/**
   * 主瀏覽處於棧頂
   * 1.應用處於前臺 重新整理主頁面
   * 2.應用處於後臺 開啟應用  重新整理主頁面
   * 
   * 主瀏覽器不在棧頂
   * 1.應用處於前臺 隱藏登入頁 重新整理主頁面
   * 2.應用處於後臺 開啟應用 隱藏登入頁面 重新整理主頁面
   */

【MyReceiver】

          if (AppUtil.isApplicationBroughtToBackground(context)) {//後臺
              Intent resultIntent = new Intent(context, MainActivity.class
 
);
              resultIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
              resultIntent.putExtra("url", url);
              resultIntent.putExtra("push", "push");
              context.startActivity(resultIntent);
              EventBus.getDefault().post(new EventBusBean("push"
 
, "", "", "", url));
          } else {//前臺
              if (AppUtil.isActivityTop(MainActivity.class, context)) {
                  //棧頂 重新整理主頁面
                  EventBus.getDefault().post(new EventBusBean("push", "", "", "", url));
              } else {
                  //關閉登入頁面 重新整理主頁面
                  //存在的問題 比如主頁面之前開啟過別的頁面 比如手機登入 這時候點選返回健會有記錄 體驗不太好
                  EventBus.getDefault
 
().post(new EventBusBean("push", "", "", "", url));
                  EventBus.getDefault().post(new EventBusBean("finish"));
              }
          }
          LogUtil.e(TAG, "處於後臺？=" + AppUtil.isApplicationBroughtToBackground(context) + "程式執行中？=" + AppUtil.isRunning(context) + "棧頂?=" + AppUtil.isActivityTop(MainActivity.class, context) + "url:" + url);

【AppUtil】判斷app的各種狀態

import android.app.Activity;
import android.app.ActivityManager;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;

import java.util.List;


/**
 * <pre>
 *     author : 
 *     e-mail : 
 *     time   : 2017/11/15
 *     desc   : 程式是否執行 處於前臺還是後臺 等app狀態
 *     version: 1.0
 * </pre>
 */
public class AppUtil {
    /**
     * 判斷當前應用程式處於前臺還是後臺
     */
    public static boolean isApplicationBroughtToBackground(final Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> tasks = am.getRunningTasks(1);
        if (!tasks.isEmpty()) {
            ComponentName topActivity = tasks.get(0).topActivity;
            if (!topActivity.getPackageName().equals(context.getPackageName())) {
                return true;
            }
        }
        return false;
    }

    /**
     * 後臺轉前臺
     *
     * @param context
     */
    public static void notifyAppToFront(Context context, Activity activity) {
        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> taskList = activityManager.getRunningTasks(100);
        for (ActivityManager.RunningTaskInfo task : taskList) {
            //找到當前應用的task，並啟動task的棧頂activity，達到程式切換到前臺
            if (task.topActivity.getPackageName().equals(context.getPackageName())) {
                try {
                    Intent resultIntent = new Intent(context, Class.forName(task.topActivity.getClassName()));
                    resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
                    context.startActivity(resultIntent);
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }
                return;
            }
        }
        //若沒有找到執行的task，使用者結束了task或被系統釋放，則重新啟動activity
        Intent resultIntent = new Intent(context, activity.getClass());
        resultIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
        context.startActivity(resultIntent);
    }

    /**
     * 判斷某activity是否處於棧頂
     * 如果當前應用在前臺好用 後臺有些不靈敏
     *
     * @return true在棧頂 false不在棧頂
     */
    public static boolean isActivityTop(Class cls, Context context) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        String name = manager.getRunningTasks(1).get(0).topActivity.getClassName();
        return name.equals(cls.getName());
    }

    /**
     * 程式是否正在執行
     *
     * @param context
     * @return
     */
    public static boolean isRunning(Context context) {
        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> list = am.getRunningTasks(100);
        for (ActivityManager.RunningTaskInfo info : list) {
            if (info.topActivity.getPackageName().equals("com.tailin.webapps") && info.baseActivity.getPackageName().equals("com.tailin.webapps")) {
                return true;
            }
        }
        return false;
    }
}