Android判断当前栈顶Activity的包名代码示例

//判断当前是不是桌面 
public static Boolean isHome(Context context) {
String topPackageName = getTopActivityName(context);
//此处做了判断如果得到的是null的话就返回一个true 
return topPackageName == null ? true : getHomesPackageName(context).contains(topPackageName);
}
//得到桌面的包名，包括第三方桌面 
private static List<String  getHomesPackageName(Context context) {
List<String  homePackageNames = new ArrayList< ();
PackageManager packageManager = context.getPackageManager();
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
List<ResolveInfo  resolveInfo = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
for (ResolveInfo info : resolveInfo) {
homePackageNames.add(info.activityInfo.packageName);
}
return homePackageNames;
}
//得到栈顶Activity的名字，注意此处要进行判断，Android在5.0以后Google把getRunningTasks的方法给屏蔽掉了，所以要分开处理 
private static String getTopActivityName(Context context) {
String topActivityPackageName;
ActivityManager manager = (ActivityManager) context.getSystemService(context.ACTIVITY_SERVICE);
if (Build.VERSION.SDK_iNT  = Build.VERSION_CODES.LOLLIPOP) {
//此处要判断用户的安全权限有没有打开，如果打开了就进行获取栈顶Activity的名字的方法 
//当然，我们的要求是如果没打开就不获取了，要不然跳转会影响用户的体验 
if (isSecurityPermissionOpen(context)) {
UsageStatsManager mUsageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
long endTime = System.currentTimeMillis();
long beginTime = endTime - 1000 * 60 * 2;
UsageStats recentStats = null;
List<UsageStats  queryUsageStats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, beginTime, endTime);
if (queryUsageStats == null || queryUsageStats.isEmpty()) {
return null;
}
for (UsageStats usageStats : queryUsageStats) {
if (recentStats == null || recentStats.getLastTimeUsed() < usageStats.getLastTimeUsed()) {
recentStats = usageStats;
}
}
topActivityPackageName = recentStats.getPackageName();
return topActivityPackageName;
} else {
return null;
}
} else {
List<ActivityManager.RunningTaskInfo  taskInfos = manager.getRunningTasks(1);
if (taskInfos.size()   0) 
topActivityPackageName = taskInfos.get(0).topActivity.getPackageName(); else 
return null;
return topActivityPackageName;
}
}
//判断用户对应的安全权限有没有打开 
private static Boolean isSecurityPermissionOpen(Context context) {
long endTime = System.currentTimeMillis();
UsageStatsManager usageStatsManager = (UsageStatsManager) context.getApplicationContext().getSystemService("usagestats");
List<UsageStats  queryUsageStats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_BEST, 0, endTime);
if (queryUsageStats == null || queryUsageStats.isEmpty()) {
return false;
}
return true;
}
//此处是跳转安全权限的跳转代码，如果你判断用户没有开启权限的话可以选择跳转，此处标明~~~ 
//Intent intent = new Intent(Settings.ACTION_USAGE_ACCESS_SETTINGS); 
//startActivity(intent);