加减器

最新推荐文章于 2024-05-02 02:00:56 发布

谁都不叫我

最新推荐文章于 2024-05-02 02:00:56 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/weixin_44660509/article/details/89060791

本文介绍了一个自定义Android视图组件的实现方法，该组件包含加减按钮和数量显示文本，支持通过接口回调更新外部数据。文章详细展示了如何创建自定义视图，包括初始化布局、设置点击监听器及实现数量增减逻辑。

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package com.example.Serview;

import android.content.Context;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import com.example.shoppingcart.R;

public class view extends LinearLayout {
Context context;
private Button jia;
private Button jian;
private TextView textView;

public view(Context context) {
    super(context);
    this.context = context;
    InitView();
}


public view(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.context = context;
    InitView();
}

public view(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    this.context = context;
    InitView();
}

private void InitView() {
    View view = LayoutInflater.from(context).inflate(R.layout.serview_layout, this, true);
    jia = view.findViewById(R.id.butjia);
    jian = view.findViewById(R.id.butjian);
    textView = view.findViewById(R.id.J_TextView);
    jia.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            add();
        }

    });
    jian.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            jian();
        }
    });
}


private void add() {
    String s = textView.getText().toString();
    int newNum = 0;
    if (!TextUtils.isEmpty(s)) {
        newNum = Integer.valueOf(s);
        newNum++;
    }
    textView.setText(newNum+"");
    if (serCall != null) {
        serCall.success(Integer.valueOf(s), newNum);

    }
}

private void jian() {
    int jian = 0;
    String s = textView.getText().toString();
    if (!TextUtils.isEmpty(s)) {
        jian = Integer.valueOf(s);
        jian--;
    }
    if (jian < 0) {
        jian = 0;

        textView.setText(jian+"");
    } else {
        textView.setText(jian+"");
    }
    if (serCall != null) {
        serCall.success(Integer.valueOf(s), jian);
    }
}

public int getpurs() {
    String s = textView.getText().toString();
    if (!TextUtils.isEmpty(s)) {
        return Integer.valueOf(s);
    }
    return 0;
}

public void stepa(int num) {
    if (num > 0) {
        textView.setText(num + "");
    } else {
        Toast.makeText(context, "不能小于零", Toast.LENGTH_SHORT).show();
    }
}

SerCall serCall;

public void setSerCall(SerCall serCall) {
    this.serCall = serCall;
}

public interface SerCall {
    void success(int date, int newdate);
}

}