Android判断当前应用程序状态是在前台还是后台

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publicstaticbooleanisBackground(Contextcontext){

Log.d("Nat:isBackground.packageName1",context.getPackageName());

ActivityManageractivityManager=(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);

List<ActivityManager.RunningAppProcessInfo>appProcesses=activityManager.getRunningAppProcesses();

for(ActivityManager.RunningAppProcessInfoappProcess:appProcesses){

Log.d("Nat:isBackground.processName",appProcess.processName);

if(appProcess.processName.equals(context.getPackageName())){

Log.d("Nat:isBackground.importance",String.valueOf(appProcess.importance));

if(appProcess.importance==ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND){

Log.i("后台",appProcess.processName);

returntrue;

}else{

Log.i("前台",appProcess.processName);

returnfalse;

}

}

}

returnfalse;

}

classForegroundCheckTaskextendsAsyncTask<Context,Void,Boolean>{
@Override
protectedBooleandoInBackground(Context...params){
finalContextcontext=params[0].getApplicationContext();
returnisAppOnForeground(context);
}
privatebooleanisAppOnForeground(Contextcontext){
ActivityManageractivityManager=(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo>appProcesses=activityManager.getRunningAppProcesses();
if(appProcesses==null){
returnfalse;
}
finalStringpackageName=context.getPackageName();
Log.d("Nat:isAppOnForeground.packageName",context.getPackageName());
for(ActivityManager.RunningAppProcessInfoappProcess:appProcesses){
Log.d("Nat:isAppOnForeground.processName",appProcess.processName);
if(appProcess.importance==ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND&&appProcess.processName.equals(packageName)){
returntrue;
}
}
returnfalse;
}
}

publicstaticbooleanisForeground(Contextcontext){
Log.d("Nat:isBackground.checkPackageName",context.getPackageName());
ActivityManageram=(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo>runningTasks=am.getRunningTasks(1);
if(runningTasks!=null){
//ThefirstinthelistofRunningTasksisalwaystheforegroundtask.
ActivityManager.RunningTaskInfoforegroundTaskInfo=runningTasks.get(0);
StringforegroundTaskPackageName=foregroundTaskInfo.topActivity.getPackageName();
Log.d("Nat:isBackground.foregroundTaskPackageName",foregroundTaskPackageName);
if(context.getPackageName().equals(foregroundTaskPackageName)){
returntrue;
}
//PackageManagerpm=context.getPackageManager();
//PackageInfoforegroundAppPackageInfo=pm.getPackageInfo(foregroundTaskPackageName,0);
//StringforegroundTaskAppName=foregroundAppPackageInfo.applicationInfo.loadLabel(pm).toString();
}
returnfalse;
}

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