Bdtjtk

I have followed the MpAndroid Library for chart creation.I wanted to set Dynamic text on the center of the Pie chart .I am creating a BMI calculator ,so i wanted to display the BMI value inside the center of the Pie chart .
This is the code which i used to display the text inside the Pie chart .
`

        mChart.setDrawCenterText(true);

        mChart.setCenterTextTypeface(mTfLight);



        mChart.setCenterTextColor(Color.WHITE);

        mChart.setCenterTextSize(15f);

        mChart.setCenterText("BMI:"+bmi);

`

Please have a look at the full code .In the Oncreate() method i have set the above code for setting the text in the center but this is showing a static text , how to set the text inside the center dynamically (i.e. the calculated value of the BMI).????

MainActivity.java

    public class MainActivity extends AppCompatActivity

        implements NavigationView.OnNavigationItemSelectedListener {



    private RadioGroup radioSexGroup;

    private RadioButton radioSexButton;

    private int selectedId;

    private EditText age;

    private EditText height;

    private EditText weight;

    private TextView result;

    private Spinner height_spinner;

    private Spinner weight_spinner;

    private Button calculate;

    private PieChart mChart;



    String spinner_height; //Height Spinner

    String spinner_weight; //Weight Spinner

    String selected_item1;

    String selected_item2;



    float bmi=0f;



    protected String BMIcategory = new String

            {

            "Very Severly Underweight", "Severly Underweight", "Underweight", "Normal",

                    "Overweight", "Obese Class I", "Obese Class II", "Obese Class III",

    };









    protected Typeface mTfRegular;

    protected Typeface mTfLight;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

        setSupportActionBar(toolbar);

        setTitle("BMI Calculator");



        mTfRegular=Typeface.MONOSPACE;

        mTfLight = Typeface.MONOSPACE;

        radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);

        selectedId = radioSexGroup.getCheckedRadioButtonId();

        radioSexButton = (RadioButton) findViewById(selectedId);

        mChart=(PieChart)findViewById(R.id.chart);

        age=(EditText) findViewById(R.id.age);

        height=(EditText) findViewById(R.id.height);

        weight=(EditText) findViewById(R.id.weight);

//        result=(TextView) findViewById(R.id.result);

        height_spinner=(Spinner) findViewById(R.id.height_spinner);

        weight_spinner=(Spinner) findViewById(R.id.weight_spinner);

        calculate=(Button) findViewById(R.id.calculate_button);



        mChart.setBackgroundColor(Color.rgb(76,0,0));

//        moveOffScreen();

        mChart.setUsePercentValues(false);

        mChart.getDescription().setEnabled(false);



        mChart.setDrawCenterText(true);

        mChart.setCenterTextTypeface(mTfLight);



        mChart.setCenterTextColor(Color.WHITE);

        mChart.setCenterTextSize(15f);

        mChart.setCenterText("BMI:"+bmi);



        mChart.setDrawHoleEnabled(true);

        mChart.setHoleColor(Color.rgb(76,0,0));



        mChart.setTransparentCircleColor(Color.rgb(76,0,0));

        mChart.setTransparentCircleAlpha(110);



        mChart.setHoleRadius(65f);

        mChart.setTransparentCircleRadius(68f);

        mChart.setDrawSliceText(false);

        mChart.setDrawEntryLabels(false);



        mChart.setRotationEnabled(false);

        mChart.setHighlightPerTapEnabled(false);



        mChart.setMaxAngle(270f); // HALF CHART

        mChart.setRotationAngle(135f);

//        mChart.setRotation(180f);





//        mChart.setCenterTextOffset(0, -20);



        setData(8, 80);



        mChart.animateY(1400, Easing.EasingOption.EaseInOutQuad);

        mChart.getLegend().setEnabled(false);



        calculate.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                calculate();

            }

        });





        set_spinner();



    }



    private void setData(int count, float range) {



        ArrayList<PieEntry> values = new ArrayList<>();



        values.add(new PieEntry(10f,BMIcategory[0]));

        values.add(new PieEntry(15f,BMIcategory[1]));

        values.add(new PieEntry(8f,BMIcategory[2]));

        values.add(new PieEntry(12f,BMIcategory[3]));

        values.add(new PieEntry(5f,BMIcategory[4]));

        values.add(new PieEntry(5f,BMIcategory[5]));

        values.add(new PieEntry(15f,BMIcategory[6]));

        values.add(new PieEntry(10f,BMIcategory[7]));





        PieDataSet dataSet = new PieDataSet(values, "BMI Category");

        dataSet.setSliceSpace(1f);

        dataSet.setSelectionShift(5f);



        // add many colors

        ArrayList<Integer> colors = new ArrayList<Integer>();



        for (int c : ColorTemplate.VORDIPLOM_COLORS)

            colors.add(c);



        for (int c : ColorTemplate.JOYFUL_COLORS)

            colors.add(c);



        for (int c : ColorTemplate.COLORFUL_COLORS)

            colors.add(c);



        for (int c : ColorTemplate.LIBERTY_COLORS)

            colors.add(c);



        for (int c : ColorTemplate.PASTEL_COLORS)

            colors.add(c);



        colors.add(ColorTemplate.getHoloBlue());

        dataSet.setColors(colors);





        //dataSet.setSelectionShift(0f);



        PieData data = new PieData(dataSet);

        data.setDrawValues(false);



        mChart.setData(data);

        mChart.invalidate();

    }





    public void set_spinner(){



        ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(this, R.array.height_spinner_array, android.R.layout.simple_spinner_item);

        adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        height_spinner.setAdapter(adapter1);



        height_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

                int a = parent.getSelectedItemPosition();

                spinner_height = height_spinner.getSelectedItem().toString();

                if (a == 0) {

                    selected_item1="Meters";

                }

                if (a == 1) {

                    selected_item1="Inches";



                }

                if(a==2)

                {

                    selected_item1="Centimeters";

                }



            }



            @Override

            public void onNothingSelected(AdapterView<?> parent) {

                // Another interface callback

            }

        });





        ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.weight_spinner_array, android.R.layout.simple_spinner_item);

        adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        weight_spinner.setAdapter(adapter2);

        weight_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {

                int b = parent.getSelectedItemPosition();

               spinner_weight = weight_spinner.getSelectedItem().toString();

                if(b==0)

                {

                    selected_item2="Kgs";

                }

                if(b==1)

                {

                    selected_item2="Lbs";

                }

            }

            @Override

            public void onNothingSelected(AdapterView<?> parent) {} } );





    }



    public void calculate() {



        float getHeight, getWeight;



        DecimalFormat df = new DecimalFormat("#0.00");

//        for height in m and weight in kgs



        if (height.getText().toString().equals("")) {

            getHeight = 0f;

        } else {

            getHeight = Float.parseFloat(height.getText().toString());

        }

        if (weight.getText().toString().equals("")) {

            getWeight = 0f;

        } else {

            getWeight = Float.parseFloat(weight.getText().toString());

        }

        if(height.getText().toString().equals("") || weight.getText().toString().equals("") || age.getText().toString().equals(""))

        {

            Toast.makeText(this,"Please Enter All the Values",Toast.LENGTH_SHORT).show();

            return;

        }



        if(selected_item1.equals("Meters"))

        {

            if(selected_item2.equals("Kgs"))

            {

                bmi = getWeight / (getHeight * getHeight);



            }

            if(selected_item2.equals("Lbs"))

            {

                 bmi = (getWeight*0.453592f) / (getHeight * getHeight);

            }

        }

        if(selected_item1.equals("Inches"))

        {

            if(selected_item2.equals("Kgs"))

            {

                bmi = (getWeight*318.87517f) / (getHeight * getHeight);



            }

            if(selected_item2.equals("Lbs"))

            {

                bmi = (getWeight*703f) / (getHeight * getHeight);

            }



        }

        if(selected_item1.equals("Centimeters"))

        {

            if(selected_item2.equals("Kgs"))

            {

                 bmi = (getWeight*10000) / (getHeight * getHeight);

            }

            if(selected_item2.equals("Lbs"))

            {

                bmi=(getWeight*0.453592f*10000) / (getHeight * getHeight);

            }

        }

//        result.setText("Your BMI is " + df.format((double)bmi));







    }





    @Override

    public void onBackPressed() {

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);

        if (drawer.isDrawerOpen(GravityCompat.START)) {

            drawer.closeDrawer(GravityCompat.START);

        } else {

            super.onBackPressed();

        }

    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        // Handle action bar item clicks here. The action bar will

        // automatically handle clicks on the Home/Up button, so long

        // as you specify a parent activity in AndroidManifest.xml.

        int id = item.getItemId();



        //noinspection SimplifiableIfStatement

        if (id == R.id.action_settings) {

            return true;

        }



        return super.onOptionsItemSelected(item);

    }







}

One more thing i wanted to ask ,How do i decrease the width of the Slices of my Pie chart .There is a option to adjust the radius of the Inner circle ,but how do i adjust the width of the Slices .??

Any Kind of Help is most Welcome .Thanks !!

You have asked two questions:

how to set the text inside the center dynamically?

Just call again setCenterText and then invalidate method of Chart:

mChart.setCenterText("BMI:" + bmi);

mChart.invalidate();

How do i decrease the width of the Slices of my Pie chart

There is a method of PieChart:

setHoleRadius

You are using it incorrectly. It's parameter should a percent of the `PieChart' radius. So the call:

mChart.setHoleRadius(0.65f);

means, the hole should take 65% of chart radius.