Question

我有以下简单的类，我想用它来通知用户传入的消息（我将在应用程序进行时进化）。但就目前而言，在最后一行中，存在以下错误，我无法运行它：

无法解析方法build（）

以下是代码：

import android.app.Activity;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;

public class UserNotificationActivity extends Activity {

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

    public void triggerNoti() {
        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle("My notification")
                .setContentText("Hello World!");

        NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(001, mBuilder.build());
    }
}

我已经尝试了这个solution，但没有做出任何改变

我做错了什么？！

P.S。：目标（＆amp; min）sdk = 21

Answer 1

在支持V4及API级别19以上，通知方法有所改变。您可以尝试以下代码块。

public void sendNotification(String message, String title, Intent intent, int not_id) {
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
            PendingIntent.FLAG_ONE_SHOT);
    Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notification;
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
        notification
                = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.app_icon)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(message))
                .setContentTitle(title)
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setContentText(message)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

    } else {
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.app_icon);
        notification
                = new NotificationCompat.Builder(this)
                .setContentTitle(title)
                .setSmallIcon(R.drawable.small_icon)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(message))
                .setContentText(message)
                .setAutoCancel(true)
                //.setColor(Color.parseColor("#1a4994"))
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setLargeIcon(bitmap)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);
    }
    NotificationManager notificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    notificationManager.notify(not_id, notification.build());
}

NotificationChannel的更新：

    public void initChannels(Context context) {
    if (Build.VERSION.SDK_INT < 26) {
        return;
    }
    NotificationManager notificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    NotificationChannel channel = new NotificationChannel("default",
                                                          "Channel name",
                                                          NotificationManager.IMPORTANCE_DEFAULT);
    channel.setDescription("Channel description");
    notificationManager.createNotificationChannel(channel);
}

Answer 2

private void createNotification(){
    Intent intent = new Intent(this,NotificationReceive.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this,(int) System.currentTimeMillis(),intent,0);
    Notification notification = new Notification.Builder(this)
            .setContentTitle("Message");
        .setContentText("this is a tittle")
        .setSmallIcon(R.drawable.schollo)
        .setContentIntent(pendingIntent);
        .build();

    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notification.flags = notification.FLAG_AUTO_CANCEL;
    notificationManager.notify(0,notification);
}

NotificationCompat.Builder：无法解析方法build（）

2 个答案: