android实现一个简单的音乐播放，闹钟，日程提醒的代码和布局文件

以下是一个简单的Android音乐播放器、闹钟、日程提醒的代码和布局文件，您可以参考：

布局文件 music_player_layout.xml：

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

    <!-- 音乐播放器 -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="音乐播放器"/>

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

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

    <!-- 闹钟 -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="闹钟"/>

    <TimePicker
        android:id="@+id/time_picker"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/btn_set_alarm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="设定闹钟"/>

    <!-- 日程提醒 -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="日程提醒"/>

    <EditText
        android:id="@+id/et_event"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入事件"/>

    <DatePicker
        android:id="@+id/date_picker"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <TimePicker
        android:id="@+id/time_picker_event"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <Button
        android:id="@+id/btn_set_event"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="设定日程提醒"/>

</LinearLayout>

Java代码 MusicPlayerActivity.java：

public class MusicPlayerActivity extends AppCompatActivity implements View.OnClickListener {

    private MediaPlayer mediaPlayer;

    private Button btnPlay, btnPause;

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

        btnPlay = findViewById(R.id.btn_play);
        btnPause = findViewById(R.id.btn_pause);

        btnPlay.setOnClickListener(this);
        btnPause.setOnClickListener(this);

        mediaPlayer = MediaPlayer.create(this, R.raw.music);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_play:
                if (!mediaPlayer.isPlaying()) {
                    mediaPlayer.start();
                }
                break;
            case R.id.btn_pause:
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();
                }
                break;
            default:
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (mediaPlayer != null) {
            mediaPlayer.stop();
            mediaPlayer.release();
        }
    }
}

Java代码 AlarmActivity.java：

public class AlarmActivity extends AppCompatActivity implements View.OnClickListener {

    private TimePicker timePicker;
    private Button btnSetAlarm;

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

        timePicker = findViewById(R.id.time_picker);
        btnSetAlarm = findViewById(R.id.btn_set_alarm);

        btnSetAlarm.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_set_alarm:
                Intent intent = new Intent(this, AlarmReceiver.class);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

                Calendar calendar = Calendar.getInstance();
                calendar.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
                calendar.set(Calendar.MINUTE, timePicker.getCurrentMinute());
                calendar.set(Calendar.SECOND, 0);
                calendar.set(Calendar.MILLISECOND, 0);

                AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
                alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

                Toast.makeText(this, "闹钟已设定", Toast.LENGTH_SHORT).show();
                break;
            default:
                break;
        }
    }
}

Java代码 AlarmReceiver.java：

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "闹钟响了", Toast.LENGTH_LONG).show();
    }
}

Java代码 EventActivity.java：

public class EventActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText etEvent;
    private DatePicker datePicker;
    private TimePicker timePicker;
    private Button btnSetEvent;

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

        etEvent = findViewById(R.id.et_event);
        datePicker = findViewById(R.id.date_picker);
        timePicker = findViewById(R.id.time_picker_event);
        btnSetEvent = findViewById(R.id.btn_set_event);

        btnSetEvent.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.btn_set_event:
                String event = etEvent.getText().toString();
                int year = datePicker.getYear();
                int month = datePicker.getMonth();
                int dayOfMonth = datePicker.getDayOfMonth();
                int hourOfDay = timePicker.getCurrentHour();
                int minute = timePicker.getCurrentMinute();

                Calendar calendar = Calendar.getInstance();
                calendar.set(Calendar.YEAR, year);
                calendar.set(Calendar.MONTH, month);
                calendar.set(Calendar.DAY_OF_MONTH, dayOfMonth);
                calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
                calendar.set(Calendar.MINUTE, minute);
                calendar.set(Calendar.SECOND, 0);
                calendar.set(Calendar.MILLISECOND, 0);

                Intent intent = new Intent(this, EventReceiver.class);
                intent.putExtra("event", event);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

                AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
                alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

                Toast.makeText(this, "日程提醒已设定", Toast.LENGTH_SHORT).show();
                break;
            default:
                break;
        }
    }
}

Java代码 EventReceiver.java：

public class EventReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String event = intent.getStringExtra("event");
        Toast.makeText(context, "事件提醒：" + event, Toast.LENGTH_LONG).show();
    }
}

以上就是一个简单的Android音乐播放器、闹钟、日程提醒的代码和布局文件，希望能对您有所帮助。