SharedPreferences工具类

SharedPreferences 一般存取流程：

//Activity1
        SharedPreferences sp = getSharedPreferences("ProjectName", Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.putBoolean("IsTrue", true);
        editor.commit();

        //Activity2
        SharedPreferences sp = getSharedPreferences("ProjectName", Context.MODE_PRIVATE);
        boolean IsTrue = sp.getBoolean("IsTrue", false);

SharedPreferences工具类：

public class SPUtil {

    private static String ProjectName = "ProjectName";

    public static void putString(Context ctx, String key, String value) {
        getEditor(ctx).putString(key, value).commit();
    }

    public static String getString(Context ctx, String key) {
        SharedPreferences sp = ctx.getSharedPreferences(ProjectName, Context.MODE_PRIVATE);
        return sp == null ? sp.getString(key, " ") : " ";
    }

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

    public static boolean getBoolean(Context ctx, String key) {
        SharedPreferences sp = ctx.getSharedPreferences(ProjectName, Context.MODE_PRIVATE);
        return sp == null ? sp.getBoolean(key, false) : false;
    }

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

    public static int getInt(Context ctx, String key) {
        SharedPreferences sp = ctx.getSharedPreferences(ProjectName, Context.MODE_PRIVATE);
        return sp == null ? sp.getInt(key, -1) : -1;
    }

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

    public static float getFloat(Context ctx, String key) {
        SharedPreferences sp = ctx.getSharedPreferences(ProjectName, Context.MODE_PRIVATE);
        return sp == null ? sp.getFloat(key, -1) : -1;
    }

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

    public static long getLong(Context ctx, String key) {
        SharedPreferences sp = ctx.getSharedPreferences(ProjectName, Context.MODE_PRIVATE);
        return sp == null ? sp.getLong(key, -1) : -1;
    }

    //清除单个键值
    public static void remove(Context ctx, String key) {
        getEditor(ctx).remove(key).commit();
    }

    //清除当前的SharedPreference数据
    public static void clear(Context ctx) {
        getEditor(ctx).clear().commit();
    }


    public static SharedPreferences.Editor getEditor(Context ctx) {
        SharedPreferences sp = ctx.getSharedPreferences(ProjectName, Context.MODE_PRIVATE);
        return sp.edit();
    }

}