Android 常用工具类

1、界面 相关工具类UiUtils

/**
 * @author: wuchao
 * @date: 2018/11/2 13:11
 * @desciption: 界面 相关工具类
 */
public class UiUtils {

    private UiUtils() {
    }

    public static UiUtils getInstance() {
        return Holder.INSTANCE;
    }

    /**
     * dip转px
     *
     * @param dip
     * @return
     */
    public static int dip2px(float dip) {
        float scale = getResources().getDisplayMetrics().density;
        return (int) (dip * scale + 0.5f);
    }

    public static Resources getResources() {
        return getContext().getResources();
    }

    /**
     * 获取上下文
     *
     * @return
     */
    public static Context getContext() {
        return AppApplication.getContext();
    }

    /**
     * 屏幕宽度
     *
     * @return
     */
    public static int getScreenWidth() {
        return getResources().getDisplayMetrics().widthPixels;
    }

    /**
     * 屏幕高度
     *
     * @return
     */
    public static int getScreenHeight() {
        return getResources().getDisplayMetrics().heightPixels;
    }

    /**
     * px转dip
     *
     * @param px
     * @return
     */
    public static int px2dip(int px) {
        final float scale = getResources().getDisplayMetrics().density;
        return (int) (px / scale + 0.5f);
    }

    /**
     * 获取字符数组
     */
    public static String[] getStringArray(int id) {
        return getResources().getStringArray(id);
    }

    /**
     * 获取颜色id
     */
    public static int getColor(int colorId) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            return getResources().getColor(colorId, null);
        } else {
            return getResources().getColor(colorId);
        }
    }

    public static Drawable getDrawable(int id) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            return getResources().getDrawable(id, null);
        } else {
            return getResources().getDrawable(id);
        }
    }

    /**
     * 根据id获取尺寸
     */
    public static int getDimens(int id) {
        return getResources().getDimensionPixelSize(id);
    }

    public static View inflate(int id) {
        return View.inflate(getContext(), id, null);
    }

    public static String getString(int resId) {
        return getContext().getString(resId);
    }

    public static int getTextSize(int id) {
        TypedValue value = new TypedValue();
        getResources().getValue(id, value, true);
        return (int) TypedValue.complexToFloat(value.data);
    }

    /**
     * 状态栏高度
     *
     * @return
     */
    public static int getStatusBarHeight() {
        int statusBarHeight = -1;
        //获取status_bar_height资源的ID
        int resourceId = getResources().getIdentifier("status_bar_height",
                "dimen", "android");
        if (resourceId > 0) {
            //根据资源ID获取响应的尺寸值
            statusBarHeight = getResources().getDimensionPixelSize(resourceId);
        }
        return statusBarHeight;
    }

    private static final class Holder {
        private static final UiUtils INSTANCE = new UiUtils();
    }
}

2、SP 工具类

/**
 * @author: wuchao
 * @date: 2018/11/2 13:44
 * @desciption: SP 工具类
 */
public class SPUtils {
    /**
     * 提示：
     * Activity.getPreferences(int model)生成 Activity名.xml  用于Activity内部存储
     * PreferenceManager.getDefaultSharedPreferences(Context)生成 包名_preferences.xml
     * Context.getSharedPreferences(String name,int model)生成name.xml
     */
    private static SharedPreferences mPreferences =
            UiUtils.getContext().getSharedPreferences(Constant.TABLE_PREFS, Context.MODE_PRIVATE);

    private static SharedPreferences.Editor mEditor = mPreferences.edit();

    /**
     * 向SP存入指定key对应的数据
     * 其中value可以是String、boolean、float、int、long等各种基本类型的值
     *
     * @param key
     * @param value
     */
    public static void putString(String key, String value) {
        mEditor.putString(key, value);
        mEditor.commit();
    }

    public static void putBoolean(String key, boolean value) {
        mEditor.putBoolean(key, value);
        mEditor.commit();
    }

    public static void putFloat(String key, float value) {
        mEditor.putFloat(key, value);
        mEditor.commit();
    }

    public static void putInt(String key, int value) {
        mEditor.putInt(key, value);
        mEditor.commit();
    }

    public static void putLong(String key, long value) {
        mEditor.putLong(key, value);
        mEditor.commit();
    }

    /**
     * 清空SP里所以数据
     */
    public static void clear() {
        mEditor.clear();
        mEditor.commit();
    }

    /**
     * 删除SP里指定key对应的数据项
     *
     * @param key
     */
    public static void remove(String key) {
        mEditor.remove(key);
        mEditor.commit();
    }

    /**
     * 获取SP数据里指定key对应的value。如果key不存在，则返回默认值defValue。
     *
     * @param key
     * @param defValue
     * @return
     */
    public static String getString(String key, String defValue) {
        return mPreferences.getString(key, defValue);
    }

    public static boolean getBoolean(String key, boolean defValue) {
        return mPreferences.getBoolean(key, defValue);
    }

    public static float getFloat(String key, float defValue) {
        return mPreferences.getFloat(key, defValue);
    }

    public static int getInt(String key, int defValue) {
        return mPreferences.getInt(key, defValue);
    }

    public static long getLong(String key, long defValue) {
        return mPreferences.getLong(key, defValue);
    }

    /**
     * 判断SP是否包含特定key的数据
     *
     * @param key
     * @return
     */
    public static boolean contains(String key) {
        return mPreferences.contains(key);
    }
}