第四周星期二每日总结

      本日继续完善每日打卡app，今日完善制作了打卡app的设置闹钟提醒的功能，能够在用户

登陆后选择设置指定时间打卡，时间到后系统发出提醒，页面可提供用户前往打卡和继续设置闹钟的服务。

代码如下：

activity_tip.xml    //设置闹钟页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".tip">

    <TimePicker
        android:id="@+id/time"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        tools:ignore="InvalidId" />

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

android_time.xml //闹钟到时后提醒页面

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".time">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:text="打卡时间到了"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="340dp"
        android:text="前往打卡"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

tip.java

package com.example.null001;
import androidx.appcompat.app.AppCompatActivity;
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 java.util.Calendar;

public class tip extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tip);
        final TimePicker timePicker=findViewById(R.id.time);  //获取时间拾取组件
        Button button=findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {   //给'设置闹钟'按钮设置监听
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(tip.this,time.class);
                PendingIntent pend=PendingIntent.getActivity(tip.this,0,intent,0); //显示闹钟，alarmActivity
                AlarmManager alarm= (AlarmManager) getSystemService(Context.ALARM_SERVICE);       // 通过Context.ALARM_SERVICE获取AlarmManager对象
                Calendar calendar =Calendar.getInstance();                     //获取日历对象
                calendar.set(Calendar.HOUR_OF_DAY,timePicker.getHour());       //利用时间拾取组件timePicker得到要设定的时间
                calendar.set(Calendar.MINUTE,timePicker.getMinute());
                calendar.set(Calendar.SECOND,0);
                alarm.set(AlarmManager.RTC,calendar.getTimeInMillis(),pend);     //设定闹钟

                //AlarmManager.ELAPSED_REALTIME 在指定延迟后提醒
                //AlarmManager.ELAPSED_REALTIME_WAKEUP 在指定延迟后提醒,并唤醒系统
                //AlarmManager.RTC     在指定时间提醒
                //AlarmManager.RTC_WAKEUP    在指定时间提醒并唤醒系统
            }
        });
    }
}

time.java

package com.example.null001;

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 androidx.appcompat.app.AppCompatActivity;

import java.util.Calendar;

public class time extends AppCompatActivity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_time);
        Button button=findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {   //给'设置闹钟'按钮设置监听
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(time.this,index.class);
                startActivity(intent);
                Toast.makeText(time.this,"前往打卡！",Toast.LENGTH_SHORT).show();
            }
        });
    }
}