Hi, I can not load the library on android study also having followed the steps and still get this error: cannot resolve method. Please help me. Import only this "import com.jjoe64.graphview.GraphView;"

Hello- I am new to GitHub, but I am trying to use GraphView 4.0 for an app and for some reason the horizontal labels do not display. Below is the code I am using:

GraphView graph = (GraphView) chrtView.findViewById(R.id.graph); LineGraphSeries series = new LineGraphSeries(new DataPoint[] { new DataPoint(0, 1), new DataPoint(1, 5), new DataPoint(2, 3), new DataPoint(3, 2), new DataPoint(4, 6) }); graph.addSeries(series);

And the following XML which is imbedded in a linear layout.

    <com.jjoe64.graphview.GraphView
    android:layout_width="match_parent"
    android:layout_height="200dip"
    android:id="@+id/graph" />

I am not including the .jar file in my library folder but instead include the following statement with my dependencies in my build.gradle:

compile 'com.jjoe64:graphview:4.0.0'

This is basically the exact code that included in the documentation. Doe anyone have any suggestions what I might be doing incorrectly?

thanks.

Hi Jonas, Thanks for making this nice and intuitive way to quickly draw graphs on Android. I am developing an app which is using GraphView and added some features which were useful for me. My updates are:

1. Provided a callback mechanism to notify user when a sample point is selected.
2. X axis labels can now be multi-line (I needed 2 lines). This pull request covers both the above changes. Do review and take in if possible.

Thanks, Narendra

Added support for missing values (if Y value is NaN it is not drawn, datapoint between two NaN values are drawn as a dot)

Added buffered drawing (great performance improvement!)

ToDo: move the creation of the bitmap/canvas away from the OnDraw event (should only be done at initialisation or orientation change) ToDo: manage scaling when only NaN datapoints are in the series. (skip scaling completely perhaps, or scale to a default range)

I am using appendData() to create a realtime graph. I call this method during a Bluetooth notification callback which is not running on the main UI thread. This creates a ConcurrentModificationException because the LineGraphSeries is being accessed by my thread to add a new DataPoint, and also an iterator in the onDraw routine of the GraphView. I've been able to work around the problem by pushing my call to appendData() onto the UI thread, but a better solution would be to protect the LineGraphSeries storing the DataPoints inside GraphView using synchronization. This would allow any thread to add data to the graph without pushing the work onto the UI thread. Something like this might work:

List list = Collections.synchronizedList(new ArrayList(...));

At the moment graphview doesnt support logarithic scale. However this can be accomplished, by doing the following:

First let's add some points:(Note all values, must be greater then 0, because of log)

  //Creates an ArrayList
  ArrayList<DataPoint> testList = new ArrayList<>();

  //Populates the arrayList whit some values
  float value1 = (float) (Math.log10(1));
  float value2 = (float) (Math.log10(1000));
  float value3 = (float) (Math.log10(30));
  testList.add(new DataPoint(0, value1));
  testList.add(new DataPoint(1,value2));
  testList.add(new DataPoint(2, value3));
  testList.add(new DataPoint(3,value3));
  testList.add(new DataPoint(4, value2));

  //Converts ArrayList<DataPoints> to DataPoints[] array
  DataPoint[] test = new DataPoint[testList.size()];
  test = testList.toArray(test);

  //Adds the dataPoint array to the graph
  LineGraphSeries<DataPoint> seriesLine = new LineGraphSeries<>(test);
  graphQuality.addSeries(seriesLine);

Second we gonna add our max value, take in notice this use log so, when we set the max value to 1600 doesn't mean the max value will be exactly 1600 but an aproximation to that value.(Complain float numbers not me).

    //Defines graph structure
    graphQuality.getViewport().setYAxisBoundsManual(true);
    graphQuality.getViewport().setMaxY(Math.floor(Math.log10(1600)));
    graphQuality.getViewport().setMinY(0);

Finaly we format the Y value so that now replace the log values by the wanted values:

graphExample.getLegendRenderer().setVisible(true);
graphExample.getGridLabelRenderer().setLabelFormatter(new DefaultLabelFormatter() {
@Override
     public String formatLabel(double value, boolean isValueX) {
         if (isValueX) {
             return super.formatLabel(value, isValueX);
         } else {
             String yValue=super.formatLabel(value, isValueX).replaceAll(",",".");
             Float yLogValue = (float)Math.floor((Math.pow(10, Float.valueOf(yValue))));
             return (value<=0)? "-∞":String.valueOf(yLogValue);
          }
      }
});

Hi, I used this awesome library, and it worked for my device, except for my nexus 5 (api 19). I saw in the manifest and the project properties that there is no support for api 19. Can you fix it please? The only problem I noticed is that the graph is not scalable and scrollable.

Thanks, you do a greate job!

Golan.

when i try to take a snapshot of my screen in which GraphView has been used, it throws me an error. "GraphView must be used in hardware accelerated mode" Even though i make it hardware "acceleration =true" on the required Activity and even on Application still the problem persists. I am using version Graphview 4.1.0

I'm new to Gradle so please excuse me, if this is just a noob asking sth. obvious:

Since we still use Eclipse for our day-to-day Android programming, we need to somehow import your lib with the Eclipse Gradle Plugin (by the Spring guys). Uppon clicking the "Build Model" button on Gradles import wizard, the error from the title occurs.

Can you give me some advice, how to solve this without a necessity of installing Android Studio? And please not just by "Install Android Studio"...

Thank you in advance, Daniel

Hello. I have some issues with BarGraphView; (vertical lines count and barwidth)

There are quick fixes:

//BarGraphView.java //float colwidth = (graphwidth - (2 * border)) / values.length; float colwidth = graphwidth / values.length;

//GraphView.java // horizontal labels + lines int hors = horlabels.length; for (int i = 0; i <= horlabels.length; i++) { paint.setColor(Color.DKGRAY); float x = ((graphwidth / hors) * i) + horstart; canvas.drawLine(x, height - border, x, border, paint); paint.setTextAlign(Align.CENTER); if (i < horlabels.length) { paint.setColor(Color.WHITE); canvas.drawText(horlabels[i], x + (graphwidth / hors) / 2, height - 4, paint); } }

My app requires drawing graph from real time data. I have thread with all the communication that is providing the data. In main thread I am reading this data and simply use mSeries1.appendData(new DataPoint(counter,data[0]),true,100); where counter is int that is incremented after each update.

Unfortunately at some point it freeze. I've tried putting it in synchronized block or changing the line of code to mSeries1.appendData(new DataPoint(counter,counter),true,100); and still this same result.

This is how the memory looks like during app running and when it freezes:

Is that some library error or there is something wrong in my code?

Hello everyone! Unfortunately, method 'drawVerticalAxisTitle' in class 'SecondScale' has protected modifaction. I tryed to make inhereter of class SecondScale for calling this method, but constructor of class 'SecondScale' has private modification. How can I display the title for the second y-axis? Help me, please.

https://github.com/jjoe64/GraphView/wiki/Realtime-chart What if i create threads or handler? or service listener register interface etc? like got services that when they get data they send instantly and these i use to update the graphs etc.

In the past i used threads and handlers and it laged like hell then i used your example in link and it was fine and also its fine with the last way i described. Any ideas why so much lag? i though becase in library when iappend data it uses ArrayList but now it is fine i just dont know why it lags so much and now not.

Hi & thanks for your useful library

I cant understand how to draw real-time graph. I read the related page but I don't know where to use those codes. Are they written in a new java class or added to my own activity class?

New to android, sorry for beginner question.

Hello everyone,

I am using this library for plotting real-time coming data. I clean the graph each 2000 samples reiceved in order to not stress the visualization capability. I also activate Log.v in some parts of my code. At some point in a randomly way I got this error from my Log:

V/Plot 1: OK V/Plot 3: OK V/Plot 2: OK V/Plot 1: OK V/Plot 3: OK V/Plot 2: OK D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.myapplication.exo_app, PID: 2918 java.lang.NullPointerException: Attempt to invoke interface method 'double com.jjoe64.graphview.series.DataPointInterface.getX()' on a null object reference at com.jjoe64.graphview.series.BaseSeries.getLowestValueX(BaseSeries.java:125) at com.jjoe64.graphview.Viewport.calcCompleteRange(Viewport.java:741) at com.jjoe64.graphview.GraphView.onDataChanged(GraphView.java:283) at com.jjoe64.graphview.Viewport.scrollToEnd(Viewport.java:1180) at com.jjoe64.graphview.series.BaseSeries.appendData(BaseSeries.java:484) at com.jjoe64.graphview.series.LineGraphSeries.appendData(LineGraphSeries.java:677) at com.jjoe64.graphview.series.BaseSeries.appendData(BaseSeries.java:502) at com.example.myapplication.exo_app.MainActivity$Thread2$1.run(MainActivity.java:418) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:224) at android.app.ActivityThread.main(ActivityThread.java:7560) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) I/Process: Sending signal. PID: 2918 SIG: 9

Based in my code in MainActivity.java:

if (data[7]%plot_freq==0) { series.appendData(new DataPoint(x, pitch_1),true,500); Log.v("Plot 1","OK"); } if (data_2[7]%plot_freq==0) { series_2.appendData(new DataPoint(x, pitch_2),true,500); Log.v("Plot 2","OK"); } if (data_3[7]%plot_freq==0) { series_3.appendData(new DataPoint(x, pitch_3),true,500); Log.v("Plot 3","OK"); }

It means that I got error before appending 3rd series. Has anyone has an idea?

Thanks,

Hey guys, i am really new in this and I have to make an app for a project in my school.. the thing is I am trying to put some Data in the GraphView but it´s not showing anything in the app.. I see the GraphView with default values only and my values don´t get shown in there.. i am using the bottom navigation tab and GraphView is in the home_fragment..so i made a public class (own file) under .ui.home and wrote this code : ` public class GraphActivity extends FragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_dashboard);

    GraphView graph = (GraphView) findViewById(R.id.graph);

    LineGraphSeries<DataPoint> series = new LineGraphSeries<>(new DataPoint[]{
            new DataPoint(0, 1),
            new DataPoint(1, 5),
            new DataPoint(2, 3),
            new DataPoint(3, 2),
            new DataPoint(4, 6)});
    graph.addSeries(series);

}

} ` i´m not getting any errors just the data is not being shown... thanks in advance

In GridLabelRenderer.adjustHorizontal the call to humanRound is hardwired to false for the second argument. This means that the increments between labels will always round down. That leads to data being truncated from the graph.

An easy way to see this is a one-line modification of the all-XML example given here. Replace the last line of

    <com.jjoe64.graphview.helper.GraphViewXML
        android:layout_width="match_parent"
        android:layout_height="100dip"
        app:seriesData="0=5;2=5;3=0;4=2" />

with

        app:seriesData="100=5;150=5;200=0;250=2" />

and you will see that the data, which runs from 100 to 250, is truncated at 180, hiding two of the four points.

There are several ways to address this I suppose, including

• Just hardwire the value to true. This may waste a little screen space, but should not hide data.
• Make the value user-configurable.
• Adjust both the step size and number of labels for a possibly better compromise.