Android 频道管理(简单)

最新推荐文章于 2021-06-01 00:00:26 发布

最新推荐文章于 2021-06-01 00:00:26 发布 · 940 阅读

本文详细介绍了一种在安卓应用中实现频道管理的方法，通过使用ChannelBean类存储频道信息，并结合FragmentPagerAdapter进行Fragment的动态加载与切换。文章展示了如何在MainActivity中设置TabLayout和ViewPager，以及如何在用户操作后更新频道列表并反映到UI上。

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1 导入依赖

compile 'com.github.andyoom:draggrid:v1.0.1'

maven { url "https://jitpack.io" } ----------> （在项目的build.gradle导入）

 allprojects {
    repositories {
        google()
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

2 简单布局
在这里插入图片描述

3 在MainActivity中

public class MainActivity extends AppCompatActivity {

//定义集合用来存放频道管理和 Fragment

ArrayList<ChannelBean> channelBeanlist = new ArrayList<>();
ArrayList<Fragment> fraglist = new ArrayList<>();
private ViewPager viewPager;
private TabLayout tablayout;
private Button button;
private MyAdapter myAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    tablayout = findViewById(R.id.tablayout);
    viewPager = findViewById(R.id.viewpager);
    intData();
    
    button = findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            ChannelActivity.startChannelActivity(MainActivity.this,channelBeanlist);
        }
    });
    myAdapter = new MyAdapter(getSupportFragmentManager());
    viewPager.setAdapter(myAdapter);
    tablayout.setupWithViewPager(viewPager);

}

//
private void intData() {
channelBeanlist.add(new ChannelBean(“热点”, true));
channelBeanlist.add(new ChannelBean(“旅游”, true));
channelBeanlist.add(new ChannelBean(“条目一”, false));
channelBeanlist.add(new ChannelBean(“条目二”, false));
channelBeanlist.add(new ChannelBean(“条目三”, false));
channelBeanlist.add(new ChannelBean(“条目四”, false));

    for (int i = 0; i <channelBeanlist.size() ; i++) {
       if ( channelBeanlist.get(i).isSelect())
       {
           String name = channelBeanlist.get(i).getName();
           tablayout.addTab(tablayout.newTab().setText(name));

           if (i == 0)
           {
               fraglist.add(new Frag_02());
           }
           else if(i == 1)
           {
               fraglist.add(new Frag_01());
           }else {
               fraglist.add(new Blank());
           }
       }
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
String s = data.getStringExtra(ChannelActivity.RESULT_JSON_KEY);
Type type = new TypeToken<ArrayList>() {}.getType();

        Gson gson = new Gson();
        channelBeanlist = gson.fromJson(s, type);

        tablayout.removeAllTabs();
        fraglist.clear();

        for (int i = 0; i < channelBeanlist.size(); i++) {
               if ( channelBeanlist.get(i).isSelect())
               {
                   String name = channelBeanlist.get(i).getName();
                   tablayout.addTab(tablayout.newTab().setText(name));

                   if ("热点".equals(channelBeanlist.get(i).getName()))
                   {
                       fraglist.add(new Frag_01());

                   }else if("旅游".equals(channelBeanlist.get(i).getName()))
                   {
                       fraglist.add(new Frag_02());
                   }else
                   {
                       fraglist.add(new Blank());
                   }
               }
        }
        myAdapter.notifyDataSetChanged();
    }

class MyAdapter extends FragmentPagerAdapter{

    public MyAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int i) {
        return fraglist.get(i);
    }

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

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

//如果在fragment 中打频道管理需要在他所依赖的activity中打一下代码
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
FragmentManager manager = getSupportFragmentManager();
Fragment frag01 = manager.findFragmentByTag(“frag”);
frag01.onActivityResult(requestCode, resultCode, data);
}