如何从 arrays.xml 文件中获取字符串数组 [英] How to get String Array from arrays.xml file

问题描述

我只是想从我的 arrays.xml 中的数组中显示一个列表.当我尝试在模拟器中运行它时，我收到一条强制关闭消息.

I am just trying to display a list from an array that I have in my arrays.xml. When I try to run it in the emulator, I get a force close message.

如果我在java文件中定义数组

If I define the array in the java file

String[] testArray = new String[] {"one","two","three","etc"};

它有效，但是当我使用

it works, but when I use

String[] testArray = getResources().getStringArray(R.array.testArray);

它不起作用.

这是我的 Java 文件:

Here is my Java file:

package com.xtensivearts.episode.seven;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class Episode7 extends ListActivity {
 String[] testArray = getResources().getStringArray(R.array.testArray);

 /** Called when the activity is first created. */
 @Override
 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  // Create an ArrayAdapter that will contain all list items
  ArrayAdapter<String> adapter;

  /* Assign the name array to that adapter and 
     also choose a simple layout for the list items */ 
  adapter = new ArrayAdapter<String>(
    this,
    android.R.layout.simple_list_item_1,
    testArray);

  // Assign the adapter to this ListActivity
  setListAdapter(adapter);
 }


}

这是我的arrays.xml文件

<?xml version="1.0" encoding="utf-8"?>  
<resources>  
  <array name="testArray">  
    <item>first</item>  
    <item>second</item>  
    <item>third</item>  
    <item>fourth</item>  
    <item>fifth</item>  
  </array>
</resources>

推荐答案

你不能用这种方式初始化你的 testArray 字段，因为应用程序资源还没有准备好.

You can't initialize your testArray field this way, because the application resources still aren't ready.

只需将代码更改为:

package com.xtensivearts.episode.seven;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class Episode7 extends ListActivity {
    String[] mTestArray;

    /** Called when the activity is first created. */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Create an ArrayAdapter that will contain all list items
        ArrayAdapter<String> adapter;

        mTestArray = getResources().getStringArray(R.array.testArray);    

        /* Assign the name array to that adapter and 
        also choose a simple layout for the list items */ 
        adapter = new ArrayAdapter<String>(
            this,
            android.R.layout.simple_list_item_1,
            mTestArray);

        // Assign the adapter to this ListActivity
        setListAdapter(adapter);
    }
}

这篇关于如何从 arrays.xml 文件中获取字符串数组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！