未顯示Android對話框

Question

想到讓對話框顯示的人會如此困難。在C＃中，它非常簡單。我一直在尋找幫助，每一個小費似乎給我帶來了麻煩而不是好處。有人可以看看下面的代碼，並告訴我哪裏可能出錯了嗎？

我想要的是非常簡單的。用戶點擊按鈕。然後列表出現。然後用戶點擊列表中的一個項目，出現對話框。 listview事件中onItemClick中的代碼來自其他人。它顯然適用於那個人。我一直點擊，看不到任何東西。我願意提供關於如何解決這個問題的建議，或者一起提供新的代碼。對不起，日誌沒有錯誤信息。

請具體說明我把代碼放在哪裏，因爲我是Android noob。並提前謝謝你！

public class SetPrediction extends Activity 
{ 
    Button btnInsrt, btnFTeam, btnSTeam; 
    ArrayList<NameValuePair> nameValuePairs; 
    TextView txtGameTeams; 
    Bundle recdData; 
    String game; 

    JSONArray jArray; 
    String result; 
    InputStream is; 
    StringBuilder sb; 

    ArrayList<String> fNames; 
    ListView listView; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.set_prediction); 

     nameValuePairs = new ArrayList<NameValuePair>(); 
     txtGameTeams = (TextView) findViewById(R.id.txtGameTeams); 

     recdData = getIntent().getExtras(); 
     game = recdData.getString("xxxx.xxxx.xxx"); 
     txtGameTeams.setText("xxxxxxx: " + game + " game."); 

     btnInsrt = (Button) findViewById(R.id.btnInsert); 
     btnFTeam = (Button) findViewById(R.id.btnFirstTeam); 
     btnSTeam = (Button) findViewById(R.id.btnSecondTeam); 

     btnFTeam.setText(removeSpaces(game.split("vs")[0])); 
     btnSTeam.setText(removeSpaces(game.split("vs")[1])); 

     btnSTeam.setOnClickListener(new View.OnClickListener() 
     { 
      public void onClick(View v) 
      { 
       String result = ""; 
       ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
       nameValuePairs.add(new BasicNameValuePair("players", removeSpaces(game.split("vs")[1]))); 

       fNames = new ArrayList<String>(); 
       listView = (ListView) findViewById(R.id.lstPlayerForPrediction); 

       //http post 
       try 
       { 
        HttpClient httpclient = new DefaultHttpClient(); 
        HttpPost httppost = new HttpPost("http://xxxxx/getTeamPlayers.php"); 
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 
        HttpResponse response = httpclient.execute(httppost); 
        HttpEntity entity = response.getEntity(); 
        InputStream is = entity.getContent(); 

        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
        StringBuilder sb = new StringBuilder(); 
        String line = null; 
        while ((line = reader.readLine()) != null) 
        { 
         sb.append(line + "\n"); 
        } 
        is.close(); 

        result=sb.toString(); 
       } 
       catch(Exception e) 
       { 
        Log.e("log_tag", "Error in http connection " + e.toString()); 
       } 

       //parse json data 
       try 
       { 
        JSONArray jArray = new JSONArray(result); 
        for(int i=0;i<jArray.length();i++) 
         fNames.add(jArray.getJSONObject(i).getString("First_Name")); 

       } 
       catch(JSONException e) 
       { 
        Log.e("log_tag", "Error parsing data " + e.toString()); 
       } 

       ArrayAdapter<String> adapter = new ArrayAdapter<String>(SetPrediction.this, android.R.layout.simple_list_item_1, fNames); 
       listView.setAdapter(adapter); 

       listView.setOnItemClickListener(new OnItemClickListener() 
       { 
        public void onItemClick(AdapterView<?> arg0, View predictView, int item, long arg3) 
        { 
         final CharSequence[] items = {"Online", "Away", "Do not distrub","Invisible","Offline"}; 
         AlertDialog.Builder builder = new AlertDialog.Builder(SetPrediction.this); 


         builder.setTitle("Change Status"); 
         builder.setItems(items, new DialogInterface.OnClickListener() 
         { 
          public void onClick(DialogInterface dialog, int item) 
          { 
           Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show(); 
          } 
         }); 

         AlertDialog alert = builder.create(); 
         alert.show(); 
        } 
       }); 
      } 
     }); 
    } 


    public String removeSpaces(String s) 
    { 
     StringTokenizer st = new StringTokenizer(s," ",false); 
     String t=""; 
     while (st.hasMoreElements()) t += st.nextElement(); 
     return t; 
    } 

問題出在listView.setOnItemClickListener(new OnItemClickListener()事件。那部分不起作用。

Answer 1

看看這個：

public void showAlertDialog(String title, String message, Context context) 
{ 
    final AlertDialog alertDialog = new AlertDialog.Builder(context).create(); 

    alertDialog.setTitle(title); 
    alertDialog.setMessage(message); 
    alertDialog.setButton("OK", new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      alertDialog.dismiss(); 
     } 
    }); 

    alertDialog.show(); 
} 

Answer 2

嘗試使用這些代碼，而不是你的代碼只是一個小變化:::

AlertDialog.Builder builder = new AlertDialog.Builder(SetPrediction.this).create(); 
builder.setTitle("Change Status"); 
builder.setItems(items, new DialogInterface.OnClickListener() { 
public void onClick(DialogInterface dialog, int item){ 
Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show(); 
} 
}); 
builder.show(); 

還導入以下:::

進口android.app.AlertDialog的; import android.content.DialogInterface;