Android用于校验集合参数的小封装示例

/** * Created by Jlanglang on 2017/9/4 0004. */public class SimpleParams extends HashMap<String, Object> { //这里放key,与校验失败后的提示内容 private HashMap<Object, String> checkParams = new HashMap<>(); public static SimpleParams create() { return new SimpleParams(); } //返回this,链式编程 public SimpleParams putP(String key, Object value) { this.putP(key, value, ""); return this; } public SimpleParams putP(String key, Object value, String emptyMessage) { this.put(key, value); checkParams.put(key, emptyMessage); return this; } /** * 检查params * * @param context * @return */ public boolean checkValue(Context context) { return checkValue(context, null); } /** * 检查params * * @param context * @return */ public boolean checkValue(Context context, CheckParamsCallback checkParamsCallback) { Set<String> strings = keySet(); for (String str : strings) {  Object value = get(str);  if (value == null || "".equals(value)) {  String s = checkParams.get(str);  //emptyMessage则说明,该参数不校验  if (!TextUtils.isEmpty(s)) {   //传入回调,自定义处理   if (checkParamsCallback != null) {   checkParamsCallback.callBack(s);   } else {   //默认Toast提示.   Toast.makeText(context, s, Toast.LENGTH_SHORT).show();   }   return false;  }  } } return true; } public interface CheckParamsCallback { void callBack(String s); }}