Question

我有一个包含此信息的文本文件

Casino Canberra; 21 Binara Street，Canberra ACT，2601;堪培拉赌场是位于澳大利亚首都堪培拉中心城市Civic的赌场。与澳大利亚的其他赌场相比，赌场相对较小。;（02）6257 7074; www.canberracasino.com.au

堪培拉国家博物馆; Parkes Place，Canberra ACT，2601;澳大利亚国家博物馆探索澳大利亚的土地，国家和人民。每天上午9点至下午5点开放，圣诞节除外。一般入场免费。;（02）6240 6411; www.nga.gov.au

存储在SD卡

中

之后我使用此方法检索值

package au.edu.canberra.g30813706;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

import android.app.Activity;
import android.os.Environment;


public class FileReader extends Activity{{

    ArrayList<read> sInfo = new ArrayList<read>();
    ArrayList<String> sLines = new ArrayList<String>();
    String line;
    String[] saLineElements;
String txtName = "AccomodationTxt.txt";
File root = Environment.getExternalStorageDirectory();
File path = new File(root, "CanberraTourism/" + txtName);

try {
    BufferedReader br = new BufferedReader (
                        new InputStreamReader(
                        new FileInputStream(path)));

    while ((line = br.readLine()) != null)
    {
        sLines.add(line);
        //The information is split into segments and stored into the array
        saLineElements = line.split(";");
        //for (int i = 0; i < saLineElements.length; i++) 
            //  sInfo.add(new read(saLineElements[i]));
        sInfo.add(new read(saLineElements[0], saLineElements[1], saLineElements[3], saLineElements[4], saLineElements[5]));     
    }
     br.close();
} 
catch (FileNotFoundException e) {
    System.err.println("FileNotFoundException: " + e.getMessage());
} 
catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}}
}

但我也有对象类来存储每个单独的项目

package au.edu.canberra.g30813706;

public class read {

    public String name;
    public String address;
    public String info; 
    public String phone;
    public String www;


    public read (String name, String address, String info, String phone, String www)
    {
        this.name = name;
        this.address = address;
        this.info = info;
        this.phone = phone;
        this.www = www;
    }

}

我唯一的问题是试图在文本视图中显示信息，我不知道如何调用我需要的值

这是我试图插入它的地方

package au.edu.canberra.g30813706;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import au.edu.canberra.g30813706.FileReader;
import au.edu.canberra.g30813706.read;

public class Accommodation_info  extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.accommodation_layout);


    }}

Answer 1

您应该考虑使用Application类。您可以将Application视为无GUI的活动，其功能类似于遵循MVC模式的程序中的模型。您可以将所有读取的对象放入应用程序中的数据结构中，然后使用您自己设计的访问器和更改器访问它们。

看看这位官方doc。

正如您的代码所代表的那样，您只能通过获取对FileReader类的引用来访问您的读取实例，但您的两个活动是单独的实体。你必须做这样的事情：

// This is the main activity and should be launched first
// Check your manifest to make sure it launches with this activity

package au.edu.canberra.g30813706;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import au.edu.canberra.g30813706.FileReader;
import au.edu.canberra.g30813706.read;

public class Accommodation_info  extends Activity
{
    // Declare the file reader so you'll have a reference

    FileReader reader;

    @Override
    protected void onCreate(Bundle savedInstanceState) {        
        super.onCreate(savedInstanceState);
        setContentView(R.layout.accommodation_layout);

    // Instantiate the file reader

    reader = new FileReader();

    // Now you can access the array inside FileReader

    // obviously, you need to have a text view called my_textView defined in the
    // layout file associated with this activity

    TextView myTextView = (TextView)findViewById(R.id.my_textView);
    // displays the first element in FileReader's array list
    myTextView.setText((String)reader.get(0));
    }}

目前，您可能对目前对Android和/或Java的理解有所了解。我建议您尽可能多地使用代码示例，熟悉Android，然后在获得更多经验时再回到项目中。

从AVD SD卡读取文件并显示文本视图

1 个答案: