一個封裝好的SharedPreferences,可以拿來直接用

package utils;

import android.content.SharedPreferences;
import android.graphics.drawable.Drawable;
import android.view.View;

/**
 * 訂單用
 */
public class CommonUtils {
    public static final String TAG = "logins";//sp文件的xml名稱
    private static SharedPreferences sharedPreferences;

    /**
     * DashApplication.getAppContext()可以使用,但是會使用系統默認的主題樣式，如果你自定義了某些樣式可能不會被使用
     * @param layoutId
     * @return
     */
    public static View inflate(int layoutId) {
        View view = View.inflate(MyApplication.getAppContext(), layoutId, null);
        return view;
    }

    /**
     * dip---px
     *
     * @param dip 設備獨立像素device independent px....1dp = 3px 1dp = 2px 1dp = 1.5px
     * @return
     */
    public static int dip2px(int dip) {
        //獲取像素密度
        float density = MyApplication.getAppContext().getResources().getDisplayMetrics().density;
        //
        int px = (int) (dip * density + 0.5f);//100.6
        return px;

    }

    /**
     * px-dip
     *
     * @param px
     * @return
     */
    public static int px2dip(int px) {
        //獲取像素密度
        float density = MyApplication.getAppContext().getResources().getDisplayMetrics().density;
        //
        int dip = (int) (px / density + 0.5f);
        return dip;

    }

    /**
     * 獲取資源中的字符串
     * @param stringId
     * @return
     */
    public static String getString(int stringId) {
        return MyApplication.getAppContext().getResources().getString(stringId);
    }

    public static Drawable getDrawable(int did) {
        return MyApplication.getAppContext().getResources().getDrawable(did);
    }

    public static int getDimens(int id) {
        return MyApplication.getAppContext().getResources().getDimensionPixelSize(id);
    }

    /**
     * sp存入字符串類型的值
     * @param flag
     * @param str
     */
    public static void saveString(String flag, String str) {
        if (sharedPreferences == null) {
            sharedPreferences = MyApplication.getAppContext().getSharedPreferences(TAG, MyApplication.getAppContext().MODE_PRIVATE);
        }
        SharedPreferences.Editor edit = sharedPreferences.edit();
        edit.putString(flag, str);
        edit.commit();
    }

    public static String getString(String flag) {
        if (sharedPreferences == null) {
            sharedPreferences = MyApplication.getAppContext().getSharedPreferences(TAG, MyApplication.getAppContext().MODE_PRIVATE);
        }
        return sharedPreferences.getString(flag, "");
    }

    public static boolean getBoolean(String tag) {
        if (sharedPreferences == null) {
            sharedPreferences = MyApplication.getAppContext().getSharedPreferences(TAG, MyApplication.getAppContext().MODE_PRIVATE);
        }
        return sharedPreferences.getBoolean(tag, false);
    }

    public static void putBoolean(String tag, boolean content) {
        if (sharedPreferences == null) {
            sharedPreferences = MyApplication.getAppContext().getSharedPreferences(TAG, MyApplication.getAppContext().MODE_PRIVATE);
        }
        SharedPreferences.Editor edit = sharedPreferences.edit();
        edit.putBoolean(tag, content);
        edit.commit();
    }

    /**
     * 清除sp數據
     * @param tag
     */
    public static void clearSp(String tag) {
        if (sharedPreferences == null) {
            sharedPreferences = MyApplication.getAppContext().getSharedPreferences(TAG, MyApplication.getAppContext().MODE_PRIVATE);
        }
        SharedPreferences.Editor edit = sharedPreferences.edit();
        edit.remove(tag);
        edit.commit();
    }

    /**
     * 自己寫的運行在主線程的方法
     * 如果是主線程,執行任務,否則使用handler發送到主線程中去執行
     *
     *
     * @param runable
     */
    public static void runOnUIThread(Runnable runable) {
        //先判斷當前屬於子線程還是主線程
        if (android.os.Process.myTid() == MyApplication.getMainThreadId()) {
            runable.run();
        } else {
            //子線程
            MyApplication.getAppHanler().post(runable);
        }
    }
}