Question

嗯，我搜索了很多信息，但我仍然没有得到它。如何在Android上使用ListView列出所有ftp文件？

是否有任何示例，或简单的编码来解释我该怎么做。

我知道如何制作样本ListView

public class MainActivity extends ListActivity {
   TextView selection;
   String[] items;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      items=getResources().getStringArray(R.array.planets_array);
      setListAdapter(new ArrayAdapter<String>(this,
         android.R.layout.simple_list_item_1, items));
      selection=(TextView)findViewById(R.id.selection);
   }

   public void onListItemClick(ListView parent, View v, int position, long id){
      selection.setText("Planet - "+items[position]);
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
   }
}

我的编码可以在Eslipse上显示服务器中的文件。

public void ftpPrintFilesList(String dir_path)
{
    try {
        FTPFile[] ftpFiles = mFTPClient.listFiles(dir_path);
        int length = ftpFiles.length;

        for (int i = 0; i < length; i++) {
            String name = ftpFiles[i].getName();
            boolean isFile = ftpFiles[i].isFile();

            if (isFile) {
                Log.i(TAG, "File : " + name);
            }
            else {
                Log.i(TAG, "Directory : " + name);
            }

        }
    } catch(Exception e) {
        e.printStackTrace();
    }
}

但我不知道如何将文件信息放入ListView。我对编码很不好，请帮忙。谢谢。

更新

重建编码后，显示错误，我将编码复制到那里。

MainActivity.java

public class MainActivity extends ListActivity have error implements OnClickListener {



String mString = "/";
private Context cntx = null;
TextView selection;
private ArrayList<String> fileNames;
MyFTPClient ftpclient = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, fileNames));
    selection=(TextView)findViewById(R.id.selection);
    cntx = this.getBaseContext();
    ListView list = (ListView)findViewById(android.R.id.list);


    View button5 = findViewById(R.id.button5);
    button5.setOnClickListener(this);

    ftpclient = new MyFTPClient();} 

    public void onClick(View v) {
    switch(v.getId()) {
    case R.id.button5:
    setContentView(R.layout.ftpfile);
    new Thread(new Runnable() {

    public void run(){
    ftpclient.ftpPrintFilesList(mString);} }).start();
    break;
    }
        }

这是我在其他java文件中使用的方法：

public ArrayList<String> ftpPrintFilesList(String dir_path)
{
    ArrayList<String> validFileNames = new ArrayList<String>();
    try {
        FTPFile[] ftpFiles = mFTPClient.listFiles(dir_path);
        int length = ftpFiles.length;

        for (int i = 0; i < length; i++) {
            String name = ftpFiles[i].getName();
            boolean isFile = ftpFiles[i].isFile();

            if (isFile) {
                validFileNames.add(name);
                Log.i(TAG, "File : " + name);
            }
            else {
                Log.i(TAG, "Directory : " + name);
            }

        }
    } catch(Exception e) {
        e.printStackTrace();
    }
    return validFileNames;
}

这是我的ListView页面（xml），名为ftpfile.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<TextView
android:id="@+id/selection"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#FF0000"
android:textColor="#FFFFFF"
/>


<ListView android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:drawSelectorOnTop="false"
/>

和LogCat

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.ftptest/com.example.ftptest.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'

抱歉，如果这太长了，但我真的需要解决问题。请帮忙谢谢。

Answer 1

您已经完成了大部分编码工作。我已经编辑了一些代码

public class MainActivity extends ListActivity {

    private TextView selection;
    private ArrayList<String> fileNames;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        fileNames = ftpPrintFilesList(pathOfFTPDirectory); 

        setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, fileNames));
        selection=(TextView)findViewById(R.id.selection);
    }

    public void onListItemClick(ListView parent, View v, int position, long id){
        selection.setText("Planet - "+ fileNames.get(position));

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public ArrayList<String> ftpPrintFilesList(String dir_path)
    {
        ArrayList<String> validFileNames = new ArrayList<String>();
        try {
            FTPFile[] ftpFiles = mFTPClient.listFiles(dir_path);
            int length = ftpFiles.length;

            for (int i = 0; i < length; i++) {
                String name = ftpFiles[i].getName();
                boolean isFile = ftpFiles[i].isFile();

                if (isFile) {
                    validFileNames.add(name);
                    Log.i(TAG, "File : " + name);
                }
                else {
                    Log.i(TAG, "Directory : " + name);
                }

            }
        } catch(Exception e) {
            e.printStackTrace();
        }
        return validFileNames;
    } 
}

修改

在xml中更改此内容以删除错误

android:id="@android:id/list"

到

android:id="@+id/list"

如何使用ListView列出所有ftp文件？

更新

1 个答案: