[英]How to call a non static variable from another class in Android?
Please understand that I have just started coding for less than a week now and I have never made an app or a program before.请理解,我刚刚开始编码不到一周,之前我从未制作过应用程序或程序。 I just look on the internet on how to do things and try to mix everything.
我只是在互联网上查看如何做事并尝试混合所有内容。 So I am making an android app, and I need to get the notification from a mysql database.
所以我正在制作一个 android 应用程序,我需要从 mysql 数据库中获取通知。 What I did is that I found a php script that converts the data in the mysql tables to a Json format so that I can read it with my app.
我所做的是找到了一个 php 脚本,可以将 mysql 表中的数据转换为 Json 格式,以便我可以用我的应用程序读取它。 Below is the part where I display the data: Mysql_display.java:
下面是我显示数据的部分:Mysql_display.java:
private void loadIntoListView(String json) throws JSONException {
JSONArray jsonArray = new JSONArray(json);
String[] licences = new String[jsonArray.length()];
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject obj = jsonArray.getJSONObject(i);
licences[i] = obj.getString("licence_number");
}
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, licences);
listView.setAdapter(arrayAdapter);
}
What I want is to display this information (licences) on the notification also: MainActivity.java我想要的是在通知上也显示此信息(许可证):MainActivity.java
public void displayNotification(){
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_alarm)
.setContentTitle("Title")
.setContentText("Licences")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
;
NotificationManagerCompat mNotifMgr = NotificationManagerCompat.from(this);
mNotifMgr.notify( 1, mBuilder.build());
}
You just can't.你就是不能。 In order to access directly a variable from another class, a variable must be declared static, otherwise the only way is creating an oject and reference it like myObject.variableName.
为了直接从另一个类访问变量,变量必须声明为静态,否则唯一的方法是创建一个对象并像 myObject.variableName 一样引用它。
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