我想从我的简单Java类“ MyContent”中读取,并且有一个没有参数的静态方法,因为一旦您在内部调用变量,它将在该静态方法中执行代码。我正在尝试通过读取Assets文件夹中的文件并放入列表来向其中添加代码,以便数据适配器读取它。
MyContent类:
public class MyContent extends Application {
public static final List<Element> ITEMS = new ArrayList<Element>();
private static Random random = new Random(System.currentTimeMillis());
public static final Map<String, Element> ITEM_MAP = new HashMap<String, Element>();
AssetManager assetManager = getAssets();
static {
try {
InputStream inputStream = getAssets().open("data.csv");
InputStreamReader inputStreamReader=new InputStreamReader((inputStream));
BufferedReader bufferedReader=new BufferedReader((inputStreamReader));
String tt="";
while ((tt=bufferedReader.readLine())!=null){
MyContent.addItemElement(MyContent.createElement(tt));
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
问题是AssetManager assetManager = getAssets();不能是静态的,但是InputStream inputStream = getAssets()。open(“ data.csv”);我需要将它们放入静态方法中,任何人都可以告诉我如何处理此问题吗?
[getAssets()
需要先初始化应用程序context
,然后才能进行调用]。下面的代码流应该可以实现您的目标:
public class MyContent extends Application {
public static final Map<String, Element> ITEM_MAP;
@Override
public void onCreate() {
super.onCreate();
ITEM_MAP = new HashMap<String, Element>();
AssetManager assetManager = getAssets();
try {
InputStream inputStream = getAssets().open("data.csv");
InputStreamReader inputStreamReader=new InputStreamReader((inputStream));
BufferedReader bufferedReader=new BufferedReader((inputStreamReader));
String tt="";
while ((tt=bufferedReader.readLine())!=null){
MyContent.addItemElement(MyContent.createElement(tt));
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
[在AndroidManifest.xml
内部,请记住将您的应用类添加到标签application
下,例如
<application
android:name=". MyContent"
...
</application>