打卡APP之定闹钟

package com.example.daka;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.TimePickerDialog;
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 PointerActivity extends Activity {
    private Button btn;
    private AlarmManager alarmManager;  //闹钟管理器

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

        //获取闹钟管理器
        alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        btn = (Button)findViewById(R.id.set_clock);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                setClock(view);
            }
        });
    }

    public void setClock(View view){
        //获取当前系统时间
        Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minute = calendar.get(Calendar.MINUTE);

        //弹出闹钟框
        TimePickerDialog timePickerDialog = new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                Calendar c = Calendar.getInstance();    //获取日期对象
                c.set(Calendar.HOUR_OF_DAY, hourOfDay); //设置闹钟小时数
                c.set(Calendar.MINUTE, minute); //设置闹钟分钟数
                Intent intent = new Intent(PointerActivity.this,AlarmReceiver.class);
                //创建pendingIntent
                PendingIntent pendingIntent = PendingIntent.getBroadcast(PointerActivity.this,0X102, intent,0);
                //设置闹钟
                alarmManager.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pendingIntent);
                Toast.makeText(PointerActivity.this, "闹钟设置成功", Toast.LENGTH_SHORT).show();
            }
        },hour,minute,true);
        timePickerDialog.show();
    }
}

package com.example.daka;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;

public class AlarmActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //显示闹钟提醒框
        new AlertDialog.Builder(AlarmActivity.this)
                .setTitle("闹钟")
                .setMessage("时间到了")
                .setPositiveButton("确定", new DialogInterface.OnClickListener(){
                    public void onClick(DialogInterface dialogInterface, int which) {
                        AlarmActivity.this.finish();
                    }
                }).create().show();
    }
}

package com.example.daka;

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) {
        Intent i = new Intent(context, AlarmActivity.class);
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(i);
    }
}

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/set_clock"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="设置闹钟"/>
</LinearLayout>

原文连接：

https://www.jb51.net/article/262363.htm