onListItemClick ListView不工作 - Android

Question

我想實現OnListItemClick但似乎無法得到它的工作。沒有錯誤來了，沒有強制關閉等。下面是我的代碼：

package com.odhranlynch.filmCollection; 

import java.io.BufferedInputStream; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.URL; 
import java.net.URLConnection; 
import java.util.ArrayList; 

import org.apache.http.util.ByteArrayBuffer; 

import android.app.Activity; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.SQLException; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 

public class Main extends Activity { 
/** Called when the activity is first created. */ 
private final String databaseFilename = "/films.db"; //filename 
private final String url = "www.somesite.com"; //download database from here 
ArrayList<FilmRecord> films = new ArrayList<FilmRecord>(); 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    DownloadFromUrl(url, databaseFilename); 

    ListView listView = (ListView) findViewById(R.id.lstFilms); 
    listView.setAdapter(new FilmItemAdapter(this, android.R.layout.simple_list_item_1, films)); 
} 


protected void onListItemClick(ListView l, View v, int position, long id) 
{ 
    //ListItem clicked. 
    Log.d("ListView", String.valueOf(l.getSelectedItemPosition())); 
} 

public void DownloadFromUrl(String DownloadUrl, String fileName) { 
    try { 
     File root = android.os.Environment.getExternalStorageDirectory();    

     File dir = new File (root.getAbsolutePath() + "/Android/data/com.odhranlynch.filmcollection"); 
     if(dir.exists()==false) { 
      dir.mkdirs(); 
     } 

     URL url = new URL(DownloadUrl); //you can write here any link 
     File file = new File(dir, fileName); 

     long startTime = System.currentTimeMillis(); 
     Log.d("DownloadManager", "download begining"); 
     Log.d("DownloadManager", "download url:" + url); 
     Log.d("DownloadManager", "downloaded file name:" + fileName); 

     /* Open a connection to that URL. */ 
     URLConnection ucon = url.openConnection(); 

     /* 
     * Define InputStreams to read from the URLConnection. 
     */ 
     InputStream is = ucon.getInputStream(); 
     BufferedInputStream bis = new BufferedInputStream(is); 

     /* 
     * Read bytes to the Buffer until there is nothing more to read(-1). 
     */ 
     ByteArrayBuffer baf = new ByteArrayBuffer(5000); 
     int current = 0; 
     while ((current = bis.read()) != -1) { 
      baf.append((byte) current); 
     } 


     /* Convert the Bytes read to a String. */ 
     FileOutputStream fos = new FileOutputStream(file); 
     fos.write(baf.toByteArray()); 
     fos.flush(); 
     fos.close(); 
     Log.d("DownloadManager", "download ready in" + ((System.currentTimeMillis() - startTime)/1000) + " sec"); 

     //Download completed, run populateFields method. 
     populateFields(); 

} catch (IOException e) { 
    Log.d("DownloadManager", "Error: " + e); 
    } 
} 

public class FilmItemAdapter extends ArrayAdapter<FilmRecord> { 
    private ArrayList<FilmRecord> films; 

    public FilmItemAdapter(Context context, int textViewResourceId, ArrayList<FilmRecord> films) { 
     super(context, textViewResourceId, films); 
     this.films = films; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View v = convertView; 
     if (v == null) { 
      LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      v = vi.inflate(R.layout.listitem, null); 
     } 

     FilmRecord film = films.get(position); 
     if (film != null) { 
      TextView filmTitle = (TextView) v.findViewById(R.id.username); 
      TextView filmShowingDate = (TextView) v.findViewById(R.id.email); 

      if (filmTitle != null) { 
       filmTitle.setText(film.filmTitle); 
      } 

      if(filmShowingDate != null) { 
       filmShowingDate.setText("Showing on " + film.filmShowingDate); 
      } 
     } 
     return v; 
    } 
} 

public class FilmRecord { 
    public String filmTitle; 
    public String filmShowingDate; 

    public FilmRecord(String username, String email) { 
     this.filmTitle = username; 
     this.filmShowingDate = email; 
    } 
} 

public void populateFields() { 
    //Populate the views with database content. 


    DataBaseHelper myDbHelper = new DataBaseHelper(this);; 
    myDbHelper = new DataBaseHelper(this); 

    //Load "productDatabase" database (see assets to left). 
    { 
     try { 
      myDbHelper.createDataBase();} 
     catch (IOException ioe) { 
      throw new Error("Unable to create database");} 

     try { 
      myDbHelper.openDataBase();} 
     catch(SQLException sqle){ 
      throw sqle;} 
    } 

    //---Get all records from database--- 
    myDbHelper.openDataBase(); 
    Cursor cursorPosition = myDbHelper.getAllTitles(); 


    if (cursorPosition.moveToFirst()) 
    { 
    do { 
    AddRecordToArray(cursorPosition); 
    } while (cursorPosition.moveToNext()); 
    } 
    myDbHelper.close(); 
    } 

    public void AddRecordToArray(Cursor cursorPosition) 
    { 
     //Add new record to array (which gets data from database using cursorPosition (for current row) and .getstring(for column number). 
     FilmRecord film1 = new FilmRecord(cursorPosition.getString(1), cursorPosition.getString(4)); 
     films.add(film1); 
    } 
} 

我會很感激，如果有人能好心幫助我在這一個:)

Answer 1

您沒有將監聽器設置爲列表。你需要的東西是這樣的：

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    DownloadFromUrl(url, databaseFilename); 

    ListView listView = (ListView) findViewById(R.id.lstFilms); 
    listView.setAdapter(new FilmItemAdapter(this, android.R.layout.simple_list_item_1, films)); 
    listView.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> adapter, View view, int pos, long id) { 
       Log.d("ListView", String.valueOf(pos)); 
      } 
    }); 
} 

您可能還需要一些方法添加到您的適配器實現以訪問您的陣列的特定元素。

Answer 2

問題是，你是從活動而不是ListActivity擴展。 如果你想擴展活動，也許你可以改變你的代碼。

public class Main extends Activity implements OnItemClickListener 

，並在您的onCreate函數的末尾上的onCreate添加

listView.setOnItemClickListener(this); 

Answer 3

使用此代碼：

listView.setOnItemClickListener(new ClickOnList()); 

使用這個類ClickOnList

class ClickOnList implements OnItemClickListener 
    { 
     @Override 
     public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
       long arg3) { 
      Log.d("ListView", "Position"+arg2); 

     } 

    }