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如果此問題已得到解答，但是我一直在四處尋找過去兩天的不同事情，並且無法修復我的代碼。無法從對話框片段中調用父級片段方法
我正在創建一個帶有單選按鈕（單選按鈕）的AlertDialog。我的對話標題和文本是根據用戶從父母FragmentActivity中點擊的按鈕動態創建的。然後，如果用戶點擊肯定按鈕（在我的情況下，保存），我希望將與他的選擇對應的字符串傳回給父項FragmentActivity，以顯示在相應的TextView中。
這是我DialogFragment代碼：
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;
}
}
我已經表明我認爲不與評論//==> THIS DOESN'T SEEM TO BE WORKING <==工作。 這是我父FragmentActivity代碼：
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();
}
}
當我按下SAVE按鈕，敬酒的消息顯示細膩，然後對話框關閉，但是，我認爲，該方法onDialogPositiveClick不被稱爲父FragmentActivity ，因爲TextViews從不改變。我認爲這將由clickListener管理。
改變這個'TextView的電視=新的TextView。 （this）;'to'TextView tv' – Raghunandan
'dialogSubject ==「fruit」'不起作用，這不是你在Java中比較字符串的方式，2秒的調試會告訴你這樣的結果 – njzk2
@Raghunandan：雖然我同意這個實例是無用的，刪除它不會解決任何問題。 – njzk2