做一个统计分布条，比如每个月的支出分布情况，某一类盈利的收入类型。
这里没有采用柱状图、饼图的做法，所以想要柱状图或者饼图的可以不用往下看了，推荐一个图表框架MPAndroidChart
，可以实现柱状图、饼图等图表。

效果图

20190625120649.png

实现原理

原理很简单，就是继承一个LinearLayout，通过addView的方式动态去添加View，每一个支出类型就是一个TextView。采用动态添加的原因是，因为每个占比大小是不一样的，我们需要去计算出并且设置TextView的宽度。
CoinPosition 封装的一个比例分布类，是该控件的一个静态内部类。

public static class CoinPosition{
        //每个Item的占比以及名字
        private String coinName;
        private double percent;

        public CoinPosition(String coinName, double percent) {
            this.coinName = coinName;
            this.percent = percent;
        }

        public String getCoinName() {
            return coinName;
        }

        public void setCoinName(String coinName) {
            this.coinName = coinName;
        }

        public double getPercent() {
            return percent;
        }

        public void setPercent(double percent) {
            this.percent = percent;
        }
    }

核心代码：

 private View getChildView(CoinPosition coinPosition,int index){
        LinearLayout.LayoutParams params;
        if(index == data.size()-1){//1
            params= new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);//2
        }else {
            params= new LinearLayout.LayoutParams((int) (parentWidth * coinPosition.percent),LayoutParams.MATCH_PARENT);//3
        }
        TextView textView=new TextView(getContext());
        textView.setLayoutParams(params);
        textView.setText(coinPosition.coinName);
        textView.setGravity(Gravity.CENTER);
        textView.setTextSize(12);
        textView.setTextColor(Color.parseColor("#FFFFFF"));
        if(index<colorRes.length){
            textView.setBackgroundColor(colorRes[index]);
        }
        return textView;
    }

getChildView去获得子View的实例，并且将相应的名字、控件宽度已经背景颜色配置上去。
注释1中判断索引位置，注释3在设定子View宽度的时候是有丢失精度取整的，所以在注释1中需要判断当前索引是否为数据的最后一个，最后一个不用注释3的方法得到宽度，否则的话会出现控件会出现空白，直接传入LayoutParams.MATCH_PARENT，利用完剩余的父布局宽度。

完整的代码：

package com.beidd.digiccy.myapplication;

import android.content.Context;
import android.graphics.Color;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Hugh.HYS
 * @date 2019/6/24
 */
public class DistributionLine extends LinearLayout {

    private List<CoinPosition> data=new ArrayList<>();
    private LayoutInflater layoutInflater;
    private int parentWidth;
    private int[] colorRes=new int[6];

    private Handler handler;

    public List<CoinPosition> getData() {
        return data;
    }

    public void setData(List<CoinPosition> data) {

        if(data.size()==0){
            return;
        }
        this.data.clear();
        this.data.addAll(data);
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                updateView();
            }
        },500);

    }

    public DistributionLine(Context context) {
        super(context);
        initConfig();
    }

    public DistributionLine(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initConfig();
    }

    public DistributionLine(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initConfig();
    }

    public DistributionLine(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initConfig();
    }

    private void initConfig(){
        setOrientation(LinearLayout.HORIZONTAL);
        if(handler==null){
            handler=new Handler();
        }
        if(layoutInflater==null){
            layoutInflater= LayoutInflater.from(getContext());
        }
        //初始化颜色配置
        colorRes[0]= Color.parseColor("#DC143C");
        colorRes[1]= Color.parseColor("#4B0082");
        colorRes[2]= Color.parseColor("#FF0000");
        colorRes[3]= Color.parseColor("#00FFFF");
        colorRes[4]= Color.parseColor("#2E8B57");
        colorRes[5]= Color.parseColor("#DAA520");
    }

    private void updateView(){
        removeAllViews();
        parentWidth=getMeasuredWidth();
        for (int i=0;i<data.size();i++){
           addView(getChildView(data.get(i),i));
        }

    }

    private View getChildView(CoinPosition coinPosition,int index){
        LinearLayout.LayoutParams params;
        if(index == data.size()-1){
            params= new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
        }else {
            params= new LinearLayout.LayoutParams((int) (parentWidth * coinPosition.percent),LayoutParams.MATCH_PARENT);
        }
        TextView textView=new TextView(getContext());
        textView.setLayoutParams(params);
        textView.setText(coinPosition.coinName);
        textView.setGravity(Gravity.CENTER);
        textView.setTextSize(12);
        textView.setTextColor(Color.parseColor("#FFFFFF"));
        if(index<colorRes.length){
            textView.setBackgroundColor(colorRes[index]);
        }
        return textView;
    }

    public static class CoinPosition{
        //每个Item的占比以及名字
        private String coinName;
        private double percent;

        public CoinPosition(String coinName, double percent) {
            this.coinName = coinName;
            this.percent = percent;
        }

        public String getCoinName() {
            return coinName;
        }

        public void setCoinName(String coinName) {
            this.coinName = coinName;
        }

        public double getPercent() {
            return percent;
        }

        public void setPercent(double percent) {
            this.percent = percent;
        }
    }

}

测试：

package com.beidd.digiccy.myapplication;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Hugh.HYS
 * @date 2019/4/3
 */
public class TestActivity extends AppCompatActivity {

    private DistributionLine distributionLine;
    final List<DistributionLine.CoinPosition> data=new ArrayList<>();


    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.act);
        distributionLine=findViewById(R.id.dis);
        data.clear();
        data.add(new DistributionLine.CoinPosition("投资",0.3));
        data.add(new DistributionLine.CoinPosition("衣服",0.2));
        data.add(new DistributionLine.CoinPosition("吃喝",0.2));
        data.add(new DistributionLine.CoinPosition("玩乐",0.1));
        data.add(new DistributionLine.CoinPosition("出行",0.1));
        data.add(new DistributionLine.CoinPosition("其它",0.1));
        distributionLine.setData(data);


    }
}