getResources（）从静态方法，没有上下文 [英] getResources() from static method, without context
问题描述
我工作的一个 SQLiteOpenHelper 从中我会读通过数据库静态方法（因为数据库反正共享）。是否有可能获得应用上下文是这样的：
I'm working on a SQLiteOpenHelper from which I'll read databases via static methods (since the databases are shared anyway). Is it possible to get the application context to something like:
public static final Context context = XXX;
应该可以吧？由于我明明只有从目前的应用程序，并调用资源和数据库的应用程序内共享。
It should be possible right? Since I'm obviously only calling from the current app and both resources and databases are shared inside the app.
需要明确的是：我想要访问的资源和 SQLiteDatabases （如果我碰巧是错的有关上下文的方法）
To be clear: I want to access Resources and the SQLiteDatabases (if I happen to be wrong about the context approach).
是否有可能实现？
编辑：
是否有可能从内像这样获得上下文（没有传递给它作为一个参数）
Is it possible to get the context from inside something like this (without passing it as a parameter)
public class foo{
foo(){
XXX.getResources();
}
}
EDIT2：
试图@britzl：拳头想法
Trying @britzl:s fist idea
public class SpendoBase extends Application{
private static Context context;
public SpendoBase(){
System.out.println("SPENDOBASE: " + this);
System.out.println("SPENDOBASE: " + this.getBaseContext());
}
public static Context getContext(){
return this.context;
}
}
我如何获得上下文的持有？无论是在构造函数或形成的getContext（）;
诗的 getBaseContext（）返回null，而 getApplicationContext thows一个 NullPointerException异常。
Ps the getBaseContext() returns null, and getApplicationContext thows a nullPointerException.
推荐答案
我看到你的问题，有三种可能的解决方案：
I see three possible solutions to your problem:
-
创建自己的应用程序的子类，并设置在清单文件的应用程序类。在子类中，你可以有一个静态getInstance（）方法，将您提供从应用程序中的任何位置的应用程序上下文（从而参考资料）。例如：
Create your own subclass of Application and set that as your application class in the manifest file. In your subclass you could have a static getInstance() method that would provide you with the application context (and thus Resources) from anywhere within your application. Example:
public class BaseApplication extends Application {
private static BaseApplication instance;
public BaseApplication() {
super();
instance = this;
}
public static BaseApplication getInstance() {
return instance;
}
}
和在AndroidManifest.xml：
And in AndroidManifest.xml:
<application android:name="com.example.BaseApplication" ...>
...activities
</application>
传递一个上下文你在SQLiteOpenHelper拨打任何电话
Pass a context to any calls you make in your SQLiteOpenHelper
使用注入的资源比如依赖注入
Inject the Resources instance using dependency injection
这篇关于getResources（）从静态方法，没有上下文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！
