从片段显示对话框？

我必须谨慎怀疑以前接受的答案，即使用 DialogFragment 是最佳选择。 DialogFragment 的预期（主要）目的似乎是显示作为对话框本身的片段，而不是显示具有要显示的对话框的片段。

我相信使用片段的活动在对话和片段之间进行调解是更好的选择。

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您应该改用 DialogFragment。

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这是一个是/否 DialogFragment 的完整示例：

班上：

public class SomeDialog extends DialogFragment {

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        return new AlertDialog.Builder(getActivity())
            .setTitle("Title")
            .setMessage("Sure you wanna do this!")
            .setNegativeButton(android.R.string.no, new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // do nothing (will close dialog)
                }
            })
            .setPositiveButton(android.R.string.yes,  new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // do something
                }
            })
            .create();
    }
}

开始对话：

        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
        // Create and show the dialog.
        SomeDialog newFragment = new SomeDialog ();
        newFragment.show(ft, "dialog");

您还可以让该类实现 onClickListener 并使用它来代替嵌入式侦听器。

活动回调

如果您想实现回调，这是在您的活动中完成的：

YourActivity extends Activity implements OnFragmentClickListener

和

@Override
public void onFragmentClick(int action, Object object) {
    switch(action) {
        case SOME_ACTION:
        //Do your action here
        break;
    }
}

回调类：

public interface OnFragmentClickListener {
    public void onFragmentClick(int action, Object object);
}

然后要从片段执行回调，您需要确保侦听器是这样附加的：

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    try {
        mListener = (OnFragmentClickListener) activity;
    } catch (ClassCastException e) {
        throw new ClassCastException(activity.toString() + " must implement listeners!");
    }
}

回调是这样执行的：

mListener.onFragmentClick(SOME_ACTION, null); // null or some important object as second parameter.

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对我来说，它是以下 -

我的片段：

public class MyFragment extends Fragment implements MyDialog.Callback
{
    ShowDialog activity_showDialog;

    @Override
    public void onAttach(Activity activity)
    {
        super.onAttach(activity);
        try
        {
            activity_showDialog = (ShowDialog)activity;
        }
        catch(ClassCastException e)
        {
            Log.e(this.getClass().getSimpleName(), "ShowDialog interface needs to be     implemented by Activity.", e);
            throw e;
        }
    }

    @Override
    public void onClick(View view) 
    {
        ...
        MyDialog dialog = new MyDialog();
        dialog.setTargetFragment(this, 1); //request code
        activity_showDialog.showDialog(dialog);
        ...
    }

    @Override
    public void accept()
    {
        //accept
    }

    @Override
    public void decline()
    {
        //decline
    }

    @Override
    public void cancel()
    {
        //cancel
    }

}

我的对话：

public class MyDialog extends DialogFragment implements View.OnClickListener
{
    private EditText mEditText;
    private Button acceptButton;
    private Button rejectButton;
    private Button cancelButton;

    public static interface Callback
    {
        public void accept();
        public void decline();
        public void cancel();
    }

    public MyDialog()
    {
        // Empty constructor required for DialogFragment
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.dialogfragment, container);
        acceptButton = (Button) view.findViewById(R.id.dialogfragment_acceptbtn);
        rejectButton = (Button) view.findViewById(R.id.dialogfragment_rejectbtn);
        cancelButton = (Button) view.findViewById(R.id.dialogfragment_cancelbtn);
        acceptButton.setOnClickListener(this);
        rejectButton.setOnClickListener(this);
        cancelButton.setOnClickListener(this);
        getDialog().setTitle(R.string.dialog_title);
        return view;
    }

    @Override
    public void onClick(View v)
    {
        Callback callback = null;
        try
        {
            callback = (Callback) getTargetFragment();
        }
        catch (ClassCastException e)
        {
            Log.e(this.getClass().getSimpleName(), "Callback of this class must be implemented by target fragment!", e);
            throw e;
        }

        if (callback != null)
        {
            if (v == acceptButton)
            {   
                callback.accept();
                this.dismiss();
            }
            else if (v == rejectButton)
            {
                callback.decline();
                this.dismiss();
            }
            else if (v == cancelButton)
            {
                callback.cancel();
                this.dismiss();
            }
        }
    }
}

活动：

public class MyActivity extends ActionBarActivity implements ShowDialog
{
    ..

    @Override
    public void showDialog(DialogFragment dialogFragment)
    {
        FragmentManager fragmentManager = getSupportFragmentManager();
        dialogFragment.show(fragmentManager, "dialog");
    }
}

DialogFragment 布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/dialogfragment_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:text="@string/example"/>

    <Button
        android:id="@+id/dialogfragment_acceptbtn"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/dialogfragment_textview"
        android:text="@string/accept"
        />

    <Button
        android:id="@+id/dialogfragment_rejectbtn"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_alignLeft="@+id/dialogfragment_acceptbtn"
        android:layout_below="@+id/dialogfragment_acceptbtn"
        android:text="@string/decline" />

     <Button
        android:id="@+id/dialogfragment_cancelbtn"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="20dp"
        android:layout_alignLeft="@+id/dialogfragment_rejectbtn"
        android:layout_below="@+id/dialogfragment_rejectbtn"
        android:text="@string/cancel" />

     <Button
        android:id="@+id/dialogfragment_heightfixhiddenbtn"
        android:layout_width="200dp"
        android:layout_height="20dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="20dp"
        android:layout_alignLeft="@+id/dialogfragment_cancelbtn"
        android:layout_below="@+id/dialogfragment_cancelbtn"
        android:background="@android:color/transparent"
        android:enabled="false"
        android:text=" " />
</RelativeLayout>

正如名称 dialogfragment_heightfixhiddenbtn 所示，尽管说 wrap_content，我只是想不出一种方法来解决底部按钮的高度被切成两半的问题，所以我添加了一个隐藏按钮来“切成”一半。对不起，黑客。

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我自己也是一个初学者，老实说，我找不到一个我能理解或实施的令人满意的答案。

所以这里有一个外部链接，我真的帮助我实现了我想要的。这很简单，也很容易理解。

http://www.helloandroid.com/tutorials/how-display-custom-dialog-your-android-application

这是我试图通过代码实现的：

我有一个承载片段的 MainActivity。我希望在布局顶部出现一个对话框来询问用户输入，然后相应地处理输入。 See a screenshot

这是我的片段的 onCreateView 的样子

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_home_activity, container, false);

    Button addTransactionBtn = rootView.findViewById(R.id.addTransactionBtn);

    addTransactionBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Dialog dialog = new Dialog(getActivity());
            dialog.setContentView(R.layout.dialog_trans);
            dialog.setTitle("Add an Expense");
            dialog.setCancelable(true);

            dialog.show();

        }
    });

我希望它会帮助你

让我知道是否有任何混淆。 :)

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 public void showAlert(){


     AlertDialog.Builder alertDialog = new AlertDialog.Builder(getActivity());
     LayoutInflater inflater = getActivity().getLayoutInflater();
     View alertDialogView = inflater.inflate(R.layout.test_dialog, null);
     alertDialog.setView(alertDialogView);

     TextView textDialog = (TextView) alertDialogView.findViewById(R.id.text_testDialogMsg);
     textDialog.setText(questionMissing);

     alertDialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog, int which) {
             dialog.cancel();
         }
     });
     alertDialog.show();

}

其中 .test_dialog 是 xml 自定义的

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    public static void OpenDialog (Activity activity, DialogFragment fragment){

    final FragmentManager fm = ((FragmentActivity)activity).getSupportFragmentManager();

    fragment.show(fm, "tag");
}

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