Android - 使用自定义 ArrayAdapter 获取 ListView 的每个 EditTexts 值

Question

我有一个带有客户 ArrayAdapter 和自定义 ListItem-XML 的 ListView。在这个 ListView 的底部，我添加了一个带按钮的 FooterView。现在我想在单击此按钮时获取每​​个 ListItems 中三个 EditTexts 的所有值。

下面是我的代码：

activity_checklistresult.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="match_parent">

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

result_inner_view.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/item_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:gravity="center">

    <TextView
        android:id="@+id/tv_result_amount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/default_margin" />
    <EditText
        android:id="@+id/et_result_amount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/default_margin"
        android:inputType="number" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center_vertical"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_result_product_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:ellipsize="end"
            android:layout_margin="@dimen/default_margin" />
        <AutoCompleteTextView
            android:id="@+id/actv_search_product"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:singleLine="true"
            android:ellipsize="end"
            android:layout_margin="@dimen/default_margin"
            android:inputType="textAutoComplete" />

    </LinearLayout>

    <TextView
        android:id="@+id/tv_result_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/default_margin" />
    <EditText
        android:id="@+id/et_result_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/default_margin"
        android:inputType="numberDecimal" />

</LinearLayout>

ResultListActivity.java：

public class ChecklistResultActivity extends ListActivity
{
    private MyResultAdapter adapt;
    private Button confirmButton;
    private ChecklistResultActivity rActivity;

    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_checklistresult);

        // Set my Custom ArrayAdapter for this ListActivity
        setAdapter();

        rActivity = this;
    }

    private void setAdapter(){
        adapt = new MyResultAdapter(this, R.layout.result_inner_view, Controller.getInstance().getOrderedProducts());
        setListAdapter(adapt);

        // Add the confirm button at the end of the list
        addFooterConfirmButton();
    }

    private void addFooterConfirmButton(){
        ListView lv = (ListView)findViewById(android.R.id.list);
        FrameLayout footerLayout = (FrameLayout) getLayoutInflater().inflate(R.layout.result_footer_view, null);
        confirmButton = (Button)footerLayout.findViewById(R.id.confirm_result_button);
        confirmButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ...

                // Get all EditText values (and compare them with the Default Value)
            }
        });
        lv.addFooterView(footerLayout);
    }

    ...

MyResultAdapter.java：

public class MyResultAdapter extends ArrayAdapter<OrderedProduct>
{
    private Context context;
    private int layoutResourceId;
    private LayoutInflater inflater;

    public MyResultAdapter(Context c, int layoutResourceId, List<OrderedProduct> objects){
        super(c, layoutResourceId, objects);
        this.layoutResourceId = layoutResourceId;
        this.context = c;
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        View view = convertView;
        if(view == null)
            view = inflater.inflate(layoutResourceId, parent, false);

        ...

        return view;
    }
}

在// Get all EditText values (and compare them with the Default Value) 的ResultListActivity 中，我想遍历所有OrderedProducts 并将它们的默认值与两个EditTexts 和AutoCompleteTextView 的新填充值进行比较。那么如何从 Footer-Button 的 onClick 中获取这些值呢？

提前感谢您的回复。

Answer 1

您的适配器必须为每个创建的 EditText 保存更改文本：

1. 创建地图以保存值
2. 为每个 EditText 定义并设置一个通用的 TextWatcher
3. 在editText上设置一个标签（使用它的位置或任何 id）我们将使用这个标签作为 hashMap 中的键
4. 创建一个方法来检索给定EditText 的值

适配器：

public class MyResultAdapter extends ArrayAdapter<OrderedProduct>
{
    ...

    private HashMap<String, String> textValues = new HashMap<String, String>();

    ...

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

        View view = convertView;
        boolean convertViewWasNull = false;
        if(view == null){
            view = inflater.inflate(layoutResourceId, parent, false);
            convertViewWasNull = true;
        }


        myEditText1 = findViewById...
        myEditText2 = findViewById...

        if(convertViewWasNull ){

            //be aware that you shouldn't do this for each call on getView, just once by listItem when convertView is null
            myEditText1.addTextChangedListener(new GenericTextWatcher(myEditText1));
            myEditText2.addTextChangedListener(new GenericTextWatcher(myEditText2));
        }

        //whereas, this should be called on each getView call, to update view tags.
        myEditText1.setTag("theFirstEditTextAtPos:"+position);
        myEditText2.setTag("theSecondEditTextAtPos:"+position);
    }


    private class GenericTextWatcher implements TextWatcher{

       private View view;
       private GenericTextWatcher(View view) {
            this.view = view;
        }

        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {}

        public void afterTextChanged(Editable editable) {

            String text = editable.toString();
            //save the value for the given tag :
            MyResultAdapter.this.textValues.put(view.getTag(), editable.toString());
        }
    }

    //you can implement a method like this one for each EditText with the list position as parameter :
    public String getValueFromFirstEditText(int position){
          //here you need to recreate the id for the first editText
         String result = textValues.get("theFirstEditTextAtPos:"+position);
         if(result ==null)
              result = "default value";

         return result;
    }

    public String getValueFromSecondEditText(int position){
          //here you need to recreate the id for the second editText
         String result = textValues.get("theSecondEditTextAtPos:"+position);
         if(result ==null)
              result = "default value";

         return result;
    }

}

Answer 2

你可以存储所有edittext的值并在需要的时候获取，你可以存储在afterTextChange或者onTextChange中，由你决定。

public class MyResultAdapter extends ArrayAdapter<OrderedProduct>{
    ...

    private final String[] valueList;

    public MyResultAdapter(Context c, int layoutResourceId, List<OrderedProduct> objects){
        super(c, layoutResourceId, objects);

        ...

        valueList = new String[objects.size()];

    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        View view = convertView;
        if(view == null)
            view = inflater.inflate(layoutResourceId, parent, false);

        ...

        //for edittext add text watcher listener

        final pos = position;

        editText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                 valueList[pos] = s.toString();
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

        return view;
    }

    public String[] getValueList(){
        return valueList;
    }
}