Question

我正在尝试从选择弹出菜单项后弹出的对话框中获取输入。我不太明白如何获取用户的文本输入，以便我可以将其设置为我的TextView“ListName”（参见最后一个方法）。我得到的文字是： android.widget.EditText@41f3abf8

MainActivity.java：

package com.example.groceryrunner;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.PopupMenu;
import android.widget.TextView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    // Method for activity events
    public void onButtonClick(View v) {
        final int id = v.getId();
        switch (id) {
        case R.id.CreateLG:
            createLGPopup(v);
            break;
        case R.id.EditButton:
            findViewById(R.id.GetStarted).setVisibility(View.INVISIBLE);
            createEditButtonPopup(v);
            break;
        }
    }
    // findViewById(R.id.GetStarted).setVisibility(View.INVISIBLE);
    // TextView text = (TextView) findViewById(R.id.GetStarted);
    // text.setText(choice);

    // CreateLG Button's Popup Menu
    public void createLGPopup(View v) {
        PopupMenu LGMenu = new PopupMenu(this, v);
        LGMenu.getMenuInflater().inflate(R.menu.createlg_menu, LGMenu.getMenu());
        LGMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {

            @Override
            public boolean onMenuItemClick(MenuItem item) {
                String choice = new String((String) item.getTitle());
                if (choice.equals("Create List")) {
                    createListDialog();
                }
                else if (choice.equals("Create Group")) {
                    findViewById(R.id.GetStarted).setVisibility(View.INVISIBLE);
                    //createListDialog();
                }
                return false;
            }
        });
        LGMenu.show();
    }

    // Create Edit Button's Popup Menu
    public void createEditButtonPopup(View v) {
        PopupMenu EditMenu = new PopupMenu(this, v);
        EditMenu.getMenuInflater().inflate(R.menu.editlist_menu, EditMenu.getMenu());
        EditMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {

            @Override
            public boolean onMenuItemClick(MenuItem item) {
                String choice = new String((String) item.getTitle());
                if (choice.equals("Edit List Name")) {
                    findViewById(R.id.GetStarted).setVisibility(View.INVISIBLE);
                    //createListDialog();
                }
                else if (choice.equals("Clear List Items")) {
                    findViewById(R.id.GetStarted).setVisibility(View.VISIBLE);
                    //createListDialog();
                }
                else if (choice.equals("Delete List Name")) {
                    findViewById(R.id.GetStarted).setVisibility(View.INVISIBLE);
                    //createListDialog();
                }
                return false;
            }
        });
        EditMenu.show();
    }

    // Create List Dialog
    public AlertDialog.Builder dialogBuilder;
    private void createListDialog() {
        dialogBuilder = new AlertDialog.Builder(this);
        final EditText textInput = new EditText(this);      
        dialogBuilder.setTitle("Create list");
        dialogBuilder.setMessage("Name your list: ");
        dialogBuilder.setView(textInput);
        dialogBuilder.setPositiveButton("Create", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                TextView text = (TextView) findViewById(R.id.ListName);
                text.setText(textInput.toString());
                //TextView text = (TextView) findViewById(R.id.ListName);
                //String input = textInput.getText().toString(); //(textInput.toString());
                //Toast.makeText(getApplicationContent(), "List has been created.", toast.LENGTH_SHORT);
                // add list to ListsButton
                //findViewById(R.id.ListName). -> Change ListName text to created list
            }
        });
        dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                //Toast.makeText(getApplicationContent(), "List has been created.", toast.LENGTH_SHORT);
            }
        });
        // Output
        AlertDialog dialogue = dialogBuilder.create();
        dialogue.show();

    }
}

Answer 1

根据评论中讨论的内容，您应该能够像这样：

@Override
public void onClick(DialogInterface dialog, int which) {
    TextView text = (TextView) findViewById(R.id.ListName);
    text.setText(textInput.getText().toString());
    // ...

从对话框回调中检索活动中引用的视图（此处为ListName），findViewById()，因为对话框被定义为活动的嵌套类，因此findViewById()已转换为MainActivity.this.findViewById()，因此应该ListName很好。它还必须被强制转换为使用特定于TextView类的方法。
如果您撰写textInput.toString()，则会调用toString()对象的TextView方法。看起来TextView不会覆盖toString()，所以这是默认的Object#toString()方法，它只返回对象类型的名称加上其哈希码（这就是为什么你看到{ {1}}）。您需要先从视图中获取android.widget.EditText@41f3abf8（CharacterSequence）。

Answer 2

调用findViewById时必须使用对话框的上下文。像这个dialog.findViewById（R.id.ListName），而不仅仅是findViewById（R.id.ListName）。出于这个原因，该对话框作为参数传递给onClick（）方法。

Answer 3

在onClick中添加此内容：text.setText(input);

如何获得对话框输入？

3 个答案: