有关 android studio notification 横幅弹出的功能没有反应

Question

小妹在这里已经卡了2-3天了，研究了很多人的文章，
除了低版本api 17有成功外，其他的不是channel null 就是没反应 (channel null已解决)

参考的文章很多，但这主要是这三篇
https://www.twle.cn/l/yufei/a...

https://www.jianshu.com/p/33e...

https://blog.csdn.net/weixin_...

拜托各位大大，帮小妹一下，以下是我的程式跟 gradle, 我在这里卡好久又没有人可问(哭)

![image](/img/bVcL0Qo)

public class MainActivity extends AppCompatActivity implements View.OnClickListener
{
    private Context mContext;
    private NotificationManager mNManager;
    private Notification notify1;
    Bitmap LargeBitmap = null;
    private static final int NOTIFYID_1 = 1;
    private NotificationCompat.Builder builder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext = MainActivity.this;
        LargeBitmap =       BitmapFactory.decodeResource(getResources(),R.drawable.app_icon_128x128);
        mNManager = (NotificationManager)   getSystemService(NOTIFICATION_SERVICE);
        Button btn_pop_no = (Button) findViewById(R.id.btn_pop_no);
        Button btn_clear_no = (Button) findViewById(R.id.btn_clear_no);
        NotificationCompat.Builder builder;
 }
    @Override
    public void onClick(View v) {
        Log.i("VERION", "onClick: "+ Build.VERSION.SDK_INT);
        switch (v.getId()) {
            case R.id.btn_pop_no:
                if(Build.VERSION.SDK_INT >=26) {
                    NotificationChannel notificationChannel = new NotificationChannel("braun","braun",NotificationManager.IMPORTANCE_DEFAULT);
                    mNManager.createNotificationChannel(notificationChannel);
                    builder = new NotificationCompat.Builder(this,"braun");
                 }
                else {
                    builder = new NotificationCompat.Builder(this);
                 }
                Intent intent = new Intent(mContext,NotifyDetailActivity.class);
                 PendingIntent pit = PendingIntent.getActivity(mContext,100,intent,PendingIntent.FLAG_UPDATE_CUR    RENT);
                 builder.setContentTitle("簡單教程").setSubText("簡單教程，簡單編程").setTicker("簡單教程上線啦....")
                        .setWhen(System.currentTimeMillis())
                        .setSmallIcon(R.drawable.app_icon_32x32)
                        .setLargeIcon(LargeBitmap)
                        .setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE)
                        .setSound(Uri.parse("android.resource://"+getPackageName() +"/"+R.raw.sms))
                        .setFullScreenIntent(pit,true)
                        .setAutoCancel(true)
                        .setContentIntent(pit);
                 notify1 = builder.build();
                mNManager.notify(NOTIFYID_1,notify1);
 break; case R.id.btn_clear_no:
                mNManager.cancel(NOTIFYID_1);
 break; }
    }
}

Answer 1

可以参考下我这个开源库
https://github.com/RedTomatoC...