Android里获取正在前端运行的Activity的包名最好的方法

                                               Android里获取正在前端运行的Activity的包名的方法

使用前提：

1. 此方法只在 android5.0 以上有效。
2. AndroidManifest 中加入下面的权限，这个权限需要应用是系统级别的。

<uses-permission android:name="android.permission.REAL_GET_TASKS" />

代码：

public static String getTopActivityPackageName(Context context) {
        final int PROCESS_STATE_TOP = 2;
        try {
            //通过反射获取私有成员变量processState，稍后需要判断该变量的值
            Field processStateField = ActivityManager.RunningAppProcessInfo.class.getDeclaredField("processState");
            List<ActivityManager.RunningAppProcessInfo> processes = ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE)).getRunningAppProcesses();
            for (ActivityManager.RunningAppProcessInfo process : processes) {
                //判断进程是否为前台进程
                if (process.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                    int state = processStateField.getInt(process);
                    //processState值为2
                    if (state == PROCESS_STATE_TOP) {
                        String[] packageName = process.pkgList;
                        Log.d("wujiang", "getLollipopRecentTask: packageName = " + packageName[0]);
                        return packageName[0];
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return " ";
    }

还可以用下面的方法

    public static boolean isCurrentActivity(Context context) {
        String processActivity = "";
        String dvbActivity = context.getPackageName();
        Log.d("wujiang", "isCurrentActivity: dvbActivity = " + dvbActivity);

        try {
            ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
            //获取正在运行的task列表，其中1表示最近运行的task，通过该数字限制列表中task数目，最近运行的靠前
            List<ActivityManager.RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);

            if (runningTaskInfos != null && runningTaskInfos.size() != 0) {
                processActivity = (runningTaskInfos.get(0).baseActivity).getPackageName();
                Log.d("wujiang", "isCurrentActivity: processActivity = " + processActivity);
            }
        } catch (Exception e) {
            Log.d("wujiang", "isCurrentActivity: error msg = " + e.getMessage());
            processActivity = " ";
        }

        if (dvbActivity.equals(processActivity)) {
            return true;
        }

        return false;
    }

 

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