將按鈕加載到ListView中-Android Studio

Question

我正在創建一個動態菜單，該菜單從文件讀取並為該文件中的整個按鈕創建一個按鈕。 我可以在下面的代碼中看到，使用simple_list_item_1加載列表，但是它調用.toString方法，因此該列表被作為內存引用的文本占用，而不是按鈕的內容，不是實際的按鈕。 我已經讀完書了，也不知道該怎么做，因為我讀到的東西遠遠超出了我的需要。 當代碼從Widget庫中制作普通按鈕時，最終的工作是使用ImageButton。 我尚未制作圖像，因此該按鈕是“調試”占位符。 （對不起，但是這是不必要的信息，只是說如果有人有更好的主意，然后列出按鈕即可。）

謝謝！

這是我的代碼：

public class GameSelect extends Activity {
private IDGen makeID = new IDGen();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //This is the main layout of the Activity
    RelativeLayout gameSelectMenu = new RelativeLayout(this);
    //Rules for the Title
    RelativeLayout.LayoutParams titleZone = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT
    );
    titleZone.addRule(RelativeLayout.CENTER_HORIZONTAL);
    titleZone.addRule(RelativeLayout.ALIGN_PARENT_TOP);

    //This is the Title
    ImageView titleImage = new ImageView(this);
    titleImage.setBackgroundResource(R.drawable.gameselect_gameselecttitle);
    gameSelectMenu.addView(titleImage, titleZone);

    //Rules for the Button Panel
    RelativeLayout.LayoutParams buttonPanelPram = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT
    );
    buttonPanelPram.addRule(RelativeLayout.CENTER_VERTICAL);
    buttonPanelPram.addRule(RelativeLayout.CENTER_HORIZONTAL);

    //This is the sub-parent
    final RelativeLayout selectedGameMenu = new RelativeLayout(this);
    //selectedGameMenu.setId(idParent);
    selectedGameMenu.setBackgroundColor(Color.GRAY);

    //TODO The prams for this needs to be better.
    //This is the LinearLayout
    ListView buttonPanel = new ListView(this);
    ArrayList<Button> btnList = new ArrayList<>();

    try {
        //This is used to declare the AssetManager
        AssetManager content = getAssets();
        //We load the file into the Stream
        InputStream input = content.open("PlayerDataSheet.txt");
        //Buffer the Stream here
        BufferedReader buff = new BufferedReader(new InputStreamReader(input));
        //Load the first line of stream into this var
        String line = buff.readLine();
        //Starts the Dynamic button process
        while (line != null) {
            Button gameBtn = new Button(this);
            gameBtn.setText(line);
            gameBtn.setId(makeID.newID());
            gameBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    selectedGameMenu.setVisibility(View.VISIBLE);
                }
            });
            btnList.add(gameBtn);
            line = buff.readLine();
        }
        //Closing all streams that were opened.  May have been the reason for frame loss
        buff.close();
        input.close();

        ListAdapter btnAdp = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, btnList);
        buttonPanel.setAdapter(btnAdp);
    } catch (FileNotFoundException e) {
        Log.e("File", "File for button data was not found");
    } catch (IOException e) {
        Log.e("File", "File was found, input stream is empty");
    }

    //Adds the newly filled button panel to the main parent
    gameSelectMenu.addView(buttonPanel, buttonPanelPram);
    buttonPanel.setVisibility(View.VISIBLE);

    //This is just a testing line to occupy the sub-parent until I have what I need
    TextView testingOne = new TextView(this);
    testingOne.setText("If you see this it worked!");
    selectedGameMenu.addView(testingOne);
    selectedGameMenu.setVisibility(View.INVISIBLE);

    //Rules for the SubParent
    RelativeLayout.LayoutParams subParent = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT
    );
    subParent.addRule(RelativeLayout.CENTER_VERTICAL);
    subParent.addRule(RelativeLayout.CENTER_HORIZONTAL);

    //Adds the sub-parent to the main parent
    gameSelectMenu.addView(selectedGameMenu, subParent);

    setContentView(gameSelectMenu);

    }
}

Answer 1

ListView具有“ OnItemSelctedListener”，它將告訴您選擇了哪個項目。 最好創建一個Java Object EX GameItem來代表文件的一行：

public class GameItem{
    private String gameName;

   //getters and setters

   @Override
   public String toString(){
       return gameName;
   }
}

然后，您將替換以下代碼：

ArrayList<Button> btnList = new ArrayList<>();

有：

ArrayList<GameItem> btnList = new ArrayList<>();

和這個：

while(line != null)
        {
            Button gameBtn = new Button(this);
            gameBtn.setText(line);
            gameBtn.setId(makeID.newID());
            gameBtn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    selectedGameMenu.setVisibility(View.VISIBLE);
                }
            });
            btnList.add(gameBtn);
            line = buff.readLine();
        }

有：

 while(line != null)
        {
            GameItem tempGameItem = new GameItem();
            tempGameItem.setGameName(line);
            btnList.add(tempGameItem);
            line = buff.readLine();
        }

然后，您應該實現OnItemSelectedListener：

buttonPanel.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {

                selectedGameMenu.setVisibility(View.VISIBLE);
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }
        });

最后，您應該將Adapter設置為ListView：

    ListAdapter btnAdp = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1 ,btnList);
    buttonPanel.setAdapter(btnAdp);

您的代碼將如下所示：

ListView buttonPanel = new ListView(this);
buttonPanel.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> arg0, View arg1,
                        int arg2, long arg3) {

                    selectedGameMenu.setVisibility(View.VISIBLE);
                }

                @Override
                public void onNothingSelected(AdapterView<?> arg0) {
                    // TODO Auto-generated method stub

                }
});
ArrayList<Button> btnList = new ArrayList<>();

     try
    {
       //... your code
            while(line != null)
            {
                GameItem tempGameItem = new GameItem();
                tempGameItem.setGameName(line);
                btnList.add(tempGameItem);
                line = buff.readLine();
            }
        //Closing all streams that were opened.  May have been the reason for frame loss
        buff.close();
        input.close();

        ListAdapter btnAdp = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1 ,btnList);
        buttonPanel.setAdapter(btnAdp);
    }

    //... your code