MaterialDialogPreference.java

import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.DialogPreference;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import com.afollestad.materialdialogs.MaterialDialog;
import com.afollestad.materialdialogs.MaterialDialog.Builder;

import java.lang.reflect.Method;

/**
 * @author Aidan Follestad (afollestad)
 */
public class MaterialDialogPreference extends DialogPreference {

    private MaterialDialog mDialog;

    public MaterialDialogPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MaterialDialogPreference(Context context) {
        this(context, null);
    }

    @Override
    public Dialog getDialog() {
        return mDialog;
    }

    @Override
    protected void showDialog(Bundle state) {
        Builder mBuilder = new MaterialDialog.Builder(getContext())
                .title(getDialogTitle())
                .icon(getDialogIcon())
                .positiveText(getPositiveButtonText())
                .negativeText(getNegativeButtonText())
                .callback(callback)
                .dismissListener(this);

        View contentView = onCreateDialogView();
        if (contentView != null) {
            onBindDialogView(contentView);
            mBuilder.customView(contentView, false);
        }

        PreferenceManager pm = getPreferenceManager();
        try {
            Method method = pm.getClass().getDeclaredMethod(
                    "registerOnActivityDestroyListener",
                    PreferenceManager.OnActivityDestroyListener.class);
            method.setAccessible(true);
            method.invoke(pm, this);
        } catch (Exception e) {
            e.printStackTrace();
        }

        mDialog = mBuilder.build();
        if (state != null)
            mDialog.onRestoreInstanceState(state);
        requestInputMethod(mDialog);

        mDialog.show();
    }

    /**
     * Callback listener for the MaterialDialog. Positive button checks with
     * OnPreferenceChangeListener before committing user entered text
     */
    private final MaterialDialog.ButtonCallback callback = new MaterialDialog.ButtonCallback() {
        @Override
        public void onPositive(MaterialDialog dialog) {
            onDialogClosed(true);
        }

        @Override
        public void onNegative(final MaterialDialog dialog) {
            onDialogClosed(false);
        }
    };

    /**
     * Copied from DialogPreference.java
     */
    private void requestInputMethod(Dialog dialog) {
        Window window = dialog.getWindow();
        window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
    }

    @Override
    public void onActivityDestroy() {
        super.onActivityDestroy();
        if (mDialog != null && mDialog.isShowing())
            mDialog.dismiss();
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Parcelable superState = super.onSaveInstanceState();
        Dialog dialog = getDialog();
        if (dialog == null || !dialog.isShowing()) {
            return superState;
        }

        final SavedState myState = new SavedState(superState);
        myState.isDialogShowing = true;
        myState.dialogBundle = dialog.onSaveInstanceState();
        return myState;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state == null || !state.getClass().equals(SavedState.class)) {
            // Didn't save state for us in onSaveInstanceState
            super.onRestoreInstanceState(state);
            return;
        }

        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        if (myState.isDialogShowing) {
            showDialog(myState.dialogBundle);
        }
    }

    // From DialogPreference
    private static class SavedState extends BaseSavedState {
        boolean isDialogShowing;
        Bundle dialogBundle;

        public SavedState(Parcel source) {
            super(source);
            isDialogShowing = source.readInt() == 1;
            dialogBundle = source.readBundle();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(isDialogShowing ? 1 : 0);
            dest.writeBundle(dialogBundle);
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {
                    public SavedState createFromParcel(Parcel in) {
                        return new SavedState(in);
                    }

                    public SavedState[] newArray(int size) {
                        return new SavedState[size];
                    }
                };
    }
}