getResources 不起作用/未定义的 Java
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getResources does not work / undefined Java
提问by Udo
I have a problem with caling the getResources()function in an standard class. All imports must be there to use the function. Is there any special class I need to extend my class?
我getResources()在标准类中调用函数时遇到问题。所有导入都必须在那里才能使用该功能。我需要扩展我的课程有什么特殊的课程吗？
Thanks for the immediate help.
感谢您的即时帮助。
package com.example.helloandroid;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.res.Resources;
import android.content.Intent;
import android.os.Bundle;
//import android.content.res.Resources;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DbAdapter {
public DbAdapter() {
Resources res = getResources();//error: The method getResources() is undefined for the type DbAdapter
//also tyed context.getResources()
}
}
采纳答案by ccheneson
getResoucesis a method of a Context.
So you can pass the context to your DbAdapter constructor and call getResourcesfrom it :
getResouces是一个Context的方法。因此，您可以将上下文传递给 DbAdapter 构造函数并getResources从中调用：
public DbAdapter(Context context) {
Resources res = context.getResources();//error: The method getResources() is undefined for the type DbAdapter
//also tied context.getResources()
}
回答by Ujwal Tale
Define Context'sobject and then call all the R.<Methods>with the help of contextobject .
定义Context'sobject 然后R.<Methods>在contextobject的帮助下调用所有的。
Eg:
例如：
Context ctx;
ctx.getResources().getString(R.string.Forgot_message);
Above code is working for me .
上面的代码对我有用。
回答by Patapoom
If your Adapter is for example an ArrayAdapter, you can use this:
例如，如果您的适配器是一个 ArrayAdapter，您可以使用它：
getContext().getResources();
getContext().getResources();
