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"/>
- /**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 ;
- }
- 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;
- }