如何使用點擊ListView中的項目來更新數量

Question

我正在編寫一個應用程序，我需要通過在ListView中點擊它來更新項目的數量，我嘗試了幾次，但仍無法解決此問題的問題，請幫我::

CartAdapter.java ::

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); 
     vi.setClickable(true); 
     vi.setFocusable(true); 
     vi.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      //here i want to put code to update product quantity 
     } 
    }); 

要刪除項目，我使用下面的代碼：

mImgBtnDelete = (ImageButton) vi 
      .findViewById(R.id.mImgBtnDelete); 
    mImgBtnDelete.setOnClickListener(new OnClickListener() { 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 

      Constants.mItem_Detail.remove(position); 
      notifyDataSetChanged(); 
      Intent mInViewCartRefresh = new Intent(activity, 
        CartActivity.class); 
      activity.startActivity(mInViewCartRefresh); 
      activity.finish(); 

     } 
    }); 

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

listrow_activity.xml：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:layout_marginBottom="5dp" 
android:layout_marginLeft="10dp" 
android:layout_marginRight="10dp" 
android:layout_marginTop="5dp" 
android:background="@drawable/btn_background" 
android:gravity="center" 
android:orientation="horizontal" 
android:padding="5dip" > 

<TextView 
    android:id="@+id/total" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/qty" 
    android:layout_alignBottom="@+id/qty" 
    android:layout_alignLeft="@+id/TextView02" 
    android:text="46.50" 
    android:textColor="#343438" 
    android:textAppearance="?android:attr/textAppearanceSmall" /> 

<TextView 
    android:id="@+id/qty" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBaseline="@+id/cost" 
    android:layout_alignBottom="@+id/cost" 
    android:layout_alignLeft="@+id/TextView01" 
    android:layout_marginLeft="22dp" 
    android:text="3" 
    android:textAppearance="?android:attr/textAppearanceSmall" 
    android:textColor="#343438" /> 

<TextView 
    android:id="@+id/textView1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/title" 
    android:layout_marginLeft="30dp" 
    android:text="Cost" 
    android:textAppearance="?android:attr/textAppearanceSmall" 
    android:textColor="#343434" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/TextView01" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_above="@+id/cost" 
    android:layout_centerHorizontal="true" 
    android:text="Quantity" 
    android:textAppearance="?android:attr/textAppearanceSmall" 
    android:textColor="#343434" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/title" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:text="Item Name 1" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:textColor="#a60704" /> 

<TextView 
    android:id="@+id/TextView02" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentRight="true" 
    android:layout_below="@+id/title" 
    android:layout_marginRight="30dp" 
    android:text="Total" 
    android:textAppearance="?android:attr/textAppearanceSmall" 
    android:textColor="#343434" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/cost" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignLeft="@+id/textView1" 
    android:layout_below="@+id/textView1" 
    android:text="15.50" 
    android:textAppearance="?android:attr/textAppearanceSmall" 
    android:textColor="#343438" /> 

<ImageButton 
    android:id="@+id/mImgBtnDelete" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignLeft="@+id/TextView01" 
    android:layout_below="@+id/qty" 
    android:focusable="false" 
    android:background="@drawable/remove_btn" /> 

    </RelativeLayout> 

注：我允許用戶在輸入他們願意數量Items.java

Constants.java ::

public class Constants { 
public static ArrayList<HashMap<String, String>> mItem_Detail = new ArrayList<HashMap<String, String>>(); 
    } 

Answer 1

intent.putExtra("test", mItem_Detail); me thod第一個參數是值的名稱，後面是對象。

Answer 2

更改如下你的方法：

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); 
     vi.setClickable(true); 
     vi.setFocusable(true); 
     vi.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      HashMap<String, String> item= mItem_Detail.get(position); 
      item.put(KEY_TO_BE_CHANGED, newValue); 
      mItem_Detail.set(position, item); 
      notifyDataSetInvalidated(); 

     } 
    });