PING频道

最新推荐文章于 2024-08-10 12:19:10 发布

原创最新推荐文章于 2024-08-10 12:19:10 发布 · 216 阅读

CC 4.0 BY-SA版权

本博客详细介绍了如何在安卓应用中实现新闻阅读应用的Tab布局与频道管理功能，包括MainActivity中TabLayout和ViewPager的使用，以及ChannelActivity中频道的编辑与添加。通过自定义适配器实现了频道的动态添加和删除。

1.MainActivity

package com.example.lenovo.pingdao;

import android.content.Intent;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private TabLayout tbl;
    private ImageView showAll;
    private ViewPager vp;
    private List<String> stringList;
    private List<Fragment> fragmentList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tbl = findViewById(R.id.tbl);
        showAll = findViewById(R.id.show_all);
        vp = findViewById(R.id.vp);

        stringList = new ArrayList<>();
        stringList.add("头条");
        stringList.add("社会");
        stringList.add("国内");
        stringList.add("国际");
        stringList.add("娱乐");
        stringList.add("体育");
        stringList.add("军事");
        stringList.add("科技");
        stringList.add("财经");
        stringList.add("时尚");

        tbl.setTabMode(TabLayout.MODE_SCROLLABLE);
        tbl.setTabTextColors(ColorStateList.valueOf(Color.BLACK));
        fragmentList = new ArrayList<>();

        for (String s : stringList) {
            tbl.addTab(tbl.newTab().setText(s));
            NewsFragment newsFragment = new NewsFragment();
            fragmentList.add(newsFragment);
        }



        vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return fragmentList.get(position);
            }

            @Override
            public int getCount() {
                return fragmentList.size();
            }

            @Nullable
            @Override
            public CharSequence getPageTitle(int position) {
                return stringList.get(position);
            }
        });

        tbl.setupWithViewPager(vp);


        final ArrayList<String> arrayList = new ArrayList<>();
        arrayList.addAll(stringList);

        //点击加号  跳转频道管理页面
        showAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this,ChannelActivity.class);
                Bundle bundle = new Bundle();
                bundle.putStringArrayList("array",arrayList);
                intent.putExtras(bundle);

                startActivity(intent);
            }
        });

    }
}

Item main_activity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
  android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal">

        <android.support.design.widget.TabLayout
            android:id="@+id/tbl"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="50dp" >

        </android.support.design.widget.TabLayout>

        <ImageView
            android:id="@+id/show_all"
            android:src="@drawable/feedback_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/vp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></android.support.v4.view.ViewPager>


</LinearLayout>

2.ChannelActivity


import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class ChannelActivity extends AppCompatActivity implements View.OnClickListener{

    private ArrayList<String> array;
    private Button btnfinish;
    private TextView txtEdit;
    private GridView mygvChannel;
    private GridView othergvChannel;
    private List<String> recommond;
    private boolean isEdited = false;
    private MyGvAdapter madapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_channel);

        //找控件
        btnfinish = findViewById(R.id.btn_finish);
        txtEdit = findViewById(R.id.txt_edit);
        mygvChannel = findViewById(R.id.mygvChannel);
        othergvChannel = findViewById(R.id.othergvChannel);


        //接收值
        Intent intent = getIntent();
        Bundle bundle = intent.getExtras();
        array = bundle.getStringArrayList("array");

        //给频道管理写适配器
        madapter = new MyGvAdapter(this, array);
          mygvChannel.setAdapter(madapter);

          //给推荐频道写死数据
        recommond = new ArrayList<>();
        recommond.add("特卖");
        recommond.add("直播");
        recommond.add("房产");
        recommond.add("历史");
        recommond.add("旅游");


        //给推荐频道添加设置适配器
        final OthertAdapter othertAdapter = new OthertAdapter(this,recommond);
        othergvChannel.setAdapter(othertAdapter);

        MyGvAdapter.OnDeleteItemClick listener = new MyGvAdapter.OnDeleteItemClick() {
            @Override
            public void OnDeleteItemClick(int position) {

                recommond.add(array.get(position));
                othertAdapter.notifyDataSetChanged();

                array.remove(position);
                madapter.notifyDataSetChanged();
            }
        };


        madapter.setOnDeleteItemClick(listener);

        // 推荐频道里 添加到 我的频道
        othergvChannel.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                array.add(recommond.get(i));
                madapter.notifyDataSetChanged();

                recommond.remove(i);
                othertAdapter.notifyDataSetChanged();

            }
        });


        //点击事件
        txtEdit.setOnClickListener(this);
        btnfinish.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case  R.id.txt_edit:
                isEdited = !isEdited;
                if (isEdited){
                    txtEdit.setText("完成");
                }else {
                    txtEdit.setText("编辑");
                }

                madapter.setEdited(isEdited);

                break;

            case R.id.btn_finish:
                finish();
                break;


        }
    }
}

Item channel_activity

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   android:orientation="vertical">


    <Button
        android:id="@+id/btn_finish"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="完成"/>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:text="我的频道"/>

        <TextView
            android:id="@+id/txt_edit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:textSize="20dp"
            android:textColor="#000000"
            android:text="编辑"/>

    </RelativeLayout>


    <GridView
        android:id="@+id/mygvChannel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:horizontalSpacing="10dp"
        android:numColumns="4"
        ></GridView>

    <TextView
        android:text="推荐频道"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <GridView
        android:id="@+id/othergvChannel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numColumns="4"></GridView>

</LinearLayout>

3.MyGvAdapter


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

import java.util.ArrayList;

/**
 * Created by lenovo on 
 */

public class MyGvAdapter extends BaseAdapter{



    //提供一个接口
    public interface OnDeleteItemClick{
        void OnDeleteItemClick(int position);

     //   void OnDeleteItemClick(int i);
    }

    //接口实例化
    private OnDeleteItemClick listener;
    //提供初始化接口
    public void  setOnDeleteItemClick(OnDeleteItemClick listener){
        this.listener=listener;
    }

    private Context context;
    private ArrayList<String> list;

    public MyGvAdapter(Context context, ArrayList<String> list) {
        this.context = context;
        this.list = list;
    }

//boolean 
    private boolean isEdited =false;
    public void  setEdited(boolean edited){
        isEdited = edited;
        notifyDataSetChanged();
    }


    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int i) {
        return list.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(final int i, View view, ViewGroup viewGroup) {
        ViewHolder holder = null;
        if (view == null){
           holder = new ViewHolder();
           view = View.inflate(context,R.layout.item_mygv,null);
            holder.txtChannel = view.findViewById(R.id.txt_channel);
            holder.del = view.findViewById(R.id.del);
           view.setTag(holder);

        }else {
           holder = (ViewHolder) view.getTag();
        }
        holder.txtChannel.setText(list.get(i));
 //判断是否  显示和隐藏
        if (isEdited){
            holder.del.setVisibility(View.VISIBLE);
        }else {
            holder.del.setVisibility(View.GONE);
        }

        holder.del.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.OnDeleteItemClick(i);
            }
        });


        return view;
    }



    class ViewHolder{
        private TextView txtChannel;
        private ImageView del;
    }
}

Item_myGv

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">


    <TextView
        android:id="@+id/txt_channel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="22sp"
        android:text="删除"
        android:textColor="#000000"/>
    <ImageView
        android:id="@+id/del"
        android:layout_width="18dp"
        android:layout_height="18dp"
        android:src="@drawable/delete_icon_night"/>
</LinearLayout>

4.OtherGvAdapter


import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

/**
 * Created by lenovo on
 */

public class OthertAdapter extends BaseAdapter{

    private boolean isEdited = false;
    private Context context;
    private List<String> list;


    public OthertAdapter(Context context, List<String> list) {
        this.context = context;
        this.list = list;
    }

    public void  setEdited(boolean edited){
        isEdited=edited;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int i) {
        return list.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
   ViewHolder holder = null;
   if (view == null){

       holder = new ViewHolder();
       view = View.inflate(context,R.layout.item_other,null);
       holder.txtChannel = view.findViewById(R.id.txt_channel);

          view.setTag(holder);
   }else {
      holder = (ViewHolder) view.getTag();
   }
        holder.txtChannel.setText(list.get(i));

        return view;
    }

    class ViewHolder{
        private TextView txtChannel;
    }
}

Item_other

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/del"
        android:layout_width="25dp"
        android:layout_height="wrap_content"
        android:src="@drawable/detail_subscribe_night"/>

    <TextView
        android:id="@+id/txt_channel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="22sp"
        android:text="删除"
        android:textColor="#000000"/>

</LinearLayout>