Android 如何判断一个应用在运行

Android 如何判断一个应用在运行 在一个应用中，或一个Service 、Receiver中判断一个应用是否正在运行，以便进行一些相关的处理。这个时候我们需要得到一个ActivityManager，这个Manager顾名思意就是管理Activity的，它有一个方法叫getRunningTasks，可以得到当前系统正在运行的Task的列表，代码如下： ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE); List<RunningTaskInfo> list = am.getRunningTasks(100); for (RunningTaskInfo info : list) { if (info.topActivity.getPackageName().equals(MY_PKG_NAME) && info.baseActivity.getPackageName().equals(MY_PKG_NAME)) { isAppRunning = true; //find it, break break; } }100表示取的最大的任务数，info.topActivity表示当前正在运行的Activity，info.baseActivity表系统后台有此进程在运行，具体要做如何判断就看自已的业务需求。这个类还有更多的方法可以取得系统运行的服务、内存使用情况等的方法，请各位自行查找。有一点要注意，如果想正常运行此方法，请在你的 AndroidManifest.xml 中加入:<uses-permission android:name="android.permission.GET_TASKS" />否则可能会有exception抛出。=====================================//判断应用是否在运行 ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);List<RunningTaskInfo> list = am.getRunningTasks(100);boolean isAppRunning = false;String MY_PKG_NAME = "com.cyberblue.iitag";for (RunningTaskInfo info : list) { if (info.topActivity.getPackageName().equals(MY_PKG_NAME) || info.baseActivity.getPackageName().equals(MY_PKG_NAME)) { isAppRunning = true; Log.i(TAG,info.topActivity.getPackageName() + " info.baseActivity.getPackageName()="+info.baseActivity.getPackageName()); break; }}//运行中才去重启蓝牙，否则会导致安装了这个应用后蓝牙无法关闭if(isAppRunning){ BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (!mBluetoothAdapter.isEnabled()) { // enable()打开蓝牙，这个方法打开蓝牙不会弹出提示 mBluetoothAdapter.enable(); }}================================================Android系统内部状态信息的相关api：得到ActivityManager ：ActivityManager activityManager = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE)这个位查到底是什么信息： ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo(); 获取进程内存状态的信息：Debug.MemoryInfo[] processMemoryInfo = activityManager.getProcessMemoryInfo(processIds); 获取当前运行的service信息：List<RunningServiceInfo> runningServiceInfos = activityManager.getRunningServices(MaxValue); 获取当前运行的任务信息：List<RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(MaxValue);其中runningTaskInfos 的 topActivity就是当前Task的活跃Activity在getRunningTasks()所返回的Task队列中系统会根据这些Task的活跃度有一个排序，越活跃越是靠前。第一个就是当前活动的Task/*** 检测某ActivityUpdate是否在当前Task的栈顶*/public boolean isTopActivy(String cmdName){ ActivityManager manager = (ActivityManager) context.getSystemService(ACTIVITY_SERVICE); List<RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1); String cmpNameTemp = null; if(null != runningTaskInfos){ cmpNameTemp=(runningTaskInfos.get(0).topActivity).toString); Log.e("cmpname","cmpname:"+cmpName); } if(null == cmpNameTemp)return false; return cmpNameTemp.equals(cmdName);}最后在应用中添加所需的权限：<uses-permission android:name="android.permission.GET_TASKS"/>[java] view plaincopy /**get the launcher status */ private boolean isLauncherRunnig(Context context) { boolean result = false ; List<String> names = getAllTheLauncher(); ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE) ; List<ActivityManager.RunningAppProcessInfo> appList = mActivityManager.getRunningAppProcesses() ; for (RunningAppProcessInfo running : appList) { if (running.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) { for (int i = 0; i < names.size(); i++) { if (names.get(i).equals(running.processName)) { result = true ; break; } } } } return result ; } [java] view plaincopy private List<String> getAllTheLauncher(){ List<String> names = null; PackageManager pkgMgt = this.getPackageManager(); Intent it = new Intent(Intent.ACTION_MAIN); it.addCategory(Intent.CATEGORY_HOME); List<ResolveInfo> ra =pkgMgt.queryIntentActivities(it,0); if(ra.size() != 0){ names = new ArrayList<String>(); } for(int i=0;i< ra.size();i++) { String packageName = ra.get(i).activityInfo.packageName; names.add(packageName); } return names; } android 取当前显示的activity是什么ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);ComponentName cn = am.getRunningTasks(1).get(0).topActivity;Log.d("", "pkg:"+cn.getPackageName());Log.d("", "cls:"+cn.getClassName());android 如何判断程序是否在前台运行[java] view plaincopy private boolean isTopActivity(){ List<RunningTaskInfo> tasksInfo = activityManager.getRunningTasks(1); if(tasksInfo.size() > 0){ //应用程序位于堆栈的顶层 if(packageName.equals(tasksInfo.get(0).topActivity.getPackageName())){ return true; } } return false; }