Example to create shadow frame for image

package com.example.androidframeimage;

import java.io.FileNotFoundException;

import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Rect;
import android.graphics.RectF;

public class MainActivity extends Activity {

 Button btnLoadImage1;
 TextView textSource1;
 Button btnProcessing;
 ImageView imageResult;
 
 final int RQS_IMAGE1 = 1;
 
 Uri source1;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  btnLoadImage1 = (Button)findViewById(R.id.loadimage1);
  textSource1 = (TextView)findViewById(R.id.sourceuri1);
  btnProcessing = (Button)findViewById(R.id.processing);
  imageResult = (ImageView)findViewById(R.id.result);
  
  btnLoadImage1.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View arg0) {
    Intent intent = new Intent(Intent.ACTION_PICK,
      android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
    startActivityForResult(intent, RQS_IMAGE1);
   }});
  
  btnProcessing.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    
    if(source1 != null){
     Bitmap processedBitmap = ProcessingBitmap();
     if(processedBitmap != null){
      imageResult.setImageBitmap(processedBitmap);
      Toast.makeText(getApplicationContext(), 
        "Done", 
        Toast.LENGTH_LONG).show();
     }else{
      Toast.makeText(getApplicationContext(), 
        "Something wrong in processing!", 
        Toast.LENGTH_LONG).show();
     }
    }else{
     Toast.makeText(getApplicationContext(), 
       "Select image!", 
       Toast.LENGTH_LONG).show();
    }
    
   }});
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  if(resultCode == RESULT_OK){
   switch (requestCode){
   case RQS_IMAGE1:
    source1 = data.getData();
    textSource1.setText(source1.toString());
    break;
   }
  }
 }
 
 private Bitmap ProcessingBitmap(){
  Bitmap bm1 = null;
  Bitmap newBitmap = null;
  Bitmap newShadowBitmap = null;
  
  try {
   bm1 = BitmapFactory.decodeStream(
     getContentResolver().openInputStream(source1));
   
   int w = bm1.getWidth();
   int h = bm1.getHeight();

   Config config = bm1.getConfig();
   if(config == null){
    config = Bitmap.Config.ARGB_8888;
   }
   
   newBitmap = Bitmap.createBitmap(w, h, config);
   Canvas newCanvas = new Canvas(newBitmap);
   newCanvas.drawColor(Color.BLACK);

   Paint paint = new Paint();
   paint.setColor(Color.WHITE);
   Rect frame = new Rect(
     (int)(w*0.05), 
     (int)(w*0.05), 
     (int)(w*0.95), 
     (int)(h*0.95));
   RectF frameF = new RectF(frame);
   newCanvas.drawRect(frameF, paint);
   paint.setXfermode(new PorterDuffXfermode(Mode.DARKEN));
   newCanvas.drawBitmap(bm1, 0, 0, paint);
   
   /*
    * Create shadow like outer frame
    */
   
   //create BLACK bitmap with same size of the image
   Bitmap bitmapFullGray = Bitmap.createBitmap(w, h, config);
   Canvas canvasFullGray = new Canvas(bitmapFullGray);
   canvasFullGray.drawColor(0xFF808080);
   
   //create bigger bitmap with shadow frame
   int shadowThick = 100;
   int shadowRadius = 50;
   newShadowBitmap = Bitmap.createBitmap(w+shadowThick+shadowRadius, 
     h+shadowThick+shadowRadius, config);
   Canvas newShadowCanvas = new Canvas(newShadowBitmap);
   newShadowCanvas.drawColor(Color.WHITE);
   
   //generate shadow
   Paint paintShadow = new Paint();
   paintShadow.setShadowLayer(shadowRadius, shadowThick, shadowThick, 0xFF000000);
   newShadowCanvas.drawBitmap(bitmapFullGray, 0, 0, paintShadow);
   
   //Place the image
   paintShadow.clearShadowLayer();
   newShadowCanvas.drawBitmap(newBitmap, 0, 0, paintShadow);
   
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  return newShadowBitmap;
 }

}

Layout refer to last exercise "Create frame on Bitmap image".

Download the files.

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more: Something about processing images in Android