ListActivity的問題

Question

以下是SettingsActivity.java的代碼。主要活動通過調用onScreenSettings（本）啓動此活動

public class SettingsActivity extends ListActivity{ 

static String[] main_settings = {"mode", 
          "timeout" 
}; 
static String[] mode = { "Audio", 
        "Video", 
        "Audio/Video" 
}; 
static String[] timeout = { 
         "1 min", 
         "5 min", 
         "10 min" 
}; 
static String result; 
static String[] display; 

boolean settings_selected = false; 
static String TAG = "****ALIST****"; 


public static void onScreenSettings(Activity c){ 

    display = main_settings; 
    Log.d(TAG,"inside onScreenSettings"); 
    Intent intent = new Intent(c.getApplication(),SettingsActivity.class); 
    try{ 
     c.startActivityForResult(intent,1); 
     Log.d(TAG,"after starting activity in onScreenSettings"); 
    }catch(Exception e){ 

    } 
} 





@Override 
public void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    Log.d(TAG,"inside onCreate-before setting listview"); 
    setListAdapter(new ArrayAdapter<String>(this, 
       android.R.layout.simple_list_item_1, display)); 
     getListView().setTextFilterEnabled(true); 
     Log.d(TAG,"inside oncreate-after setting listview"); 

} 
public void onListItemClick(ListView l, View v, int position, long id){ 
    result = (String) l.getItemAtPosition(position); 
    if(!settings_selected){ 
     if(result.equals("mode")){ 
     display = mode;   
     } 
     else if(result.equals("timeout")){ 
     display = timeout;    
     } 
     settings_selected = true; 
     Log.d(TAG,"if !setting_selected"); 

    } 
    else{/*accepting the sub options*/ 
     display = main_settings;//next the main settings must be displayed 
     if(result.equals("Audio")){ 

     } 
     else if(result.equals("Video")){ 
      Log.d(AndroidRecorder.TAG,"inside sub option Video"); 
     } 
     else if(result.equals("Audio/Video")){ 

     } 
     settings_selected = false; 
     Log.d(TAG,"if setting_selected"); 
    } 
    Intent intent = new Intent(this.getApplication(),SettingsActivity.class); 
    try{ 
     startActivityForResult(intent,1); 
     Log.d(TAG,"after starting activity in ListItemClick"); 
    } 
    catch(Exception e){ 

    } 

} 
public void onActivityResult(int requestCode, int resultCode,Intent data) { 
    //nothing to do with the intent here 
    Log.d(TAG,"inside onActivityResult"); 
    setResult(RESULT_OK, data); 
    finish(); 
    Log.d(TAG,"inside onActivityResult-after finish()"); 
} 
/*public void onBackPressed(){ 
    Log.d(TAG,"inside onBackPressed"); 
    finish(); 
    Log.d(TAG,"inside onBackPressed-after finish()"); 

}*/ 

}//end of ListActivity 

問題是控制不進入else /*accepting the sub options*/，我想不通爲什麼。因此，模式或超時列表會一再顯示，並且main_settings不會顯示。 請幫忙。

Answer 1

當您在onListItemClick中調用startActivityForResult時，您將獲得SettingsActivity的全新實例。顯示「if！setting_selected」之後logcat是否顯示「inside oncreate」？

如果確實如此，並且您不想經歷重大重構，則可以將setting_selected的值填充到intent中的額外值並將其在onCreate中拉出。