MainActivity.java

package com.example.cameraphoto2;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

  Button takePicture;
	ImageView photo;

	final String IMAGEPATH = 
			Environment.getExternalStorageDirectory().getAbsolutePath() 
				+ "/tmp_image_new.jpg";
	
	final int REQUEST_TAKE_IMAGE = 1;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		takePicture = (Button) findViewById(R.id.takePicture);
		photo = (ImageView) findViewById(R.id.photo);
		
		
		takePicture.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				
				Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
				
				File file = new File(IMAGEPATH);
				Uri imageFileUri = Uri.fromFile(file);
				
				takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageFileUri);
				
				startActivityForResult(takePhotoIntent, REQUEST_TAKE_IMAGE);
			}
		});
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		
		switch (requestCode) {
			case REQUEST_TAKE_IMAGE:
				
				if(resultCode == Activity.RESULT_CANCELED){
					Toast.makeText(
							getApplicationContext(), 
							"No image was taken!", 
							Toast.LENGTH_SHORT
							).show();
					return;
				}
				
				Bitmap bitmap;
				
				BitmapFactory.Options options = new BitmapFactory.Options();
				
				options.inJustDecodeBounds = true;
				
				BitmapFactory.decodeFile(IMAGEPATH, options);
				
				int originalWidth = options.outWidth;
				int originalHeight = options.outHeight; // won't use this now
				
				int imageViewWidth = photo.getMeasuredWidth();
				
				int scaleFactor = Math.round(((float)originalWidth / (float)imageViewWidth));
				
				options.inJustDecodeBounds = false;
				options.inSampleSize = scaleFactor;
				
				// get downscaled bitmap
				bitmap = BitmapFactory.decodeFile(IMAGEPATH, options);
				
				// display the bitmap in the ImageView
				photo.setImageBitmap(bitmap);
				
				break;
	
			default:
				break;
		}
	}


}