如果设置 STYLE_NO_TITLE，带有 AppCompatDialog 的 DialogFragment 会崩溃

Question

我正在尝试在 AppCompat v22.1 中使用带有片段的新 material 主题对话框。 According to Chris Banes，要做到这一点：

Just return new AppCompatDialog(getActivity(), getTheme()) from onCreateDialog(Bundle).

正在设置：

public class MyFragment extends DialogFragment
{
    public MyFragment() { }

    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AppCompatDialog(getActivity(), getTheme());
    }

    ...
}

正常情况下完美运行；该对话框的主题和一切都正确。但是，当我们尝试显示带有 STYLE_NO_TITLE 选项的对话框时：

 MyFragment fragment = new MyFragment();
 fragment.setStyle(DialogFragment.STYLE_NO_TITLE, 0);
 fragment.show(getSupportFragmentManager(), "DIALOG");

它导致以下异常和崩溃：

05-19 12:18:38.806  15458-15458/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.test.testdialog, PID: 15458
android.util.AndroidRuntimeException: requestFeature() must be called before adding content
    at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:302)
    at android.app.Dialog.requestWindowFeature(Dialog.java:1066)
    at android.support.v4.app.DialogFragment.getLayoutInflater(DialogFragment.java:317)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
    at android.support.v4.app.FragmentManagerImpl.run(FragmentManager.java:458)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

我猜问题可能与 DialogFragment 调用 requestWindowFeature() 而不是 supportRequestWindowFeature() (?)

有关

这个问题有什么解决方法吗？

Answer 1

根据 Blackbelt link 的问题，我们应该 return AppCompatDialog 并使用 supportRequestWindowFeature()。我建议这样更改：

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AppCompatDialog dialog = new AppCompatDialog(getActivity(), getTheme());
    return dialog;
}

@Override
public void setupDialog(Dialog dialog, int style) {
    switch (style) {
        case STYLE_NO_INPUT:
            dialog.getWindow().addFlags(
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |
                            WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
            // fall through...
        case STYLE_NO_FRAME:
        case STYLE_NO_TITLE:
            ((AppCompatDialog) dialog).supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
    }
}

或更好，尽量不要触摸原始代码：

@Override
public void setupDialog(Dialog dialog, int style) {
    super.setupDialog(dialog,style);
    if(style == STYLE_NO_TITLE) 
         ((AppCompatDialog) dialog).supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
}

Answer 2

这是 fixed in v22.1.1.

AppCompat v22.1 中的错误

它在 v23 和 was fixed once more, in v23.0.1 中再次崩溃。

在撰写本文时它工作正常。

如果设置 STYLE_NO_TITLE，带有 AppCompatDialog 的 DialogFragment 会崩溃

DialogFragment with AppCompatDialog crashes if STYLE_NO_TITLE is set

android

android-support-library

android-dialogfragment

android-appcompat