如何在 Android 中显示 Toast? [英] How to display Toast in Android?

问题描述

我有一个可以拉起的滑块，然后它会显示一张地图.我可以上下移动滑块来隐藏或显示地图.当地图在前面时，我可以处理该地图上的触摸事件.每次我触摸时，都会启动一个 AsyncTask，它会下载一些数据并制作一个显示数据的 Toast.虽然我在触摸事件上开始任务，但没有显示吐司，直到我关闭滑块.当滑块关闭且地图不再显示时，Toast 出现.

I have a slider that can be pulled up and then it shows a map. I can move the slider up and down to hide or show the map. When the map is on front, I can handle touch events on that map. Everytime I touch, a AsyncTask is fired up, it downloads some data and makes a Toast that displays the data. Although I start the task on touch event no toast is displayed, not till I close the slider. When the slider is closed and the map is not displayed anymore the Toast appears.

有什么想法吗?

好的开始任务

public boolean onTouchEvent(MotionEvent event, MapView mapView){ 
    if (event.getAction() == 1) {
        new TestTask(this).execute();
        return true;            
    }else{
        return false;
    }
 }

并在 onPostExecute 中干杯

Toast.makeText(app.getBaseContext(),(String)data.result, 
                Toast.LENGTH_SHORT).show();

在新的 TestTask(this) 中，这是对 MapOverlay 的引用，而不是对 MapActivity 的引用，所以这就是问题所在.>

In new TestTask(this), this is a reference to MapOverlay and not to MapActivity, so this was the problem.

推荐答案

为了显示 Toast，试试这个:

In order to display Toast in your application, try this:

Toast.makeText(getActivity(), (String)data.result, 
   Toast.LENGTH_LONG).show();

另一个例子:

Toast.makeText(getActivity(), "This is my Toast message!",
   Toast.LENGTH_LONG).show();

我们可以为持续时间定义两个常量:

We can define two constants for duration:

int LENGTH_LONG 长时间显示视图或文本通知时间.

int LENGTH_LONG Show the view or text notification for a long period of time.

int LENGTH_SHORT 在短时间内显示视图或文本通知时间.

int LENGTH_SHORT Show the view or text notification for a short period of time.

自定义您的吐司

LayoutInflater myInflater = LayoutInflater.from(this);
View view = myInflater.inflate(R.layout.your_custom_layout, null);
Toast mytoast = new Toast(this);
mytoast.setView(view);
mytoast.setDuration(Toast.LENGTH_LONG);
mytoast.show();

这篇关于如何在 Android 中显示 Toast?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！