Android 点击通知进入正在运行的程序

好久没写文章，今天遇到一个新需求，app正在通话过程切换到后台，点击通知栏的时候 回到通话界面。

直接上代码吧

首先是实现通知的代码

NotificationCompat.Builder notificationBuild =null;
    int NOTIFY_ID = 100;
    NotificationManager mNotificationManager;
    boolean isHasNotification = false;
    android.app.Notification notification;
    /**
     * 显示通知栏
     */
    public void showNotification(String title,String content){
        if (mNotificationManager == null&&!isHasNotification){
            Intent deleteIntent = new Intent(this, NotificationTipsReceiver.class);
            notificationBuild = new NotificationCompat.Builder(this);
            notificationBuild.setAutoCancel(false);//设置能手动取消
            notificationBuild.setOngoing(true);//设置不能取消
            notificationBuild.setContentTitle(title);
            notificationBuild.setSmallIcon(R.mipmap.icon);//设置图标
            notificationBuild.setTicker("小尾巴 正在接单中");
            notificationBuild.setDefaults(android.app.Notification.DEFAULT_ALL);
            notificationBuild.setPriority(android.app.Notification.PRIORITY_MAX);
            PendingIntent pendingIntent = PendingIntent.getBroadcast(this,
                    0, deleteIntent, 0);
            notificationBuild.setContentIntent(pendingIntent);
            mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }
        notification = notificationBuild.build();
        mNotificationManager.notify(NOTIFY_ID, notification);
        isHasNotification = true;
    }

下面是通知点击处理类

public class NotificationTipsReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //判断app进程是否存活
        boolean isApplive = SystemUtil.isAppAlive(context, "com.iol8.te.tr");
        Intent  dialogIntent = new Intent(context, DialogueActivity.class);
dialogIntent.setFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED|Intent.FLAG_ACTIVITY_NEW_TASK);//注意这里是关键  经过测试Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED也可以用Intent.FLAG_ACTIVITY_SINGLE_TOP  也可以做到   具体区别没有去深入测试
        if (isApplive) {
            if (WYIMManager.isDialogue) {
                if (!SystemUtil.isAppRunningForeground(context)){//app在后台运行
                    context.startActivity(dialogIntent);
                }
                return;
            }

        }
    }
}

另外附上一个Intent的flag 启动介绍（感谢这位大神的分享）
Android Intent flag 介绍