清算意向 [英] Clearing intent

问题描述

我的 Android 应用正在被传递信息的意图调用(状态栏中的待处理意图).

My Android app is getting called by an intent that is passing information (pendingintent in statusbar).

当我点击主页按钮并通过按住主页按钮重新打开我的应用程序时，它会再次调用意图并且相同的附加功能仍然存在.

When I hit the home button and reopen my app by holding the home button it calls the intent again and the same extras are still there.

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
      super.onSaveInstanceState(savedInstanceState);
    }
    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
    }

这是不按预期运行的代码

this is the code that doesn't run like its supposed to

    String imgUrl;
    Bundle extras = this.getIntent().getExtras();


    if(extras != null){
        imgUrl = extras.getString("imgUrl");
        if( !imgUrl.equals(textView01.getText().toString()) ){

            imageView.setImageDrawable( getImageFromUrl( imgUrl ) );
            layout1.setVisibility(0);
            textView01.setText(imgUrl);//textview to hold the url

        }

    }

还有我的意图:

public void showNotification(String ticker, String title, String message, 
    String imgUrl){
    String ns = Context.NOTIFICATION_SERVICE;
    NotificationManager mNotificationManager = 
        (NotificationManager) getSystemService(ns);
    int icon = R.drawable.icon;        // icon from resources
    long when = System.currentTimeMillis();         // notification time
    CharSequence tickerText = ticker;              // ticker-text

    //make intent
    Intent notificationIntent = new Intent(this, activity.class);
    notificationIntent.putExtra("imgUrl", imgUrl);
    notificationIntent.setFlags(
        PendingIntent.FLAG_UPDATE_CURRENT | 
        PendingIntent.FLAG_ONE_SHOT);
    PendingIntent contentIntent = 
        PendingIntent.getActivity(this, 0, 
        notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT | 
        PendingIntent.FLAG_ONE_SHOT);

    //make notification
    Notification notification = new Notification(icon, tickerText, when);
    notification.setLatestEventInfo(this, title, message, contentIntent);
    //flags
    notification.flags = Notification.FLAG_SHOW_LIGHTS | 
        Notification.FLAG_ONGOING_EVENT | 
        Notification.FLAG_ONLY_ALERT_ONCE | 
        Notification.FLAG_AUTO_CANCEL;
    //sounds
    notification.defaults |= Notification.DEFAULT_SOUND;
    //notify
    mNotificationManager.notify(1, notification);
}

有什么办法可以清除intent或者检查之前是否使用过?

Is there any way to clear the intent or check whether it has been used before?

推荐答案

更新:

当我 5 年前第一次写这个答案时，我没有意识到会被这么多人提及！

UPDATE:

I didn't realise this answer would be referred to so much when I first wrote it more then 5 years ago!

我会澄清指出，根据@tato-rodrigo 的回答，在某些情况下，这不会帮助您检测已处理的意图.

I'll clarify to point out that as per @tato-rodrigo answer this won't help you detect an already handled intent in some situations.

另外我应该指出，我将清除"放在引号中是有原因的 - 你没有通过这样做真正清除意图，你只是将额外的删除用作标志活动已经看到了这个意图.

Also I should point out I put "clear" in quotes for a reason - you are not really clearing the intent by doing this, you're just using the removal of the extra as a flag that this intent has been seen by the activity already.

我遇到了完全相同的问题.

I had exactly the same issue.

以上答案让我走上正轨，我找到了更简单的解决方案，使用:

Above answer put me on the right track and I found even simpler solution, use the:

getIntent().removeExtra("key"); 

清除"意图的方法调用.

method call to "clear" the Intent.

自从一年前提出这个问题以来，回答有点晚了，但希望这能在未来帮助其他人.

Its a bit late answering since this was asked a year ago, but hopefully this helps others in the future.

这篇关于清算意向的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！