Foreword
A lot of time to analyze the data in the project which is necessary to use the chart, there are many excellent charts open source library to share with you today is on GitHub MPAndroidChart bar graph. Brief MPAndroidChart: he can achieve charts drag, 3D, partial view, dynamic data display and other functions.
Official Source Address: github.com/PhilJay/MPA...
Nonsense is not to say, give a look to see everyone renderings
Steps
The first step: the need to rely on the library to your project
implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0-alpha'
implementation 'com.google.android.material:material:1.0.0'
Step two: xml in
<com.github.mikephil.charting.charts.BarChart android:id="@+id/chart1" android:layout_width="match_parent" android:layout_height="300dp" />
The third step: ValueFormatter.java
/**
* Class to format all values before they are drawn as labels.
*/
public abstract class ValueFormatter implements IAxisValueFormatter, IValueFormatter {/**
* <b>DO NOT USE</b>, only for backwards compatibility and will be removed in future versions.
*
* @param value the value to be formatted
* @param axis the axis the value belongs to
* @return formatted string label
*/@Override@Deprecatedpublic String getFormattedValue(float value, AxisBase axis) { return getFormattedValue(value);
}/**
* <b>DO NOT USE</b>, only for backwards compatibility and will be removed in future versions.
* @param value the value to be formatted
* @param entry the entry the value belongs to - in e.g. BarChart, this is of class BarEntry
* @param dataSetIndex the index of the DataSet the entry in focus belongs to
* @param viewPortHandler provides information about the current chart state (scale, translation, ...)
* @return formatted string label
*/@Override@Deprecatedpublic String getFormattedValue(float value, Entry entry, int dataSetIndex, ViewPortHandler viewPortHandler) { return getFormattedValue(value);
}/**
* Called when drawing any label, used to change numbers into formatted strings.
*
* @param value float to be formatted
* @return formatted string label
*/public String getFormattedValue(float value) { return String.valueOf(value);
}/**
* Used to draw axis labels, calls {@link #getFormattedValue(float)} by default.
*
* @param value float to be formatted
* @param axis axis being labeled
* @return formatted string label
*/public String getAxisLabel(float value, AxisBase axis) { return getFormattedValue(value);
}/**
* Used to draw bar labels, calls {@link #getFormattedValue(float)} by default.
*
* @param barEntry bar being labeled
* @return formatted string label
*/public String getBarLabel(BarEntry barEntry) { return getFormattedValue(barEntry.getY());
}/**
* Used to draw stacked bar labels, calls {@link #getFormattedValue(float)} by default.
*
* @param value current value to be formatted
* @param stackedEntry stacked entry being labeled, contains all Y values
* @return formatted string label
*/public String getBarStackedLabel(float value, BarEntry stackedEntry) { return getFormattedValue(value);
}/**
* Used to draw line and scatter labels, calls {@link #getFormattedValue(float)} by default.
*
* @param entry point being labeled, contains X value
* @return formatted string label
*/public String getPointLabel(Entry entry) { return getFormattedValue(entry.getY());
}/**
* Used to draw pie value labels, calls {@link #getFormattedValue(float)} by default.
*
* @param value float to be formatted, may have been converted to percentage
* @param pieEntry slice being labeled, contains original, non-percentage Y value
* @return formatted string label
*/public String getPieLabel(float value, PieEntry pieEntry) { return getFormattedValue(value);
}/**
* Used to draw radar value labels, calls {@link #getFormattedValue(float)} by default.
*
* @param radarEntry entry being labeled
* @return formatted string label
*/public String getRadarLabel(RadarEntry radarEntry) { return getFormattedValue(radarEntry.getY());
}/**
* Used to draw bubble size labels, calls {@link #getFormattedValue(float)} by default.
*
* @param bubbleEntry bubble being labeled, also contains X and Y values
* @return formatted string label
*/public String getBubbleLabel(BubbleEntry bubbleEntry) { return getFormattedValue(bubbleEntry.getSize());
}/**
* Used to draw high labels, calls {@link #getFormattedValue(float)} by default.
*
* @param candleEntry candlestick being labeled
* @return formatted string label
*/public String getCandleLabel(CandleEntry candleEntry) { return getFormattedValue(candleEntry.getHigh());
}
}
第四步：MyValueFormatter
public class MyValueFormatter extends ValueFormatter{private final DecimalFormat mFormat;private String suffix;public MyValueFormatter(String suffix) {
mFormat = new DecimalFormat("0000"); this.suffix = suffix;
}@Overridepublic String getFormattedValue(float value) { return mFormat.format(value) + suffix;
}@Overridepublic String getAxisLabel(float value, AxisBase axis) { if (axis instanceof XAxis) { return mFormat.format(value);
} else if (value > 0) { return mFormat.format(value) + suffix;
} else { return mFormat.format(value);
}
}
}
复制代码
第五步：MainAcyivity
package detongs.hbqianze.him.linechart; import android.os.Bundle; import android.util.Log; import android.view.WindowManager; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import com.github.mikephil.charting.charts.BarChart; import com.github.mikephil.charting.components.XAxis; import com.github.mikephil.charting.components.YAxis; 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 com.github.mikephil.charting.interfaces.datasets.IDataSet; import com.github.mikephil.charting.utils.ColorTemplate; import java.util.ArrayList; import detongs.hbqianze.him.linechart.chart.MyValueFormatter; import detongs.hbqianze.him.linechart.chart.ValueFormatter; public class MainActivity extends AppCompatActivity {private BarChart chart;private TextView te_cache;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
chart = findViewById(R.id.chart1);
te_cache = findViewById(R.id.te_cache);
chart.getDescription().setEnabled(false); //设置最大值条目，超出之后不会有值
chart.setMaxVisibleValueCount(60); //分别在x轴和y轴上进行缩放
chart.setPinchZoom(true); //设置剩余统计图的阴影
chart.setDrawBarShadow(false); //设置网格布局
chart.setDrawGridBackground(true); //通过自定义一个x轴标签来实现2,015 有分割符符bug
ValueFormatter custom = new MyValueFormatter(" "); //获取x轴线
XAxis xAxis = chart.getXAxis(); //设置x轴的显示位置
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM); //设置网格布局
xAxis.setDrawGridLines(true); //图表将避免第一个和最后一个标签条目被减掉在图表或屏幕的边缘
xAxis.setAvoidFirstLastClipping(false); //绘制标签 指x轴上的对应数值 默认true
xAxis.setDrawLabels(true);
xAxis.setValueFormatter(custom); //缩放后x 轴数据重叠问题
xAxis.setGranularityEnabled(true); //获取右边y标签
YAxis axisRight = chart.getAxisRight();
axisRight.setStartAtZero(true); //获取左边y轴的标签
YAxis axisLeft = chart.getAxisLeft(); //设置Y轴数值 从零开始
axisLeft.setStartAtZero(true);
chart.getAxisLeft().setDrawGridLines(false); //设置动画时间
chart.animateXY(600,600);
chart.getLegend().setEnabled(true);
getData(); //设置柱形统计图上的值
chart.getData().setValueTextSize(10); for (IDataSet set : chart.getData().getDataSets()){
set.setDrawValues(!set.isDrawValuesEnabled());
}
}public void getData(){
ArrayList<BarEntry> values = new ArrayList<>();
Float aFloat = Float.valueOf("2015");
Log.v("xue","aFloat+++++"+aFloat);
BarEntry barEntry = new BarEntry(aFloat,Float.valueOf("100"));
BarEntry barEntry1 = new BarEntry(Float.valueOf("2016"),Float.valueOf("210"));
BarEntry barEntry2 = new BarEntry(Float.valueOf("2017"),Float.valueOf("300"));
BarEntry barEntry3 = new BarEntry(Float.valueOf("2018"),Float.valueOf("450"));
BarEntry barEntry4 = new BarEntry(Float.valueOf("2019"),Float.valueOf("300"));
BarEntry barEntry5 = new BarEntry(Float.valueOf("2020"),Float.valueOf("650"));
BarEntry barEntry6 = new BarEntry(Float.valueOf("2021"),Float.valueOf("740"));
values.add(barEntry);
values.add(barEntry1);
values.add(barEntry2);
values.add(barEntry3);
values.add(barEntry4);
values.add(barEntry5);
values.add(barEntry6);
BarDataSet set1;if (chart.getData() != null &&
chart.getData().getDataSetCount() > 0) {
set1 = (BarDataSet) chart.getData().getDataSetByIndex(0);
set1.setValues(values);
chart.getData().notifyDataChanged();
chart.notifyDataSetChanged();
} else {
set1 = new BarDataSet(values, "点折水");
set1.setColors(ColorTemplate.VORDIPLOM_COLORS);
set1.setDrawValues(false);
ArrayList<IBarDataSet> dataSets = new ArrayList<>();
dataSets.add(set1);
BarData data = new BarData(dataSets);
chart.setData(data);
chart.setFitBars(true);
} //绘制图表chart.invalidate();
}
}
At last
Articles written here is over, if you think the article is well written give followers chant? Your support is my greatest motivation! If you want to know there is a small partner MPAndroidChart other properties can also give me a message.
