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在Android中沒有onclicklistener的情況下訪問列表視圖項

[英]Accessing listview items without onclicklistener in android

我正在使用這個Android應用程序,在該應用程序中,我得到了語音記錄,以便在列表視圖中填充與所識別單詞的可能匹配項。

現在,我想訪問列表視圖的第一個元素,但是我想在列表視圖填充后立即獲取此值,而不是在選擇項目(或用戶的任何其他活動)時獲取此值。 我想使它自動化。 基本上,我希望系統盡快識別出已識別的單詞。

我了解我需要創建一個存儲已識別單詞的值的arraylist,然后將其傳遞給listview的適配器。

像這樣 -

matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
//set the retrieved list to display in the ListView using an ArrayAdapter
wordList.setAdapter(new ArrayAdapter<String> (this, R.layout.words, matches));

現在,當我嘗試通過以下方式訪問此“匹配項”數組列表時-

String test = matches.toString();

但是,此時我遇到了一些錯誤,應用程序崩潰了。 我無法使應用說出這個test字符串,也無法從中創建吐司消息。

請幫助解決此問題。

PS-識別器是否可能沒有足夠的時間來識別單詞並填充列表視圖,而我試圖在識別完成之前用它吐司消息? 我似乎無法弄清這一點,因為應用程序會在識別開始后立即崩潰。。。無論如何,是否存在延遲,以便識別器完成其工作,並且我能夠成功創建Toast消息。

任何幫助將不勝感激。

添加代碼-

//識別部分的代碼,其中對ListenToSpeech的調用將啟動識別過程並填充wordList。

private void listenToSpeech() {

    //start the speech recognition intent passing required data
    Intent listenIntent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
    //indicate package
    listenIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, getClass().getPackage().getName());
    //message to display while listening
    listenIntent.putExtra(RecognizerIntent.EXTRA_PROMPT, "Say a word!");
    //set speech model
    listenIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
    //specify number of results to retrieve
    listenIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 10);

    Toast.makeText(MainActivity.this, "SpeakDestination", Toast.LENGTH_SHORT).show();

    //start listening
    startActivityForResult(listenIntent, VR_REQUEST);


}

/**
 * onActivityResults handles:
 *  - retrieving results of speech recognition listening
 *  - retrieving result of TTS data check
 */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    //check speech recognition result 
    if (requestCode == VR_REQUEST && resultCode == RESULT_OK) 
    {
        //store the returned word list as an ArrayList
        matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
        //set the retrieved list to display in the ListView using an ArrayAdapter
        wordList.setAdapter(new ArrayAdapter<String> (this, R.layout.words, matches));
    }

    //returned from TTS data check
    if (requestCode == MY_DATA_CHECK_CODE) 
    {  
        //we have the data - create a TTS instance
        if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS)  
            repeatTTS = new TextToSpeech(this, this);  
        //data not installed, prompt the user to install it  
        else 
        {  
            //intent will take user to TTS download page in Google Play
            Intent installTTSIntent = new Intent();  
            installTTSIntent.setAction(TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);  
            startActivity(installTTSIntent);  
        }  
    }

    //call superclass method
    super.onActivityResult(requestCode, resultCode, data);
}

//我要實現的過程的代碼-

   private void dialogueControl(){

        if(initialDialogueCount<=1 && flagVar[0]==false){
            initialDialogue();
            if(initialDialogueCount>0){
                boolean speakingEnd = repeatTTS.isSpeaking();
                do{
                   speakingEnd = repeatTTS.isSpeaking();
                } while (speakingEnd);  
                Toast.makeText(MainActivity.this, "Destination", Toast.LENGTH_SHORT).show();
                listenToSpeech();    

            }

            Toast.makeText(MainActivity.this, "Something wrong here Destination", Toast.LENGTH_SHORT).show();


            initialDialogueCount++;
            if(initialDialogueCount>=2)
                flagVar[0]=true;
        }
        if(flagVar[0]==true){


                    // test is the string that I want to get from the wordList. The commented part here is what I want to do after I get that string. I want to speak that word out and ask for another input via the recognition.  The toast messages above are just to some debugging.                         


                String test = "";   

                //String ttsText = "You want to fly to "+test+" . Is that correct? Please say Yes or Noo?";
                Toast.makeText(MainActivity.this, test, Toast.LENGTH_SHORT).show();
//              if (ttsText!=null) {
//                  if (!repeatTTS.isSpeaking()) {
//                      repeatTTS.speak(ttsText, TextToSpeech.QUEUE_FLUSH, null);
//                  }
//              }
//              
//              do{
//                 speakingEnd = repeatTTS.isSpeaking();
//              } while (speakingEnd);  
//              
//              flagVar[1]=true;
//              
//              Toast.makeText(MainActivity.this, "Destination", Toast.LENGTH_SHORT).show();
//              
//              listenToSpeech();               

            }
    }

這是我的activity_main.xml中的listView

    <ListView android:id="@+id/wordList"
    android:layout_width="fill_parent"
    android:layout_height="0dip"
    android:layout_weight="1"
    android:paddingLeft="10dp"
    android:paddingTop="3dp"
    android:paddingRight="10dp"
    android:paddingBottom="3dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp"
 /> 

這是我的words.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:padding="5dp"
android:textSize="16sp" >
</TextView>

我希望這有幫助。 我真的被困住了。

您可以使用listView.setOnScrollListener(this);

這給你listview第一項,

你必須implements OnScrollListener

的使用方法

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
        int visibleItemCount, int totalItemCount) {}

在此方法中用於firstvisible項目。

我假定您在R.layout.words中使用TextView來顯示字符串,並且假定TextView id = myTextViewId。 您可以嘗試以下方法:

int position = 0; // YOUR_LISTVIEW_POSITION you want to access, 0 is the first position
TextView myTextView = (TextView) wordList.getChildAt(position).findViewById(R.id.myTextViewId);

// doing whatever you want, example: change the text value
myTextView.setText("HORAY...");

希望這個幫助...

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