MVP框架

HttpUtilsCallback：

public interface HttpUtilsCallback {
    void onSuccess(String success);
    void onFail(int errCode, String errMsg);
}

NetUtil：

public class NetUtil implements Callback {
    private final OkHttpClient okHttpClient;
    private HttpUtilsCallback httpUtilsCallback;

    private NetUtil() {
        okHttpClient = new OkHttpClient.Builder().build();
    }
    private static class staticClassLazy{
        private static NetUtil netUtil=new NetUtil();
    }
    public static NetUtil getInstance(){
        return staticClassLazy.netUtil;
    }

    public void doGet(String path,HttpUtilsCallback httpUtilsCallback){
        this.httpUtilsCallback = httpUtilsCallback;

        Request request = new Request.Builder()
                .url(path)
                .build();
        Call call = okHttpClient.newCall(request);
        call.enqueue(this);
    }

    public void doPost(String path, HashMap<String,String> map,HttpUtilsCallback httpUtilsCallback){
        this.httpUtilsCallback = httpUtilsCallback;

        FormBody.Builder builder = new FormBody.Builder();

        Iterator<String> iterator = map.keySet().iterator();
        while (iterator.hasNext()){
            String key = iterator.next();
            String value = map.get(key);
            builder.add(key,value);
        }

        FormBody body = builder.build();

        Request request = new Request.Builder()
                .url(path)
                .post(body)
                .build();

        Call call = okHttpClient.newCall(request);
        call.enqueue(this);
    }

    @Override
    public void onFailure(Call call, IOException e) {

    }

    @Override
    public void onResponse(Call call, Response response) throws IOException {
        String string = response.body().string();
        httpUtilsCallback.onSuccess(string);
    }
}

BasePresenter：

public class BasePresenter<T extends IBaseView> {

    private T t;

    public void attachView(T t){
        this.t=t;
    }

    public T getView(){
        return t;
    }

    public void detachView(){
        t=null;
    }
}

MainPresenter：

public class MainPresenter extends BasePresenter<IMainView>{

    private NetUtil netUtil;

    public MainPresenter() {
        netUtil = NetUtil.getInstance();
    }

    public void getDataFromServer(String path,HashMap<String, String> map) {
        netUtil.doPost(path, map, new HttpUtilsCallback() {
            @Override
            public void onSuccess(String success) {
                getView().onSuccess(success);
            }
            @Override
            public void onFail(int errCode, String errMsg) {

            }
        });
    }
}

BaseActivity：

public abstract class BaseActivity<P extends BasePresenter> extends AppCompatActivity implements IBaseView {
    private MyTitleView parent_title;
    private FrameLayout child_view;
    private P p;

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

        initParentView();

        View view = View.inflate(this, setChildContentView(), null);
        child_view.addView(view);

        initView();

        p=initPresenter();
        if (p != null) {
            p.attachView(this);
        }else {
            try {
                throw new Exception("少年 prenter 没有设置 请在您的Activity 创建 presenter");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        initData();
    }

    public MyTitleView getParent_title(){
        return parent_title;
    }

    private void initParentView() {
        parent_title = findViewById(R.id.parent_title);
        child_view = findViewById(R.id.child_view);
        parent_title.getBack().setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });
    }

    public P getPresenter() {
        return p;
    }

    abstract void initView();
    abstract void initData();
    abstract P initPresenter();
    abstract int setChildContentView();
}

MainActivity：

public class MainActivity extends BaseActivity<MainPresenter> implements IMainView{

    @Override
    void initView() {
        
    }

    @Override
    void initData() {

    }

    @Override
    MainPresenter initPresenter() {
        return new MainPresenter();
    }

    @Override
    int setChildContentView() {
        return R.layout.activity_main;
    }

    @Override
    public void onSuccess(String success) {
        
    }

    @Override
    public void onError(String error) {

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        getPresenter().detachView();
    }
}

MyTitleView：

public class MyTitleView extends RelativeLayout implements View.OnClickListener {
    private Context context;
    private TextView textView;
    private ImageView imageView;

    public MyTitleView(Context context) {
        this(context,null);
    }

    public MyTitleView(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MyTitleView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.context=context;
        initView(context);
    }

    private void initView(final Context context) {
        LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        params.addRule(RelativeLayout.CENTER_IN_PARENT);
        textView = new TextView(context);
        textView.setId(R.id.tv);
        textView.setText("标题");
        textView.setTextSize(20);
        textView.setTextColor(Color.WHITE);
        addView(textView,params);
        textView.setOnClickListener(this);

        LayoutParams params1 = new LayoutParams(100, 100);
        params1.addRule(RelativeLayout.ALIGN_LEFT);
        params1.addRule(RelativeLayout.CENTER_VERTICAL);
        params1.leftMargin=20;
        imageView = new ImageView(context);
        imageView.setId(R.id.img);
        imageView.setImageResource(R.drawable.icon_back);
        addView(imageView,params1);
    }

    public TextView getTitle(){
        return textView;
    }

    public ImageView getBack(){
        return imageView;
    }

    @Override
    public void onClick(View view) {
        switch(view.getId()){
            case R.id.tv:
                Toast.makeText(context, ""+textView.getText().toString(), Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

IBaseView：

public interface IBaseView { }

IMainView：

public interface IMainView extends IBaseView {
    void onSuccess(String success);
    void onError(String error);
}

activity_base.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".view.activity.BaseActivity">

    <com.example.test_mvp.view.customview.MyTitleView
        android:id="@+id/parent_title"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:background="@color/colorAccent"/>

    <FrameLayout
        android:id="@+id/child_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</android.support.constraint.ConstraintLayout>

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".view.activity.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>