Draw Path on canvas of custom View

This example show drawing Path of circle on canvas of custom View, user can adjust its ratio using twh SeekBar. It will be the base of coming exercises.

MainActivity.java

package com.example.androiddrawpath;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity {

 SeekBar radiusBar;
 MyView myView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  radiusBar = (SeekBar) findViewById(R.id.radiusbar);
  myView = (MyView) findViewById(R.id.myview);
  float defaultRatio = (float) (radiusBar.getProgress())
    / (float) (radiusBar.getMax());
  myView.setShapeRadiusRatio(defaultRatio);

  radiusBar.setOnSeekBarChangeListener(radiusBarOnSeekBarChangeListener);

 };

 OnSeekBarChangeListener radiusBarOnSeekBarChangeListener = 
  new OnSeekBarChangeListener() {

  @Override
  public void onProgressChanged(SeekBar seekBar, int progress,
    boolean fromUser) {
   float defaultRatio = (float) (radiusBar.getProgress())
     / (float) (radiusBar.getMax());
   myView.setShapeRadiusRatio(defaultRatio);
   myView.invalidate();
  }

  @Override
  public void onStartTrackingTouch(SeekBar seekBar) {
  }

  @Override
  public void onStopTrackingTouch(SeekBar seekBar) {
  }

 };

}

MyView.java, our custom View.

package com.example.androiddrawpath;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Path.Direction;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {
 
 MyShape myShape;
 float ratioRadius;

 public MyView(Context context) {
  super(context);
  initMyView();
 }

 public MyView(Context context, AttributeSet attrs) {
  super(context, attrs);
  initMyView();
 }

 public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  initMyView();
 }
 
 public void initMyView(){
  myShape = new MyShape();
 }
 
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  
  int w = getWidth();
  int h = getHeight();
  
  if((w==0) || (h==0)){
   return;
  }
  
  float x = (float)w/2.0f;
  float y = (float)h/2.0f;
  float radius;
  if(w > h){
   radius = h * ratioRadius;
  }else{
   radius = w * ratioRadius;
  }
  
  myShape.setCircle(x, y, radius, Direction.CCW);
  canvas.drawPath(myShape.getPath(), myShape.getPaint());
 }
 
 public void setShapeRadiusRatio(float ratio){
  ratioRadius = ratio;
 }

}

MyShape.java, it is the object hold the Path and Paint to be drawn on our View.

package com.example.androiddrawpath;

import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;

public class MyShape {

 private Paint paint;
 private Path path;

 public MyShape() {
  paint = new Paint();
  paint.setColor(Color.BLUE);
  paint.setStrokeWidth(3);
  paint.setStyle(Paint.Style.STROKE);
  
  path = new Path();
 }

 public void setCircle(float x, float y, float radius, Path.Direction dir){
  path.reset();
  path.addCircle(x, y, radius, dir);
 }
 
 public Path getPath(){
  return path;
 }
 
 public Paint getPaint(){
  return paint;
 }
 
}

Layout, /res/layout/activity_main.xml.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.androiddrawpath.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    
    <TextView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content" 
        android:text="radius(%)"/>
    <SeekBar 
        android:id="@+id/radiusbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        android:progress="50" />
    
    <com.example.androiddrawpath.MyView 
        android:id="@+id/myview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

Download the files.


More example:

• Draw Path of polygon on canvas of custom View
• Controlling Hardware Acceleration of individual View by calling setLayerType() method
• Draw star on canvas
• Draw rounded corner star on canvas
• Fill path with color
• Rotate Path with Matrix
• Draw rotated path by rotating canvas
• DashPathEffect, apply dash effect on path
• Implement running dash path, using PathDashPathEffect
• Implement arrow-like PathDashPathEffect
• Animation of moving bitmap along path
• Smooth turning along path
• Animation follow touch path
• Know the performance, timing and speed of animation
• Change speed of Animation follow touch path
• Animation follow touch path forward and backward