是否可以创建DialogFragment并更改默认容器？
我尝试了DialogFragment.show(Transaction, ...)并在那里设置了容器，然后它告诉我Fragment already added。
DialogFragment的行为与普通的DialogFragment类似，这一点非常重要。
编辑：我认为存在一些误解。我说它应该看起来像正常的DialogFragment＆＃34;。我的意思是它看起来应该像普通的AlertDialog。
答案 0 :(得分：1)
我认为，由于DialogFragment来自Fragment，因此您可以在需要时将其用作普通Fragment。它仍应实现所有Fragment生命周期方法。但是，我不确定它是否因特殊目的而覆盖了它们中的任何一个。
答案 1 :(得分：1)
你可以像使用普通片段一样使用dialogFragment。从样本中查看此代码。 在此代码中，它创建一个dialogFragment并将其添加到framlayout，并在按下按钮时将其显示为对话框。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:padding="4dip"
android:gravity="center_horizontal"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:layout_gravity="center_vertical|center_horizontal"
android:gravity="top|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Demonstrates the same fragment
being shown as a dialog and embedded inside of an activity." />
<Button android:id="@+id/show_dialog"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_weight="0"
android:text="show">
<requestFocus />
</Button>
<View android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView
android:id="@+id/inline_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:layout_gravity="center_vertical|center_horizontal"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Fragment embedded inside
of the activity:" />
<FrameLayout
android:id="@+id/embedded"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:layout_gravity="center_vertical|center_horizontal"
android:padding="6dp"
android:background="#ff303030"
android:gravity="top|center_horizontal" />
</LinearLayout>
和java代码：
public class FragmentDialogOrActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_dialog_or_activity);
if (savedInstanceState == null) {
// First-time init; create fragment to embed in activity.
FragmentTransaction ft = getFragmentManager().beginTransaction();
DialogFragment newFragment = MyDialogFragment.newInstance();
ft.add(R.id.embedded, newFragment);
ft.commit();
}
// Watch for button clicks.
Button button = (Button)findViewById(R.id.show_dialog);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
showDialog();
}
});
}
void showDialog() {
// Create the fragment and show it as a dialog.
DialogFragment newFragment = MyDialogFragment.newInstance();
newFragment.show(getFragmentManager(), "dialog");
}
public static class MyDialogFragment extends DialogFragment {
static MyDialogFragment newInstance() {
return new MyDialogFragment();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.hello_world, container, false);
View tv = v.findViewById(R.id.text);
((TextView)tv).setText("This is an instance of MyDialogFragment");
return v;
}
}
}
您的错误可以使用以下代码：
public static void showMyDialogFragment(FragmentManager fm){
FragmentTransaction ft = fm.beginTransaction();
Fragment prev = fm.findFragmentByTag("MyDialogFragment");
if (prev != null) {
ft.remove(prev);
}
ft.addToBackStack(null);
DialogFragment newFragment = MyDialogFragment.newInstance();
newFragment.show(ft, "MyDialogFragment");
}
正如您所注意到的，我更改了标记名称，以便您可以区分对话框片段和添加到布局中的普通片段。
答案 2 :(得分：0)
public static class MyDialogFragment extends DialogFragment {
int mNum;
/**
* Create a new instance of MyDialogFragment, providing "num"
* as an argument.
*/
static MyDialogFragment newInstance(int num) {
MyDialogFragment f = new MyDialogFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments().getInt("num");
// Pick a style based on the num.
int style = DialogFragment.STYLE_NORMAL, theme = 0;
switch ((mNum-1)%6) {
case 1: style = DialogFragment.STYLE_NO_TITLE; break;
case 2: style = DialogFragment.STYLE_NO_FRAME; break;
case 3: style = DialogFragment.STYLE_NO_INPUT; break;
case 4: style = DialogFragment.STYLE_NORMAL; break;
case 5: style = DialogFragment.STYLE_NORMAL; break;
case 6: style = DialogFragment.STYLE_NO_TITLE; break;
case 7: style = DialogFragment.STYLE_NO_FRAME; break;
case 8: style = DialogFragment.STYLE_NORMAL; break;
}
switch ((mNum-1)%6) {
case 4: theme = android.R.style.Theme_Holo; break;
case 5: theme = android.R.style.Theme_Holo_Light_Dialog; break;
case 6: theme = android.R.style.Theme_Holo_Light; break;
case 7: theme = android.R.style.Theme_Holo_Light_Panel; break;
case 8: theme = android.R.style.Theme_Holo_Light; break;
}
setStyle(style, theme);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// put here any view you want
View v = inflater.inflate(R.layout.fragment_dialog, container, false);
View tv = v.findViewById(R.id.text);
((TextView)tv).setText("Dialog #" + mNum + ": using style "
+ getNameForNum(mNum));
// Watch for button clicks.
Button button = (Button)v.findViewById(R.id.show);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// When button is clicked, call up to owning activity.
((FragmentDialog)getActivity()).showDialog();
}
});
return v;
}
}
void showDialog() {
mStackLevel++;
// DialogFragment.show() will take care of adding the fragment
// in a transaction. We also want to remove any currently showing
// dialog, so make our own transaction and take care of that here.
FragmentTransaction ft = getFragmentManager().beginTransaction();
// may you got error here
Fragment prev = getFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
// remove fragment from stack will fix the problem
ft.remove(prev);
}
ft.addToBackStack(null);
// Create and show the dialog.
DialogFragment newFragment = MyDialogFragment.newInstance(mStackLevel);
newFragment.show(ft, "dialog");
}
如果你想在警报按钮中使用它，那么代码是
public static class MyAlertDialogFragment extends DialogFragment {
public static MyAlertDialogFragment newInstance(int title) {
MyAlertDialogFragment frag = new MyAlertDialogFragment();
Bundle args = new Bundle();
args.putInt("title", title);
frag.setArguments(args);
return frag;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
int title = getArguments().getInt("title");
return new AlertDialog.Builder(getActivity())
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(title)
.setPositiveButton(R.string.alert_dialog_ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doPositiveClick();
}
}
)
.setNegativeButton(R.string.alert_dialog_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doNegativeClick();
}
}
)
.create();
}
}