Why is there no gap between my two AlertDialog buttons?

问题

In my AlertDialog, my Positive Button and Negative Button are "attached." I'm pretty sure there should be a gap between them. Can someone tell me why this is happening? I would be happy to provide any code. Here is what my AlertDialog looks like.

I have a custom View for the Body as well as the Title of my AlertDialog (I won't post that XML code because I don't think it's necessary, but let me know.) In MainActivity, I inflate my custom title and body Views, and override setPositive() and setNegative(), then I customize the color of my buttons using onShow().

Sorry for the convoluted code, but help would be much appreciated :). Here is my MainActivity:

public void openPrompt(View view){
    //builds and opens custom view with prompt.XML
    LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
    EditText input = (EditText)promptView.findViewById(R.id.userInput);

    builder.setCancelable(true).setView(R.layout.customdialoglayout)
    .setNegativeButton("One", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(MainActivity.this,"CANCEL clicked",Toast.LENGTH_SHORT).show();
        }
    })
    .setPositiveButton("Two", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(MainActivity.this,"SET clicked",Toast.LENGTH_SHORT).show();
        }
    });


    //set title with custom XML layout view
    LayoutInflater inflater = getLayoutInflater();
    View titleView = inflater.inflate(R.layout.cutomtitlebar,null);
    builder.setCustomTitle(titleView);

    AlertDialog ad = builder.create();

    //change colors of background and buttons
    ad.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {

            Context context = MainActivity.this;
            Window view = ((AlertDialog)dialog).getWindow();

            view.setBackgroundDrawableResource(R.color.colorPrompt);
           Button negButton = ((AlertDialog) dialog).getButton(DialogInterface.BUTTON_NEGATIVE);
            negButton.setBackgroundColor(context.getResources().getColor(R.color.colorPromptButton));
            negButton.setTextColor(context.getResources().getColor(R.color.colorPromptButtonText));

            Button posButton = ((AlertDialog) dialog).getButton(DialogInterface.BUTTON_POSITIVE);
            posButton.setBackgroundColor(context.getResources().getColor(R.color.colorPromptButton));
            posButton.setTextColor(context.getResources().getColor(R.color.colorPromptButtonText));
        }
    });


    ad.show();


}

EDIT Here is my XML I used for setView():

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="CUSTOM TEXT"
    android:id="@+id/textView3"
    android:layout_gravity="center"/>

回答1:

Why should there be a gap between them? The positive and negative buttons get their layout dimensions from the AlertDialog class and does not, from what I can recall, have any margin in between the buttons.

In order to add a margin, you can either make your own buttons and not use the positive and negative buttons from the AlertDialog or you can add margin to the buttons in a similar manner that you styled the buttons.

ad.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialog) {

            Context context = MainActivity.this;
            Window view = ((AlertDialog)dialog).getWindow();

            view.setBackgroundDrawableResource(R.color.colorPrompt);
           Button negButton = ((AlertDialog) dialog).getButton(DialogInterface.BUTTON_NEGATIVE);
            negButton.setBackgroundColor(context.getResources().getColor(R.color.colorPromptButton));
            negButton.setTextColor(context.getResources().getColor(R.color.colorPromptButtonText));

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
            );
            params.setMargins(20,0,0,0);
            negButton.setLayoutParams(params);
        }
    });

回答2:

Why don't we improvise if we need a gap between your buttons? Instead of using the negative button you can use the neutral button. This is because the positive and the negative are inseparable, But the neutral and positive works fine one in the far right side and one in the far left side. So just change negative button to neutral and it works. See code below:

AlertDialog.Builder builder = new AlertDialog.Builder(preview.this);
                    builder.setTitle("Title here");
                    builder.setMessage("message on dialog here");
                    builder.setCancelable(true);
                    builder.setNeutralButton("Name of button N", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                           //your code here
                        }
                    });
                    builder.setPositiveButton("Name of button P", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            //your code here
                        }
                    });

This is an example which is working perfectly to me, from your code you can edit it like below:

builder.setCancelable(true).setView(R.layout.customdialoglayout)
.setNeutralButton("One", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,"CANCEL clicked",Toast.LENGTH_SHORT).show();
    }
})
.setPositiveButton("Two", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(MainActivity.this,"SET clicked",Toast.LENGTH_SHORT).show();
    }
});

来源：https://stackoverflow.com/questions/37951871/why-is-there-no-gap-between-my-two-alertdialog-buttons