Android 构建者模式

为什么要写构建者模式？
1、不需要在Activity中去管功能的逻辑。
2、相互独立，有利于功能的扩展，需要就用，不需要就不用。
3、高内聚，低耦合，模块之间相互独立，不会对其他的模块产生影响。

为什么我要写构建者模式！
因为项目中列表里面出现了很多的小东西（比如：列表上面有年龄，性别，生日，名字是否要变颜色，好友关系）这些东西。有的列表上面又有，有的上面又没有，每次都要去单独的判断，所以我就想写一个统一的方法俩管理这些小的图标。就像下面这种-_-!
在这里插入图片描述
经典的例子。
AlertDialog

AlertDialog dialog = new AlertDialog.Builder(this)
				.setIcon(R.mipmap.test)
                .setTitle("dialog")
                 .setPositiveButton()
                .setNegativeButton()
                .create();

这种一看链式结构就很整洁，需要什么东西就设置什么东西。不需要就不设置就行了。这种就完全符合我上面项目中遇到的场景。于是就自己写了一个构建这模式。这里记录一下。

public class MyLabelUtils {
	private Context context;
	
   public MyLabelUtils(Builder builder) {
        this.context = builder.context;
    }
    
    public static class Builder {
        private Context context;
        private MyLabelUtils myLabelUtils;
       
        public Builder(Context context) {
            this.context = context;
        }

        public MyLabelUtils build() {
            myLabelUtils = new MyLabelUtils(this);
            return myLabelUtils;
        }

		//清空一次
        public void clear() {
        }
    }
}

把列表上面的逻辑搬进来就行了。

public class MyLabelUtils {

    private Context context;
    private TextView nameTv;
    private String nameStr;
    private int vip;

    private ImageView relationImg;
    private int relationType;

    private int sexType;
    private ImageView sexImg;

    private TextView birthdayTv;
    private String birthdayStr;


    public MyLabelUtils(Builder builder) {
        this.context = builder.context;
        this.nameTv = builder.nameTv;
        this.nameStr = builder.nameStr;
        this.vip = builder.vip;
        this.relationImg = builder.relationImg;
        this.relationType = builder.relationType;
        this.sexType = builder.sexType;
        this.sexImg = builder.sexImg;
        this.birthdayTv = builder.birthdayTv;
        this.birthdayStr = builder.birthdayStr;

        initData();
    }

    private void initData() {
        //名字变色
        if (nameTv != null) {
            nameTv.setText(initnameTextColor(nameStr, vip));
        }

        //设置关系
        if (relationImg != null) {
            initUserRelation(relationType, relationImg);
        }

        //设置性别
        if (sexImg != null) {
            initSex(sexType, sexImg);
        }

        //设置生日
        if (birthdayTv != null) {
            initBirthday(birthdayStr,birthdayTv);
        }

    }


    //名字变色的方法
    private SpannableStringBuilder initnameTextColor(String name, int level) {
        SpannableStringBuilder builder = new SpannableStringBuilder(name + "");
        if (null == name) {
            return builder;
        }
        if (level == 1 || level == 2) {
            builder.setSpan(new ForegroundColorSpan(0xfff34314), 0, name.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); //字体颜色
        } else {
            builder.setSpan(new ForegroundColorSpan(0xff4b4c4c), 0, name.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); //字体颜色
        }
        return builder;
    }

    //关系的方法
    private void initUserRelation(int relationType, ImageView relationImg) {
        if (relationType == 1) {
            relationImg.setVisibility(View.VISIBLE);
            relationImg.setImageResource(R.drawable.label_attention);
        } else if (relationType == 2) {
            relationImg.setVisibility(View.VISIBLE);
            relationImg.setImageResource(R.drawable.label_fan);
        } else if (relationType == 3) {
            relationImg.setVisibility(View.VISIBLE);
            relationImg.setImageResource(R.drawable.label_friend);
        } else {
            relationImg.setVisibility(View.GONE);
        }
    }

    //设置性别
    private void initSex(int sexType, ImageView sexImg) {
        if (sexType == 0) {
            sexImg.setVisibility(View.VISIBLE);
            sexImg.setImageResource(R.drawable.label_female);
        } else if (sexType == 1) {
            sexImg.setVisibility(View.VISIBLE);
            sexImg.setImageResource(R.drawable.label_male);
        } else {
            sexImg.setVisibility(View.GONE);
        }
    }


    //设置生日
    private void initBirthday(String birthdayStr, TextView birthdayTv) {
        if (!JudgeNullUtil.isNull(birthdayStr)) {
            birthdayTv.setVisibility(View.VISIBLE);
            birthdayTv.setText(birthdayStr);
        }else {
            birthdayTv.setVisibility(View.GONE);
        }

    }


    public static class Builder {
        private Context context;
        private MyLabelUtils myLabelUtils;
        private TextView nameTv;
        private String nameStr;
        private int vip;

        private ImageView relationImg;
        private int relationType;

        private int sexType;
        private ImageView sexImg;

        private TextView birthdayTv;
        private String birthdayStr;


        /**
         * 设置生日
         *
         * @param birthdayTv
         * @param birthdayStr
         * @return
         */
        public Builder setBirthday(TextView birthdayTv, String birthdayStr) {
            this.birthdayTv = birthdayTv;
            this.birthdayStr = birthdayStr;
            return this;
        }

        /**
         * 设置性别
         *
         * @param sexType 性别
         * @param sexImg  性别控件
         * @return
         */
        public Builder setSexType(ImageView sexImg, int sexType) {
            this.sexType = sexType;
            this.sexImg = sexImg;
            return this;
        }

        /**
         * 设置等级
         *
         * @param vip 等级
         * @return
         */
        public Builder setVip(int vip) {
            this.vip = vip;
            return this;
        }

        /**
         * 设置关系
         *
         * @param relationType 关系
         * @param relationImg  关系控件
         * @return
         */
        public Builder setUserRelation(ImageView relationImg, int relationType) {
            this.relationType = relationType;
            this.relationImg = relationImg;
            return this;
        }

        /**
         * 名字变色
         *
         * @param nameTv  名字的控件
         * @param nameStr 名字
         * @return
         */
        public Builder setNameColor(TextView nameTv, String nameStr) {
            this.nameTv = nameTv;
            this.nameStr = nameStr;
            return this;
        }


        public Builder(Context context) {
            this.context = context;
        }

        public MyLabelUtils build() {
            myLabelUtils = new MyLabelUtils(this);
            return myLabelUtils;
        }

        public void clear() {
            nameTv = null;
            nameStr = null;
            vip = 0;
            relationImg = null;
            relationType = 0;
            sexImg = null;
            sexType = 0;
            birthdayStr = null;
            birthdayTv = null;

        }
    }

}

使用的时候就很方便了

MyLabelUtils.Builder myLabelUtils = new MyLabelUtils.Builder(context);
		myLabelUtils.clear();
        myLabelUtils.setVip(1)
                .setNameColor(holder.name,"洒家卖蘑菇")
                .setSexType(holder.sex,1)
                .setUserRelation(holder.relation,3)
                .setBirthday(holder.birthdayText,"90后")
                .build();

这样你需要的时候就用不需要的时候就不用就行了。

来源：CSDN

作者：洒家卖蘑菇

链接：https://blog.csdn.net/qq_36510659/article/details/103610243

标签

alertdialog