Java Android Studio:将URL从URL保存到数组
我试图让Android Studio将文本文件从URL读入字符串数组。然后,使用毕加索内的URL显示一个简单的图库。下面是我实现这一目标的尝试 我的Java Android Studio:将URL从URL保存到数组,java,android,arrays,android-studio,Java,Android,Arrays,Android Studio,我试图让Android Studio将文本文件从URL读入字符串数组。然后,使用毕加索内的URL显示一个简单的图库。下面是我实现这一目标的尝试 我的GrabData.java脚本: public class GrabData { static public String[] LIST = {}; public static void main(String[] args) { ReadFile rf = new ReadFile(); // The text file.
GrabData.java
脚本:
public class GrabData
{
static public String[] LIST = {};
public static void main(String[] args)
{
ReadFile rf = new ReadFile();
// The text file.
String filename = "http://www.example.com/my/website/directory/thefile.txt";
try
{
String[] LIST = rf.readLines(filename);
for (String line : LIST)
{
System.out.println(LIST);
}
}
catch(IOException e)
{
System.out.println("ReadFile : Unable to create "+filename+": "+e.getMessage());
}
}
}
public class ReadFile extends Activity
{
public String[] readLines(String filename) throws IOException
{
FileReader fileReader = new FileReader(filename);
BufferedReader bufferedReader = new BufferedReader(fileReader);
List<String> lines = new ArrayList<String>();
String line = null;
while ((line = bufferedReader.readLine()) != null)
{
lines.add(line);
}
bufferedReader.close();
return lines.toArray(new String[lines.size()]);
}
}
我的ReadFile.java
脚本:
public class GrabData
{
static public String[] LIST = {};
public static void main(String[] args)
{
ReadFile rf = new ReadFile();
// The text file.
String filename = "http://www.example.com/my/website/directory/thefile.txt";
try
{
String[] LIST = rf.readLines(filename);
for (String line : LIST)
{
System.out.println(LIST);
}
}
catch(IOException e)
{
System.out.println("ReadFile : Unable to create "+filename+": "+e.getMessage());
}
}
}
public class ReadFile extends Activity
{
public String[] readLines(String filename) throws IOException
{
FileReader fileReader = new FileReader(filename);
BufferedReader bufferedReader = new BufferedReader(fileReader);
List<String> lines = new ArrayList<String>();
String line = null;
while ((line = bufferedReader.readLine()) != null)
{
lines.add(line);
}
bufferedReader.close();
return lines.toArray(new String[lines.size()]);
}
}
public类ReadFile扩展活动
{
公共字符串[]读取行(字符串文件名)引发IOException
{
FileReader FileReader=新的FileReader(文件名);
BufferedReader BufferedReader=新的BufferedReader(文件阅读器);
列表行=新的ArrayList();
字符串行=null;
而((line=bufferedReader.readLine())!=null)
{
行。添加(行);
}
bufferedReader.close();
返回lines.toArray(新字符串[lines.size()]);
}
}
但是,当我尝试在文件名字符串中使用URL时,它不会在图库中显示任何图像,而图库可以从数组中加载。我猜这个方法无法读取URL。如果有人对如何获取此信息有任何帮助,我们将不胜感激。import android.app.Activity;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new MyAsyncFileReader().execute("http://www.example.com/my/website/directory/thefile.txt");
}
public static class MyAsyncFileReader extends AsyncTask<String, Void,String []>
{
@Override
protected String [] doInBackground(String... params){
String url= params[0];
List<String> lines = new ArrayList<String>();
try{
URL u= new URL(url);
HttpURLConnection conn= (HttpURLConnection) u.openConnection();
InputStream is= conn.getInputStream();
BufferedReader br =new BufferedReader(new InputStreamReader(is));
String line=null;
while((line=br.readLine())!=null){
lines.add(line);
}
br.close();
}catch(Exception e){
}
return lines.toArray(new String[lines.size()]);
}
@Override
protected void onPostExecute(String[] strings) {
//You will get your string array result here .
// do whatever operations you want to do
for(int i=0;i<strings.length;i++){
Log.e("LOG", strings[i]);
}
}
}
}
导入android.os.AsyncTask;
导入android.os.Bundle;
导入java.io.BufferedReader;
导入java.io.InputStream;
导入java.io.InputStreamReader;
导入java.net.HttpURLConnection;
导入java.net.URL;
导入java.util.ArrayList;
导入java.util.List;
公共类MainActivity扩展了活动{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
新建MyAsyncFileReader()。执行(“http://www.example.com/my/website/directory/thefile.txt");
}
公共静态类MyAsyncFileReader扩展了AsyncTask
{
@凌驾
受保护字符串[]doInBackground(字符串…参数){
字符串url=params[0];
列表行=新的ArrayList();
试一试{
URL u=新的URL(URL);
HttpURLConnection conn=(HttpURLConnection)u.openConnection();
InputStream is=conn.getInputStream();
BufferedReader br=新的BufferedReader(新的InputStreamReader(is));
字符串行=null;
而((line=br.readLine())!=null){
行。添加(行);
}
br.close();
}捕获(例外e){
}
返回lines.toArray(新字符串[lines.size()]);
}
@凌驾
受保护的void onPostExecute(字符串[]字符串){
//您将在此处获得字符串数组结果。
//做你想做的任何操作
对于(int i=0;i粘贴您的库URL也FileReader
无法通过http读取文件,您需要HTTPUrlConnection
来读取它。快速问题。这是什么导入?好的,我已将代码与导入粘贴在一起,它显示了一些非常混乱的错误。错误:错误:(26,23)错误:“;”应为;;;显示更多内容,但不允许我复制/粘贴。如果您需要,我可以获取屏幕截图。我想我现在应该发布整个代码。我也会这样做。:)更新代码,请查看是否有帮助。现在应该不会出现任何错误。好的,现在不会出现任何错误。已测试并显示空白屏幕(暂时).很抱歉问了这么多问题,但最终的结果会是什么?