用Android studio写出简易课程表应用程序，用户可以添加、修改、删除课程，并且可以设置每个课程的具体时间及地点，方便学生掌握自己的日程安排的代码

很高兴为您提供帮助，以下是一个简单的课程表应用程序的示例代码，您可以在 Android Studio 中运行它。请注意，这只是一个示例代码，您可以根据自己的需求进行修改和扩展。

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private ArrayList<String> courses;
    private ArrayAdapter<String> adapter;

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

        listView = findViewById(R.id.listView);
        courses = new ArrayList<>();
        adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, courses);
        listView.setAdapter(adapter);

        // Add course button
        findViewById(R.id.addButton).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, AddCourseActivity.class);
                startActivity(intent);
            }
        });

        // Modify or delete course
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String course = courses.get(position);
                Intent intent = new Intent(MainActivity.this, ModifyCourseActivity.class);
                intent.putExtra("course", course);
                intent.putExtra("position", position);
                startActivity(intent);
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        courses.clear();
        courses.addAll(CourseManager.getInstance().getCourses());
        adapter.notifyDataSetChanged();
    }
}

AddCourseActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AddCourseActivity extends AppCompatActivity {

    private EditText nameEditText, timeEditText, locationEditText;

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

        nameEditText = findViewById(R.id.nameEditText);
        timeEditText = findViewById(R.id.timeEditText);
        locationEditText = findViewById(R.id.locationEditText);

        Button addButton = findViewById(R.id.addButton);
        addButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = nameEditText.getText().toString();
                String time = timeEditText.getText().toString();
                String location = locationEditText.getText().toString();

                if (name.isEmpty() || time.isEmpty() || location.isEmpty()) {
                    Toast.makeText(AddCourseActivity.this, "Please fill all fields", Toast.LENGTH_SHORT).show();
                    return;
                }

                CourseManager.getInstance().addCourse(new Course(name, time, location));
                finish();
            }
        });
    }
}

ModifyCourseActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class ModifyCourseActivity extends AppCompatActivity {

    private EditText nameEditText, timeEditText, locationEditText;
    private int position;

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

        nameEditText = findViewById(R.id.nameEditText);
        timeEditText = findViewById(R.id.timeEditText);
        locationEditText = findViewById(R.id.locationEditText);

        String course = getIntent().getStringExtra("course");
        position = getIntent().getIntExtra("position", 0);
        String[] parts = course.split("\n");
        nameEditText.setText(parts[0]);
        timeEditText.setText(parts[1]);
        locationEditText.setText(parts[2]);

        Button modifyButton = findViewById(R.id.modifyButton);
        modifyButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = nameEditText.getText().toString();
                String time = timeEditText.getText().toString();
                String location = locationEditText.getText().toString();

                if (name.isEmpty() || time.isEmpty() || location.isEmpty()) {
                    Toast.makeText(ModifyCourseActivity.this, "Please fill all fields", Toast.LENGTH_SHORT).show();
                    return;
                }

                CourseManager.getInstance().modifyCourse(position, new Course(name, time, location));
                finish();
            }
        });

        Button deleteButton = findViewById(R.id.deleteButton);
        deleteButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CourseManager.getInstance().deleteCourse(position);
                finish();
            }
        });
    }
}

Course.java

public class Course {
    private String name;
    private String time;
    private String location;

    public Course(String name, String time, String location) {
        this.name = name;
        this.time = time;
        this.location = location;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

    @Override
    public String toString() {
        return name + "\n" + time + "\n" + location;
    }
}

CourseManager.java

import java.util.ArrayList;

public class CourseManager {
    private static CourseManager instance;
    private ArrayList<Course> courses;

    private CourseManager() {
        courses = new ArrayList<>();
    }

    public static CourseManager getInstance() {
        if (instance == null) {
            instance = new CourseManager();
        }
        return instance;
    }

    public void addCourse(Course course) {
        courses.add(course);
    }

    public void modifyCourse(int position, Course course) {
        courses.set(position, course);
    }

    public void deleteCourse(int position) {
        courses.remove(position);
    }

    public ArrayList<String> getCourses() {
        ArrayList<String> courseStrings = new ArrayList<>();
        for (Course course : courses) {
            courseStrings.add(course.toString());
        }
        return courseStrings;
    }
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/addButton" />

    <Button
        android:id="@+id/addButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add Course"
        android:layout_alignParentBottom="true"/>

</RelativeLayout>

activity_add_course.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/nameEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Course Name" />

    <EditText
        android:id="@+id/timeEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Course Time" />

    <EditText
        android:id="@+id/locationEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Course Location" />

    <Button
        android:id="@+id/addButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Add" />

</LinearLayout>

activity_modify_course.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/nameEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Course Name" />

    <EditText
        android:id="@+id/timeEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Course Time" />

    <EditText
        android:id="@+id/locationEditText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Course Location" />

    <Button
        android:id="@+id/modifyButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Modify" />

    <Button
        android:id="@+id/deleteButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Delete" />

</LinearLayout>