Android 侦听器实现：单个片段中包含3个EditText

本准则的目标：

我有一个包含3个编辑文本的片段布局：

• 多行描述
• 小数
• 约会

我希望用户使用软件键盘输入此信息，然后片段将一个新项目（记录）返回给父活动，以便将其存储在数据库中

我是否采用了正确的方法来使用侦听器

onEditorActionListener

似乎比

onKeyListener

更灵活

Eclipse对这句话真的很不满意：

descriptionEditText.setOnEditorActionListener（此）

抱怨
setOnEditorActionListener
不适用于参数

我假设这意味着我有一个问题：

public interface OnEditorActionListener {
    public void onNewItemAdded(String[] newItem);
    // need to change this newItem?
}  

欢迎任何其他评论，因为这是我第一次尝试，我相信这很糟糕

下面的完整代码。

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.TextView;

public class AddNewItemTextFragment extends Fragment {

    // A Fragment event callback interface, pg 126 Meier; used to share info with host Activity
    // Host activity listens for a new item to be created

    public interface OnEditorActionListener {
        public void onNewItemAdded(String[] newItem);
        // need to change this newItem?
    }

    // Create a variable to store a reference to the parent Activity that will implement the interface.

    private OnEditorActionListener onEditorActionListener;  

    // This reference can be retrieved as soon as the parent has been bound to the Fragment with the Fragment's onAttach handler.

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            onEditorActionListener = (OnEditorActionListener)activity;
        } catch (ClassCastException e) {
          throw new ClassCastException(activity.toString() + "must implement OnEditorActionListener");
        }
    }

    // The Listener implementation

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstaceState) {
        View view = inflater.inflate(R.layout.add_new_item_text_fragment , container, false);

        final EditText descriptionEditText = (EditText)view.findViewById(R.id.description);
        descriptionEditText.setOnEditorActionListener(this);
        final EditText amountEditText = (EditText)view.findViewById(R.id.amount);
        amountEditText.setOnEditorActionListener(this);
        final EditText dateEditText = (EditText)view.findViewById(R.id.date1);
        dateEditText.setOnEditorActionListener(this);
        // add category, sub category Spinner


        // need to add newItem as a parameter?      
        descriptionEditText.setOnEditorActionListener (new OnEditorActionListener() {

            public boolean onEditorAction (TextView v, int actionId, KeyEvent event) {
                boolean handled = false;

                    if (actionId == EditorInfo.IME_ACTION_SEND) {
                        String newDescription = descriptionEditText.getText().toString();
                        String newAmount = amountEditText.getText().toString();
                        String newDate = dateEditText.getText().toString();
                        // add other fields here; create array newItem containing all fields
                        String [] newItem ={newDescription, newAmount, newDate};

                        onEditorActionListener.onNewItemAdded(newItem);
                        handled = true;
                    }
                return handled;  

            }


        });
        return view;
    }


}

---

让我提出另一种方法

在片段布局中添加一个按钮。
将其命名为addNewItem

（“@+id/addNewItem”）

此按钮允许用户添加新项目

声明活动必须实现的接口：

public interface OnAddNewItemListener {
    public void onNewItemAdded(String[] newItem);
}  

您的片段类：

public class AddNewItemTextFragment extends Fragment {

    // A Fragment event callback interface, pg 126 Meier; used to share info with host Activity
    // Host activity listens for a new item to be created

    public interface OnAddNewItemListener {
        public void onNewItemAdded(String[] newItem);
    }

    // Create a variable to store a reference to the parent Activity that will implement the interface.

    private OnAddNewItemListener onAddNewItemListener;  

    // This reference can be retrieved as soon as the parent has been bound to the Fragment with the Fragment's onAttach handler.

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            onAddNewItemListener = (OnAddNewItemListener)activity;
        } catch (ClassCastException e) {
          throw new ClassCastException(activity.toString() + "must implement OnEditorActionListener");
        }
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.add_new_item_text_fragment , container, false);

        final EditText descriptionEditText = (EditText)view.findViewById(R.id.description);
        final EditText amountEditText = (EditText)view.findViewById(R.id.amount);
        final EditText dateEditText = (EditText)view.findViewById(R.id.date1);
        final Button addNewItemButton = (Button)view.findViewById(R.id.addNewItem);    

        // onClickListener for button
        addNewItemButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

            // need to add newItem as a parameter?
            String newDescription = descriptionEditText.getText().toString();
            String newAmount = amountEditText.getText().toString();
            String newDate = dateEditText.getText().toString();

           // add other fields here; create array newItem containing all fields
            String [] newItem ={newDescription, newAmount, newDate};

            // call method on Interface(activity)
            onAddNewItemListener.onNewItemAdded(newItem);
           }
        });

        return view;
    }

}  

在活动中实现接口。

---

单击addNewItem按钮时，将在“活动”中调用方法

onNewItemAdded

。

问题在于，您使用与TextView.OnEditorActionListener相同的名称定义接口OnEditorActionListener。如果要使用第二个，则应在其前面显式写入TextView前缀

例如：

public class AddNewItemTextFragment extends Fragment implements TextView.OnEditorActionListener

…有了这个，下一个代码将起作用：

descriptionEditText.setOnEditorActionListener(this);

……或者：

 descriptionEditText.setOnEditorActionListener (new TextView.OnEditorActionListener() {

            public boolean onEditorAction (TextView v, int actionId, KeyEvent event) {
...

---

谢谢，这绝对是一个有用的评论。我还没有试过，但是EditView.OnEditorActionListener应该和TextView一样工作，否？是的，EditText扩展了TextView，因此OnEditorActionListener是相同的。太好了，在阅读了您所有的更改后，我喜欢它们：为了总结，您重命名了界面（谢谢），并且添加的按钮可以“返回”整条记录，避免了需要多个侦听器（也感谢整理了我最初提交的内容）