Android 如何判斷一個應用在運行 在一個應用中,或一個Service 、Receiver中判斷一個應用是否正在運行,以便進行一些相關的處理。 這個時候咱們須要獲得一個ActivityManager,這個Manager顧名思意就是管理Activity的,它有一個方法叫getRunningTasks,能夠獲得當前系統正在運行的Task的列表,代碼以下: 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表示取的最大的任務數,info.topActivity表示當前正在運行的Activity,info.baseActivity表系統後臺有此進程在運行,具體要作如何判斷就看自已的業務需求。這個類還有更多的方法能夠取得系統運行的服務、內存使用狀況等的方法,請各位自行查找。 有一點要注意,若是想正常運行此方法,請在你的 AndroidManifest.xml 中加入: <uses-permission android:name="android.permission.GET_TASKS" /> 不然可能會有exception拋出。 ===================================== //判斷應用是否在運行 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; } } //運行中才去重啓藍牙,不然會致使安裝了這個應用後藍牙沒法關閉 if(isAppRunning){ BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (!mBluetoothAdapter.isEnabled()) { // enable()打開藍牙,這個方法打開藍牙不會彈出提示 mBluetoothAdapter.enable(); } } ================================================ Android系統內部狀態信息的相關api: 獲得ActivityManager : ActivityManager activityManager = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE) 這個位查究竟是什麼信息: ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo(); 獲取進程內存狀態的信息: Debug.MemoryInfo[] processMemoryInfo = activityManager.getProcessMemoryInfo(processIds); 獲取當前運行的service信息: List<RunningServiceInfo> runningServiceInfos = activityManager.getRunningServices(MaxValue); 獲取當前運行的任務信息: List<RunningTaskInfo> runningTaskInfos = activityManager.getRunningTasks(MaxValue); 其中runningTaskInfos 的 topActivity就是當前Task的活躍Activity 在getRunningTasks()所返回的Task隊列中系統會根據這些Task的活躍度有一個排序,越活躍越是靠前。第一個就是當前活動的Task /** * 檢測某ActivityUpdate是否在當前Task的棧頂 */ 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); } 最後在應用中添加所需的權限: <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 取當前顯示的activity是什麼 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 如何判斷程序是否在前臺運行 [java] view plaincopy private boolean isTopActivity(){ List<RunningTaskInfo> tasksInfo = activityManager.getRunningTasks(1); if(tasksInfo.size() > 0){ //應用程序位於堆棧的頂層 if(packageName.equals(tasksInfo.get(0).topActivity.getPackageName())){ return true; } } return false; }