兼容 android 8.0 通知

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v4.app.NotificationCompat;

import com.douziit.locator.R;
import com.douziit.locator.activity.personalcenter.AlarmPushActivity;

import java.util.Date;

/**
 * 兼容 android 8.0  通知
 */

public class NotificationUtils extends ContextWrapper {

    private NotificationManager manager;
    public static final String id = "channel_MiWa_Id";
    public static final String name = "channel_MiWa_Name";
    private PendingIntent pendingIntent;

    public NotificationUtils(Context context){
        super(context);
        //点击通知响应事件
        pendingIntent = PendingIntent.getActivity(getApplicationContext(), 100, new Intent(getApplicationContext(), AlarmPushActivity.class),
        PendingIntent.FLAG_CANCEL_CURRENT);
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    public void createNotificationChannel(){
        NotificationChannel channel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_HIGH);
        getManager().createNotificationChannel(channel);
    }
    private NotificationManager getManager(){
        if (manager == null){
            manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        }
        return manager;
    }
    @RequiresApi(api = Build.VERSION_CODES.O)
    public Notification.Builder getChannelNotification(String title, String content){
        return new Notification.Builder(getApplicationContext(), id)
                .setTicker("您有新的警报信息，请注意查看")
                .setContentTitle(title)
                .setContentText(Utils.GetMMddHHmmss(new Date()))
                .setSubText(content)
                .setSmallIcon(R.mipmap.icon)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.icon))
                .setAutoCancel(true)
                .setWhen(System.currentTimeMillis())
                .setVisibility(Notification.VISIBILITY_PUBLIC)
                .setContentIntent(pendingIntent);
    }
    public NotificationCompat.Builder getNotification_25(String title, String content){
        return new NotificationCompat.Builder(getApplicationContext())
                .setTicker("您有新的警报信息，请注意查看")
                .setContentTitle(title)
                .setContentText(Utils.GetMMddHHmmss(new Date()))
                .setSubText(content)
                .setSmallIcon(R.mipmap.icon)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.icon))
                .setAutoCancel(true)
                .setWhen(System.currentTimeMillis())
                .setVisibility(Notification.VISIBILITY_PUBLIC)
                .setContentIntent(pendingIntent);
    }

    public void sendNotification(int id, String title, String content){
        if (Build.VERSION.SDK_INT>=26){
            createNotificationChannel();
            Notification notification = getChannelNotification(title, content).build();
            getManager().notify(id,notification);
        }else{
            Notification notification = getNotification_25(title, content).build();
            getManager().notify(id,notification);
        }
    }
}