android 实现本地定时推送(兼容)

首先写几点感悟：

• 做兼容真的很累很费劲~
• android 8.0 广播部分不再支持动态注册，所以应该用service来实现定时推送功能
• 无论是闹钟还是通知，都得做兼容处理，android 8.0通知必须加channel_id，否则通知无法显示
• 查阅大量资料，发现代码都参差不齐，不过还是有很多值得参考的地方，目前这份代码有很多都是抄字那些博主的文章，然后稍加改动，加以整合而成
• 代码分为三个类，service类、闹钟工具类和通知工具类

首先，闹钟工具类：

package com.util;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;

import java.io.Serializable;
import java.util.Map;

/**
 * 闹钟定时工具类
 */

public class AlarmTimerUtil {

    /**
     * 设置定时闹钟
     *
     * @param context
     * @param alarmId
     * @param action
     * @param map 要传递的参数
     */
    public static void setAlarmTimer(Context context, int alarmId, long time, String action,Map<String,Serializable> map) {
        Intent myIntent = new Intent();
        myIntent.setAction(action);
        if(map != null){
            for (String key: map.keySet()) {
                myIntent.putExtra(key,map.get(key));
            }
        }

//        PendingIntent sender = PendingIntent.getBroadcast(context, alarmId, myIntent, 0);//如果是广播，就这么写
        PendingIntent sender = PendingIntent.getService(context, alarmId, myIntent, 0);

        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { //MARSHMALLOW OR ABOVE
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, time, sender);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { //LOLLIPOP 21 OR ABOVE
            AlarmManager.AlarmClockInfo alarmClockInfo = new AlarmManager.AlarmClockInfo(time, sender);
            alarmManager.setAlarmClock(alarmClockInfo, sender);
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //KITKAT 19 OR ABOVE
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, time, sender);
        } else { //FOR BELOW KITKAT ALL DEVICES
            alarmManager.set(AlarmManager.RTC_WAKEUP, time, sender);
        }
    }

    /**
     * 取消闹钟
     * @param context
     * @param action
     */
    public static void cancelAlarmTimer(Context context, String action,int alarmId) {
        Intent myIntent = new Intent();
        myIntent.setAction(action);
//        PendingIntent sender = PendingIntent.getBroadcast(context, alarmId, myIntent, 0);//如果是广播，就这么写
        PendingIntent sender = PendingIntent.getService(context, alarmId, myIntent,0);
        AlarmManager alarm = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarm.cancel(sender);
    }
}

闹钟类，目前只用过AlarmManager.RTC_WAKEUP类型，这个是精确定时，很多博客都提到过，不了解的可以自己查查。然后action用来启动服务或者广播，alarmId就是requestCode，用来区别不同的闹钟。该工具类不仅仅可以用来定时通知，只要稍加改动，定时广播、定时任务、定时弹窗都是可以做的。

通知工具类

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.os.Build;
import android.support.annotation.DrawableRes;
import android.support.v7.app.NotificationCompat;
import android.util.Log;

import com.example.MainActivity;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

class NotifyObject implements Serializable{
    public Integer type;
    public String title;
    public String subText;
    public String content;
    public String param;
    public Long firstTime;
    public Class<? extends Activity> activityClass;
    @DrawableRes public int icon;
    public List<Long> times = new ArrayList<>();

    public static byte[] toBytes(NotifyObject obj) throws  IOException{
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oos = null;
        String content = null;
        oos = new ObjectOutputStream(bout);
        oos.writeObject(obj);
        oos.close();
        byte[] bytes = bout.toByteArray();
        bout.close();
        return bytes;
    }

    public static NotifyObject from(String content) throws IOException, ClassNotFoundException {
        ByteArrayInputStream bin = new ByteArrayInputStream(content.getBytes("ISO-8859-1"));
        ObjectInputStream ois = null;
        NotifyObject obj = null;

        ois = new ObjectInputStream(bin);
        obj = (NotifyObject)ois.readObject();
        ois.close();
        bin.close();
        return obj;
    }

    public static String to(NotifyObject obj) throws  IOException{
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oos = null;
        String content = null;
        oos = new ObjectOutputStream(bout);
        oos.writeObject(obj);
        oos.close();
        byte[] bytes = bout.toByteArray();
        content = new String(bytes,"ISO-8859-1");
        bout.close();
        return content;
    }
}

/**
 * 消息通知工具
 */

public class NotificationUtil {

    private static final String TAG = "NotificationUtil";

    /**
     * 通过定时闹钟发送通知
     * @param context
     * @param notifyObjectMap
     */
    public static void  notifyByAlarm(Context context,Map<Integer,NotifyObject> notifyObjectMap){
        //将数据存储起来
        int count = 0;
        NotificationManager manager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);

        Set<Integer> keySet = notifyObjectMap.keySet();
        for (Integer key0: keySet) {
            if(!notifyObjectMap.containsKey(key0)){
                break;
            }

            NotifyObject obj = notifyObjectMap.get(key0);
            if(obj == null){
                break;
            }

            if(obj.times.size() <= 0){
                if(obj.firstTime > 0){
                    try {
                        Map<String,Serializable> map = new HashMap<>();
                        map.put("KEY_NOTIFY_ID",obj.type);
                        map.put("KEY_NOTIFY",NotifyObject.to(obj));
                        AlarmTimerUtil.setAlarmTimer(context,++count,obj.firstTime,"TIMER_ACTION",map);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }else{
                for (long time: obj.times) {
                    if(time > 0){
                        try {
                            Map<String,Serializable> map = new HashMap<>();
                            map.put("KEY_NOTIFY_ID",obj.type);
                            map.put("KEY_NOTIFY",NotifyObject.to(obj));
                            AlarmTimerUtil.setAlarmTimer(context,++count,time,"TIMER_ACTION",map);
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }

        SharedPreferences mPreferences = context.getSharedPreferences("SHARE_PREFERENCE_NOTIFICATION",Context.MODE_PRIVATE);
        SharedPreferences.Editor edit = mPreferences.edit();
        edit.putInt("KEY_MAX_ALARM_ID",count);
        edit.commit();
    }

    public static void  notifyByAlarmByReceiver(Context context,NotifyObject obj){
        if(context == null || obj== null)return;
        NotificationManager manager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
        notifyMsg(context,obj,obj.type,System.currentTimeMillis(),manager);
    }

    /**
     * 消息通知
     * @param context
     * @param obj
     */
    private static void notifyMsg(Context context,NotifyObject obj,int nid,long time,NotificationManager mNotifyMgr){
        if(context == null || obj == null)return;
        if(mNotifyMgr == null){
            mNotifyMgr =  (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
        }

        if(time <= 0)return;

        //准备intent
        Intent intent = new Intent(context,obj.activityClass);
        if(obj.param != null && obj.param.trim().length() > 0){
            intent.putExtra("param",obj.param);
        }

        //notification
        Notification notification = null;
        String contentText = obj.content;
        // 构建 PendingIntent
        PendingIntent pi = PendingIntent.getActivity(context, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        //版本兼容

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){//兼容Android8.0
            String id ="my_channel_01";
            int importance =NotificationManager.IMPORTANCE_LOW;
            CharSequence name = "notice";
            NotificationChannel mChannel =new NotificationChannel(id, name,importance);
            mChannel.enableLights(true);
            mChannel.setDescription("just show notice");
            mChannel.enableLights(true);
            mChannel.setLightColor(Color.GREEN);
            mChannel.enableVibration(true);
            mChannel.setVibrationPattern(new long[]{100,200,300,400,500,400,300,200,400});
            mNotifyMgr.createNotificationChannel(mChannel);

            Notification.Builder builder = new Notification.Builder(context,id);
            builder.setAutoCancel(true)
                    .setContentIntent(pi)
                    .setContentTitle(obj.title)
                    .setContentText(obj.content)
                    .setOngoing(false)
                    .setSmallIcon(obj.icon)
                    .setWhen(System.currentTimeMillis());
            if(obj.subText != null && obj.subText.trim().length() > 0){
                builder.setSubText(obj.subText);
            }
            notification =  builder.build();
        }else if (Build.VERSION.SDK_INT >= 23) {
            NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
            builder.setContentTitle(obj.title)
                    .setContentText(contentText)
                    .setSmallIcon(obj.icon)
                    .setContentIntent(pi)
                    .setAutoCancel(true)
                    .setOngoing(false)
                    .setWhen(System.currentTimeMillis());
            if(obj.subText != null && obj.subText.trim().length() > 0){
                builder.setSubText(obj.subText);
            }
            notification = builder.build();
        } else if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN &&
                Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP_MR1) {
            Notification.Builder builder = new Notification.Builder(context);
            builder.setAutoCancel(true)
                    .setContentIntent(pi)
                    .setContentTitle(obj.title)
                    .setContentText(obj.content)
                    .setOngoing(false)
                    .setSmallIcon(obj.icon)
                    .setWhen(System.currentTimeMillis());
            if(obj.subText != null && obj.subText.trim().length() > 0){
                builder.setSubText(obj.subText);
            }
            notification =  builder.build();
        }
        if(notification != null){
            mNotifyMgr.notify(nid, notification);
        }
    }

    /**
     * 取消所有通知 同时取消定时闹钟
     * @param context
     */
    public static void clearAllNotifyMsg(Context context){
        try{

            NotificationManager mNotifyMgr =
                    (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
            mNotifyMgr.cancelAll();

            SharedPreferences mPreferences = context.getSharedPreferences("SHARE_PREFERENCE_NOTIFICATION",Context.MODE_PRIVATE);
            int max_id = mPreferences.getInt("KEY_MAX_ALARM_ID",0);
            for (int i = 1;i <= max_id;i++){
                AlarmTimerUtil.cancelAlarmTimer(context,"TIMER_ACTION",i);
            }
            //清除数据
            mPreferences.edit().remove("KEY_MAX_ALARM_ID").commit();

        }catch (Exception e){
            Log.e(TAG,"取消通知失败",e);
        }
    }
}

• NotifyObject实现了序列化，便于传递参数，然后Activity类换成自己的Activity就行了。
• clearAllNotifyMsg用于清除所有通知，同时清除所有闹钟。
• notifyByAlarmByReceiver无论是在广播还是在服务中，都可以调用这个进行立即通知
• notifyByAlarm在activity中调用改方法，将开启定时通知
• notifyMsg这个是真正实现通知的方法，但并不需要外部调用

服务或者广播类及其配置

服务和广播配置一个就可以了，目前我才有的是服务的配置方法

服务的写法

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

import java.io.IOException;

public class AlarmService extends Service {
    public AlarmService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String str = intent.getStringExtra("KEY_NOTIFY");
        if(str == null || str.trim().length() == 0)return  super.onStartCommand(intent, flags, startId);
        try {
            NotifyObject obj = NotifyObject.from(str);
            NotificationUtil.notifyByAlarmByReceiver(this,obj);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return super.onStartCommand(intent, flags, startId);
    }
}

服务的配置方法：

 <service
    android:name=".service.AlarmService"
    android:enabled="true"
    android:exported="false">
    <intent-filter>
        <action android:name="TIMER_ACTION" />
    </intent-filter>
</service>

广播的写法

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import com.util.NotificationUtil;
import java.io.IOException;

public class AlarmReceiver  extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if("TIMER_ACTION".equals(intent.getAction())){
            String str = intent.getStringExtra("KEY_NOTIFY");
            NotifyObject obj = null;
            try {
                obj = NotifyObject.from(str);
                if(obj != null){
                    NotificationUtil.notifyByAlarmByReceiver(context,obj);//立即开启通知
                }
            } catch (IOException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
    }
}

广播的配置方法:

<receiver android:name=".service.AlarmReceiver">
    <intent-filter>
        <action android:name="TIMER_ACTION" />
    </intent-filter>
</receiver>

---

由于查看的资料太多了，所以就不一一列举了，然后提供一个测试方法，可以在MainActivity的OnCreate方法中调用：

long now = System.currentTimeMillis();
long interval[] = {0,10,60,3000,6000,12000,30000,50000,60000,100000};
int count = 1;
SimpleDateFormat smf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
for (long inter:interval) {
    Date date = new Date(now+inter);

    NotifyObject obj = new NotifyObject();
...
/**
type:count++,
title:"标题",
subText:"理论提醒时间:"+smf.format(date),
content:"类型:"+(count-1)+","+inter,
"",
firstTime:now+inter,
-1l,
null
//赋值就自己赋值啦~
**/
...
    notifyObjects.put(obj.type,obj);
}

NotificationUtil.notifyByAlarm(this,this.notifyObjects);