频道二

最新推荐文章于 2024-09-27 22:15:39 发布

原创最新推荐文章于 2024-09-27 22:15:39 发布 · 104 阅读

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本文介绍了一个基于Android的项目，使用TabLayout组件动态管理多个Fragment。通过ChannelBean类来存储频道信息，并实现了根据频道的选择状态动态更新TabLayout的功能。此外，还包含了频道管理的回调处理，能够刷新TabLayout显示最新的频道选择。

package com.example.pdmannager_day15;

import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
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.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import com.andy.library.ChannelActivity;
import com.andy.library.ChannelBean;
import com.example.pdmannager_day15.fragment.AFragment;
import com.example.pdmannager_day15.fragment.BFragment;
import com.example.pdmannager_day15.fragment.CFragment;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

private TabLayout Tab_Layout;
private TextView Image_Btn;
private ArrayList<ChannelBean> channelBeens;
String jsonStr = "";
private Gson gson;
private Button test_btn;
private ArrayList<Fragment> mList = new ArrayList<>();
private ViewPager mPager;

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


private void initView() {
    Tab_Layout = (TabLayout) findViewById(R.id.Tab_Layout);
    Image_Btn = findViewById(R.id.Add_Fragment);
    mPager = findViewById(R.id.View_Pager);
    Image_Btn.setOnClickListener(this);
}

private void initData() {
    //准备栏目数据
    channelBeens = new ArrayList<ChannelBean>();
    channelBeens.add(new ChannelBean("热点", true));
    channelBeens.add(new ChannelBean("条目3", true));
    channelBeens.add(new ChannelBean("条目4", false));
    channelBeens.add(new ChannelBean("条目5", false));

    mList.add(new AFragment());
    mList.add(new BFragment());
    mList.add(new CFragment());
    mList.add(new AFragment());

    //把选择的栏目（true）数据配置给tablayout
    for (int i = 0; i < channelBeens.size(); i++) {
        if (channelBeens.get(i).isSelect()) {
            Tab_Layout.addTab(Tab_Layout.newTab().setText(channelBeens.get(i).getName()));
        }
    }

    mPager.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
        @Override
        public Fragment getItem(int i) {
            if (channelBeens.get(i).getName().equals("热点")) {
                return mList.get(0);
            } else if (channelBeens.get(i).getName().equals("条目3")) {
                return mList.get(1);
            } else if (channelBeens.get(i).getName().equals("条目4")) {
                return mList.get(2);
            } else {
                return mList.get(3);
            }
        }

        @Override
        public int getCount() {
            int count = 0;
            for (int i = 0; i < channelBeens.size(); i++) {
                if (channelBeens.get(i).isSelect()) {
                    count++;
                }
            }

            return count;
        }

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

    Tab_Layout.setupWithViewPager(mPager);
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.Add_Fragment:
            ChannelActivity.startChannelActivity(MainActivity.this, channelBeens);
            break;
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == ChannelActivity.REQUEST_CODE && resultCode == ChannelActivity.RESULT_CODE) {//为true表示是频道管理回调回来的
        jsonStr = data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);//得到栏目管理的结果
        Toast.makeText(this, jsonStr, Toast.LENGTH_SHORT).show();
        Log.i("main", jsonStr);
        Tab_Layout.removeAllTabs();//清空之前的栏目
        //把新选择的栏目结果更新到tablayout上
        gson = new Gson();
        //进行json解析
        Type type = new TypeToken<ArrayList<ChannelBean>>() {
        }.getType();
        channelBeens = gson.fromJson(jsonStr, type);

        //遍历结果，更新tablayout
        for (int i = 0; i < channelBeens.size(); i++) {
            if (channelBeens.get(i).isSelect()) {
                try {
                    Tab_Layout.addTab(Tab_Layout.newTab().setText(channelBeens.get(i).getName()));
                } catch (Exception e) {

                }

            }
        }
        mPager.getAdapter().notifyDataSetChanged();
    }

}

}