如何在我的Android项目中实现任意图表

Question

我想使用AnyChart的折线图从Firebase的实时数据库中绘制数据，但我似乎无法使其工作。。。我一直在尝试使用给定的示例代码，但它似乎无法出现，代码似乎编译得很好，但图表没有出现。。。似乎找不到发生了什么。我可以预计这是一个非常简单的错误，但我对android的了解非常基本，对AnyChart的了解是空的。。。

这里有我试图实现的线性图示例的活动：

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
import com.anychart.AnyChart;
import com.anychart.AnyChartView;
import com.anychart.chart.common.dataentry.DataEntry;
import com.anychart.chart.common.dataentry.ValueDataEntry;
import com.anychart.charts.Cartesian;
import com.anychart.core.cartesian.series.Line;
import com.anychart.data.Mapping;
import com.anychart.data.Set;
import com.anychart.enums.Anchor;
import com.anychart.enums.MarkerType;
import com.anychart.enums.TooltipPositionMode;
import com.anychart.graphics.vector.Stroke;
import java.util.ArrayList;
import java.util.List;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
public class Activity2 extends AppCompatActivity {
private FirebaseDatabase database = FirebaseDatabase.getInstance();
private int fieldNum;
TextView tvFieldNum;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_2);

Intent cameFromAct1=getIntent();
fieldNum = Integer.parseInt(cameFromAct1.getStringExtra("fieldNum"));
String fieldName = "Campo"+fieldNum+"".trim();
//tvFieldNum=(TextView)findViewById(R.id.tvFieldNum);
//tvFieldNum.setText(fieldNum+"");

AnyChartView anyChartView = findViewById(R.id.any_chart_view);
anyChartView.setProgressBar(findViewById(R.id.progress_bar));
Cartesian cartesian = AnyChart.line();
cartesian.animation(true);
cartesian.padding(10d, 20d, 5d, 20d);
cartesian.crosshair().enabled(true);
cartesian.crosshair()
.yLabel(true)
.yStroke("#000000",1.5,"10.5","1","1");
//.yStroke((Stroke) null, 1.5, null, (String) null, (String) null);
cartesian.tooltip().positionMode(TooltipPositionMode.POINT);
cartesian.title("Trend of Sales of the Most Popular Products of ACME Corp.");
cartesian.yAxis(0).title("Number of Bottles Sold (thousands)");
cartesian.xAxis(0).labels().padding(5d, 5d, 5d, 5d);
List<DataEntry> seriesData = new ArrayList<>();
seriesData.add(new CustomDataEntry("1986", 3.6, 2.3, 2.8));
seriesData.add(new CustomDataEntry("1987", 7.1, 4.0, 4.1));
seriesData.add(new CustomDataEntry("1988", 8.5, 6.2, 5.1));
seriesData.add(new CustomDataEntry("1989", 9.2, 11.8, 6.5));
seriesData.add(new CustomDataEntry("1990", 10.1, 13.0, 12.5));
seriesData.add(new CustomDataEntry("1991", 11.6, 13.9, 18.0));
seriesData.add(new CustomDataEntry("1992", 16.4, 18.0, 21.0));
seriesData.add(new CustomDataEntry("1993", 18.0, 23.3, 20.3));
seriesData.add(new CustomDataEntry("1994", 13.2, 24.7, 19.2));
seriesData.add(new CustomDataEntry("1995", 12.0, 18.0, 14.4));
seriesData.add(new CustomDataEntry("1996", 3.2, 15.1, 9.2));
seriesData.add(new CustomDataEntry("1997", 4.1, 11.3, 5.9));
seriesData.add(new CustomDataEntry("1998", 6.3, 14.2, 5.2));
seriesData.add(new CustomDataEntry("1999", 9.4, 13.7, 4.7));
seriesData.add(new CustomDataEntry("2000", 11.5, 9.9, 4.2));
seriesData.add(new CustomDataEntry("2001", 13.5, 12.1, 1.2));
seriesData.add(new CustomDataEntry("2002", 14.8, 13.5, 5.4));
seriesData.add(new CustomDataEntry("2003", 16.6, 15.1, 6.3));
seriesData.add(new CustomDataEntry("2004", 18.1, 17.9, 8.9));
seriesData.add(new CustomDataEntry("2005", 17.0, 18.9, 10.1));
seriesData.add(new CustomDataEntry("2006", 16.6, 20.3, 11.5));
seriesData.add(new CustomDataEntry("2007", 14.1, 20.7, 12.2));
seriesData.add(new CustomDataEntry("2008", 15.7, 21.6, 10));
seriesData.add(new CustomDataEntry("2009", 12.0, 22.5, 8.9));
Set set = Set.instantiate();
set.data(seriesData);
Mapping series1Mapping = set.mapAs("{ x: 'x', value: 'value' }");
Mapping series2Mapping = set.mapAs("{ x: 'x', value: 'value2' }");
Mapping series3Mapping = set.mapAs("{ x: 'x', value: 'value3' }");
Line series1 = cartesian.line(series1Mapping);
series1.name("Brandy");
series1.hovered().markers().enabled(true);
series1.hovered().markers()
.type(MarkerType.CIRCLE)
.size(4d);
series1.tooltip()
.position("right")
.anchor(Anchor.LEFT_CENTER)
.offsetX(5d)
.offsetY(5d);
Line series2 = cartesian.line(series2Mapping);
series2.name("Whiskey");
series2.hovered().markers().enabled(true);
series2.hovered().markers()
.type(MarkerType.CIRCLE)
.size(4d);
series2.tooltip()
.position("right")
.anchor(Anchor.LEFT_CENTER)
.offsetX(5d)
.offsetY(5d);
Line series3 = cartesian.line(series3Mapping);
series3.name("Tequila");
series3.hovered().markers().enabled(true);
series3.hovered().markers()
.type(MarkerType.CIRCLE)
.size(4d);
series3.tooltip()
.position("right")
.anchor(Anchor.LEFT_CENTER)
.offsetX(5d)
.offsetY(5d);
cartesian.legend().enabled(true);
cartesian.legend().fontSize(13d);
cartesian.legend().padding(0d, 0d, 10d, 0d);
anyChartView.setChart(cartesian);
}
private class CustomDataEntry extends ValueDataEntry {
CustomDataEntry(String x, Number value, Number value2, Number value3) {
super(x, value);
setValue("value2", value2);
setValue("value3", value3);
}
}
}

这是我在活动中的XML文件

<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Activity2"
android:background="@drawable/background">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.anychart.AnyChartView
android:layout_weight="1"
android:id="@+id/any_chart_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<ProgressBar
android:layout_weight="1"
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>```

Answer 1

XML中缺少一些属性，也尽量不使用ScrollView。作为参考，请查看《快速入门指南》中的XML片段和活动代码。