BarChart

長條圖跟折線圖差不多, 把Entry變成BarEntry記錄頂點位置, 其他將Line改成Bar即可

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import com.github.mikephil.charting.charts.BarChart;
import com.github.mikephil.charting.data.BarData;
import com.github.mikephil.charting.data.BarDataSet;
import com.github.mikephil.charting.data.BarEntry;
import com.github.mikephil.charting.interfaces.datasets.IBarDataSet;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
    final int COUNT = 10;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BarChart chart = (BarChart)findViewById(R.id.chart_line);
        BarDataSet bar=new BarDataSet(getPoints(), "Label 1");
        bar.setBarBorderColor(0xff0000ff);
        bar.setBarBorderWidth(1);
        bar.setColor(0xffff0000);
        List<IBarDataSet> bars=new ArrayList<>();
        bars.add(bar);
        chart.setData(new BarData(bars));
        chart.invalidate();
    }
    private List<BarEntry> getPoints(){
        List<BarEntry> points = new ArrayList<>();
        for(int i=0;i<COUNT;i++){
            points.add(new BarEntry(i, (float)Math.random()*20));
        }
        return points;
    }
}

bar

Stacked Bar Chart

將長條圖堆疊加起來(比如早中晚的數量), 稱為Stacked Bar, 但Stacked Bar Chart一樣是使用Bar Chart, 只是傳入BarEntry的資料變成陣列而以. 底下藍色的部份, 即為變更的代碼

package com.asuscomm.mychart;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import com.github.mikephil.charting.charts.BarChart;
import com.github.mikephil.charting.data.BarData;
import com.github.mikephil.charting.data.BarDataSet;
import com.github.mikephil.charting.data.BarEntry;
import com.github.mikephil.charting.interfaces.datasets.IBarDataSet;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
    final int COUNT = 10;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BarChart chart = (BarChart)findViewById(R.id.chart_line);
        BarDataSet bar=new BarDataSet(getPoints(), "Label 1");
        bar.setColors(new int[]{0xff00ff00,0xffff0000,0xff0000ff});
        List<IBarDataSet> bars=new ArrayList<>();
        bars.add(bar);
        chart.setData(new BarData(bars));
        chart.invalidate();
    }
    private List<BarEntry> getPoints(){
        List<BarEntry> points = new ArrayList<>();
        for(int i=0;i<COUNT;i++){
            points.add(new BarEntry(i, new float[]{(float)Math.random()*20, (float)Math.random()*20,(float)Math.random()*20}));
        }
        return points;
    }
}

stackbarchart

HorizontalBarChart

上述的橫向圖是因為螢幕轉向時, 圖型跟著轉向. 如果螢幕設定為垂直鎖定, 又想製作水平橫向長條圖的話, 只需將Layout改成HorizontalBarChart即可

<com.github.mikephil.charting.charts.HorizontalBarChart
    android:id="@+id/chart"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

版面設定

Description

右下角有一個 Description, 若要將之取消, 請使用下面代碼

Description des=new Description();
des.setText("");
chart.setDescription(des);

X軸 Label

X 軸 Label的更改, 需從chart取得XAxis物件, 再由xAxis.setValueFormatter()傳入 ValueFormatter物件, 此物件實作 getFormattedValue()方法, 將要設定的Label傳回

在產生BarEntry時, 第一參數為x, 第二參數為y, 此時再加入第三參數String, 即X Label的字串

public class MainActivity extends AppCompatActivity {
    final int COUNT = 10;
    List<BarEntry>points;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        BarChart chart = (BarChart)findViewById(R.id.chart_line);
        points=getPoints();
        BarDataSet bar=new BarDataSet(points, "");
        bar.setColors(new int[]{0xff00ff00,0xffff0000,0xff0000ff});
        bar.setStackLabels(new String[]{"早班","中班","晚班"});
        List<IBarDataSet> bars=new ArrayList<>();
        bars.add(bar);
        chart.setData(new BarData(bars));
        Description des=new Description();
        des.setText("");
        chart.setDescription(des);
        XAxis xAxis=chart.getXAxis();
        xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
        xAxis.setValueFormatter(new ValueFormatter() {
            @Override
            public String getFormattedValue(float value) {
                return points.get((int)value).getData().toString();
            }
        });
        
        //保証Y軸左邊由 0 開始
        YAxis leftYAxis = chart.getAxisLeft();
        leftYAxis.setAxisMinimum(0);
        leftYAxis.setYOffset(5);

        //保証Y軸右邊由 0 開始
        YAxis rightYAxis = chart.getAxisRight();
        rightYAxis.setAxisMinimum(0);

        chart.invalidate();
    }
    private List<BarEntry> getPoints(){
        List<BarEntry> points = new ArrayList<>();
        Calendar current=Calendar.getInstance();
        for(int i=0;i<COUNT;i++){
            current.add(Calendar.DAY_OF_YEAR, i);
            //請注意, 傳入的Object Data最好使用String. 
            //若傳入Calendar, 則必需在迴圈內每次都產生一個新的Calendar
            points.add(new BarEntry(i,
                    new float[]{(float)Math.random()*20, (float)Math.random()*20,(float)Math.random()*20},
                    new SimpleDateFormat("yyyy/MM/dd").format(current.getTime())));
        }
        return points;
    }
}

下圖的, X Label變更為日期了

chart_xlabel

移除Legend

Legend legend=this.getLegend();
legend.setEnabled(false);

https://codertw.com/%E7%A8%8B%E5%BC%8F%E8%AA%9E%E8%A8%80/40334/
https://codertw.com/android-%E9%96%8B%E7%99%BC/343018/
https://codertw.com/%E7%A8%8B%E5%BC%8F%E8%AA%9E%E8%A8%80/589653/

長條圖 BarChart