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Androidplot error: Cannot resolve getGraphWidget and other method

I'm currently developing an Android application for a university stage.
This application has to draw a plot with data which are coming from some pressure sensor, to draw this plot I'm using Androidplot library.
I'm following this example on Andrloidplot docs to create a dynamic XYPlot and I have imported androidplot-core:1.1.0 in the project dependencies.
In the code editor I'm getting the "Cannot resolve .... method" error everytime I call getGraphWidget(), setRangeValueFormat() and when I try to access XYStepMode fields.
I have searched for this issue on internet and on Androidplot docs but I haven't find anything usefull.
I think that this is produced by some import that I have missed, but I'm not figuring out what I've forgotten.
Someone has already dealed with this problem and solved it?
Here's a part of my class where I get the first error occurrence, it is on the last line:
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.androidplot.Plot;
import com.androidplot.util.PixelUtils;
import com.androidplot.xy.XYSeries;
import com.androidplot.xy.*;
import java.text.DecimalFormat;
import java.util.Observable;
import java.util.Observer;
/**
* Created by marco on 07/09/16.
*/
public class GraphicChart extends Fragment {
private XYPlot dynamicPlot;
private MyPlotUpdater plotUpdater;
SampleDynamicXYDatasource data;
private Thread myThread;
public GraphicChart(){}
// redraws a plot whenever an update is received:
private class MyPlotUpdater implements Observer {
Plot plot;
public MyPlotUpdater(Plot plot) {
this.plot = plot;
}
#Override
public void update(Observable o, Object arg) {
plot.redraw();
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.graphic_chart_fragment, container, false);
// get handles to our View defined in layout.xml:
dynamicPlot = (XYPlot)getActivity().findViewById(R.id.dynamic_plot);
plotUpdater = new MyPlotUpdater(dynamicPlot);
// only display whole numbers in domain labels
dynamicPlot.getGraphWidget().setDomainValueFormat(new DecimalFormat("0")); //FIRST ERROR ON THIS LINE

Finally I've resolved it, I've compared sources from the site I've linked and the one on gitHub.
Here changes I've made:
lines
// only display whole numbers in domain labels
dynamicPlot.getGraphWidget().setDomainValueFormat(new DecimalFormat("0"));
are now
// only display whole numbers in domain labels
dynamicPlot.getGraph().getLineLabelStyle(XYGraphWidget.Edge.BOTTOM).
setFormat(new DecimalFormat("0"));
XYStepMode is now only StepMode
The call to dynamicPlot.setRangeValueFormat(new DecimalFormat("###.#")); is now done in this way
dynamicPlot.getGraph().getLineLabelStyle( XYGraphWidget.Edge.LEFT).setFormat(new DecimalFormat("###.#"));

Android: On Click gradual visibility change

I have got a little problem which is for me impossible to solve. I've got lots of TableRows called Radek_X and they are set to be android:visibility="gone".
And I need that if you for the first time, click on button(there is only one button for that process) it will change Radek_1 to android:visibility="visible" if you click on the button for the second time it will change Radek_2 from gone to visible, while Radek_1 is still visible. And so on for all others TableRows. I'm really desperate. I will be very grateful for any help! Have a nice day!
Here is my java file
package jansoldat.formular100;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TableRow;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
Button buttonPridejStaniceni;
TableRow Radek_2, Radek_3, Radek_4,Radek_5,Radek_6;
#Override
private ArrayList<String> arrayList;
private ArrayAdapter<String> adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonPridejStaniceni = (Button) findViewById(R.id.buttonPridejStaniceni);
Radek_2 = (TableRow) findViewById(R.id.Radek_2);
Radek_3 = (TableRow) findViewById(R.id.Radek_3);
Radek_4 = (TableRow) findViewById(R.id.Radek_4);
Radek_5 = (TableRow) findViewById(R.id.Radek_5);
Radek_6 = (TableRow) findViewById(R.id.Radek_6);
}
public void PridejDalsiStaniceniClicked(View v)
{
Radek_2.setVisibility(View.VISIBLE);
Radek_3.setVisibility(View.VISIBLE);
Radek_3.setVisibility(View.VISIBLE);
Radek_4.setVisibility(View.VISIBLE);
Radek_5.setVisibility(View.VISIBLE);
Radek_6.setVisibility(View.VISIBLE);
}
}
`

It's actually easier than you think, change your onClick method, which I assume you're setting by xml to PridejDalsiStaniceniClicked to this:
int[] views = new int[]{R.id.Radek_2,R.id.Radek_3,R.id.Radek_4};//...
int counter = 0;
public void PridejDalsiStaniceniClicked(View v)
{
findViewById(views[counter]).setVisibility(View.VISIBLE);
if(counter<views.length){
counter++;
}
}
What happens inside is that we will fetch the view that matches the counter of times pressed while there are still views in the array. Some people don't realize that view ids are integers and can be stored in an array like in the example.

Append TextView of another activity through main

I'm trying to create a game log, to show what happened on each round of the game. The log is in another activity but I want to be updated constantly with whatever the player does. A player just presses buttons that do certain things. It's too much code to post, but I have made a new bundle, and an intent.
In MainActivity.
Bundle bundle = new Bundle();
Intent GameLogSwitch = new Intent(getApplicationContext(),GameLog.class);
I am trying to put this to send to the other activity but I don't know if you can put variables in it. otherwise it works with simple words such as ("key","It works")
GameLogSwitch.putExtra("Break","---BREAK---"+"\n"+Player1Name+": "+GreenResult.getText()+"("+GrTop1+","+GrTop2+","+GrTop3+")"+"\n"+Player2Name+": "+RedResult.getText()+"("+RdTop1+","+RdTop2+","+RdTop3+")");
and then of course I have this when the gamelog button is pressed
startActivity(GameLogSwitch);
Now in Gamelog.class i have this.
package com.example.adam.snookerproject;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class GameLog extends AppCompatActivity {
private TextView GameLogText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_log);
GameLogText = (TextView) findViewById(R.id.GameLogText);
Intent GameLogSwitch = getIntent();
String myString = GameLogSwitch.getStringExtra("Break");
GameLogText.append(myString);
}
}
I have a couple of questions. First, why does append only work once with my string when I start the activity i.e when I go back and press the same button again it won't write the same thing again underneath?
Secondly, it doesn't seem to work for my "Break" key, does this have to do with the fact that there are variables in the text I'm sending? It only works for simple text like GameLogSwitch.putExtra("key","It works");
There must be an easier way to do this! Thank you.
UPDATE 1: The answer from Drv does seem to work, but when I try to do GameLogText.append(AppConstants.log) it just replaces everything in the textview no matter how many times I press the button. I think the activity is just resetting each time I start it again. Any way around this?

Make a global string in Constants class and use it wherever you want:
public class AppConstants{
public static String log="";
}
Edit the string in the class where you are sending it in intent:
AppConstants.log="---BREAK---"+"\n"+Player1Name+": "+GreenResult.getText()+"("+GrTop1+","+GrTop2+","+GrTop3+")"+"\n"+Player2Name+": "+RedResult.getText()+"("+RdTop1+","+RdTop2+","+RdTop3+")";
And use it in your class as:
package com.example.adam.snookerproject;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class GameLog extends AppCompatActivity {
private TextView GameLogText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game_log);
GameLogText = (TextView) findViewById(R.id.GameLogText);
//get your log here using AppConstants.log
}
}

Try to use getContext() instead of getApplicationContext, then check your string in debug mode

Use Callback or Interface. Fire the Interface from the Main Activity and Implement the call Interface in the Activity where you want the Textview to be Updated. Inside that method Update your Text View.
Read here More about Communication between Activity Activity and Fragment Activity

(Posted solution on behalf of the OP).
I managed to append using "\n"+AppConstants.log at the end of each output.

How can i create different pages without using activities

I'm trying to create an app that has different pages for topics and questions. I have created about two activites and am about to create more, like 40 activities. How can I do this without creating up to that number of activities?
Here is my MainActivity.java codes
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private ListView mListView;
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Declare the text view id
mListView = (ListView) findViewById(R.id.myList);
//Adding text to the array list
String booksArray[] = new String[]{"General Questions", "Mathematics",
"Physics",
"Chemistry",
"English"};
//Initialize the array list in the adapter
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout
.simple_list_item_1, booksArray);
mListView.setAdapter(adapter);
//Set the listener for the list view item
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
//if the position of item clicked is 1, it should open
//another activity
if(position == 1 ){
conditionOfIf();
}
else{
//A short message that notify user for an error
Toast.makeText(getApplicationContext(), "Please click on the first objcet",
Toast.LENGTH_LONG)
.show();}
}
});
}
//The real code that open another activity called Topics
private void conditionOfIf(){
Intent intent = new Intent(this, Topics.class);
startActivity(intent);
}
}

Fragments is your answer. your can create 40 fragments and have only one activity for managing that fragments.
And the best thing about fragments is that you can use the same UI for multiple purpose i.e reuse-ability which might come handy as you have large number of layouts.
i think this will be a great Fragment tutorial to start with,it is easy to understand yet powerful enough to teach you the fundamentals.

use fragments.
For learning fragments go to google or youtube videos.
There are many online sources available.

The child already has a parent

I know a lot of people asked this question but I'm not sure the solution for my problem is the same.
My code is:
package com.example.goo;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;
public class Calendrier extends Activity{
LinearLayout linear;
TextView text;
ScrollView SV;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SV = new ScrollView(this);
linear = new LinearLayout(this);
linear.setOrientation(LinearLayout.VERTICAL);
text = new TextView(this);
text.setText("This is an example for the Bright Hub !");
SV.addView(linear);
linear.addView(text);
setContentView(linear);
}
}
and the error is:
Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

You are doing mistake with setContentView because you already added linearLayout in view and you are trying to add second time which cause error,
Try this:
setContentView(SV);
Instead:
setContentView(linear);

Just
setContentView(linear); => setContentView(SV);
Hope it's help

I'm not sure, but I suppose you are getting this error on the last line (setContentView(linear);).
You first add that view linear to the scrollview SV, and then set it as the contentView.
I only know this error to come up when you add one view to another twice, but I suppose setting it as the contentview will work the same: it cannot be both a child of SV AND the root view.
Either set SV in setContentVieW, or don't add linear to that Scrollview