网络加载空页面

空页面的显示很常用，所以自己做了一个通用的空页面显示，先看效果图

在有网络的时候正常加载显示，在没有网络的时候自动加载空页面，点击空页面重新加载网络请求的一个功能

1：定义一个xml页面，页面布局是一个iamgeview和一个textview的显示

2：添加辅助类，控制加载空页面和显示隐藏等逻辑

3：在网络回调的时候调用方法显示以及在退出的时候清空缓存

下面是代码

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/root"android:layout_width="match_parent"android:layout_height="match_parent"android:gravity="center"android:orientation="vertical"><ImageViewandroid:id="@+id/img_icon"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:src="@mipmap/empty" /><TextViewandroid:id="@+id/tv_val"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center_horizontal"android:layout_marginTop="@dimen/d51.0"android:text="网络开小差了，点击屏幕重试"android:textSize="@dimen/d43.0" />
</LinearLayout>

View Code

package com.fragmentapp.helper;import android.content.Context;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;import com.fragmentapp.R;/*** Created by liuzhen on 2017/12/28.*/public class EmptyLayout {private Context context;private FrameLayout root;private TextView tv_val;private CallBack callBack;public EmptyLayout(Context context){this.context = context;LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);params.gravity = Gravity.CENTER;root = new FrameLayout(context);root.setLayoutParams(params);View view = LayoutInflater.from(context).inflate(R.layout.layout_error,null);tv_val = view.findViewById(R.id.tv_val);root.addView(view);}public void showEmpty(final ViewGroup group, String val){tv_val.setText(val);group.removeView(root);group.addView(root,root.getLayoutParams());status(group,true);root.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {if (callBack != null)callBack.click();status(group,false);}});}private void status(ViewGroup group,boolean isShow){if (isShow){for (int i = 0;i < group.getChildCount();i++) {View view = group.getChildAt(i);view.setVisibility(View.GONE);}root.setVisibility(View.VISIBLE);//放在后面才能生效}else{for (int i = 0;i < group.getChildCount();i++) {View view = group.getChildAt(i);view.setVisibility(View.VISIBLE);}root.setVisibility(View.GONE);}}public void setCallBack(CallBack callBack){if (this.callBack == null)this.callBack = callBack;}public void clear(){context = null;root.removeAllViews();root = null;callBack = null;}public interface CallBack{void click();}}