我使用图表库hellocharts-android来显示我的数据。
如何在给定的示例代码中从服务器向火提供价值？
从默认的示例代码：
private void generateDefaultData() {
int numSubcolumns = 1;
int numColumns = 8;
// Column can have many subcolumns, here by default I use 1 subcolumn in each of 8 columns.
List<Column> columns = new ArrayList<Column>();
List<SubcolumnValue> values;
for (int i = 0; i < numColumns; ++i) {
values = new ArrayList<SubcolumnValue>();
for (int j = 0; j < numSubcolumns; ++j) {
values.add(new SubcolumnValue((float) Math.random() * 50f + 5, ChartUtils.pickColor()));
}
Column column = new Column(values);
column.setHasLabels(hasLabels);
column.setHasLabelsOnlyForSelected(hasLabelForSelected);
columns.add(column);
}
data = new ColumnChartData(columns);
if (hasAxes) {
Axis axisX = new Axis();
Axis axisY = new Axis().setHasLines(true);
if (hasAxesNames) {
axisX.setName("Axis X");
axisY.setName("Axis Y");
}
data.setAxisXBottom(axisX);
data.setAxisYLeft(axisY);
} else {
data.setAxisXBottom(null);
data.setAxisYLeft(null);
}
chart.setColumnChartData(data);
}
我适合我的代码和结果：
private void generateDefaultData() {
ApiInterface apiService = ApiClient.getVisitor().create(ApiInterface.class);
Call<NewVisitorResponse> call = apiService.getVisitor();
call.enqueue(new Callback<NewVisitorResponse>() {
@Override
public void onResponse(Call<NewVisitorResponse> call, Response<NewVisitorResponse> response) {
listVisitor = response.body().getVisitor(); // Already done with all data I need from server
int numSubcolumns = 1;
int numColumns = 3;
List<Column> columns = new ArrayList<Column>();
List<SubcolumnValue> values;
for (int i = 0; i < listVisitor.size(); ++i) {
values = new ArrayList<SubcolumnValue>();
for (int j = 0; j < numSubcolumns; ++j) {
values.add(new SubcolumnValue(Float.valueOf(listVisitor.get(i).getValue()), ChartUtils.pickColor()));
}
Column column = new Column(values);
column.setHasLabels(hasLabels);
column.setHasLabelsOnlyForSelected(hasLabelForSelected);
columns.add(column);
}
data = new ColumnChartData(columns);
if (hasAxes) {
Axis axisX = new Axis();
Axis axisY = new Axis().setHasLines(true);
if (hasAxesNames) {
axisX.setName("Date");
axisY.setName("Value");
}
data.setAxisXBottom(axisX);
data.setAxisYLeft(axisY);
} else {
data.setAxisXBottom(null);
data.setAxisYLeft(null);
}
chart.setColumnChartData(data);
}
@Override
public void onFailure(Call<NewVisitorResponse> call, Throwable t) {
Snackbar.make(getView(), "CONNECTION ERROR. PLEASE TRY AGAIN", Snackbar.LENGTH_LONG).setAction("Action", null).show();
}
});
hidePb();
}
我已经做过，成功的是：
显示的日期数与屏幕上显示的日期数一致
我必须显示从服务器上的日期起的总数据。您可以在
Float.valueOf(listVisitor.get(i).getValue())部分中看到我的问题是
如何更改要由日期数据填充的图表上的标签
从循环？数据应填写
listVisitor.get(i).getDate()我要显示的是替换现有值0 2 4 6 8 10 12，
成为我服务器
listVisitor.get(i).getDate()中的数据我假设必须替换/修改包含的libraries的
Column和SubcolumnValue类。我创建了两个新类，它们的内容与原始库相同，但始终失败。在这种情况下也许我可以提供帮助，该怎么办？我附上这两节课
Column.java
package lecho.lib.hellocharts.model;
import java.util.ArrayList;
import java.util.List;
import lecho.lib.hellocharts.formatter.ColumnChartValueFormatter;
import lecho.lib.hellocharts.formatter.SimpleColumnChartValueFormatter;
import lecho.lib.hellocharts.view.Chart;
/**
* Single column for ColumnChart. One column can be divided into multiple sub-columns(ColumnValues) especially for
* stacked ColumnChart.
* Note: you can set X value for columns or sub-columns, columns are by default indexed from 0 to numOfColumns-1 and
* column index is used as column X value, so first column has X value 0, second clumn has X value 1 etc.
* If you want to display AxisValue for given column you should initialize AxisValue with X value of that column.
*/
public class Column {
private boolean hasLabels = false;
private boolean hasLabelsOnlyForSelected = false;
private ColumnChartValueFormatter formatter = new SimpleColumnChartValueFormatter();
// TODO: consider Collections.emptyList()
private List<SubcolumnValue> values = new ArrayList<SubcolumnValue>();
public Column() {
}
public Column(List<SubcolumnValue> values) {
setValues(values);
}
public Column(Column column) {
this.hasLabels = column.hasLabels;
this.hasLabelsOnlyForSelected = column.hasLabelsOnlyForSelected;
this.formatter = column.formatter;
for (SubcolumnValue columnValue : column.values) {
this.values.add(new SubcolumnValue(columnValue));
}
}
public void update(float scale) {
for (SubcolumnValue value : values) {
value.update(scale);
}
}
public void finish() {
for (SubcolumnValue value : values) {
value.finish();
}
}
public List<SubcolumnValue> getValues() {
return values;
}
public Column setValues(List<SubcolumnValue> values) {
if (null == values) {
this.values = new ArrayList<SubcolumnValue>();
} else {
this.values = values;
}
return this;
}
public boolean hasLabels() {
return hasLabels;
}
public Column setHasLabels(boolean hasLabels) {
this.hasLabels = hasLabels;
if (hasLabels) {
this.hasLabelsOnlyForSelected = false;
}
return this;
}
/**
* @see #setHasLabelsOnlyForSelected(boolean)
*/
public boolean hasLabelsOnlyForSelected() {
return hasLabelsOnlyForSelected;
}
/**
* Set true if you want to show value labels only for selected value, works best when chart has
* isValueSelectionEnabled set to true {@link Chart#setValueSelectionEnabled(boolean)}.
*/
public Column setHasLabelsOnlyForSelected(boolean hasLabelsOnlyForSelected) {
this.hasLabelsOnlyForSelected = hasLabelsOnlyForSelected;
if (hasLabelsOnlyForSelected) {
this.hasLabels = false;
}
return this;
}
public ColumnChartValueFormatter getFormatter() {
return formatter;
}
public Column setFormatter(ColumnChartValueFormatter formatter) {
if (null != formatter) {
this.formatter = formatter;
}
return this;
}
}
SubcolumnValue.java
package lecho.lib.hellocharts.model;
import java.util.Arrays;
import lecho.lib.hellocharts.util.ChartUtils;
import lecho.lib.hellocharts.view.Chart;
/**
* Single sub-column value for ColumnChart.
*/
public class SubcolumnValue {
private float value;
private float originValue;
private float diff;
private int color = ChartUtils.DEFAULT_COLOR;
private int darkenColor = ChartUtils.DEFAULT_DARKEN_COLOR;
private char[] label;
public SubcolumnValue() {
setValue(0);
}
public SubcolumnValue(float value) {
// point and targetPoint have to be different objects
setValue(value);
}
public SubcolumnValue(float value, int color) {
// point and targetPoint have to be different objects
setValue(value);
setColor(color);
}
public SubcolumnValue(SubcolumnValue columnValue) {
setValue(columnValue.value);
setColor(columnValue.color);
this.label = columnValue.label;
}
public void update(float scale) {
value = originValue + diff * scale;
}
public void finish() {
setValue(originValue + diff);
}
public float getValue() {
return value;
}
public SubcolumnValue setValue(float value) {
this.value = value;
this.originValue = value;
this.diff = 0;
return this;
}
/**
* Set target value that should be reached when data animation finish then call {@link Chart#startDataAnimation()}
*
* @param target
* @return
*/
public SubcolumnValue setTarget(float target) {
setValue(value);
this.diff = target - originValue;
return this;
}
public int getColor() {
return color;
}
public SubcolumnValue setColor(int color) {
this.color = color;
this.darkenColor = ChartUtils.darkenColor(color);
return this;
}
public int getDarkenColor() {
return darkenColor;
}
@Deprecated
public char[] getLabel() {
return label;
}
public SubcolumnValue setLabel(String label) {
this.label = label.toCharArray();
return this;
}
public char[] getLabelAsChars() {
return label;
}
@Deprecated
public SubcolumnValue setLabel(char[] label) {
this.label = label;
return this;
}
@Override
public String toString() {
return "ColumnValue [value=" + value + "]";
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
SubcolumnValue that = (SubcolumnValue) o;
if (color != that.color) return false;
if (darkenColor != that.darkenColor) return false;
if (Float.compare(that.diff, diff) != 0) return false;
if (Float.compare(that.originValue, originValue) != 0) return false;
if (Float.compare(that.value, value) != 0) return false;
if (!Arrays.equals(label, that.label)) return false;
return true;
}
@Override
public int hashCode() {
int result = (value != +0.0f ? Float.floatToIntBits(value) : 0);
result = 31 * result + (originValue != +0.0f ? Float.floatToIntBits(originValue) : 0);
result = 31 * result + (diff != +0.0f ? Float.floatToIntBits(diff) : 0);
result = 31 * result + color;
result = 31 * result + darkenColor;
result = 31 * result + (label != null ? Arrays.hashCode(label) : 0);
return result;
}
}
最佳答案
我不确定listVisitors具有什么类型的数据，但是似乎您需要List的另一个AxisValue。
如果您阅读the documentation ...
如果要显示给定列的AxisValue，则应使用该列的X值初始化AxisValue
因此，...添加axisValues并用axisX = new Axis(axisValues);设置它们
List<Column> columns = new ArrayList<Column>();
List<AxisValue> axisValues = new ArrayList<AxisValue>();
for (int i = 0; i < listVisitor.size(); ++i) {
String label = listVisitor.get(i).getDate().toString();
axisValues.add(new AxisValue(i).setLabel(label);
values = new ArrayList<SubcolumnValue>();
Column column = new Column(values);
columns.add(column);
// ...
}
data = new ColumnChartData(columns);
if (hasAxes) {
Axis axisX = new Axis(axisValues);
// ...
columnData.setAxisXBottom(axisX);
}
关于java - 如何修改图表库类以从服务器获取数据，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38390631/