Android之实现简单小闹钟

小闹钟程序开发中的要点就是：

      1、时间选择对话框（TimePicker）

      2、获取闹钟管理器并对其进行设置

      3、注册广播接收器

布局文件（一次性闹钟）

MainActivity.java

package com.pxd.alarmandnotice;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TimePicker;
import java.util.Calendar;

public class MainActivity extends AppCompatActivity {
    private AlarmManager alarmManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取闹钟的管理者
        alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    }
    public  void  alarmOne(View view){
        //获取当前系统的时间
        Calendar calendar=Calendar.getInstance();
        int hour=calendar.get(Calendar.HOUR_OF_DAY);
        int minute=calendar.get(Calendar.MINUTE);
        //弹出时间对话框
        TimePickerDialog timePickerDialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                Calendar c=Calendar.getInstance();
                c.set(Calendar.HOUR_OF_DAY,hourOfDay);
                c.set(Calendar.MINUTE,minute);
                //时间一到，发送广播（闹钟响了）
                Intent intent=new Intent();
                intent.setAction("com.pxd.alarmandnotice.RING");
                //将来时态的跳转
                PendingIntent pendingIntent=PendingIntent.getBroadcast(MainActivity.this,0x101,intent,0);
              //设置闹钟
                alarmManager.set(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),pendingIntent);
       }
        },hour,minute,true);
        timePickerDialog.show();
    }
}

广播接受者： RingReceived

package com.pxd.alarmandnotice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class RingReceived extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if("com.pxd.alarmandnotice.RING".equals(intent.getAction())){
            Log.i("test","闹钟响了");
            //跳转到Activity n //广播接受者中（跳转Activity）
            Intent intent1=new Intent(context,RingActivity.class);
            //给Intent设置标志位
            intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(intent1);
        }
    }
}

要跳转的Activity, RingActivity播放音乐

package com.pxd.alarmandnotice;
import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class RingActivity extends AppCompatActivity {
    private MediaPlayer mediaPlayer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ring);
      //时间一到跳转Activity,在这个Activity中播放音乐
        mediaPlayer = MediaPlayer.create(this, R.raw.one);
        mediaPlayer.start();
    }
    public void stop(View view){
        mediaPlayer.stop();
        finish();
    }

}

响铃闹钟布局，activity_ring.xml

实现周期性闹钟只需把

 //设置闹钟
 alarmManager.set(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),pendingIntent)

改为：我这里设置的是5秒响一次

 //设置周期闹钟(5秒)
  alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),5000, pendingIntent);
       

//停止闹钟

public void cancelMany(View view){
    alarmManager.cancel(pendingIntent);
}

这样一个简单的小闹钟就可以实现了。