefs == null) { | |
throw new IllegalArgumentException("SharedPreferences cannot be null"); | |
} | |
String address = prefs.getString(key, null); | |
if (address == null) { | |
address = getAddressFromAdapter(context); | |
if (!DUMMY_ADDRESS.equals(address)) { | |
putAddressIntoSharedPrefs(prefs, address); | |
} | |
} | |
return address; | |
} | |
private static BluetoothAdapter getAdapter(Context context) { | |
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN_MR1) { | |
return BluetoothAdapter.getDefaultAdapter(); | |
} else { | |
BluetoothManager bm = (BluetoothManager) context | |
.getSystemService(Context.BLUETOOTH_SERVICE); | |
if (bm != null) { | |
return bm.getAdapter(); | |
} | |
} | |
return null; | |
} | |
private static String getAddressFromAdapter(Context context) { | |
BluetoothAdapter adapter = getAdapter(context); | |
if (adapter != null) { | |
return adapter.getAddress(); | |
} | |
return null; | |
} | |
private static SharedPreferences getSharedPrefs(Context context) { | |
return context.getSharedPreferences(PREFS_FILE_KEY, Context.MODE_PRIVATE); | |
} | |
private static void putAddressIntoSharedPrefs(SharedPreferences prefs, String address) { | |
SharedPreferences.Editor edit = prefs.edit(); | |
edit.putString(PREF_BDADDRESS, address); | |
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.GINGERBREAD) { | |
edit.commit(); | |
} else { | |
edit.apply(); | |
} | |
} | |
} |
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