NullPointerExceptionの発生源にnullチェックを入れた。

ABVJE_UI_Android/src/jp/agentec/abook/abv/cl/environment/DeviceInfo.java

@@ -82,9 +82,22 @@ public class DeviceInfo {
 	    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
 		//noinspection deprecation(API21から非推奨になった。無視)
 	    List<RunningTaskInfo> list = am.getRunningTasks(1);
+	    if (list != null && list.size() > 0) {
 			ComponentName cn = list.get(0).topActivity;
+			if (cn != null) {
 				String name = cn.getPackageName();
-	    return name.indexOf(context.getPackageName()) > -1;
+				if (name != null) {
+					return name.contains(context.getPackageName());
+				} else {
+					Logger.d(TAG, "packageName is null");
+				}
+			} else {
+				Logger.d(TAG, "ComponentName is null");
+			}
+		} else {
+	    	Logger.d(TAG, "getRunningTasks is empty");
+		}
+	    return false;
 	}
 
 	private static boolean isEmulator() {