从 Android 的通知中打开 MainActivity

Posted 2023-02-24

【中文标题】从 Android 的通知中打开 MainActivity

【英文标题】：Openning MainActivity from Notification in Android

【发布时间】：2020-08-09 04:14:54

【问题描述】：

我想从通知中打开我的应用 Mainactivity，但不知道在哪里声明 builder.setContentIntent() 的意图 这是我使用的代码： ReminderBroadcast.java

public class ReminderBroadcast  extends BroadcastReceiver 
    @Override
    public void onReceive(Context context, Intent intent)
        
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "notifyme")
                .setSmallIcon(R.drawable.ic_notification)
                .setContentTitle("Title for Notification")
                .setContentText("This notification is Working")
                .setPriority(NotificationCompat.PRIORITY_HIGH);
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
        notificationManager.notify(200, builder.build());
    

MainActivity.java

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        createNotificationChannel();
        
        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                Toast.makeText(MainActivity.this, "Reminder set", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(MainActivity.this, ReminderBroadcast.class);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0,intent,0);
                AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
                long timeAtClick = System.currentTimeMillis();
                long fiveSeconds = 5 * 1000;
                alarmManager.set(AlarmManager.RTC_WAKEUP,
                        timeAtClick + fiveSeconds, pendingIntent);
            
        );
    
    private void createNotificationChannel()
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O)
            CharSequence name = "ReminderChannel";
            String description = "This is used for channel";
            int importance = NotificationManager.IMPORTANCE_HIGH;
            NotificationChannel channel = new NotificationChannel("notifyme" , name , importance);
            channel.setDescription(description);
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        
    

【参考方案1】：

你必须使用PendingIntent

 Intent activityIntent = new Intent(getApplicationContext(), MainActivity.class);
 PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, activityIntent, PendingIntent.FLAG_UPDATE_CURRENT);

 NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "MyNotification")
            .setContentTitle(title)
            .setSmallIcon(R.drawable.noti)
            .setAutoCancel(true)
            .setContentIntent(pendingIntent)
            .setContentText(message);
    NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
    notificationManager.notify(200, builder.build());

【讨论】：

几乎成功了！我必须添加 context.getApplicationContext 才能让它工作。另一件事是单击时通知没有被删除。

您不需要使用context.getApplicationContext() - context 可以构建PendingIntent。如果您希望在单击通知时将其删除，听起来您正在寻找 setAutoCancel(true)。

@ianhanniballake 谢谢。有效。我想我应该更多地了解上下文