移动应用开发实验四AlarmManager实现闹钟提醒_alarmanager 实现闹钟功能

• 实验内容与过程(实验题目和代码)

创建一个新的Java类，命名为"AlarmReceiver"，并将以下代码添加到该类中：

import android.content.BroadcastReceiver;
 
import android.content.Context;
 
import android.content.Intent;
 
public class AlarmReceiver extends BroadcastReceiver {
 
    @Override
 
    public void onReceive(Context context, Intent intent) {
 
        // 在这里添加你要执行的操作，比如播放音乐或者弹出通知等
 
    }
 
}

MainActivity.java类中添加以下代码：

import android.app.AlarmManager;
 
import android.app.PendingIntent;
 
import android.content.Context;
 
import android.content.Intent;
 
import android.os.Bundle;
 
import android.view.View;
 
import android.widget.Button;
 
import android.widget.TimePicker;
 
import android.widget.Toast;
 
 
 
import java.util.Calendar;
 
 
 
public class MainActivity extends AppCompatActivity {
 
 
 
    private TimePickertimePicker;
 
    private Button btnSetAlarm;
 
    private AlarmManageralarmManager;
 
    private PendingIntentpendingIntent;
 
 
 
    @Override
 
    protected void onCreate(Bundle savedInstanceState) {
 
super.onCreate(savedInstanceState);
 
setContentView(R.layout.activity_main);
 
 
 
timePicker = findViewById(R.id.timePicker);
 
btnSetAlarm = findViewById(R.id.btnSetAlarm);
 
 
 
alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
 
 
 
        Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
 
pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);
 
 
 
btnSetAlarm.setOnClickListener(new View.OnClickListener() {
 
            @Override
 
            public void onClick(View view) {
 
                Calendar calendar = Calendar.getInstance();
 
calendar.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
 
calendar.set(Calendar.MINUTE, timePicker.getCurrentMinute());
 
 
 
                long alarmTime = calendar.getTimeInMillis();
 
 
 
alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime, pendingIntent);
 
 
 
Toast.makeText(MainActivity.this, "闹钟设置成功！", Toast.LENGTH_SHORT).show();
 
            }
 
        });
 
    }
 
}

最后，在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name="android.permission.VIBRATE" />

注册AlarmReceiver类：

<receiver android:name=".AlarmReceiver" />

• 实验结果与分析（实验结果截图）