延迟通知生成 (Android)

Question

我想延迟构建通知，例如1分钟，我该怎么做？我尝试插入一个处理程序并对其进行 postDelaying，但出现多个错误。

   public void customizedOnClick (View view){
        String ticker = textTicker.getText().toString();
        String title = textTitle.getText().toString();
        String body = textBody.getText().toString();


        notification.setSmallIcon(R.mipmap.ic_launcher);
        notification.setTicker(ticker);
        notification.setWhen(System.currentTimeMillis());
        notification.setContentTitle(title);
        notification.setContentText(body);

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

        //Builds notification and issues it
        NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        nm.notify(uniqueID, notification.build());


    }

Answer 1

确保导入正确的处理程序：

import android.os.Handler;

创建处理程序和可运行对象。 runnable 将是您的代码，将在延迟后执行。

private Handler handler = new Handler(); 

private NotificationCompat.Builder notification;
private static final int uniqueID = 12345;
private EditText textTicker;
private EditText textTitle;
private EditText textBody;

public void customizedOnClick (View view) {
    if(TextUtils.isEmpty(textTicker.getText() 
          || TextUtils.isEmpty(textTitle.getText())
          || TextUtils.isEmpty(textBody.getText()){
        Log.e("NotificationClick", "A TextView was empty or null");
        return;
    }

    String ticker = textTicker.getText().toString();
    String title = textTitle.getText().toString();
    String body = textBody.getText().toString();

    notification = new NotificationCompat.Builder(this)
           .setSmallIcon(R.mipmap.ic_launcher);
           .setTicker(ticker);
           .setWhen(System.currentTimeMillis());
           .setContentTitle(title);
           .setContentText(body);

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

    notification.setContentIntent(pendingIntent);

    handler.postDelayed(runnable, 20 * 1000); //twenty seconds delay
 }

 private Runnable runnable = new Runnable() { 
    @Override
    public void run() {
        NotificationManager nm =(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        nm.notify(uniqueID, notification.build());
    }
 };

Answer 2

请注意，处理程序的使用并不总是精确的，因为 "Time spent in deep sleep will add an additional delay to execution"。所以如果你想要一个精确的时间量（比如游戏能量棒）你应该选择 Handler 以外的东西。

延迟通知生成 (Android)

Delay a notification build (Android)

android

build

handler

delay

android-notifications