基于谷歌todoapp的android mvp（三）

来源：互联网发布：web项目压缩js 编辑：程序博客网时间：2024/06/06 08:50

这是我文章讲解的项目地址点击这里移步到我的项目地址
这里看一下整体的项目结构
项目结构图片
这是谷歌demo进行包的划分，请移步这里
按照一般的逻辑来讲，很少有一个activity包一个fragment，我见得大多数的情况都是主页几个tab用fragment然后用一个activity包起来
看一下homeactivty

package com.fanyafeng.todomvp.home;import android.graphics.Color;import android.os.Bundle;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.View;import android.widget.ImageView;import android.widget.TextView;import com.fanyafeng.todomvp.R;import com.fanyafeng.todomvp.BaseActivity;import com.fanyafeng.todomvp.home.main.HomeFragment;import com.fanyafeng.todomvp.home.main.HomePresenter;import com.fanyafeng.todomvp.home.personal.PersonalFragment;import com.fanyafeng.todomvp.home.recommend.RecommendFragment;//需要搭配Baseactivity，这里默认为Baseactivity,并且默认BaseActivity为包名的根目录public class HomeActivity extends BaseActivity {    private static String[] FRAGMENT_TAGS = new String[]{"1", "2", "3"};    private View[] tabs = new View[3];    private HomeFragment homeFragment;    private RecommendFragment recommendFragment;    private PersonalFragment personalFragment;    private FragmentManager fragmentManager;    private ImageView tab_img1;    private TextView tab_text1;    private ImageView tab_img2;    private TextView tab_text2;    private ImageView tab_img3;    private TextView tab_text3;    private int current = 0;    private int currentTab = -1;    @Override    protected void onCreate(Bundle savedInstanceState) {        if (savedInstanceState != null) {            current = savedInstanceState.getInt("tab");        } else {            current = 0;        }        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_home);        title = getString(R.string.title_activity_home);        fragmentManager = getSupportFragmentManager();        initView();        initData();    }    @Override    protected void onSaveInstanceState(Bundle outState) {        if (current != -1) {            outState.putInt("tab", current);        }        super.onSaveInstanceState(outState);    }    //初始化UI控件    private void initView() {        tabs[0] = findViewById(R.id.tab_one);        tab_img1 = (ImageView) findViewById(R.id.tab_img1);        tab_text1 = (TextView) findViewById(R.id.tab_text1);        tabs[1] = findViewById(R.id.tab_two);        tab_img2 = (ImageView) findViewById(R.id.tab_img2);        tab_text2 = (TextView) findViewById(R.id.tab_text2);        tabs[2] = findViewById(R.id.tab_three);        tab_img3 = (ImageView) findViewById(R.id.tab_img3);        tab_text3 = (TextView) findViewById(R.id.tab_text3);        for (int i = 0; i < tabs.length; i++) {            final int j = i;            tabs[i].setTag(i);            tabs[i].setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    selectTab(j);                }            });        }        selectTab(current);    }    private void selectTab(int tab) {        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();        switch (tab) {            case 0:                if (currentTab != 0) {                    clearTabSelection();                    hideFragement(fragmentTransaction);                    tab_text1.setTextColor(Color.parseColor("#78e0ff"));                    tab_img1.setImageResource(R.drawable.simle_logo_00);                    tab_img2.setImageResource(R.drawable.simle_logo_02);                    tab_img3.setImageResource(R.drawable.simle_logo_03);                    if (homeFragment == null) {                        homeFragment = new HomeFragment();                        new HomePresenter(this, homeFragment);                        fragmentTransaction.add(R.id.container, homeFragment, FRAGMENT_TAGS[0]);                    } else {                        fragmentTransaction.show(homeFragment);                    }                    current = 0;                    currentTab = 0;                }                break;            case 1:                if (currentTab != 1) {                    clearTabSelection();                    hideFragement(fragmentTransaction);                    tab_text2.setTextColor(Color.parseColor("#78e0ff"));                    tab_img1.setImageResource(R.drawable.simle_logo_01);                    tab_img2.setImageResource(R.drawable.simle_logo_00);                    tab_img3.setImageResource(R.drawable.simle_logo_03);                    if (recommendFragment == null) {                        recommendFragment = new RecommendFragment();                        fragmentTransaction.add(R.id.container, recommendFragment, FRAGMENT_TAGS[1]);                    } else {                        fragmentTransaction.show(recommendFragment);                    }                    current = 1;                    currentTab = 1;                }                break;            case 2:                if (currentTab != 2) {                    clearTabSelection();                    hideFragement(fragmentTransaction);                    tab_text3.setTextColor(Color.parseColor("#78e0ff"));                    tab_img1.setImageResource(R.drawable.simle_logo_01);                    tab_img2.setImageResource(R.drawable.simle_logo_02);                    tab_img3.setImageResource(R.drawable.simle_logo_00);                    if (personalFragment == null) {                        personalFragment = new PersonalFragment();                        fragmentTransaction.add(R.id.container, personalFragment, FRAGMENT_TAGS[2]);                    } else {                        fragmentTransaction.show(personalFragment);                    }                    current = 2;                    currentTab = 2;                }                break;        }        fragmentTransaction.commit();    }    //初始化数据    private void initData() {    }    /**     * 设置为默认颜色     */    private void clearTabSelection() {        tab_text1.setTextColor(Color.RED);        tab_text2.setTextColor(Color.RED);        tab_text3.setTextColor(Color.RED);    }    private void hideFragement(FragmentTransaction fragmentTransaction) {        if (homeFragment != null) {            fragmentTransaction.hide(homeFragment);        }        if (recommendFragment != null) {            fragmentTransaction.hide(recommendFragment);        }        if (personalFragment != null) {            fragmentTransaction.hide(personalFragment);        }    }}

我这里就拿home举了个例子，其他的没有写，在新建fragment的时候对p进行了初始化

if (homeFragment == null) {                        homeFragment = new HomeFragment();                        new HomePresenter(this, homeFragment);                        fragmentTransaction.add(R.id.container, homeFragment, FRAGMENT_TAGS[0]);                    } else {                        fragmentTransaction.show(homeFragment);                    }

再来看一下contract，就是理清楚项目的大体结构的关键，当然这里仅仅针对的是home这一个fragment

package com.fanyafeng.todomvp.home.main;import com.fanyafeng.todomvp.BasePresenter;import com.fanyafeng.todomvp.BaseView;/** * Author： fanyafeng * Data： 16/12/6 12:12 * Email: fanyafeng@live.cn */public interface HomeContract {    interface View extends BaseView<Presenter> {        void changeHomeDesc(String desc);    }    interface Presenter extends BasePresenter {    }}

这里的view继承了baseview，presenter继承了basepresenter再来看一下p

package com.fanyafeng.todomvp.home.main;import android.content.Context;/** * Author： fanyafeng * Data： 16/12/6 12:13 * Email: fanyafeng@live.cn */public class HomePresenter implements HomeContract.Presenter {    private Context context;    private HomeContract.View homeView;    public HomePresenter(Context context, HomeContract.View homeView) {        this.context = context;        this.homeView = homeView;        homeView.setPresenter(this);    }    @Override    public void start() {        homeView.changeHomeDesc("P中更改首页描述");    }}

这里是进行ui的操作，还有就是在构造方法中给view进行set了p，这一点不要忘记
最后看一下v也就是fragment

package com.fanyafeng.todomvp.home.main;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.TextView;import com.fanyafeng.todomvp.R;public class HomeFragment extends Fragment implements HomeContract.View {    private static final String ARG_PARAM1 = "param1";    private static final String ARG_PARAM2 = "param2";    private String mParam1;    private String mParam2;    private TextView tvHomeDesc;    private HomeContract.Presenter mPresenter;    public HomeFragment() {    }    public static HomeFragment newInstance(String param1, String param2) {        HomeFragment fragment = new HomeFragment();        Bundle args = new Bundle();        args.putString(ARG_PARAM1, param1);        args.putString(ARG_PARAM2, param2);        fragment.setArguments(args);        return fragment;    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        if (getArguments() != null) {            mParam1 = getArguments().getString(ARG_PARAM1);            mParam2 = getArguments().getString(ARG_PARAM2);        }    }    @Override    public void onResume() {        super.onResume();        mPresenter.start();    }    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_home, container, false);    }    @Override    public void onActivityCreated(@Nullable Bundle savedInstanceState) {        super.onActivityCreated(savedInstanceState);        initView();        initData();    }    private void initView() {        tvHomeDesc = (TextView) getActivity().findViewById(R.id.tvHomeDesc);    }    private void initData() {    }    @Override    public void changeHomeDesc(String desc) {        tvHomeDesc.setText(desc);    }    @Override    public void setPresenter(HomeContract.Presenter presenter) {        mPresenter = presenter;    }}

这里是在fragment方法中进行的p的start，简单来讲就是在view实例化完成以后就可以进行star中的操作了，这里仅仅是更新的ui，在上面的文章中有数据请求等等，可以看一下上文
我感觉基本要说的重点都说完了，但是仅仅看我感觉用处不大，还是自己亲身写一下体验一下比较好，这是我文章讲解的项目地址
点击这里移步到我的项目地址

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