这是我的活动。我从SeviceToStartBackgroundService.class开始提供服务，HomeActivity。在这里，我想检查服务是否正在运行，如果运行然后我想停止服务。
package com.example.tracker.activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.tracker.R;
import com.example.tracker.service.BLEService;
import com.example.tracker.service.BackgroundService;
import com.example.tracker.service.BluetoothLeService;
import com.example.tracker.service.SeviceToStartBackgroundService;
public class HomeScreenActivity extends AppCompatActivity {
String TAG="HomeScreenActivity";
public static Intent intent,intent2;
private Intent bluetoothIntent;
int i=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_screen);
}
@Override
protected void onResume() {
super.onResume();
stopServiceMethod();
startService(new Intent(getApplicationContext(),SeviceToStartBackgroundService.class));
}
public void stopServiceMethod(){
Log.e(TAG,"stopServiceMethod()");
stopService(new Intent(this, BackgroundService.class));
stopService(new Intent(this, SeviceToStartBackgroundService.class));
stopService(new Intent(this, BluetoothLeService.class));
stopService(new Intent(this, BLEService.class));
}
}
这是我的SeviceToStartBackgroundService.class。当我从最近的应用中删除应用时，会调用onTaskRemoved(Intent rootIntent)方法。还有一项服务开始，即BackgroundService.class。
package com.example.tracker.service;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
public class SeviceToStartBackgroundService extends Service {
String TAG="SeviceToStartBService";
private BluetoothLeService mBluetoothLeService;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_STICKY;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onTaskRemoved(Intent rootIntent) {
Log.e(getClass().getName(), "App just got removed from Recents!");
startService(new Intent(getApplicationContext(),BackgroundService.class));
}
@Override
public void onDestroy() {
super.onDestroy();
}
}
这是我的BackgroundService.class。当应用程序进入用户交互（前端）时，我想停止此服务。
package com.example.tracker.service;
import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanFilter;
import android.bluetooth.le.ScanSettings;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Handler;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;
import com.example.tracker.R;
import com.example.tracker.utils.SampleGattAttributes;
import com.example.tracker.utils.SharedPreferencesUtils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;
import static android.R.attr.delay;
import static com.shalaka.tracker.constant.SharedFreferencesConstant.KEY_SP_MOBILE_NUMBER;
/**
* Created by greenlantern on 12/9/17.
*/
public class BackgroundService extends Service{
Handler handlerScan=new Handler();
private int scanPeriod;
Context context;
public static String TAG="BackgroundService";
private BluetoothAdapter mBluetoothAdapter;
private boolean mScanning;
private Handler mHandler = new Handler();
public String[] advDataTypes = new String[256];
ArrayList<BluetoothDevice> bluetoothDeviceArrayList=new ArrayList<>();
ArrayList<BluetoothDevice> bluetoothDeviceArrayListTwo=new ArrayList<>();
private static final int REQUEST_ENABLE_BT = 1;
/*--------------Connect to BLE-----------------------------------------------*/
BluetoothGattService gattService4;
public static ArrayList<BluetoothGattCharacteristic> lastCharacteristic;
// AlertDialog.Builder alertDialog;
private float avgRssi = 0.0f;
// private Dialog dialog;
public static BluetoothLeService mBluetoothLeService;
private boolean mConnected = false;
private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics = new ArrayList();
//service and char uuid
private static final int TRACKER_ON_OFF = 2;
private static final UUID TRACER_TRIPPLE_PRESS_SERVICE=UUID.fromString("edfec62e-9910-0bac-5241-d8bda6932a2f");
private static final UUID TRACKER_TRIPPLE_PRESS_CHAR=UUID.fromString("772ae377-b3d2-4f8e-4042-5481d1e0098c");
private static final UUID IMMEDIATE_ALERT_UUID = UUID.fromString("00001802-0000-1000-8000-00805f9b34fb");
private static final UUID ALERT_LEVEL_UUID = UUID.fromString("00002a06-0000-1000-8000-00805f9b34fb");
public static String connectionStatus;
/*-------------------------------------------------------------------------------*/
public static final String PREFS_NAME = "PreferencesFile";
public String[] mData = new String[400];
/*--------for > 21--------------*/
private BluetoothLeScanner mLEScanner;
private ScanSettings settings;
private List<ScanFilter> filters;
private BluetoothGatt mGatt;
public BackgroundService() {
}
public BackgroundService(Context context) {
this.context = context;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
int delay = 10000;
// getting systems default ringtone
handlerScan.postDelayed(new Runnable() {
@Override
public void run() {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_RSSI_UPDATE);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_WRITE_FAILED);
Log.e(TAG,"OnResume()");
getApplicationContext().registerReceiver(mGattUpdateReceiver, intentFilter);
getApplicationContext().bindService(new Intent(getApplicationContext(), BluetoothLeService.class), mServiceConnection, 1);
Toast.makeText(getApplicationContext(),"CALL YOUR METHOD",Toast.LENGTH_LONG).show();
// Use this check to determine whether BLE is supported on the device. Then you can
// selectively disable BLE-related features.
if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
Toast.makeText(context, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
}
// Initializes a Bluetooth adapter. For API level 18 and above, get a reference to
// BluetoothAdapter through BluetoothManager.
final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
// Checks if Bluetooth is supported on the device.
if (mBluetoothAdapter == null) {
Toast.makeText(context, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
return;
}
for (int i = 0; i < 256; i += REQUEST_ENABLE_BT) {
advDataTypes[i] = "Unknown Data Type";
}
advDataTypes[REQUEST_ENABLE_BT] = "Flags";
advDataTypes[2] = "Incomplete List of 16-bit Service Class UUIDs";
advDataTypes[3] = "Complete List of 16-bit Service Class UUIDs";
advDataTypes[4] = "Incomplete List of 32-bit Service Class UUIDs";
advDataTypes[5] = "Complete List of 32-bit Service Class UUIDs";
advDataTypes[6] = "Incomplete List of 128-bit Service Class UUIDs";
advDataTypes[7] = "Complete List of 128-bit Service Class UUIDs";
advDataTypes[8] = "Shortened Local Name";
advDataTypes[9] = "Complete Local Name";
advDataTypes[10] = "Tx Power Level";
advDataTypes[13] = "Class of LocalDevice";
advDataTypes[14] = "Simple Pairing Hash";
advDataTypes[15] = "Simple Pairing Randomizer R";
advDataTypes[16] = "LocalDevice ID";
advDataTypes[17] = "Security Manager Out of Band Flags";
advDataTypes[18] = "Slave Connection Interval Range";
advDataTypes[20] = "List of 16-bit Solicitaion UUIDs";
advDataTypes[21] = "List of 128-bit Solicitaion UUIDs";
advDataTypes[22] = "Service Data";
advDataTypes[23] = "Public Target Address";
advDataTypes[24] = "Random Target Address";
advDataTypes[25] = "Appearance";
advDataTypes[26] = "Advertising Interval";
advDataTypes[61] = "3D Information Data";
advDataTypes[255] = "Manufacturer Specific Data";
scanPeriod = getApplicationContext().getSharedPreferences(PREFS_NAME, 0).getInt("scan_interval", 2000);
scanLeDevice(true);
}
// unRegisterReceicerAndService();
}, 1000);
return START_STICKY;
}
@Override
public void onCreate() {
super.onCreate();
// -------------------Connect Ble--------------------------------------
}
private void scanLeDevice(final boolean enable) {
Log.e(TAG,"scanTrackerDevices");
bluetoothDeviceArrayList.clear();
if (enable) {
// Stops scanning after a pre-defined scan period.
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
int arraySize=bluetoothDeviceArrayListTwo.size();
Log.e(TAG,"bluetoothDeviceArrayListTwo Size in scan :"+arraySize);
for (int i=0;i<bluetoothDeviceArrayListTwo.size();i++){
BluetoothDevice bluetoothDevice=bluetoothDeviceArrayListTwo.get(i);
Log.e(TAG,"Device Name in scan :"+bluetoothDevice.getName());
Log.e(TAG,"Device Address in scan :"+bluetoothDevice.getAddress());
if (i==0){
mBluetoothLeService.connect(bluetoothDevice.getAddress());
}
}
}
}, scanPeriod);
mScanning = true;
mBluetoothAdapter.startLeScan(mLeScanCallback);
} else {
mScanning = false;
mBluetoothAdapter.stopLeScan(mLeScanCallback);
}
}
private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) {
String d = "";
String rd = "";
String h = "0123456789ABCDEF";
int ln = 0;
int i = 0;
while (i < scanRecord.length) {
int x = scanRecord[i] & 255;
rd = new StringBuilder(String.valueOf(rd)).append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) +REQUEST_ENABLE_BT)).toString();
if (i == ln) {
ln = (i + x) + REQUEST_ENABLE_BT;
if (x == 0) {
break;
}
d = new StringBuilder(String.valueOf(d)).append("\r\n Length: ").append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) +REQUEST_ENABLE_BT)).toString();
i += REQUEST_ENABLE_BT;
x = scanRecord[i] & 255;
d = new StringBuilder(String.valueOf(d)).append(", Type :").append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) + REQUEST_ENABLE_BT)).append(" = ").append(advDataTypes[x]).append(", Value: ").toString();
rd = new StringBuilder(String.valueOf(rd)).append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) + REQUEST_ENABLE_BT)).toString();
} else {
d = new StringBuilder(String.valueOf(d)).append(" ").append(h.substring(x / 16, (x / 16) + REQUEST_ENABLE_BT)).append(h.substring(x % 16, (x % 16) +REQUEST_ENABLE_BT)).toString();
}
i += REQUEST_ENABLE_BT;
}
Log.e(TAG,"UUID : "+device.getUuids());
String[] arrayDeviceName=String.valueOf(device.getName()).split(" ");
String deviceName0=arrayDeviceName[0];
// String deviceName1=arrayDeviceName[1];
if (deviceName0.equals("EUROtronic")){
Log.e(TAG,"Device Name :"+device.getName());
bluetoothDeviceArrayListTwo.add(device);
// Log.e(TAG,"Device Address :"+deviceName0);
}
}
};
/*-------------------Connect BLE---------------------------------------------*/
private Handler mHandler2=new Handler();;
public final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action))
{
numberOfRssi = 0;
avgRssi = 0.0f;
mConnected = true;
mHandler2.postDelayed(startRssi, 300);
Log.e(TAG,"ACTION_GATT_CONNECTED");
}
else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
Log.e(TAG,"ACTION_GATT_DISCONNECTED");
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
displayGattServicesForDimmer(mBluetoothLeService.getSupportedGattServices());
Log.e(TAG,"ACTION_GATT_SERVICES_DISCOVERED");
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
Log.e(TAG,"ACTION_DATA_AVAILABLE");
String unknownServiceString = context.getResources().getString(R.string.unknown_service);
displayDimmer2(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
} else if (BluetoothLeService.ACTION_GATT_RSSI_UPDATE.equals(action)) {
} else if (BluetoothLeService.ACTION_GATT_WRITE_FAILED.equals(action)) {
Log.e(TAG,"ACTION_GATT_WRITE_FAILED");
}
}
};
private BluetoothGattCharacteristic mNotifyCharacteristic;
public static ServiceConnection mServiceConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName componentName, IBinder service) {
mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
if (!mBluetoothLeService.initialize()) {
Log.e(TAG, "Unable to initialize Bluetooth");
// getActivity().finish();
}
// mBluetoothLeService.connect(mDeviceAddress);
}
public void onServiceDisconnected(ComponentName componentName) {
mBluetoothLeService = null;
}
};
private boolean notificationActive = true;
private int numberOfRssi = 0;
private Runnable startRssi = new Runnable() {
public void run() {
if (mConnected) {
mBluetoothLeService.readRemoteRssi();
mHandler2.postDelayed(startRssi, 200);
}
}
};
public BluetoothGatt getmGatt() {
return mGatt;
}
private void displayDimmer2(String data){
if (data!=null){
Log.e(TAG,"display Dimmer2"+data);
String sosString = data.substring(0, Math.min(data.length(), 3));
Log.e(TAG,"SOS String :"+sosString);
if (sosString.equals("SOS")){
Intent callIntent = new Intent(Intent.ACTION_CALL);
callIntent.setData(Uri.parse("tel:"+ SharedPreferencesUtils.getStringFromSharedPreferences(KEY_SP_MOBILE_NUMBER,getApplicationContext())));
callIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(callIntent);
}
}
}
/*-------------------------disaplay gatt service for dimmer----------------------*/
private void displayGattServicesForDimmer(List<BluetoothGattService> gattServices) {
if (gattServices != null) {
String unknownServiceString = getResources().getString(R.string.unknown_service);
String unknownCharaString = getResources().getString(R.string.unknown_characteristic);
ArrayList<HashMap<String, String>> gattServiceData = new ArrayList();
ArrayList<ArrayList<HashMap<String, String>>> gattCharacteristicData = new ArrayList();
this.mGattCharacteristics = new ArrayList();
for (BluetoothGattService gattService : gattServices) {
HashMap<String, String> currentServiceData = new HashMap();
String uuid = gattService.getUuid().toString();
currentServiceData.put("NAME", SampleGattAttributes.lookup(uuid, unknownServiceString));
currentServiceData.put("UUID", uuid);
gattServiceData.add(currentServiceData);
ArrayList<HashMap<String, String>> gattCharacteristicGroupData = new ArrayList();
List<BluetoothGattCharacteristic> gattCharacteristics = gattService.getCharacteristics();
ArrayList<BluetoothGattCharacteristic> charas = new ArrayList();
for (BluetoothGattCharacteristic gattCharacteristic : gattCharacteristics) {
charas.add(gattCharacteristic);
HashMap<String, String> currentCharaData = new HashMap();
uuid = gattCharacteristic.getUuid().toString();
currentCharaData.put("NAME", "\t\t\t<<" + SampleGattAttributes.lookup(uuid, unknownCharaString) + ">>");
currentCharaData.put("UUID", "\t\t\tUUID: 0x" + uuid.substring(4, 8) + ", Properties: " + translateProperties(gattCharacteristic.getProperties()));
gattCharacteristicGroupData.add(currentCharaData);
Log.i(TAG,"CUrrent CHARACTERISTIC DATA"+currentCharaData);
Log.i(TAG,"UUID : "+uuid.substring(4, 8));
Log.i(TAG,"Proprties : "+gattCharacteristic.getProperties());
Log.i(TAG,"Translate Proprties : "+translateProperties(gattCharacteristic.getProperties()));
Log.i(TAG,"char list"+gattCharacteristicData.toString());
}
gattService4=gattService;
this.mGattCharacteristics.add(charas);
}
if (mGattCharacteristics.get(3)!=null) {
lastCharacteristic = new ArrayList<>(mGattCharacteristics.get(3));
enableNotifyOfCharcteristicForDimmer(lastCharacteristic);
}
}
}
private String translateProperties(int properties) {
String s = "";
if ((properties & 1) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Broadcast").toString();
}
if ((properties & 2) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Read").toString();
}
if ((properties & 4) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/WriteWithoutResponse").toString();
}
if ((properties & 8) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Write").toString();
}
if ((properties & 16) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Notify").toString();
}
if ((properties & 32) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/Indicate").toString();
}
if ((properties & 64) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/SignedWrite").toString();
}
if ((properties & 128) > 0) {
s = new StringBuilder(String.valueOf(s)).append("/ExtendedProperties").toString();
}
if (s.length() > 1) {
return s.substring(1);
}
return s;
}
// Enable Characteristic for dimmer
public void enableNotifyOfCharcteristicForDimmer(ArrayList<BluetoothGattCharacteristic> lastCharacteristic){
if(mGattCharacteristics!=null) {
checkCharacteristicPresent(lastCharacteristic.get(0));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(0), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+0+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 0 +" :" +lastCharacteristic.get(0).toString());
checkCharacteristicPresent(lastCharacteristic.get(1));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(1), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+1+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 1 +" :" +lastCharacteristic.get(1).toString());
checkCharacteristicPresent(lastCharacteristic.get(2));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(2), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+2+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 2 +" :" +lastCharacteristic.get(2).toString());
checkCharacteristicPresent(lastCharacteristic.get(3));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(3), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+3+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 3 +" :" +lastCharacteristic.get(3).toString());
checkCharacteristicPresent(lastCharacteristic.get(4));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(4), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+4+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 4 +" :" +lastCharacteristic.get(4).toString());
checkCharacteristicPresent(lastCharacteristic.get(5));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(5), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+5+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 5 +" :" +lastCharacteristic.get(5).toString());
checkCharacteristicPresent(lastCharacteristic.get(2));
mBluetoothLeService.setCharacteristicNotification(lastCharacteristic.get(2), true);
notificationActive = true;
Log.e(TAG,"Characteristic index : "+2+":\nM GATT CHARACTERISTIC AT "+"Service 4 : CHAR"+ 2 +" :" +lastCharacteristic.get(2).toString());
}
}
// Check the type of characteristic i.e READ/WRITE/NOTIFY
public void checkCharacteristicPresent(BluetoothGattCharacteristic characteristic) {
int charaProp = characteristic.getProperties();
Log.e(TAG, "checkCharacteristicPresent Prop : " + charaProp);
mBluetoothLeService.setCurrentCharacteristic(characteristic);
if ((charaProp & 2) > 0) {
Log.e(TAG, "CharProp & 2 : " + charaProp);
mBluetoothLeService.readCharacteristic(characteristic);
}
if ((charaProp & 16) > 0) {
Log.e(TAG, "CharProp & 16 : " + charaProp);
mNotifyCharacteristic = characteristic;
} else {
if (mNotifyCharacteristic != null) {
mBluetoothLeService.setCharacteristicNotification(mNotifyCharacteristic, false);
mNotifyCharacteristic = null;
}
}
if ((charaProp & 8) > 0 || (charaProp & 4) > 0) {
Log.e(TAG, "CharProp & 4 : " + charaProp);
} else {
Log.e(TAG, "Else : " + charaProp);
}
}
public void disconnectBLEDevice(){
// if (mNotifyCharacteristic != null) {
mBluetoothLeService.disconnect();
// }
}
@Override
public void onDestroy(){
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_SHORT).show();
super.onDestroy();
}
}