數組列表，列表視圖和按鈕

Question

我已經花了幾天的時間進行研究，並且我還沒有找到我正在尋找的答案，所以也許你們可以幫助一下。

我的應用程序是一個交易卡甲板生成器。我有兩個ArrayLists，數據庫和currentDeck，兩者都在按照他們的要求工作。我試圖完成的任務是將所選的數據庫項目添加爲currentDeck中的新項目。

下面是主要方法：

public class DeckBuilderActivity extends ActionBarActivity { 

ArrayList<Card> database = new ArrayList<Card>(); //create new arraylist of datatype card 
ArrayList<Card> currentDeck = new ArrayList<Card>(); //create arraylist for currently loaded deck 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    Intent intent = getIntent(); 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_deck_builder); 

    //begin method to create main database. 
    cardfightMainDatabase(database); 

    //format display in listview 
    DatabaseAdapter adapter = new DatabaseAdapter(this, database); 
    ListView lv = (ListView) findViewById(R.id.card_database_listview); 
    lv.setAdapter(adapter); 

    //format display in deck view 
    DeckAdapter adapter2 = new DeckAdapter(this, currentDeck); 
    GridView gv = (GridView) findViewById(R.id.deckGridView); 
    gv.setAdapter(adapter2); 

    //set up click event 
    AdapterView.OnItemClickListener mMessageClickedHandler = new AdapterView.OnItemClickListener() { 
     public void onItemClick(AdapterView parent, View v, int position, long id) { 

      //link image view 
      ImageView iv = (ImageView) findViewById(R.id.cardDisplay); 

      //link scrollable textview 
      TextView tv = (TextView) findViewById(R.id.cardDataDisplay); 

      // Do something in response to the click 
      //set image id 
      int imageId = database.get(position).getCardImgID(); 

      //display image to imageview 
      iv.setImageResource(imageId); 

      //display text to textview 
      //Print card name, expansion, card number, skill and flavor text to scrollable textview 
      tv.setText(database.get(position).getCardName() + "\nExpansion Set: " + database.get(position).getExpansion() + 
         "\nCard #: " + database.get(position).getCardNum() + "\nSkill:\n" + database.get(position).getUnitSkill() 
       + "\nFlavor Text:\n" + "\"" + database.get(position).getCardLore()+ "\""); 

     } 
    }; 

    lv.setOnItemClickListener(mMessageClickedHandler); 
} //end OnCreate Method 

數據庫適配器

public class DatabaseAdapter extends ArrayAdapter<Card> { 


//constructor 
public DatabaseAdapter(Context context, ArrayList<Card> database) 
{ 
    super(context, 0, database); //call parent 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent){ 
    //get the data item for this position 
    Card card = getItem(position); 
    //check if an existing view is being reused, otherwise inflate the view 



    if (convertView == null) { 
     convertView = LayoutInflater.from(getContext()).inflate(database_layout, parent, false); 
    } 
    //Lookup view for data population 
    ImageView cardIcon = (ImageView) convertView.findViewById(R.id.card_icon); 
    TextView cardInfo = (TextView) convertView.findViewById(R.id.card_info); 
    TextView cardStats = (TextView) convertView.findViewById(R.id.card_stats); 

    //set text views 
    cardInfo.setText("<" + card.getUnitGrade() + ">" + " " + card.getCardName()); 
    cardStats.setText("Power " + card.getUnitPower() + " Shield: " + card.getUnitShield()); 
    //set image view 
    int cardIconId = card.getCardImgID(); //get image assigned to card and store as local int 
    cardIcon.setImageResource(cardIconId); //populate imageview in list 
    return convertView; 
    } 

最後甲板視圖適配器

public class DeckAdapter extends ArrayAdapter<Card> { 

public DeckAdapter(Context context, ArrayList<Card> currentDeck) 
{ 
    super(context, 0, currentDeck); //call parent as constructor 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) 
{ 
    //get data from card 
    Card card = getItem(position); 

    //check if an existing view is being reused, otherwise inflate the view 

    if (convertView == null) { 
     convertView = LayoutInflater.from(getContext()).inflate(deck_layout, parent, false); 
    } 
    //get imageView and link to grid display 
    ImageView iv = (ImageView) convertView.findViewById(R.id.grid_item_image); 

    //get imageview id 
    int cardIconId = card.getCardImgID(); //get image assigned to card and store as local int 
    iv.setImageResource(cardIconId); //set image to view 
    return convertView; 

} 

}

在理論上，我想做一個

addButton = (Button) findViewById(R.id.addToDeckButton); 
      addButton.setOnClickListener(new View.OnClickListener() { 

       public void onClick(View v, int position) { 

        currentDeck.add(database.get(position)); 
        adapter.notifyDataSetChanged(); 
       } 

，放入數據庫適配器的getView（）方法，但我不能讓它的工作，無論我在那裏扔。有什麼建議麼？

Answer 1

我想通了。通過在on-item點擊方法中放置onClick方法，我產生了我想要的結果。我真的很難過，那很簡單。試圖弄清楚這一點，我失去了四天的時間。

 //set up click event for database 
    AdapterView.OnItemClickListener mMessageClickedHandler = new AdapterView.OnItemClickListener() { 
     public void onItemClick(final AdapterView parent, View v, final int position, long id) { 
      //link image view 
      ImageView iv = (ImageView) findViewById(R.id.cardDisplay); 
      //link scrollable textview 
      TextView tv = (TextView) findViewById(R.id.cardDataDisplay); 
      // Do something in response to the click 
      //set image id 
      int imageId = database.get(position).getCardImgID(); 
      //display image to imageview 
      iv.setImageResource(imageId); 

      //Configure button click event 
      addButton.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        //add card from database to current deck 
        currentDeck.add(database.get(position)); 
        adapter2.notifyDataSetChanged(); 
       } 
      });