示例效果

一共三个控件，EditText，Button，TextView

成功显示账号信息，查询失败显示错误信息。

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.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"

    android:background="@color/pureWhite">

    <Button

        android:id="@+id/btnQuery"

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_marginTop="64dp"

        android:text="获取账号信息"

        android:textColor="@color/pureWhite"

        android:textSize="20dp"

        android:onClick="ButtonClick"

        android:theme="@style/GenericButtonStyle"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/etAccount" />

    <EditText

        android:id="@+id/etAccount"

        android:layout_width="0dp"

        android:layout_height="wrap_content"

        android:layout_marginTop="84dp"

        android:ems="10"

        android:hint="输入账号"

        android:inputType="textPersonName"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.0"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        tools:text="Name" />

    <TextView

        android:id="@+id/tvResult"

        android:layout_width="0dp"

        android:layout_height="30dp"

        android:layout_marginTop="40dp"

        tools:text="查询结果"

        android:textSize="20sp"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/btnQuery" />

</androidx.constraintlayout.widget.ConstraintLayout>

主界面代码

控件关键信息

注意：为了简化，这里查询数据库用的是模拟操作，随机成功或者失败。

不使用任何框架的传统做法

新建用户信息类Account和回调接口

public class Account {

    private String name;

    private  int level;

public interface ResultCallback {

    void onSuccess(Account account);

    void onFailure();

}

Activity中的代码

public class HelloActivity extends AppCompatActivity {

    private TextView tvResult;

    private EditText etAccount;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.test);

        tvResult = findViewById(R.id.tvResult);

        etAccount = findViewById(R.id.etAccount);

    }

    public void ButtonClick(View view) {

        String userInput=getUserInput();

        getAccountData(userInput, new ResultCallback() {

            @Override

            public void onSuccess(Account account) {

                showSuccessPage(account);

            }

            @Override

            public void onFailure() {

                showFailurePage();

            }

        });

    }

    private String getUserInput() {

        return etAccount.getText().toString();

    }

    private void showSuccessPage(Account account) {

        tvResult.setText("用户账号："+account.getName()+"|"+

                "用户等级:"+account.getLevel());

    }

    private void showFailurePage() {

        tvResult.setText("获取数据失败");

    }

    private void getAccountData(String accountName, ResultCallback cb) {

        Random random=new Random();

        boolean isSuccess=random.nextBoolean();

        if (isSuccess) {

            Account account = new Account();

            account.setName(accountName);

            account.setLevel(100);

            cb.onSuccess(account);

        } else {

            cb.onFailure();

        }

    }

}

MVC

Account和ResultCallback同上

MVCModel代码

public class MVCModel {

    public void getAccountData(String accountName, ResultCallback cb) {

        Random random=new Random();

        boolean isSuccess=random.nextBoolean();

        if (isSuccess) {

            Account account = new Account();

            account.setName(accountName);

            account.setLevel(100);

            cb.onSuccess(account);

        } else {

            cb.onFailure();

        }

    }

}

MVCActivity代码

public class MVCActivity extends AppCompatActivity {

    private TextView tvResult;

    private EditText etAccount;

    private MVCModel model;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.test);

        tvResult = findViewById(R.id.tvResult);

        etAccount = findViewById(R.id.etAccount);

        model=new MVCModel();

    }

    public void ButtonClick(View view) {

        String userInput=getUserInput();

        model.getAccountData(userInput, new ResultCallback() {

            @Override

            public void onSuccess(Account account) {

                showSuccessPage(account);

            }

            @Override

            public void onFailure() {

                showFailurePage();

            }

        });

    }

    private String getUserInput() {

        return etAccount.getText().toString();

    }

    private void showSuccessPage(Account account) {

        tvResult.setText("用户账号："+account.getName()+"|"+

                "用户等级:"+account.getLevel());

    }

    private void showFailurePage() {

        tvResult.setText("获取数据失败");

    }

}

MVC模式缺点

Controller View不能完全解耦。

Activity过于臃肿，需要承担部分业务代码。

巴特西

Android MVC MVP MVVM (一)

示例效果

不使用任何框架的传统做法

MVC

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