安卓学习之幕淘旅游案例

2021-11-13 13:47:08

　　在经过几周的安卓基本控件的学习，在本周我进行了一个小型app的开发，主要是一个类型旅游网站的应用程序。

一、基本的解题思路

　　　　　　　　代码部分主要分为五部分分别是adapter（主要是适配器），entity（实体类）,util(数据),fragment,和几个activit

　　下边主要展示几个部分的代码

　　　　　　adapetr分为两个:

　　　　　　　　　　MainHeaderAdapetr:

package com.eb.imoocmutao.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

import java.util.List;

public class MainHeaderAdAdpater extends PagerAdapter {

    protected Context context;
    protected List<ImageView> images;

    public MainHeaderAdAdpater(Context context, List<ImageView> images) {
        this.context = context;
        this.images = images;
    }

    @Override
    public int getCount() {
        return null!=images?images.size():0;
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
            container.addView(images.get(position));
        return images.get(position);
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
        return view==object;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView(images.get(position));
    }
}

　　和MainMenuViewHolder

package com.eb.imoocmutao.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.eb.imoocmutao.R;
import com.eb.imoocmutao.entity.Menu;

import java.util.List;

public class MainMenuAdapter extends RecyclerView.Adapter<MainMenuViewHolder>{
   protected Context context;
   protected List<Menu>menus;

    public MainMenuAdapter(Context context, List<Menu> menus) {
        this.context = context;
        this.menus = menus;
    }

    @NonNull
    @Override
    public MainMenuViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new MainMenuViewHolder(LayoutInflater.from(context).inflate(R.layout.item_main_menu,null));
    }

    @Override
    public void onBindViewHolder(@NonNull MainMenuViewHolder holder, int position) {
    holder.imageView.setImageResource(menus.get(position).icon);
    holder.textView.setText(menus.get(position).menuName);
    }

    @Override
    public int getItemCount() {
        return null!=menus?menus.size():0;
    }
}

class MainMenuViewHolder extends RecyclerView.ViewHolder{
    public ImageView imageView;
    public TextView textView;

    public MainMenuViewHolder(@NonNull View itemView) {
        super(itemView);

        imageView=itemView.findViewById(R.id.img_menu_icon);
        textView=itemView.findViewById(R.id.text_menu_name);

    }
}

　　和主要的两个fragment

MainFrgament

package com.eb.imoocmutao.fragment;

import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager.widget.ViewPager;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.eb.imoocmutao.R;
import com.eb.imoocmutao.adapter.MainHeaderAdAdpater;
import com.eb.imoocmutao.adapter.MainMenuAdapter;
import com.eb.imoocmutao.util.DataUtil;

/**
 * A simple {@link Fragment} subclass.
 */
public class MainFragment extends Fragment {
    int []icons={R.mipmap.header_pic_ad1,R.mipmap.header_pic_ad2,R.mipmap.header_pic_ad1};
    int []menuicons={R.mipmap.menu_airport,R.mipmap.menu_car,R.mipmap.menu_course,R.mipmap.menu_hatol,R.mipmap.menu_nearby,R.mipmap.me_menu_go,R.mipmap.menu_second_ticket,R.mipmap.menu_train};
    String []menusName;
    RecyclerView recyclerView;
    ViewPager viewPager;
    public MainFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_main, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        menusName=this.getActivity().getResources().getStringArray(R.array.main_menu);

        super.onActivityCreated(savedInstanceState);
        viewPager=getView().findViewById(R.id.vpager_main_header_ad);
        recyclerView=getView().findViewById(R.id.recycleview_main_menu);
        MainHeaderAdAdpater adAdpater=new MainHeaderAdAdpater(getActivity(), DataUtil.getHeaderAddInfo(getActivity(),icons));
        viewPager.setAdapter(adAdpater);
        recyclerView.setLayoutManager(new GridLayoutManager(getActivity(),4));
        MainMenuAdapter mainMenuAdapter=new MainMenuAdapter(getActivity(),DataUtil.getMainMenus(menuicons,menusName));
        recyclerView.setAdapter(mainMenuAdapter);

    }
}

　　还有MeFragment

package com.eb.imoocmutao.fragment;

import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.eb.imoocmutao.LoginActivity;
import com.eb.imoocmutao.R;

/**
 * A simple {@link Fragment} subclass.
 */
public class MeFragment extends Fragment {
    Button button;
    public MeFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_me, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        button=getView().findViewById(R.id.btn_login);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(getActivity(), LoginActivity.class));
            }
        });
    }
}

　　在整个写的过程中我主要最为喜欢的用到了一个闪屏就是例如我们打开某一个app以后会有一个广告页一样持续几秒他其实很简单值是一个代码

运动handler中的delay函数