打開對話框並在textview中顯示arraylist

Question

好吧，一個簡單的問題：我在主要活動中有一個數組列表。當用戶點擊一個按鈕時，我打開一個對話框，用戶可以輸入姓名，電話號碼和電子郵件地址，當他們點擊對話按鈕「添加聯繫人」時，他們的輸入存儲在上述的數組列表中。我如何讓它顯示在第二個對話框中（即在文本視圖中等）？

我的代碼爲MainActivity.java： package com.example.java2midterm_lefelhocz;

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AddContactsDialog： 包com.example.java2midterm_lefelhocz;

import android.app.DialogFragment; 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.widget.*; 

public class AddContactDialog extends DialogFragment { 
private EditText txtName; 
private EditText txtPhone; 
    private EditText txtEmail; 
private LayoutInflater inflater; 

public AlertDialog onCreateDialog(Bundle savedInstanceState){ 

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 

    inflater = getActivity().getLayoutInflater(); 

    builder.setView(inflater.inflate(R.layout.add_contacts, null)); 
    builder.setTitle("Add A Contact"); 
    builder.setPositiveButton("AddContact", new  DialogInterface.OnClickListener() { 

     @Override 
     public void onClick(DialogInterface dialog, int which) { 
      MainActivity ma = (MainActivity)getActivity(); 
      txtName = (EditText)AddContactDialog.this.getDialog().findViewById(R.id.txtName); 
      txtPhone =  (EditText)AddContactDialog.this.getDialog().findViewById(R.id.txtPhone); 
      txtEmail =  (EditText)AddContactDialog.this.getDialog().findViewById(R.id.txtEmail); 
      ma.contacts.add(txtName.getText().toString()); 
      ma.contacts.add(txtPhone.getText().toString()); 
      ma.contacts.add(txtEmail.getText().toString()); 

     } 
    }); 
    return builder.create(); 
} 

} 

最後，ViewContacts.java：

包com.example.java2midterm_lefelhocz;

import android.app.DialogFragment; 
import android.app.AlertDialog; 

import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.widget.*; 

public class ViewContacts extends DialogFragment { 

private TextView txtContacts; 
private LayoutInflater inflater; 
public AlertDialog onCreateDialog(Bundle savedInstanceState) 
{ 

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());  


    inflater = getActivity().getLayoutInflater();  


    builder.setView(inflater.inflate(R.layout.view_contacts, null)); 
    builder.setTitle("Contacts"); 




    return builder.create(); 
} 
} 

Answer 1

您可以在一個Bundle通過contacts有：

newFragment.setArguments(bundle); 

然後在你的片段閱讀。或者，您可以像讀取AddContactsDialog中的靜態變量一樣閱讀contacts。使用public變量很方便，但通常認爲是不安全的，首選的方法是使用getters/setter和其他間接傳遞數據的方式（如在Bundle中）。

可以顯示在對話框這些接觸在許多方面最基本的就是setItems()：

OnClickListener dialogClickListener = new DialogInterface.OnClickListener() { 
    @Override 
    public void onClick(DialogInterface dialog, int which) { 
     Log.v("Dialog List", "You clicked item " + which); 
    } 
}; 

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());  
builder.setTitle("Contacts"); 
builder.setItems(MainActivity.contacts, dialogClickListener); 
return builder.create();