java 如何从android中的静态方法调用非静态方法
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原文地址: http://stackoverflow.com/questions/12797355/
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how to call non static method from static method in android
提问by Vishnu
I am facing a big problem in calling non static method from static method.
我在从静态方法调用非静态方法时面临一个大问题。
This is my code
这是我的代码
Class SMS
{
public static void First_function()
{
SMS sms = new SMS();
sms.Second_function();
}
public void Second_function()
{
Toast.makeText(getApplicationContext(),"Hello",1).show(); // This i anable to display and cause crash
CallingCustomBaseAdapters(); //this was the adapter class and i anable to call this also
}
I am able to call Second_function but unable to get Toast and CallCustomBaseAdapter() method, crash occurs.
我能够调用 Second_function 但无法获得 Toast 和 CallCustomBaseAdapter() 方法，发生崩溃。
What should I do to fix that issue ?
我应该怎么做才能解决这个问题？
回答by V.J.
public static void First_function(Context context)
{
SMS sms = new SMS();
sms.Second_function(context);
}
public void Second_function(Context context)
{
Toast.makeText(context,"Hello",1).show(); // This i anable to display and cause crash
}
The only solution to achieve this is that you need to pass the current context as a parameter. I wrote the code for only Toast but you need to modify it as per your requirements.
实现这一点的唯一解决方案是您需要将当前上下文作为参数传递。我只为 Toast 编写了代码，但您需要根据您的要求对其进行修改。
pass the Context from the your activity First_function(getApplicationContext())etc..
从您的活动First_function(getApplicationContext())等传递上下文。
for static string
对于静态字符串
public static String staticString = "xyz";
public static String getStaticString()
{
return staticString;
}
String xyz = getStaticString();
回答by Sebastian Breit
You should have a reference to a Context. You are trying to get the application context from inside a SMS instance.
你应该有一个对上下文的引用。您正在尝试从 SMS 实例内部获取应用程序上下文。
I guess you are calling the First_function from an Activity or Service. So you can do this:
我猜您是从活动或服务中调用 First_function。所以你可以这样做：
Class SMS
{
public static void First_function(Context context)
{
SMS sms = new SMS();
sms.Second_function(context);
}
public void Second_function(Context context)
{
Toast.makeText(context,"Hello",1).show(); // This i anable to display and cause crash
CallingCustomBaseAdapters(); //this was the adapter class and i anable to call this also
}
Then, from your activity:
然后，从您的活动：
SMS.First_function(this); //or this.getApplicationContext()
