根据包名过滤下载按钮状态

app/src/main/java/com/gh/common/constant/Config.java

@@ -4,6 +4,7 @@ package com.gh.common.constant;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
+import android.support.annotation.Nullable;
 import android.text.TextUtils;
 
 import com.gh.common.util.GsonUtils;
@@ -157,6 +158,7 @@ public class Config {
         mSettingsEntity = settingsEntity;
     }
 
+    @Nullable
     public static SettingsEntity getSettings() {
         if (mSettingsEntity == null) {
             try {