How to change theme for AlertDialog

Question

I was wondering if someone could help me out. I am trying to create a custom AlertDialog. In order to do this, I added the following line of code in styles.xml

Answer 1

I was struggling with this - you can style the background of the dialog using android:alertDialogStyle="@style/AlertDialog" in your theme, but it ignores any text settings you have. As @rflexor said above it cannot be done with the SDK prior to Honeycomb (well you could use Reflection).

My solution, in a nutshell, was to style the background of the dialog using the above, then set a custom title and content view (using layouts that are the same as those in the SDK).

My wrapper:

import com.mypackage.R;

import android.app.AlertDialog;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

public class CustomAlertDialogBuilder extends AlertDialog.Builder {

    private final Context mContext;
    private TextView mTitle;
    private ImageView mIcon;
    private TextView mMessage;

    public CustomAlertDialogBuilder(Context context) {
        super(context);
        mContext = context; 

        View customTitle = View.inflate(mContext, R.layout.alert_dialog_title, null);
        mTitle = (TextView) customTitle.findViewById(R.id.alertTitle);
        mIcon = (ImageView) customTitle.findViewById(R.id.icon);
        setCustomTitle(customTitle);

        View customMessage = View.inflate(mContext, R.layout.alert_dialog_message, null);
        mMessage = (TextView) customMessage.findViewById(R.id.message);
        setView(customMessage);
    }

    @Override
    public CustomAlertDialogBuilder setTitle(int textResId) {
        mTitle.setText(textResId);
        return this;
    }
    @Override
    public CustomAlertDialogBuilder setTitle(CharSequence text) {
        mTitle.setText(text);
        return this;
    }

    @Override
    public CustomAlertDialogBuilder setMessage(int textResId) {
        mMessage.setText(textResId);
        return this;
    }

    @Override
    public CustomAlertDialogBuilder setMessage(CharSequence text) {
        mMessage.setText(text);
        return this;
    }

    @Override
    public CustomAlertDialogBuilder setIcon(int drawableResId) {
        mIcon.setImageResource(drawableResId);
        return this;
    }

    @Override
    public CustomAlertDialogBuilder setIcon(Drawable icon) {
        mIcon.setImageDrawable(icon);
        return this;
    }

}

alert_dialog_title.xml (taken from the SDK)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >
    <LinearLayout
            android:id="@+id/title_template"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center_vertical"
            android:layout_marginTop="6dip"
            android:layout_marginBottom="9dip"
            android:layout_marginLeft="10dip"
            android:layout_marginRight="10dip">

            <ImageView android:id="@+id/icon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="top"
                android:paddingTop="6dip"
                android:paddingRight="10dip"
                android:src="@drawable/ic_dialog_alert" />
            <TextView android:id="@+id/alertTitle"
                style="@style/?android:attr/textAppearanceLarge"
                android:singleLine="true"
                android:ellipsize="end"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>
        <ImageView android:id="@+id/titleDivider"
            android:layout_width="fill_parent"
            android:layout_height="1dip"
            android:scaleType="fitXY"
            android:gravity="fill_horizontal"
            android:src="@drawable/divider_horizontal_bright" />
</LinearLayout>

alert_dialog_message.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/scrollView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingTop="2dip"
            android:paddingBottom="12dip"
            android:paddingLeft="14dip"
            android:paddingRight="10dip">
    <TextView android:id="@+id/message"
                style="?android:attr/textAppearanceMedium"
                android:textColor="@color/dark_grey"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:padding="5dip" />
</ScrollView>

Then just use CustomAlertDialogBuilder instead of AlertDialog.Builder to create your dialogs, and just call setTitle and setMessage as usual.

Answer 2

You can directly assign a theme when you initiate the Builder:

AlertDialog.Builder builder = new AlertDialog.Builder(
                    getActivity(), R.style.MyAlertDialogTheme);

Then customize your theme in your values/styles.xml

<!-- Alert Dialog -->
<style name="MyAlertDialogTheme" parent="Theme.AppCompat.Dialog.Alert">
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:colorBackground">@color/alertDialogBackground</item>
    <item name="android:windowBackground">@color/alertDialogBackground</item>
</style>

Answer 3

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Title");
builder.setMessage("Description");
builder.setPositiveButton("OK", null);
builder.setNegativeButton("Cancel", null);
builder.show();