android - 如何在用户点击列表项行时显示对话框

Question

每当用户点击列表项行时，我都会尝试显示对话框，但每当我点击列表项行时什么也得不到，为什么？

在这里，我只想通过在对话框中接受来自用户的新数量来更新总值，方法是在列表行中显示该值代替数量....

CartActivity.java:

public class CartActivity extends Activity {

    ListView mLstView1;
    CartAdapter mViewCartAdpt;

    final private static int DIALOG_QUANTITY = 1;
    EditText update_quantity ;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_cart);

            mLstView1 = (ListView) findViewById(R.id.listView1);
            mViewCartAdpt = new CartAdapter(CartActivity.this);
            mLstView1.setAdapter(mViewCartAdpt);
            mLstView1.setOnItemClickListener(new OnItemClickListener() {

             @SuppressWarnings("deprecation")
            public void onItemClick(AdapterView<?> parent, View v,
                     final int position, long id) 
             {       
                 showDialog(DIALOG_QUANTITY);
            }
        }); 
    } 

    protected Dialog onCreateDialog(int id) {

        AlertDialog dialogDetails = null;
            switch (id) {
            case DIALOG_QUANTITY:
                LayoutInflater inflater = LayoutInflater.from(this);
                View dialogview = inflater.inflate(R.layout.dialog_layout, null);
                AlertDialog.Builder dialogbuilder = new AlertDialog.Builder(this);
                dialogbuilder.setTitle("Image Information");
                dialogbuilder.setView(dialogview);
                dialogDetails = dialogbuilder.create();
                break;  
            }
            return dialogDetails;
    }

    protected void onPrepareDialog(int id, Dialog dialog) {
        switch (id) {
        case DIALOG_QUANTITY:
        final AlertDialog alertDialog = (AlertDialog) dialog;
            Button updateQuantityButton = (Button) alertDialog
                    .findViewById(R.id.btn_login);
            Button cancelbutton = (Button) alertDialog
                    .findViewById(R.id.btn_cancel);
            update_quantity = (EditText) alertDialog
                    .findViewById(R.id.edit_new_qty);                   

            updateQuantityButton.setOnClickListener(new View.OnClickListener() {

                @Override
                    public void onClick(View v) {   

                }

            });

            cancelbutton.setOnClickListener(new View.OnClickListener() {
                @Override                   
                    public void onClick(View v) {
                        alertDialog.dismiss();
                    }
            });
            break;
        }
    }

    // Called when the activity begins interacting with the user
    @Override
    protected void onResume(){
        super.onResume();
        mViewCartAdpt.notifyDataSetChanged();
    }   
}

CartAdapter.java:

public class CartAdapter extends BaseAdapter {

    public static final String LOG_TAG = "CartAdapter";

    public static final String KEY_TITLE = "title";
    public static final String KEY_COST = "cost";
    public static final String KEY_QTY = "qty";
    public static final String KEY_TOTAL = "total";

    Activity activity;
    LayoutInflater inflater;
    ImageButton mImgBtnDelete;  
    ListView listView;

    private double itemamount = 0;
    private int itemquantity = 0;



    public CartAdapter(Activity a) {
        // TODO Auto-generated constructor stub
        activity = a;
        inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public int getCount() {
        // TODO Auto-generated method stub
        return Constants.sItem_Detail.size();
    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        View vi = convertView;
        if (convertView == null)
            vi = inflater.inflate(R.layout.listrow_cart, null);  // listrow_cart

         vi.setClickable(true);
         vi.setFocusable(true);          

         vi.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) 
             {                       

             }       
         }); 

            final TextView title = (TextView) vi.findViewById(R.id.title);
            final TextView qty = (TextView) vi.findViewById(R.id.qty);
            final TextView cost = (TextView) vi.findViewById(R.id.cost);
            final TextView total = (TextView) vi.findViewById(R.id.total);


            HashMap<String, String> item = new HashMap<String, String>();
            item = Constants.sItem_Detail.get(position);

            // Setting all values in listview

            title.setText(item.get(com.example.sample.ItemsActivity.KEY_TITLE));
            cost.setText(item.get(com.example.sample.ItemsActivity.KEY_COST));
            qty.setText("1");

            itemquantity = Integer.parseInt(qty.getText().toString());
            itemamount = Double.parseDouble(cost.getText().toString());
            total.setText(new DecimalFormat("##.#").format(itemamount*itemquantity));

        return vi;

    }   
}

Answer 1

将您的对话框放入您的 Activity 中，您必须在其中为 ListView 单击编写代码，在内部单击显示您的对话框，

 list.setOnItemClickListener(new OnItemClickListener() {
          public void onItemClick(AdapterView<?> myAdapter, View myView, int myItemInt, long mylng) {
         //show dialog.      

          }                 
    });

我可以看到，您的对话框有两个按钮和一个编辑框，无论要在编辑框中输入什么值，您都可以使用编辑框值更新列表值。

获取编辑框值并更新您在适配器上设置的列表数组以填充您的 ListView 。

updateQuantityButton.setOnClickListener(new View.OnClickListener() {

                @Override
                    public void onClick(View v) {   
                  // here  you have to fetch editbox value and update your arraylist and then notify your adapter.
                }

            });