Android如何判断一个应用在运行
在一个应用中,或一个Service 、Receiver中有时候需要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" />
/** * 判断应用是否在运行 * @param context * @return */ public boolean isRun(Context context){ ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE); List<RunningTaskInfo> list = am.getRunningTasks(100); boolean isAppRunning = false; String MY_PKG_NAME = "com.ad"; //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 for (RunningTaskInfo info : list) { if (info.topActivity.getPackageName().equals(MY_PKG_NAME) || info.baseActivity.getPackageName().equals(MY_PKG_NAME)) { isAppRunning = true; Log.i("ActivityService isRun()",info.topActivity.getPackageName() + " info.baseActivity.getPackageName()="+info.baseActivity.getPackageName()); break; } } Log.i("ActivityService isRun()", "com.ad 程序 ...isAppRunning......"+isAppRunning); return isAppRunning; }
Android系统内部状态信息的相关api:
得到ActivityManager :
ActivityManager activityManager = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE)
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); }
/**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 ; }
/** * 得到所有的Launcher */ 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 :
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:
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; }