Android UI How to - Draw text on Canvas








The following code shows how to Draw text on Canvas.

Example

Main layout xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

Main Activity Java code

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.os.Bundle;
import android.widget.ImageView;
/*from w  ww  .  ja v a  2 s.c o m*/
public class MainActivity extends Activity {

   @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);        
        
        Bitmap bitmap = Bitmap.createBitmap(300, 300, Bitmap.Config.RGB_565); 
        bitmap.eraseColor(Color.WHITE);
        Canvas canvas = new Canvas(bitmap); 
        
        Paint textPaint = new Paint(); 
        textPaint.setColor(Color.BLACK);
        textPaint.setTextSize(24);
        textPaint.setAntiAlias(true);
        textPaint.setTextAlign(Align.LEFT);
        
        canvas.drawText("Hello, Canvas!", 35F, 35F, textPaint);
        
        ImageView image = (ImageView) this.findViewById(R.id.imageView);        
        image.setImageBitmap(bitmap);        
    }
}
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