I am creating Realtime Linechart using MPAndroidChart Library Example link Realtime chart is working fine, I am passing date to xAxis Label update all label same time image ScreenShot
I xAxis label shows 01:00:21 01:00:21 01:00:21 01:00:21
But I want xAxis Label is 01:00:21 01:00:22 01:00:23 01:00:24 Help me to solve the problem its save my life
My code below
public class MainActivity extends AppCompatActivity {
private LineChart chart;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("RealtimeLineChartActivity");
chart = findViewById(R.id.chart1);
chart.getLegend().setEnabled(false);
chart.getDescription().setEnabled(true);
chart.setBackgroundColor(Color.LTGRAY);
LineData data = new LineData();
chart.setData(data);
Legend l = chart.getLegend();
l.setForm(Legend.LegendForm.LINE);
l.setTextColor(Color.WHITE);
XAxis xl = chart.getXAxis();
xl.setTextColor(Color.WHITE);
xl.setPosition(XAxis.XAxisPosition.BOTTOM);
xl.setValueFormatter(new MyXAxisValueFormatter());
xl.setAvoidFirstLastClipping(true);
xl.setEnabled(true);
xl.setTextSize(15f);
YAxis leftAxis = chart.getAxisLeft();
leftAxis.setTextColor(Color.WHITE);
leftAxis.setAxisMaximum(100f);
leftAxis.setAxisMinimum(0f);
leftAxis.setDrawGridLines(true);
YAxis rightAxis = chart.getAxisRight();
rightAxis.setEnabled(false);
}
private void addEntry() {
LineData data = chart.getData();
if (data != null) {
ILineDataSet set = data.getDataSetByIndex(0);
if (set == null) {
set = createSet();
data.addDataSet(set);
}
data.addEntry(new Entry(set.getEntryCount(), (float) (Math.random() * 40) + 30f), 0);
data.notifyDataChanged();
chart.notifyDataSetChanged();
chart.setVisibleXRangeMaximum(4);
chart.moveViewToX(data.getEntryCount());
}
}
private LineDataSet createSet() {
LineDataSet set = new LineDataSet(null, "Dynamic Data");
set.setAxisDependency(YAxis.AxisDependency.LEFT);
set.setValueTextColor(Color.WHITE);
set.setValueTextSize(9f);
set.setDrawValues(false);
return set;
}
private Thread thread;
private void feedMultiple() {
if (thread != null)
thread.interrupt();
final Runnable runnable = new Runnable() {
@Override
public void run() {
addEntry();
}
};
thread = new Thread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 1000; i++) {
// Don't generate garbage runnables inside the loop.
runOnUiThread(runnable);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
thread.start();
}
@Override
protected void onStart() {
feedMultiple();
super.onStart();
}
@Override
protected void onPause() {
super.onPause();
if (thread != null) {
thread.interrupt();
}
}
public static class MyXAxisValueFormatter implements IAxisValueFormatter {
@Override
public String getFormattedValue(float value, AxisBase axis) {
Date date = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("hh:mm:ss");
return formatter.format(date);
}
@Override
public int getDecimalDigits() {
return 0;
}
}
}
it looks like the date instance is being created once and is used several times. i think you should use the value parameter in getFormattedValue callback to calculate the new x-axis value. you may define an initial date as a global variable and calculate the x-axis value by adding the value parameter on it.
so the code must be something like this:
final Date initialDate = new Date();
public static class MyXAxisValueFormatter implements IAxisValueFormatter {
@Override
public String getFormattedValue(float value, AxisBase axis) {
Calendar c = Calendar.getInstance();
c.setTime(initialDate);
c.add(Calendar.SECOND, Math.round(value));
Date newDate = c.getTime();
String formattedDate = new SimpleDateFormat("hh:mm:ss").format(newDate);
return formattedDate;
}
@Override
public int getDecimalDigits() {
return 0;
}
}