Question

此代码的目标：

我有一个包含3个EditTexts的片段布局：

多行说明
小数
约会。

我希望用户使用软件键盘输入此信息，然后Fragment将newItem（记录）返回给父Activity，以便将其存储在db中。

我使用Listener采取正确的方法吗？

onEditorActionListener似乎比onKeyListener更灵活。
Eclipse真的不满意这条线：

descriptionEditText.setOnEditorActionListener(this);

抱怨setOnEditorActionListener不适用于参数。

我假设这意味着我在这里遇到了问题：

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这一点，我确信这很糟糕。

以下完整代码。

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;
    }


}

Answer 1

问题是，您定义的接口OnEditorActionListener与TextView.OnEditorActionListener的名称相同。如果你想使用第二个，那么你应该在它之前明确地写出TextView前缀。

例如：

public class AddNewItemTextFragment extends Fragment implements TextView.OnEditorActionListener

...有了这个，下一个代码就可以了：

descriptionEditText.setOnEditorActionListener(this);

......或者这个：

 descriptionEditText.setOnEditorActionListener (new TextView.OnEditorActionListener() {

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

Answer 2

让我建议另一种方法。

在Fragment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);
}

你的片段类：

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;
    }

}

在活动中实施接口。单击addNewItem按钮时，将在活动中调用方法onNewItemAdded。

监听器实现：单个片段中的3个EditTexts

2 个答案: