使用通知通道创建通知不起作用

Question

我一直在浏览网络寻找答案,但我自己找不到它,尽管阅读官方Android文档网站上的开发人员指南和来自互联网的代码片段.

我一直在练习在一个新的干净项目上创建通知,尽管创建了一个通知通道和通知本身,我仍然无法让它运行并收到一条消息:"无法在空通道上发布通知".但我正在创建频道,并将其分配给我的通知,就像它说到处都是.我完全没有想法,老实说我现在已经浏览堆栈至少几个小时,每个答案看起来都一样,但它根本没有帮助我,所以也许如果有人比一个初学者更好看我的代码可以告诉我我的代码有什么问题？这很烦人,因为通知是我工作的一个项目的重要组成部分,它阻止了我的追踪.

public class MainActivity extends AppCompatActivity {


NotificationCompat.Builder notification;
private static final int NOTIFICATION_ID = 1;
private static final String NOTIFICATION_CHANNEL_ID = "my_notification_channel";



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    notification = new NotificationCompat.Builder(this);
    notification.setAutoCancel(true);


    findViewById(R.id.buckysButton).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            createNotification(view);
        }
    });


}

public void createNotification(View view){
    NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "My Notifications", NotificationManager.IMPORTANCE_DEFAULT);
        notificationChannel.setDescription("Channel description");
        notificationChannel.enableLights(true);
        notificationChannel.setLightColor(Color.RED);
        notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
        notificationChannel.enableVibration(true);
        nm.createNotificationChannel(notificationChannel);
    }
        notification.setSmallIcon(R.drawable.ic_priority_high_black_24px);
        notification.setTicker("Ticker");
        notification.setWhen(System.currentTimeMillis());
        notification.setContentTitle("Title");
        notification.setContentText("Body Body Body Body Body Body Body Body Body ");
        notification.setChannel(NOTIFICATION_CHANNEL_ID);
        notification.build();

        Intent intent = new Intent(this, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        notification.setContentIntent(pendingIntent);

        nm.notify(NOTIFICATION_ID, notification.build());
    }}

顺便说一句,我正在为Android开发Android最低级别5.1,我一直想知道是否真的有必要在我的应用程序中放置频道,但我仍然这样做,因为当我试图在没有它们的情况下完成它时我仍然得到了同样的错误.

编辑:我仍然在努力解决这个问题.我是否必须在gradle文件中执行某些操作才能将两个参数传递到NotificationCompat.Builder构造函数中？不管我做什么,它都不会让我这样做,我认为这是主要的问题.

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)

不是为我做的,它仍然不想把channel_id作为参数.

Answer 1

new NotificationCompat.Builder(this);

已弃用,请尝试使用

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)

这是一个示例代码,创建一个NotificationHelper类如下,

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.provider.Settings;
import android.support.v4.app.NotificationCompat;
import android.support.v4.content.ContextCompat;

public class NotificationHelper extends ContextWrapper {
    private NotificationManager mNotificationManager;
    private final String MY_CHANNEL = "my_channel";
    private final long[] vibrationScheme = new long[]{200, 400};

    /**
     * Registers notification channels, which can be used later by individual notifications.
     *
     * @param context The application context
     */
    public NotificationHelper(Context context) {
        super(context);

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {

            // Create the channel object with the unique ID MY_CHANNEL
            NotificationChannel myChannel =
                    new NotificationChannel(
                            MY_CHANNEL,
                            getResources().getString(R.string.notification_channel_title),
                            NotificationManager.IMPORTANCE_DEFAULT);

            // Configure the channel's initial settings
            myChannel.setLightColor(Color.GREEN);
            myChannel.setVibrationPattern(vibrationScheme);

            // Submit the notification channel object to the notification manager
            getNotificationManager().createNotificationChannel(myChannel);

        }
    }

    /**
     * Build you notification with desired configurations
     *
     */
    public NotificationCompat.Builder getNotificationBuilder(String title, String body, Intent pendingIntent) {

        Bitmap notificationLargeIconBitmap = BitmapFactory.decodeResource(
                getApplicationContext().getResources(),
                R.mipmap.ic_launcher);

        return new NotificationCompat.Builder(getApplicationContext(), MY_CHANNEL)
                .setSmallIcon(R.drawable.ic_notification_icon)
                .setLargeIcon(notificationLargeIconBitmap)
                .setContentTitle(title)
                .setContentText(body)
                .setSound(Settings.System.DEFAULT_NOTIFICATION_URI)
                .setVibrate(vibrationScheme)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(body))
                .setColor(ContextCompat.getColor(getApplicationContext(), R.color.colorPrimary))
                .setContentIntent(pendingIntent)
                .setAutoCancel(true);
    }

    public NotificationManager getNotificationManager() {
        if (mNotificationManager == null) {
            mNotificationManager =
                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        }
        return mNotificationManager;
    }

}

然后按如下方式使用,

NotificationHelper notificationHelper = new NotificationHelper(context);
NotificationCompat.Builder builder = notificationHelper.getNotificationBuilder(title, message);
notificationHelper.getNotificationManager().notify(notificationID, builder.build());