material-dialogs/library/src/main/java/com/afollestad/materialdialogs/util/DialogUtils.java

package com.afollestad.materialdialogs.util;

import android.content.Context;
import android.content.DialogInterface;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.AttrRes;
import android.util.TypedValue;
import android.view.View;
import android.view.inputmethod.InputMethodManager;

import com.afollestad.materialdialogs.GravityEnum;
import com.afollestad.materialdialogs.MaterialDialog;

/**
 * @author Aidan Follestad (afollestad)
 */
public class DialogUtils {

    public static int adjustAlpha(int color, @SuppressWarnings("SameParameterValue") float factor) {
        int alpha = Math.round(Color.alpha(color) * factor);
        int red = Color.red(color);
        int green = Color.green(color);
        int blue = Color.blue(color);
        return Color.argb(alpha, red, green, blue);
    }

    public static int resolveColor(Context context, @AttrRes int attr) {
        return resolveColor(context, attr, 0);
    }

    public static int resolveColor(Context context, @AttrRes int attr, int fallback) {
        TypedArray a = context.getTheme().obtainStyledAttributes(new int[]{attr});
        try {
            return a.getColor(0, fallback);
        } finally {
            a.recycle();
        }
    }

    public static String resolveString(Context context, @AttrRes int attr) {
        TypedValue v = new TypedValue();
        context.getTheme().resolveAttribute(attr, v, true);
        return (String) v.string;
    }

    private static int gravityEnumToAttrInt(GravityEnum value) {
        switch (value) {
            case CENTER:
                return 1;
            case END:
                return 2;
            default:
                return 0;
        }
    }

    public static GravityEnum resolveGravityEnum(Context context, @AttrRes int attr, GravityEnum defaultGravity) {
        TypedArray a = context.getTheme().obtainStyledAttributes(new int[]{attr});
        try {
            switch (a.getInt(0, gravityEnumToAttrInt(defaultGravity))) {
                case 1:
                    return GravityEnum.CENTER;
                case 2:
                    return GravityEnum.END;
                default:
                    return GravityEnum.START;
            }
        } finally {
            a.recycle();
        }
    }

    public static Drawable resolveDrawable(Context context, @AttrRes int attr) {
        return resolveDrawable(context, attr, null);
    }

    private static Drawable resolveDrawable(Context context, @AttrRes int attr, @SuppressWarnings("SameParameterValue") Drawable fallback) {
        TypedArray a = context.getTheme().obtainStyledAttributes(new int[]{attr});
        try {
            Drawable d = a.getDrawable(0);
            if (d == null && fallback != null)
                d = fallback;
            return d;
        } finally {
            a.recycle();
        }
    }

    public static int resolveDimension(Context context, @AttrRes int attr) {
        return resolveDimension(context, attr, -1);
    }

    private static int resolveDimension(Context context, @AttrRes int attr, int fallback) {
        TypedArray a = context.getTheme().obtainStyledAttributes(new int[]{attr});
        try {
            return a.getDimensionPixelSize(0, fallback);
        } finally {
            a.recycle();
        }
    }

    public static boolean resolveBoolean(Context context, @AttrRes int attr, boolean fallback) {
        TypedArray a = context.getTheme().obtainStyledAttributes(new int[]{attr});
        try {
            return a.getBoolean(0, fallback);
        } finally {
            a.recycle();
        }
    }

    public static boolean resolveBoolean(Context context, @AttrRes int attr) {
        return resolveBoolean(context, attr, false);
    }

    public static boolean isColorDark(int color) {
        double darkness = 1 - (0.299 * Color.red(color) + 0.587 * Color.green(color) + 0.114 * Color.blue(color)) / 255;
        return darkness >= 0.5;
    }

    public static void setBackgroundCompat(View view, Drawable d) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
            //noinspection deprecation
            view.setBackgroundDrawable(d);
        } else {
            view.setBackground(d);
        }
    }

    public static void showKeyboard(DialogInterface di, final MaterialDialog.Builder builder) {
        final MaterialDialog dialog = (MaterialDialog) di;
        if (dialog.getInputEditText() == null) return;
        dialog.getInputEditText().post(new Runnable() {
            @Override
            public void run() {
                dialog.getInputEditText().requestFocus();
                InputMethodManager imm = (InputMethodManager) builder.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                if (imm != null)
                    imm.showSoftInput(dialog.getInputEditText(), InputMethodManager.SHOW_IMPLICIT);
            }
        });
    }

    public static void hideKeyboard(DialogInterface di, final MaterialDialog.Builder builder) {
        final MaterialDialog dialog = (MaterialDialog) di;
        if (dialog.getInputEditText() == null) return;
        dialog.getInputEditText().post(new Runnable() {
            @Override
            public void run() {
                dialog.getInputEditText().requestFocus();
                InputMethodManager imm = (InputMethodManager) builder.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                if (imm != null)
                    imm.hideSoftInputFromWindow(dialog.getInputEditText().getWindowToken(), 0);
            }
        });
    }
}