Android MVP+Adapter+ViewHolder抽取-ListView最终优化

简单的MVP设计

1. 首先我配置了MyApplication为了方便调用Context
记住需要在清单中配置name节点 android:name=".application.MyApplication"

public class MyApplication extends Application {
    public static Context MainContext;

    @Override
    public void onCreate() {
        super.onCreate();
        MainContext = getApplicationContext();
    }
}

2.创建Activity 继承FragmentActivity 并且模拟数据

package com.oblivion.mvp_fragment;

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.os.Bundle;

import com.oblivion.mvp_fragment.fragment.FirstFragment;

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

public class MainActivity extends FragmentActivity {

    private List<Integer> mList;

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

    }

    /**
     * 模拟数据
     */
    private void initData() {
        mList = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            mList.add(i);
        }
    }

    /**
     * 初始化Fragment
     */
    private void initFragment() {
        FragmentManager manager = getSupportFragmentManager();
        FragmentTransaction transaction = manager.beginTransaction();
        transaction.add(R.id.fl_main, FirstFragment.newInstance(mList));
        transaction.commit();
    }
}

3.Adapter 的基类

package com.oblivion.mvp_fragment.adapter;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import com.oblivion.mvp_fragment.holder.BasicHolder;
import com.oblivion.mvp_fragment.holder.ViewHolder;

import java.util.List;

/**
 * Created by oblivion on 2016/11/18.
 */
public abstract class BasicAdapter<T> extends BaseAdapter {
    private List<T> mList;

    public BasicAdapter(List<T> mList) {
        this.mList = mList;
    }

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

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        BasicHolder holder;
        if (convertView == null) {
            holder = initHolder();
            convertView = holder.holderView;
            convertView.setTag(holder);
        } else {
            holder = (BasicHolder) convertView.getTag();
        }
        holder.bindData(position);
        return convertView;
    }

    public abstract BasicHolder initHolder();
}

4.Adapter的基类继承

package com.oblivion.mvp_fragment.adapter;

import android.app.Activity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.TextView;

import com.oblivion.mvp_fragment.R;
import com.oblivion.mvp_fragment.holder.BasicHolder;
import com.oblivion.mvp_fragment.holder.ViewHolder;

import java.util.List;

/**
 * Created by oblivion on 2016/11/18.
 */
public class FirstFragmentAdapter extends BasicAdapter {
    protected List<Integer> mLists;

    public FirstFragmentAdapter(List<Integer> mLists) {
        super(mLists);
        this.mLists = mLists;
    }

    @Override
    public BasicHolder initHolder() {
        return new ViewHolder(mLists);
    }
}

5.Holder的基类

package com.oblivion.mvp_fragment.holder;

import android.view.View;
import android.widget.TextView;

import com.oblivion.mvp_fragment.R;
import com.oblivion.mvp_fragment.application.MyApplication;

import java.util.List;

/**
 * Created by oblivion on 2016/11/18.
 */
public abstract class BasicHolder<T> {
    public View holderView;
    public List<T> mLists;

    public BasicHolder(List<T> mLists) {
        this.mLists = mLists;
        holderView = getInflateView();
    }

    public abstract View getInflateView();

    public abstract void bindData(int position);

}

6.Holder基类的实现 ViewHolder

package com.oblivion.mvp_fragment.holder;

import android.view.View;
import android.widget.TextView;

import com.oblivion.mvp_fragment.R;
import com.oblivion.mvp_fragment.application.MyApplication;

import java.util.List;

/**
 * Created by oblivion on 2016/11/18.
 */
public class ViewHolder extends BasicHolder<Integer> {

    public TextView tv;

    public ViewHolder(List<Integer> mLists) {
        super(mLists);
    }

    @Override
    public View getInflateView() {
        View view = View.inflate(MyApplication.MainContext, R.layout.item_firstfragment, null);
        tv = (TextView) view.findViewById(R.id.tv_item);
        return view;
    }

    @Override
    public void bindData(int position) {
        tv.setText(mLists.get(position) + "");
    }
}

7.FirstFragment

package com.oblivion.mvp_fragment.fragment;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import com.oblivion.mvp_fragment.R;
import com.oblivion.mvp_fragment.adapter.FirstFragmentAdapter;
import com.oblivion.mvp_fragment.presenter.Presenter;
import com.oblivion.mvp_fragment.view.IShowView;

import java.util.List;

/**
 * Created by oblivion on 2016/11/18.
 */
public class FirstFragment extends Fragment implements IShowView {
    private static List<Integer> mLists;
    private Presenter presenter;
    private ListView listView;

    public static Fragment newInstance(List<Integer> mList) {
        mLists = mList;
        return new FirstFragment();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_first, null);
        listView = (ListView) view.findViewById(R.id.lv_first);
        presenter = new Presenter(this);
        presenter.doLogic();
        return view;
    }

    @Override
    public void showNext() {

    }

    @Override
    public void showSuccess(int data) {
        //数据加载成功的话
        mLists.add(data);
        listView.setAdapter(new FirstFragmentAdapter(mLists));
    }

    @Override
    public void showError() {

    }
}

8.网络连接接口Model

package com.oblivion.mvp_fragment.model;

/**
 * Created by oblivion on 2016/11/18.
 */
public interface IModelGetData {
    String getData();

}

9.Model的接口实现

package com.oblivion.mvp_fragment.model.impl;

import android.os.SystemClock;

import com.oblivion.mvp_fragment.model.IModelGetData;

/**
 * Created by oblivion on 2016/11/18.
 */
public class IModelGetDataImpl implements IModelGetData {
    @Override
    public String getData() {
        SystemClock.sleep(2000);
        return "撩妹中,勿打扰...";
    }
}

10.View的接口

package com.oblivion.mvp_fragment.view;

/**
 * 控制视图
 * Created by oblivion on 2016/11/18.
 */
public interface IShowView {

    void showNext();

    void showSuccess(int data);

    void showError();
}

11.逻辑实现presenter

package com.oblivion.mvp_fragment.presenter;

import com.oblivion.mvp_fragment.model.IModelGetData;
import com.oblivion.mvp_fragment.model.impl.IModelGetDataImpl;
import com.oblivion.mvp_fragment.view.IShowView;

/**
 * Created by oblivion on 2016/11/18.
 */
public class Presenter {
    private IModelGetData modelGetData;
    private IShowView showView;

    public Presenter(IShowView showView) {
        this.showView = showView;
        modelGetData = new IModelGetDataImpl();
    }

    public void doLogic() {
        String data = modelGetData.getData();
        if (data != null && data.length() > 0) {
            showView.showSuccess(1000);
        }
    }
}