0

我正在尝试构建一个将读取文本文件的应用程序，然后将每一行文本存储为数组列表。

这是我的文本文件：

1 , Where is the white house? , Paris , Amsterdam , New York , Washington 
2 , The Sopranos Is a..? , Italian Food , Tv series , Kind of Knife , A Book
3 , The Capital City Of Brazil is? , Rio de Janeiro, Amsterdam , Brazilia , Washington
4 ,Who Invanted The Phone ?, Alexander Graham Bell, Albert Einstein , Pinokio , Snoop Doog

我基本上是在尝试构建一个琐事应用程序，它将从文本文件中选择每一行，然后将选定的行拆分为字符串数组，最后在屏幕上打印一个问题和四个答案。

到目前为止，这是我的代码：

public class QuestionSql extends Activity {

    private String[] value;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.highscore);
        readFile();

    }


    private void readFile() {
        // TODO Auto-generated method stub
        AssetManager manger;
        String line = null;

        try {
            manger = getAssets();
            InputStream is = manger.open("text.txt");
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            while ((line = br.readLine()) != null) {
                value = line.split(",");


                //System.out.print(value);
            }
            br.close();


        } catch (IOException e1) {
            System.out.println("not good");

        }

    }

}

问题是应用程序只打印文本文件的最后一行

谢谢你的答案，它真的帮助了我！到目前为止，这是我的代码：

公共类 QuestionSql 扩展 Activity {

private String[] value;
private List<String[]> collection;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.highscore);

    readFile();
    convertListToString()
}


  private void convertListToString() {


    value = collection.toArray(new String[collection.size()]);

  }







private void readFile() {
    // TODO Auto-generated method stub
    AssetManager manger;
    String line = null;
    collection = new ArrayList<String[]>();

    try {
        manger = getAssets();
        InputStream is = manger.open("text.txt");
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        while ((line = br.readLine()) != null) {
            value = line.split(",");
           collection.add(value);

        }
        br.close();


    } catch (IOException e1) {
        System.out.println("not good");

    }

}

}

现在，我需要转换 :collection = new ArrayList(); 进入 string[] 以便我可以在我的应用程序按钮上设置文本。有任何想法吗？

4

3 回答 3

1

如果要将每一行存储到字符串数组中，则需要创建“字符串数组结构”

因此，最有效的选择是创建List<String[]>将保存您的字符串数组。

您的方法不起作用的原因是您为每一行分配了新值到相同的字符串数组（总是被重写）并且在循环之后您的字符串数组包含最后一行的值。

List<String[]> collection = new ArrayList<String[]>();
String[] temp;
while ((line = br.readLine()) != null) {
   temp = line.split(",");
   if (temp.length > 0) {
      collection.add(temp);
   }
}

但是，如果您想创建仅包含您的值的列表（我有点困惑），您可以使用：

List<String> collection = new ArrayList<String>();
String[] temp;
while ((line = br.readLine()) != null) {
   temp = line.split(",");
   if (temp.length > 0) {
      for (String s: temp) {
         collection.add(s);
      }
   }
}
于 2013-04-06T15:51:11.213 回答
0

您可以将所有拆分行存储到ArrayList：

private ArrayList<String[]> values;
@Override
protected void onCreate(Bundle savedInstanceState) {
    values = new ArrayList<String[]>();
    super.onCreate(savedInstanceState);
    setContentView(R.layout.highscore);
    readFile();
}


private void readFile() {
    // TODO Auto-generated method stub
    AssetManager manger;
    String line = null;

    try {
        manger = getAssets();
        InputStream is = manger.open("text.txt");
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        while ((line = br.readLine()) != null) {
            values.add(line.split(","));
            //System.out.print(value);
        }
        br.close();

    } catch (IOException e1) {
        System.out.println("not good");
    }
}
于 2013-04-06T15:51:01.973 回答
0

你能试试这个

private void readFile() {
    // TODO Auto-generated method stub
    AssetManager manger;
    String line = null;

    try {
        manger = getAssets();
        InputStream is = manger.open("text.txt");
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        while ((line = br.readLine()) != null) {
           String[] value = line.split(",");

           for(int i=0;i<value.length;i++)
               System.out.print("*************************************************"+value[i]);
        }
        br.close();


    } catch (IOException e1) {
        System.out.println("not good");

    }

}
于 2013-04-06T16:07:07.920 回答