Question

我在自定义适配器中有一个arrayList，包含一些字符串和复选框。并且我想在某些条件下自动设置复选框，但是如何设置代码以便自动选中复选框。

public LazyAdapter(Activity a, ArrayList<HashMap<String, String>> d) {
    activity = a;
    data = d;
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public View getView(int position, View convertView, ViewGroup parent) {

    View vi = convertView;

    if(convertView == null) 
        vi = inflater.inflate(R.layout.list_row, null);

    TextView no = (TextView)vi.findViewById(R.id.txt_no);
    TextView code = (TextView)vi.findViewById(R.id.txt_code);
    TextView name = (TextView)vi.findViewById(R.id.txt_asset);
    TextView dept = (TextView)vi.findViewById(R.id.txt_dept);
    CheckBox status = (CheckBox)vi.findViewById(R.id.cb_stat);

    HashMap<String, String> asset = new HashMap<String, String>();
    asset = data.get(position); 
    //Setting all values in listview
    no.setText(asset.get(ListLocationActivity.KEY_NO));
    code.setText(asset.get(ListLocationActivity.KEY_CODE));
    name.setText(asset.get(ListLocationActivity.KEY_NAME));
    dept.setText(asset.get(ListLocationActivity.KEY_DEPT));
    return vi;
}

当我得到结果时，这是我的条件，我想设置选中结果与arraylist中的代码相适应的复选框

for (int i = 0; i < assetList.size(); i++) {
            if (assetList.get(i).get(KEY_CODE).equals(scanAsset)){
                //set checked in certain list asset
               //(Here i confused how i can set the checkbox in list suitable with the code asset)
                Log.i("Asset code is ", scanAsset);
            }
        }

此代码在复选框中没有设置值时工作正常，任何人都可以帮我解决这个问题。。。。谢谢你

Answer 1

我建议使用实际的对象而不是HashMap，但这超出了这个问题的范围

我会调整您的getView来回添加此行，然后再返回

status.setChecked(asset.containsKey(ListLocationActivity.KEY_CHECKED));

显然创建了一个新的静态密钥，用于检查，不确定定义的位置

然后一旦得到你的扫描结果，你就引用了上面这个，所以我会修改它：

for (int i = 0; i < assetList.size(); i++) {
    HashMap<String, String> asset = assetList.get(i);
    if (asset.get(KEY_CODE).equals(scanAsset)){
        asset.put(KEY_CHECKED, "Checked");
        Log.i("Asset code is ", scanAsset);
    }
}
adapter.notifyDataSetChanged();

所以我们所做的是我们为你的适配器创建了一个新的属性来关闭，然后如果你正在构建适配器中的视图的资产有那个键，那么我们要检查复选框，否则我们想要不检查它。

Answer 2

创建一个模型对象（此处称为AssetsWrapper）并在其中设置一个布尔值。

// Model wrapper class
class AssetsWrapper {
    HashMap<String, String> mAssets;
    boolean mBoolean;
}


// Your code that checks the CheckBox
for (int i = 0; i < assetList.size(); i++) {
    if (assetList.get(i).get(KEY_CODE).equals(scanAsset)){
        assetList.get(i).mBoolean = true;
    }
    adapter.notifyDataSetChanged();
}

// YOUR ADAPTER CODE --------------------------------------------

// Constructor (notice that the ArrayList has changed)
public LazyAdapter(Activity a, ArrayList<AssetsWrapper> d) {
    activity = a;
    data = d;
    inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}


public View getView(int position, View convertView, ViewGroup parent) {

    // ...

    CheckBox status = (CheckBox)vi.findViewById(R.id.cb_stat);

    AssetsWrapper aw = getItem(position);

    // Here, the adapter reads the value from the model object.
    status.setChecked(aw.mBoolean);

    // ...

    return vi;
}

如何在特定条件下检查arrayList中的复选框？

2 个答案: