其實在前面我寫的《Notification相關(guān)操作》文章里面提了一嘴這個事情,Android 8.0以后啟動Service需要采用context.startForegroundService(intent)的形式啟動,而這個操作會導(dǎo)致一個Service必須啟動一個Notification的問題,如果被要求隱藏這個Notification的話就需要采取一些特殊手段了:
判定Service是否正在后臺運(yùn)行的工具類:
import android.app.ActivityManager;
import android.content.Context;
public class ServiceUtil {
/**
* @param context
* @return
*/
public static boolean isServiceRunning(String strServiceName, Context context) {
ActivityManager manager = (ActivityManager) context.getSystemService(context.ACTIVITY_SERVICE);
for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (strServiceName.equals(service.service.getClassName())) {
return true;
}
}
return false;
}
}
Service本身還是在8.0以上啟動一個Notification,不過啟動之后馬上刪除通道,這樣就能隱藏Notification了
import android.app.Service;
import android.app.NotificationChannel;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.os.Looper;
import android.support.v4.app.NotificationCompat;
public class BuySellService extends Service {
private final IBinder binder = new BuySellBinder();
private NotificationManager manager = null; // 通知管理器
private String notificationChannelId = "channel_1"; // Android8.0以后展示通知需要注冊的通道編號
private String notificationChannelName = "channel_name_1"; // Android8.0以后展示通知需要注冊的通道名稱
private Context context; // 上下文對象
private static final int notification_id = 198564; // 狀態(tài)欄 notification 對象的編號
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};
@Override
public void onCreate() {
super.onCreate();
context = BuySellService.this;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
showNotification();
}
}
@Override
public IBinder onBind(Intent intent) {
return binder;
}
public class BuySellBinder extends Binder {
public BuySellService getService() {
return BuySellService.this;
}
}
// 展示Notification的方法
private void showNotification() {
if (Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
// 創(chuàng)建渠道
createNotificationChannel();
// 展示通知
showHighNotification();
}/** else {
// 展示通知
showSimpleNotification();
}**/
}
// Android8.0以前的版本使用此方法啟動Notification
private void showSimpleNotification() {
Notification notification = new NotificationCompat.Builder(context, notificationChannelId)
.setContentTitle("買賣客戶端")
.setContentText("正在運(yùn)行中...")
/**點(diǎn)擊事件監(jiān)聽器**/
.setContentIntent(PendingIntent.getBroadcast(context, 0, new Intent(ConstantValues.FOREGROUND_NOTIFICATION_CLICKED), 0))
/**消失的監(jiān)聽器**/
.setDeleteIntent(PendingIntent.getBroadcast(context, 0, new Intent(ConstantValues.FOREGROUND_NOTIFICATION_DISMISS), 0))
.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_launcher))
.setSmallIcon(R.mipmap.ic_launcher) //設(shè)置小圖標(biāo),4.x在右邊,5.x在左邊
/**通知產(chǎn)生的時間,會在通知信息里顯示**/
.setWhen(System.currentTimeMillis())
/**設(shè)置該通知優(yōu)先級**/
.setPriority(Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN ? NotificationCompat.PRIORITY_MAX : Notification.PRIORITY_MAX)
/**設(shè)置這個標(biāo)志當(dāng)用戶單擊面板就可以讓通知將自動取消**/
.setAutoCancel(false)
/**設(shè)置他為一個正在進(jìn)行的通知。他們通常是用來表示一個后臺任務(wù),用戶積極參與(如播放音樂)或以某種方式正在等待,因此占用設(shè)備(如一個文件下載,同步操作,主動網(wǎng)絡(luò)連接)**/
.setOngoing(true)
/**向通知添加聲音、閃燈和振動效果的最簡單、最一致的方式是使用當(dāng)前的用戶默認(rèn)設(shè)置,使用defaults屬性,可以組合:**/
/**.setDefaults(Notification.DEFAULT_VIBRATE or Notification.DEFAULT_SOUND)**/
.build();
notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT | Notification.FLAG_NO_CLEAR | Notification.FLAG_FOREGROUND_SERVICE | Notification.FLAG_HIGH_PRIORITY | Notification.FLAG_AUTO_CANCEL;
startForeground(notification_id, notification);
}
// Android8.0以后展示Notification需要創(chuàng)建渠道
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
// 如果設(shè)置成 NotificationManager.IMPORTANCE_HIGH 或者 NotificationManager.IMPORTANCE_DEFAULT 的話會出現(xiàn)提示音,而且無法取消
NotificationChannel channel = new NotificationChannel(notificationChannelId, notificationChannelName, NotificationManager.IMPORTANCE_LOW);
getNotificationManager().createNotificationChannel(channel);
}
}
// Notification管理器
private NotificationManager getNotificationManager() {
if (manager == null) {
manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
}
return manager;
}
// Android8.0以后的版本使用此方法啟動Notification
private void showHighNotification() {
if (Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
Notification notification = new Notification.Builder(context, notificationChannelId)
.setContentTitle("買賣客戶端")
.setContentText("正在運(yùn)行中...")
/**點(diǎn)擊事件監(jiān)聽器**/
.setContentIntent(PendingIntent.getBroadcast(context, 0, new Intent(ConstantValues.FOREGROUND_NOTIFICATION_CLICKED), 0))
/**消失的監(jiān)聽器**/
.setDeleteIntent(PendingIntent.getBroadcast(context, 0, new Intent(ConstantValues.FOREGROUND_NOTIFICATION_DISMISS), 0))
.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_launcher))
.setSmallIcon(R.mipmap.ic_launcher) //設(shè)置小圖標(biāo),4.x在右邊,5.x在左邊
/**通知產(chǎn)生的時間,會在通知信息里顯示**/
.setWhen(System.currentTimeMillis())
.setShowWhen(true)
/**設(shè)置該通知優(yōu)先級**/
.setPriority(Notification.PRIORITY_MAX)
/**設(shè)置這個標(biāo)志當(dāng)用戶單擊面板就可以讓通知將自動取消**/
.setAutoCancel(false)
/**設(shè)置他為一個正在進(jìn)行的通知。他們通常是用來表示一個后臺任務(wù),用戶積極參與(如播放音樂)或以某種方式正在等待,因此占用設(shè)備(如一個文件下載,同步操作,主動網(wǎng)絡(luò)連接)**/
.setOngoing(true)
/**向通知添加聲音、閃燈和振動效果的最簡單、最一致的方式是使用當(dāng)前的用戶默認(rèn)設(shè)置,使用defaults屬性,可以組合:**/
/**.setDefaults(Notification.DEFAULT_VIBRATE or Notification.DEFAULT_SOUND)**/
.build();
notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT | Notification.FLAG_NO_CLEAR | Notification.FLAG_FOREGROUND_SERVICE | Notification.FLAG_HIGH_PRIORITY | Notification.FLAG_AUTO_CANCEL;
startForeground(notification_id , notification);
}
}
// 隱藏Notification
public void hideNotification() {
// 刪除通道
if (Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
if (getNotificationManager().getNotificationChannel(notificationChannelId) != null) {
getNotificationManager().cancel(notification_id);
getNotificationManager().deleteNotificationChannel(notificationChannelId);
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
// 停止前臺服務(wù)--參數(shù):表示是否移除之前的通知
stopForeground(true);
}
}
在Application里面對Service進(jìn)行綁定,然后在絕大部分頁面(最好是BaseActivity)的OnResume方法里面調(diào)用Application里面的方法校驗Service是否存活,這樣就基本上保證Service不會被殺掉了
import android.app.Application;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Build;
import android.os.IBinder;
public class App extends Application {
private static Context context;
private static BuySellServiceConnection serviceConnection;
private static BuySellService serviceController;
@Override
public void onCreate() {
super.onCreate();
context = App.this;
}
public static Context getContext() {
return context;
}
// 隱藏服務(wù)的Notification
public static void hideServiceNotification() {
if (serviceController != null) {
serviceController.hideNotification();
}
}
// 校驗Service的存活狀態(tài)
public static void checkService() {
if (context != null) {
// 判定服務(wù)是否仍然在后臺運(yùn)行
boolean serviceRunning = ServiceUtil.isServiceRunning(BuySellService.class.getName(), context);
if (!serviceRunning) {
Intent buySellIntent = new Intent(context.getApplicationContext(), BuySellService.class);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(buySellIntent );
} else {
context.startService(buySellIntent );
}
if (serviceConnection == null) {
serviceConnection = new BuySellServiceConnection();
}
// 綁定當(dāng)前服務(wù)
context.bindService(new Intent(context, BuySellService.class), serviceConnection, Context.BIND_IMPORTANT);
}
}
}
/**
* 綁定連接需要ServiceConnection
*/
static class BuySellServiceConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
// 這里可以通過IBinder獲取到在Service的onBind方法里面?zhèn)鬟f過來的Binder對象
// serviceController = ProcessConnection.Stub.asInterface(service);
if (service instanceof BuySellService.BuySellBinder) {
serviceController = ((BuySellService.BuySellBinder) service).getService();
}
}
@Override
public void onServiceDisconnected(ComponentName name) {
// 服務(wù)被干掉;連接斷掉的時候走此回調(diào)
checkService();
}
}
}
最后,在登錄完畢之后,執(zhí)行App.checkService(),然后在LoginActivity的OnDestory方法里面執(zhí)行App.hideServiceNotification() 就行了,下次打開,可以在SplashActivity的OnCreate中校驗當(dāng)前是否登錄成功,成功的話SplashActivity的OnCreate中執(zhí)行App.checkService(),在SplashActivity的OnDestory方法里面執(zhí)行App.hideServiceNotification() 就行了;如果要做?;畹脑挘梢栽贐aseActivity的OnResume里面執(zhí)行App.checkService(),在BaseActivity的OnDestory方法里面執(zhí)行App.hideServiceNotification()