Android 如何在用户单击'；安卓系统中的通知是什么？

我在android中向用户显示文件下载通知

现在我想在用户单击该通知时打开该文件

我已经使开放文件方法工作正常。我只是不知道如何设置click listener on notification来调用这个方法

我的通知创建者方法

public void displayFileDownloadNotification(Context context, String fileName)
    {
        new CommonMethod().createNotificationChannel(context);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID);
        builder.setSmallIcon(R.mipmap.cghs_launcher_logo);
        builder.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.cghs_launcher_logo));
        builder.setContentTitle("CGHS");
        builder.setContentText("Downloaded "+fileName);
        builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);

        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(context);
        notificationManagerCompat.notify(NOTIFICATION_ID++, builder.build());
    }

    public void createNotificationChannel(Context context)
    {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            CharSequence name = "Attachment Download Notification";
            String description = "Simple Description";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;

            NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, name, importance);
            notificationChannel.setDescription(description);

            NotificationManager notificationManager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(notificationChannel);
        }
    }

public static void openDownloadedFile(String fileName, Context context)
    {
        try{
            String path = Environment.getExternalStorageDirectory().getAbsolutePath().concat("/Download/" + fileName);
            Log.e("File Path=",path);
            File file = new File(path);
            if (file.exists()) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                Uri uri = Uri.fromFile(file);
                intent.setDataAndType(uri, "application/pdf");
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                Intent target = Intent.createChooser(intent, "Open File");
                try {
                    context.startActivity(target);
                } catch (Exception e)
                {
                    Toast.makeText(context, "No Application available to view pdf", Toast.LENGTH_LONG).show();
                }
            } else {
                Log.e("File = ", "File does not exits");
            }
        } catch (Exception e)
        {
            Log.e("Error ",e.getMessage());
            Toast.makeText(context, "No Application available to view pdf", Toast.LENGTH_LONG).show();
        }
    }

和我的文件打开方法

public void displayFileDownloadNotification(Context context, String fileName)
    {
        new CommonMethod().createNotificationChannel(context);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID);
        builder.setSmallIcon(R.mipmap.cghs_launcher_logo);
        builder.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.mipmap.cghs_launcher_logo));
        builder.setContentTitle("CGHS");
        builder.setContentText("Downloaded "+fileName);
        builder.setPriority(NotificationCompat.PRIORITY_DEFAULT);

        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(context);
        notificationManagerCompat.notify(NOTIFICATION_ID++, builder.build());
    }

    public void createNotificationChannel(Context context)
    {
        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        {
            CharSequence name = "Attachment Download Notification";
            String description = "Simple Description";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;

            NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, name, importance);
            notificationChannel.setDescription(description);

            NotificationManager notificationManager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
            notificationManager.createNotificationChannel(notificationChannel);
        }
    }

public static void openDownloadedFile(String fileName, Context context)
    {
        try{
            String path = Environment.getExternalStorageDirectory().getAbsolutePath().concat("/Download/" + fileName);
            Log.e("File Path=",path);
            File file = new File(path);
            if (file.exists()) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                Uri uri = Uri.fromFile(file);
                intent.setDataAndType(uri, "application/pdf");
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                Intent target = Intent.createChooser(intent, "Open File");
                try {
                    context.startActivity(target);
                } catch (Exception e)
                {
                    Toast.makeText(context, "No Application available to view pdf", Toast.LENGTH_LONG).show();
                }
            } else {
                Log.e("File = ", "File does not exits");
            }
        } catch (Exception e)
        {
            Log.e("Error ",e.getMessage());
            Toast.makeText(context, "No Application available to view pdf", Toast.LENGTH_LONG).show();
        }
    }

现在，当单击通知时，我如何调用这个openDownloadedFile

创建新活动 在OnCreate中调用

openDownloadedFile

编辑您的通知：

Intent Intent=新的Intent（这个，NewActivity.class）
PendingEvent PendingEvent=PendingEvent.getActivity（this，0，intent，PendingEvent.FLAG_ONE_SHOT）
builder.setContentIntent（挂起内容）

---

感谢它的工作，我只需要做一些小的调整“FLAG\u UPDATE\u CURRENT”而不是“FLAG\u ONE\u SHOT”，因为我同时有多个通知。Intent Intent=new Intent（context，OpenNotification.class）；intent.putExtra（“文件名”，文件名）；intent.setAction（Long.toString（System.currentTimeMillis（））；PendingEvent PendingEvent=PendingEvent.getActivity（上下文，0，意图，PendingEvent.FLAG_UPDATE_CURRENT）；builder.setContentIntent（挂起内容）；