如果这个问题得到了回答，请道歉，但过去两天我一直在寻找不同的事情，并且无法修复我的代码。
我正在创建一个AlertDialog单选（单选按钮）。我的对话框标题和文本是根据用户从父FragmentActivity点击的按钮动态创建的。然后，如果用户单击肯定按钮（在我的情况下，保存），我希望将与其选择对应的字符串传递回父FragmentActivity，以显示在相应的{ {1}}。
这是我的TextView代码：
DialogFragment我已经表明了我认为不符合评论的package com.myDummyProject.FoodSelector;
import java.util.Arrays;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.widget.Toast;
public class DummyDialogFragment extends DialogFragment {
public interface selectChoiceDialogListener {
public void onDialogPositiveClick(DialogFragment dialog,String dialogSubject,CharSequence selectedChoice);
}
selectChoiceDialogListener clickListener;
public static CharSequence[] radioOptions;
public static CharSequence selectedChoice = new String();
public static String dialogSubject = new String();
public static String dialogTitle = new String();
public static CharSequence defaultChoice = new String();
public DummyDialogFragment(){
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Retrieve values from bundle
radioOptions = getArguments().getCharSequenceArray("DIALOG_radioOptions");
dialogSubject = getArguments().getString("CHOICE_TYPE");
dialogTitle = getArguments().getString("DIALOG_TITLE");
defaultChoice = getArguments().getString("DEFAULT_CHOICE");
int defaultValue = Arrays.asList(radioOptions).indexOf(defaultChoice);
selectedChoice = defaultChoice;
// Build the dialog
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(dialogTitle)
.setSingleChoiceItems(radioOptions, defaultValue, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
selectedChoice = radioOptions[which];
}
})
.setPositiveButton(R.string.action_save_allcaps, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Save selectedChoice; will be retrieved and showed in TextView of previous activity
// ==> THIS DOESN'T SEEM TO BE WORKING <==
clickListener.onDialogPositiveClick(DummyDialogFragment.this,dialogSubject,selectedChoice);
CustomDialogListener myParentFragment = (CustomDialogListener) getFragmentManager().findFragmentByTag("myParentFragmentTag"); // ERROR: "CustomDialogListener cannot be resolved to a type"
myParentFragment.refreshView();
// Toast informing user that choice was saved
CharSequence toastMessage = dialogSubject + " saved as " + selectedChoice;
Toast.makeText(getActivity(),toastMessage, Toast.LENGTH_SHORT).show();
// TODO: Return to previous activity -> make sure new values appear in the activity
}
})
.setNegativeButton(R.string.action_cancel_allcaps, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Toast informing user that choice was cancelled
CharSequence toastMessage = dialogSubject + " change was cancelled";
Toast.makeText(getActivity(),toastMessage, Toast.LENGTH_SHORT).show();
}
});
// Create the dialog
return builder.create();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
clickListener = (selectChoiceDialogListener) activity;
}
}
。
这是我的父FragmentActivity代码：
//==> THIS DOESN'T SEEM TO BE WORKING <==当我按下package com.myDummyProject.FoodSelector;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import android.annotation.TargetApi;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.content.Intent;
import android.os.Build;
import android.support.v4.app.FragmentActivity;
public class DummyParentFragment extends FragmentActivity implements DummyDialogFragment.selectChoiceDialogListener {
(...)
public void pickFruits (View view){
DialogFragment pickFoodsDialog = new DummyDialogFragment();
String dialogTitle = "Select a fruit:";
String dialogSubject = "Fruit";
CharSequence[] radioOptions = new CharSequence[]{"Apple","Banana","Strawberry"};
TextView tv_fruit = (TextView) findViewById(R.id.textView_tv_fruit);
CharSequence defaultFruit = tv_fruit.getText();
Bundle extras = new Bundle();
extras.putCharSequenceArray("DIALOG_radioOptions", radioOptions);
extras.putString("DIALOG_TITLE", dialogTitle);
extras.putString("DIALOG_SUBJECT", dialogSubject);
extras.putCharSequence("DEFAULT_CHOICE", defaultFruit);
pickFoodsDialog.setArguments(extras);
pickFoodsDialog.show(getSupportFragmentManager(),"pickFoodsDialog");
}
public void selectDessert(View view){
DialogFragment pickFoodsDialog = new DummyDialogFragment();
String dialogTitle = "Select a dessert:";
String dialogSubject = "Dessert";
CharSequence[] radioOptions = new CharSequence[]{"Cheescake","Chocolate Cake","Ice Cream","Creme Brulee"};
TextView tv_dessert = (TextView) findViewById(R.id.textView_day);
CharSequence defaultDayOfWeek = dayOfWeek.getText();
Bundle extras = new Bundle();
extras.putCharSequenceArray("DIALOG_radioOptions", radioOptions);
extras.putString("DIALOG_TITLE", dialogTitle);
extras.putString("DIALOG_SUBJECT", dialogSubject);
extras.putCharSequence("DEFAULT_CHOICE", defaultDayOfWeek);
pickFoodsDialog.setArguments(extras);
pickFoodsDialog.show(getSupportFragmentManager(),"pickFoodsDialog");
}
public void selectStarter (View view){
DialogFragment radioButtonsDialog = new DummyDialogFragment();
String dialogTitle = "Select a starter:";
String dialogSubject = "Starter";
CharSequence[] radioOptions = new CharSequence[]{"Soup of the day","Garlic Bread","Prawns with garlic sauce","Mussels in white wine"};
TextView reminder = (TextView) findViewById(R.id.textView_reminder);
CharSequence defaultReminder = reminder.getText();
Bundle extras = new Bundle();
extras.putCharSequenceArray("DIALOG_radioOptions", radioOptions);
extras.putString("DIALOG_TITLE", dialogTitle);
extras.putString("DIALOG_SUBJECT", dialogSubject);
extras.putCharSequence("DEFAULT_CHOICE", defaultReminder);
radioButtonsDialog.setArguments(extras);
radioButtonsDialog.show(getSupportFragmentManager(),"pickFoodsDialog");
}
public void onDialogPositiveClick(DialogFragment dialog, String dialogSubject, CharSequence selectedChoice) {
// User touched the dialog's positive button
TextView tv = new TextView(this);
if(dialogSubject.equals("Fruit")){
tv = (TextView)findViewById(R.id.textView_tv_fruit);
}else if (dialogSubject.equals("Dessert")){
tv = (TextView)findViewById(R.id.textView_dessert);
}else if (dialogSubject.equals("Starter")){
tv = (TextView)findViewById(R.id.textView_starter);
}
tv.setText(selectedChoice);
}
public void refreshView(){
FragmentManager mFragmentManager = new getFragmentManager(); // ERROR: "getFragmentManager cannot be resolved to a type"
Fragment currentFragment = getActivity().getFragmentManager().findFragmentByTag("myParentFragmentTag"); // ERROR: "The method getActivity() is undefined for the type AddModule"
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.detach(currentFragment);
fragmentTransaction.attach(currentFragment);
fragmentTransaction.commit();
}
}
按钮时，toast消息显示正常，然后对话框关闭，但我认为方法SAVE未在父onDialogPositiveClick中调用，因为FragmentActivity永远不会改变。我认为这将由TextViews管理。
答案 0 :(得分：0)
道歉...使用dialogSubject.equals("fruit")来比较字符串。
您的新内容未显示在父片段中的原因是该片段需要刷新。
只需将其添加到对话框的onClick方法（setPositiveButton）中
CustomDialogListener myParentFragment = (CustomDialogListener) getFragmentManager().findFragmentByTag("myParentFragmentTag");
myParentFragment.refreshView();
并在父片段中添加以下方法： （这将刷新你的父片段。它将删除并将片段添加到视图中 - 这就是全部。标签（myParentFragmentTag）是识别相应片段所必需的。
public void refreshView() {
Fragment currentFragment = getActivity().getFragmentManager().findFragmentByTag("myParentFragmentTag");
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.detach(currentFragment);
fragmentTransaction.attach(currentFragment);
fragmentTransaction.commit();
}
我猜你的MainActivity拥有你的父片段。 你会发现类似......的代码：
ParentFragment myParentFragment = new ParentFragment();
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.drawer_main_content_frame, myParentFragment, "myParentFragmentTag");
fragmentTransaction.commit();
关于这一点的重要部分是命名片段。这发生在replace（） - ＆gt; “” myParentFragmentTag”。
我希望我的答案现在更容易理解:) 如果你还在努力，请告诉我。