activity+fragment+listview+adapter+bean在同一个类中的套路

1.xml

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
</FrameLayout>

fargment_main.xml

<?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">
  <ListView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:id="@+id/list"></ListView>
</LinearLayout>

list_item_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp" >

    <TextView
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="TEXT1"
        android:textSize="16sp" />
    <TextView
        android:id="@+id/text2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/text1"
        android:layout_below="@+id/text1"
        android:text="TEXT2"
        android:textSize="12sp" />

</RelativeLayout>

2.java

MainActivity.java

public class MainActivity extends FragmentActivity {
    MapView mMapView = null;
    private BaiduMap mBaiduMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //在使用SDK各组件之前初始化context信息，传入ApplicationContext
        //注意该方法要再setContentView方法之前实现
        setContentView(R.layout.activity_main);
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
        }

    }

    public static class PlaceholderFragment extends Fragment implements AdapterView.OnItemClickListener {
        private ListView listView;
        private MainAdapter adapter;
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View view = inflater.inflate(R.layout.fragment_main, container, false);
            listView= (ListView) view.findViewById(R.id.list);
            adapter = new MainAdapter(getContext(),R.layout.list_item_main,getDateBean());
            listView.setAdapter(adapter);
            listView.setOnItemClickListener(this);
            return view;
        }
        public static List<DataBean> getDateBean() {
            List<DataBean> list = new ArrayList<>();
            list.add(new DataBean("基本地图功能", "创建一张百度地图并管理地图的生命周期"));
            list.add(new DataBean("图层展示", "展示普通图、卫星图、交通流量图及百度城市热力图"));
            list.add(new DataBean("地图操作功能", "介绍地图基本控制方法"));
            return list;
        }

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Intent intent;
            switch (position) {
                case 0:
                    intent = new Intent(getActivity(), BaseMap.class);
                    startActivity(intent);
                    break;
                case 1:
                    intent = new Intent(getActivity(), Layers.class);
                    startActivity(intent);
                    break;
                case 2:
                    intent = new Intent(getActivity(), Location.class);
                    startActivity(intent);
                    break;
                default:
                    break;
            }
        }
    }

    public static class MainAdapter extends ArrayAdapter<DataBean> {
        private int resourceID;
        public MainAdapter(Context context, int resource, List<DataBean> objects) {
            super(context, resource, objects);
            resourceID = resource;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if (convertView == null) {
                convertView = View.inflate(getContext(), resourceID, null);
                holder = new ViewHolder();
                holder.text1 = (TextView) convertView.findViewById(R.id.text1);
                holder.text2 = (TextView) convertView.findViewById(R.id.text2);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            DataBean dataBean = getItem(position);
            holder.text1.setText(dataBean.text1);
            holder.text2.setText(dataBean.text2);
            return convertView;
        }

        class ViewHolder{
            TextView text1;
            TextView text2;
        }
    }
    public static class DataBean {
        String text1;
        String text2;

        public DataBean(String text1, String text2) {
            this.text1 = text1;
            this.text2 = text2;
        }
    }

}