Draw bar chart in android

This is the same as the Last Tutorial i have posted. We just need to implement the following code in the View instead of the last tutorial.


public class DrawBarChart extends View {
Paint paint = new Paint();
int c[] = { Color.BLUE, Color.RED };
Canvas mCanvas = new Canvas();
private float[] val_exp;
private float[] val_inco;
Context context;
WindowManager mWinMgr;

public DrawBarChart(Context context) {
super(context);
paint = new Paint();
super.draw(mCanvas);
}

public DrawBarChart(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
super.draw(mCanvas);
}

public DrawBarChart(Context context, float[] val_exp, float[] val_inco) {
super(context);
paint = new Paint();
this.val_exp = val_exp;
this.val_inco = val_inco;
super.draw(mCanvas);
}

public void draw(Canvas canvas) {
int x = getWidth();
int y = getHeight();
float max = getMax();
paint.setColor(Color.parseColor("#78777D"));
paint.setStyle(Style.STROKE);
paint.setStrokeWidth(2);
canvas.drawRect(0, 0, x - 1, y - 1, paint);
int n = val_exp.length;
int gap = x / 12;
paint.setStyle(Style.FILL);
for (int i = 0; i < n; i++) {

paint.setColor(Color.BLACK);
//Bottom Numbers 1 to 12.
canvas.drawText("" + (i + 1), i * gap + (gap / 2), y - 5, paint);    

//Vertical Lines.
canvas.drawLine((float) (i + 0.5) * gap + 4, y - 15,
(float) (i + 0.5) * gap + 4, y - 25, paint);    
            
// Blue bars for Income.
paint.setColor(Color.BLUE);
canvas.drawLine(i * gap + 5, y - 20, (float) (i + 0.5) * gap + 3,
y - 20, paint);

float bHeIn =(max==0)?y-20:  y - (val_inco[i] * (y - 22) / max)- 20;

canvas.drawRect((float) i   * gap + 5, bHeIn,
(float) (i + 0.5) * gap + 3, y - 20, paint);

// Red bars for Expenses.
paint.setColor(Color.RED);
canvas.drawLine((float) (i + 0.5) * gap + 5, y - 20,
(float) (i + 1) * gap + 3, y - 20, paint);

float bHeEx =(max==0)?y-20:  y - (val_exp[i] * (y - 22) / max)- 20;

canvas.drawRect((float) (i + 0.5) * gap + 5, bHeEx,
(float) (i + 1) * gap + 3, y - 20, paint);
}
}

private float getMax() {
float max = 0;
for (float f : val_exp) {
if (f > max)
max = f;
}
for (float f : val_inco) {
if (f > max)
max = f;
}
return max;
}
}

And for drawing the chart of the values of the data you need to pass the values to the objects of the class as follow.    


           DrawBarChart barView;
           LinearLayout la;

           barView = new DrawBarChart(this, vals_exp,vals_inco);
          la.addView(barView);

Draw PieChart in android using View

Fitst of all make an Relative layout as the below in your XML file to Display Pie chart on that view.

<RelativeLayout

       android:id="@+id/piechart_lay"
       android:layout_width="150dip"
       android:layout_height="150dip"
       android:layout_margin="5dip"
       android:background="#eeffee"
       android:orientation="horizontal" >
</RelativeLayout>


Now we have to make a View which make the actual pie chart and draw and fill the color in the chart. Create one file let's say DrawPieChart.java extends View and add the following code snippet in it.

public class DrawPieChart extends View {

Paint paint = new Paint();
        //  Here you can Add number of different color according to max different colors to be displayed on Piechart
        int c[] = {Color.MAGENTA,Color.BLUE,Color.RED,Color.CYAN,Color.YELLOW,Color.GREEN};
Canvas mCanvas = new Canvas();
private int[] values;
Context context;

public DrawPieChart(Context context, int[] values) {
super(context);
paint = new Paint();
this.values = values;
// this.labels = labels;
super.draw(mCanvas);
}

public void draw(Canvas canvas) {
int x = getWidth();
int y = getHeight();
float t = getTotal();
paint.setColor(Color.parseColor("#78777D"));
paint.setStyle(Style.STROKE);
paint.setStrokeWidth(2);
canvas.drawRect(0, 0, x - 1, y - 1, paint);
int n = values.length;
float cuurPos = -90;
paint.setStyle(Style.FILL);
RectF rect = new RectF(20,20,x-20,y-20);
for (int i = 0; i < n; i++) {
paint.setColor(c[i]);
float thita =(t==0)?0: 360*values[i]/t;
canvas.drawArc(rect, cuurPos, thita, true, paint);
cuurPos = cuurPos+thita;
}
}

private float getTotal() {
int total = 0;
for (int i = 0; i < values.length; i++) {
total = total + values[i];
}
return total;
}
}

Now create an object of this class in your activity and pass the Array of the values to the object and it will create the Piechart in the Relative layout. You have to add this view in the Activity to your relative layout.


class Piechart extends Activity{


        RelativeLayout la;
DrawPieChart piView;
        int[] vals;


       @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.relative);
                la = (RelativeLayout) findViewById(R.id.pie_lay);
                getPieChart();
        }
        
        public void  getPieChart(){
             vals[] = new vals[YOUR SIZE OF ARRAY];
             vals = {12,14,23,35,23,56,78};
             piView = new DrawPieChart(Analisys.this, vals);
             
             la.removeAllViews();
     la.addView(piView); 
       }
}