问题
I have a bar graph using AChartEngine library as shown below ::
public class MainActivity extends Activity {
private String[] mMonth = new String[] {
"Jan", "Feb" , "Mar", "Apr", "May", "Jun",
"Jul", "Aug" , "Sep", "Oct", "Nov", "Dec"
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting reference to the button btn_chart
Button btnChart = (Button) findViewById(R.id.btn_chart);
// Defining click event listener for the button btn_chart
OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
// Draw the Income vs Expense Chart
openChart();
}
};
// Setting event click listener for the button btn_chart of the MainActivity layout
btnChart.setOnClickListener(clickListener);
}
private void openChart(){
int[] x = { 0,1,2,3,4,5,6,7 };
int[] income = { 2000,2500,2700,3000,2800,3500,3700,3800};
int[] expense = {2200, 2700, 2900, 2800, 2600, 3000, 3300, 3400 };
// Creating an XYSeries for Income
//CategorySeries incomeSeries = new CategorySeries("Income");
XYSeries incomeSeries = new XYSeries("Income");
// Creating an XYSeries for Income
XYSeries expenseSeries = new XYSeries("Expense");
// Adding data to Income and Expense Series
for(int i=0;i<x.length;i++){
incomeSeries.add(i,income[i]);
expenseSeries.add(i,expense[i]);
}
// Creating a dataset to hold each series
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
// Adding Income Series to the dataset
dataset.addSeries(incomeSeries);
// Adding Expense Series to dataset
dataset.addSeries(expenseSeries);
// Creating XYSeriesRenderer to customize incomeSeries
XYSeriesRenderer incomeRenderer = new XYSeriesRenderer();
incomeRenderer.setColor(Color.rgb(130, 130, 230));
incomeRenderer.setFillPoints(true);
incomeRenderer.setLineWidth(2);
incomeRenderer.setDisplayChartValues(true);
// Creating XYSeriesRenderer to customize expenseSeries
XYSeriesRenderer expenseRenderer = new XYSeriesRenderer();
expenseRenderer.setColor(Color.rgb(220, 80, 80));
expenseRenderer.setFillPoints(true);
expenseRenderer.setLineWidth(2);
expenseRenderer.setDisplayChartValues(true);
Calendar cal = Calendar.getInstance();
cal.clear(Calendar.HOUR);
// Creating a XYMultipleSeriesRenderer to customize the whole chart
XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setXLabels(0);
multiRenderer.setChartTitle("Income vs Expense Chart");
multiRenderer.setXTitle("Year 2012");
multiRenderer.setYTitle("Amount in Dollars");
multiRenderer.setZoomButtonsVisible(true);
for(int i=0; i< x.length;i++){
multiRenderer.addXTextLabel(i, mMonth[i]);
}
// Adding incomeRenderer and expenseRenderer to multipleRenderer
// Note: The order of adding dataseries to dataset and renderers to multipleRenderer
// should be same
multiRenderer.addSeriesRenderer(incomeRenderer);
multiRenderer.addSeriesRenderer(expenseRenderer);
// Creating an intent to plot bar chart using dataset and multipleRenderer
Intent intent = ChartFactory.getBarChartIntent(getBaseContext(), dataset, multiRenderer, Type.DEFAULT);
// Start Activity
startActivity(intent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
Above code graph looks like:
But i need to draw a graph with following property:
- X-axis will have to display current time.as show in below graph time is some where >2am
- each bar in X-axis is 5 minutes bar
- for every 5 minutes i send a data it should draw a bar based on value.
- for now ignore Y axis parameter just need how to plot required X-aixs
The Graph some what looks like this:
回答1:
i did something like this:: for static data
public class MainActivity extends Activity {
final Calendar c = Calendar.getInstance();
int mMinute = c.get(Calendar.MINUTE);
int mHour = c.get(Calendar.HOUR_OF_DAY);
int am =c.get(Calendar.AM_PM);
int[] x =new int[1920];
int[] sleep = {4,3,2,1,4,3,2,1,4,3,2,1,4,1,1,1,4,4,2,2,2,3,3,2,2,2,2,2,1,1,1,1,1,1,4,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,2,2};
public String getnext(int a)
{
String ap;
if(am==1){ap="PM";}
else{ap="AM";}
String s= mHour+" "+ap;
mMinute=mMinute+5;
if (mHour >=12){
mHour=mHour-12;
switch(am){case 0:am=1; break; case 1:am=0;break;}
}
if(mMinute >= 60)
{
mHour= mHour+1;
mMinute=mMinute-60;
}
//Log.d("Gr","mMinute: "+mMinute);
if(mMinute==1 | mMinute==2 | mMinute==3 |mMinute==4 | mMinute==0)
{s= mHour+" "+ap;}
else{s="";}
return (s);}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
openChart();
}
private void openChart(){
XYSeries sleepSeries = new XYSeries("Sleep");
for(int i=0;i<sleep.length;i++){
sleepSeries.add(i,sleep[i]);
}
// Creating a dataset to hold each series
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
// Adding Income Series to the dataset
dataset.addSeries(sleepSeries);
// Creating XYSeriesRenderer to customize incomeSeries
XYSeriesRenderer sleepRenderer = new XYSeriesRenderer();
sleepRenderer.setColor(Color.GREEN);
sleepRenderer.setFillPoints(true);
sleepRenderer.setLineWidth((float) .2);
// Creating a XYMultipleSeriesRenderer to customize the whole chart
XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setXLabels(0);
multiRenderer.setYAxisMin(0);
multiRenderer.setYLabels(0);
multiRenderer.setYAxisMax(4);
multiRenderer.setChartTitle("Sleep vs Time");
multiRenderer.setBarSpacing(.5);
//multiRenderer.setZoomButtonsVisible(true);
multiRenderer.setLegendHeight((int) 5);
multiRenderer.setPanEnabled(true, false);
multiRenderer.addSeriesRenderer(sleepRenderer);
// Creating an intent to plot bar chart using dataset and multipleRenderer
Intent intent = ChartFactory.getBarChartIntent(getBaseContext(), dataset, renderer, Type.DEFAULT);
// Start Activity
startActivity(intent);
}
i got graph like
UPDATE:::
for real time data , update series like
static ArrayList<Integer> sleep = new ArrayList<Integer>();
as and when newval is available
sleep.add(newval);
then call openChart(); in that first clear dataset (dataset.clear();)
then call repaint();
回答2:
You can keep Unix timestamps on the X axis and control the labels yourself. You can add custom X axis labels using:
renderer.addXTextLabel(x, "label");
A Unix timestamp is the value that the getTime() on a Date object returns. So you can add such values to your series:
series.add(date.getTime(), value);
Then, you can add custom labels for some of the values:
SimpleDateFormat format = new SimpleDateFormat("h a");
renderer.addXTextLabel(date.getTime(), format.format(date.getTime()));
回答3:
I think for your requirement, Creating custom bar charts will make easy.Here is the example, you can develop with this example by simply using 5 arrays which you want to show on graph.
Bar Chart in Android With out any Built in jars
Just, go thorough the example and check it.
The main advantage is you need not use any predefined libraries for drawing charts. it will be possible with simple android UI like TextView and ListView
来源：https://stackoverflow.com/questions/15738648/bar-graph-using-achartengine-library