Write an application that draws basic graphical primitives.pptx
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This document describes how to create a simple Android application that draws basic graphical primitives on the screen. It involves setting up a new project in Android Studio, designing the layout with an ImageView, creating a Bitmap and Canvas object, and using the Canvas to draw a rectangle, circle, square, and line on the ImageView with different colors and positions. The code samples provided show how to set up the activity, draw the shapes to the Canvas, and display it in the ImageView.
Write an application that draws basic graphical primitives.pptx
- 1. Exp-5 Write an application that draws basic graphical primitives on the screen.
- 2. Aim: To develop a Simple Android Application that draws basic Graphical Primitives on the screen.
- 3. Creating a New project: Open Android Studio and then click on File -> New - > New project. Then type the Application name as “ex.no.5″ and click Next. Then select the Minimum SDK as shown below and click Next. Then select the Empty Activity and click Next. Finally click Finish. It will take some time to build and load the project.
- 4. Designing layout for the Android Application: Click on app -> res -> layout -> activity_main.xml. Now click on Text as shown below. Then delete the code which is there and type the code as given below.
- 5. Activity_main.xml: 1. <?xml version="1.0" encoding="utf-8"?> 2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res /android" 3. android:layout_width="match_parent" 4. android:layout_height="match_parent"> 5. 6. <ImageView 7. android:layout_width="match_parent" 8. android:layout_height="match_parent" 9. android:id="@+id/imageView" /> 10. </RelativeLayout>
- 6. Click on app -> java -> com.example.exno5 -> MainActivity. MainActivity.java: package com.example.exno5; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.drawable.BitmapDrawable; import android.os.Bundle; import android.widget.ImageView;
- 7. public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Creating a Bitmap Bitmap bg = Bitmap.createBitmap(720, 1280, Bitmap.Config.ARGB_8888); //Setting the Bitmap as background for the ImageView ImageView i = (ImageView) findViewById(R.id.imageView); i.setBackgroundDrawable(new BitmapDrawable(bg)); //Creating the Canvas Object Canvas canvas = new Canvas(bg); //Creating the Paint Object and set its color & TextSize Paint paint = new Paint(); paint.setColor(Color.BLUE); paint.setTextSize(50); //To draw a Rectangle canvas.drawText("Rectangle", 420, 150, paint); canvas.drawRect(400, 200, 650, 700, paint); //To draw a Circle canvas.drawText("Circle", 120, 150, paint); canvas.drawCircle(200, 350, 150, paint); //To draw a Square canvas.drawText("Square", 120, 800, paint); canvas.drawRect(50, 850, 350, 1150, paint); //To draw a Line canvas.drawText("Line", 480, 800, paint); canvas.drawLine(520, 850, 520, 1150, paint); } }