Broadcast组件——收发广播应用——监听系统广播——定时管理器AlarmManager

Love The Way You Lie 2023-09-28 16:27 42阅读 0赞

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布局：

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代码：

package com.example.myapplication;
    
    import android.app.AlarmManager;
    import android.app.PendingIntent;
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.os.Build;
    import android.os.Bundle;
    import android.os.Vibrator;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ArrayAdapter;
    import android.widget.CheckBox;
    import android.widget.Spinner;
    import android.widget.TextView;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener
    {
    
        private static final String TAG = "AlarmActivity";
        private CheckBox ck_repeate;
        public TextView tv_alarm;
        private int mDelay;
    
        @Override
        protected void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            ck_repeate = findViewById(R.id.ck_repeate);
            tv_alarm = findViewById(R.id.tv_alarm);
            findViewById(R.id.btn_alarm).setOnClickListener(this);
            initDelaySpinner(); // 初始化闹钟延迟的下拉框
        }
    
        // 初始化闹钟延迟的下拉框
        private void initDelaySpinner()
        {
            ArrayAdapter<String> delayAdapter = new ArrayAdapter<String>(this, R.layout.item_select, delayDescArray);
            Spinner sp_delay = findViewById(R.id.sp_delay);
            sp_delay.setPrompt("请选择闹钟延迟");
            sp_delay.setAdapter(delayAdapter);
            sp_delay.setOnItemSelectedListener(new DelaySelectedListener());
            sp_delay.setSelection(0);
        }
    
        private int[] delayArray = {5, 10, 15, 20, 25, 30};
        
        private String[] delayDescArray = {"5秒", "10秒", "15秒", "20秒", "25秒", "30秒"};
    
        class DelaySelectedListener implements AdapterView.OnItemSelectedListener
        {
            public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3)
            {
                mDelay = delayArray[arg2];
            }
    
            public void onNothingSelected(AdapterView<?> arg0) {}
        }
    
        @Override
        public void onClick(View v)
        {
            if (v.getId() == R.id.btn_alarm)
            {
                sendAlarm(); // 发送闹钟广播
                mDesc = DateUtil.getNowTime() + " 设置闹钟";
                tv_alarm.setText(mDesc);
            }
        }
    
        // 发送闹钟广播
        private void sendAlarm()
        {
            Intent intent = new Intent(ALARM_ACTION); // 创建一个广播事件的意图
    
            // 创建一个用于广播的延迟意图
            PendingIntent pIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    
            // 从系统服务中获取闹钟管理器
            AlarmManager alarmMgr = (AlarmManager) getSystemService(ALARM_SERVICE);
    
            long delayTime = System.currentTimeMillis() + mDelay*1000; // 给当前时间加上若干秒
    
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
            {
                // 允许在空闲时发送广播，Android6.0之后新增的方法
                alarmMgr.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, delayTime, pIntent);
            }
            else
            {
                // 设置一次性闹钟，延迟若干秒后，携带延迟意图发送闹钟广播(但Android6.0之后，set方法在暗屏时不保证发送广播，必须调用setAndAllowWhileIdle方法)
                alarmMgr.set(AlarmManager.RTC_WAKEUP, delayTime, pIntent);
            }
    
    //        // 设置重复闹钟，每隔一定间隔就发送闹钟广播(但从Android4.4开始，setRepeating方法不保证按时发送广播)
    //        alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
    //                mDelay*1000, pIntent);
        }
    
    
    
        // 声明一个闹钟广播事件的标识串
        private String ALARM_ACTION = "com.example.chapter09.alarm";
    
        private String mDesc = ""; // 闹钟时间到达的描述
    
        // 定义一个闹钟广播的接收器
        public class AlarmReceiver extends BroadcastReceiver
        {
            // 一旦接收到闹钟时间到达的广播，马上触发接收器的onReceive方法
            @Override
            public void onReceive(Context context, Intent intent)
            {
                if (intent != null)
                {
                    mDesc = String.format("%s\n%s 闹钟时间到达", mDesc, DateUtil.getNowTime());
                    tv_alarm.setText(mDesc);
    
                    // 从系统服务中获取震动管理器
                    Vibrator vb = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
    
                    vb.vibrate(500); // 命令震动器吱吱个若干秒
    
                    if (ck_repeate.isChecked())  // 需要重复闹钟广播
                    {
                        sendAlarm(); // 发送闹钟广播
                    }
                }
            }
        }
    
        private AlarmReceiver alarmReceiver; // 声明一个闹钟的广播接收器
    
        @Override
        public void onStart()
        {
            super.onStart();
    
            alarmReceiver = new AlarmReceiver(); // 创建一个闹钟的广播接收器
    
            // 创建一个意图过滤器，只处理指定事件来源的广播
            IntentFilter filter = new IntentFilter(ALARM_ACTION);
            registerReceiver(alarmReceiver, filter); // 注册接收器，注册之后才能正常接收广播
        }
    
        @Override
        public void onStop()
        {
            super.onStop();
    
            unregisterReceiver(alarmReceiver); // 注销接收器，注销之后就不再接收广播
        }
    
    }

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DateUtil：

package com.example.myapplication;
    
    import android.annotation.SuppressLint;
    import android.text.TextUtils;
    
    import java.text.SimpleDateFormat;
    import java.util.Calendar;
    import java.util.Date;
    
    @SuppressLint("SimpleDateFormat")
    public class DateUtil
    {
        // 获取当前的日期时间
        public static String getNowDateTime(String formatStr)
        {
            String format = formatStr;
            if (TextUtils.isEmpty(format))
            {
                format = "yyyyMMddHHmmss";
            }
    
            SimpleDateFormat sdf = new SimpleDateFormat(format);
            return sdf.format(new Date());
        }
    
        // 获取当前的时间
        public static String getNowTime()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
            return sdf.format(new Date());
        }
    
        // 获取当前的时间(精确到毫秒)
        public static String getNowTimeDetail()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.SSS");
            return sdf.format(new Date());
        }
    
        public static String getNowDate()
        {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
            return sdf.format(new Date());
        }
    
        public static String getDate(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static String getMonth(Calendar calendar)
        {
            Date date = calendar.getTime();
            // 创建一个日期格式化的工具
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
            // 将当前日期时间按照指定格式输出格式化后的日期时间字符串
            return sdf.format(date);
        }
    
        public static Date formatString(String strTime)
        {
            Date date = new Date();
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    
            try {
                date = sdf.parse(strTime);
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            return date;
        }
    
    }

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