Example to draw text on Bitmap.
package com.example.androidimageview;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.SeekBar;
public class MainActivity extends ActionBarActivity {
SeekBar textSizeBar;
ImageView image1, image2;
Button btnDrawText;
EditText textIn;
Bitmap bitmapOriginal;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textSizeBar = (SeekBar) findViewById(R.id.textsize);
btnDrawText = (Button) findViewById(R.id.drawtext);
textIn = (EditText) findViewById(R.id.textin);
image1 = (ImageView) findViewById(R.id.image1);
image2 = (ImageView) findViewById(R.id.image2);
bitmapOriginal = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
image1.setImageBitmap(bitmapOriginal);
btnDrawText.setOnClickListener(btnDrawTextOnClickListener);
ReloadImage();
}
OnClickListener btnDrawTextOnClickListener = new OnClickListener(){
@Override
public void onClick(View v) {
ReloadImage();
}};
private void ReloadImage() {
int textSize = textSizeBar.getProgress();
String textToDraw = textIn.getText().toString();
Bitmap newBitmap = bitmapOriginal.copy(bitmapOriginal.getConfig(), true);
Canvas newCanvas = new Canvas(newBitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.RED);
paint.setTextSize(textSize);
Rect bounds = new Rect();
paint.getTextBounds(textToDraw, 0, textToDraw.length(), bounds);
int x = 0;
int y = newBitmap.getHeight();
newCanvas.drawText(textToDraw, x, y, paint);
image1.setImageBitmap(newBitmap);
image2.setImageBitmap(newBitmap);
}
}
<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:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.androidimageview.MainActivity" >
<TextView
android:id="@+id/title"
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" />
<EditText
android:id="@+id/textin"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<SeekBar
android:id="@+id/textsize"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="50"
android:progress="10" />
<Button
android:id="@+id/drawtext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Draw text on bitmap" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="@+id/image1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/image2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#D0D0D0" />
</LinearLayout>
</LinearLayout>
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