Question

我在activity中显示一个对话框片段，尝试使用show（）和add（）方法。代码如下：

HelpDialogFragment hdf = HelpDialogFragment.newInstance();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.add(hdf, "dialog");
ft.commit(); #crash here

我有时从上面的代码中得到IllegalStateException错误，崩溃日志在下面给出

java.lang.IllegalStateException: Activity has been destroyed
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1329)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:548)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:532)
at com.delight.activities.HomeActivity.showHelp(HomeActivity.java:311)

行号HomeActivity.java中的311是上面代码中提到的ft.commit()。我的活动从兼容性库（这是迄今为止的更新）扩展了FragmentActivity。如果我使用show()方法，则会发生同样的崩溃。

HelpDialogFragment hdf = HelpDialogFragment.newInstance();
hdf.show(getSupportFragmentManager(), "dialog");  #same crash here

所以我得出的结论是getSupportFragmentManager()给我带来了问题，我不明白的是，在代码的哪一部分，我使用的是被破坏的活动，就我而言了解getSupportFragmentManager()应该让管理员知道现有的活动。

我需要一些帮助来解决这个问题。

Answer 1

查看对话框片段你只需要调用dialogfrag.show（Fmanager，tag）; 通过事务添加它会产生异常

Answer 2

使用getFragmentManager而不是getSupportFragmentManager

dialog.show(getFragmentManager(), "submitting"); // The second parameter doesn't really matter.

如果这不起作用，请延伸DialogFragment来执行此操作。关键是在构建对话框时使用Activity而不是使用支持库。

dialog = new AlertDialogFragment(title, message);
dialog.show(getFragmentManager(), "submitting");

AlertDialogFragment：

    public class AlertDialogFragment extends DialogFragment {

        static final String TAG_TITLE = "title";
        static final String TAG_MSG = "message";

        public AlertDialogFragment(){

        }

        public AlertDialogFragment(String title, String message) {
            Bundle b = new Bundle();
            b.putString(TAG_TITLE, title);
            b.putString(TAG_MSG, message);

            setArguments(b);
        }

        public AlertDialogFragment newInstance(String title, String message) {
            AlertDialogFragment frag = new AlertDialogFragment();
            Bundle b = new Bundle();
            b.putString(TAG_TITLE, title);
            b.putString(TAG_MSG, message);

            frag.setArguments(b);
            return frag;
        }

        public Dialog onCreateDialog(Bundle savedInstanceState) {
            String title = getArguments().getString(TAG_TITLE);
            String message = getArguments().getString(TAG_MSG);
                // Use getActivity()!
            return new AlertDialog.Builder(getActivity()).setTitle(title)
                    .setMessage(message)
                    .setNegativeButton("Dismiss", new OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dismiss();
                        }
                    })
                    .setOnCancelListener(new OnCancelListener() {

                        @Override
                        public void onCancel(DialogInterface dialog) {
                            Log.d(TAG, "Dialog cancel");
                        }
                    }).create();
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            Log.d(TAG, "Cancel Dialog");
            super.onCancel(dialog);
        }

        @Override
        public void onDismiss(DialogInterface dialog) {
            Log.d(TAG, "Dismiss Dialog");
            super.onDismiss(dialog);
        }
    }

}

Answer 3

您的类应该扩展FragmentActivity而不是Activity。这解决了我的问题

兼容性库中的getSupportFragmentManager失败

3 个答案: