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Compositeimage.java
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package com.paradigmcreatives.revision;
import java.io.FileNotFoundException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class RevisionActivity extends Activity implements OnClickListener {
static final int PICKED_ONE = 0;
static final int PICKED_TWO = 1;
boolean onePicked = false;
boolean twoPicked = false;
Button choosePicture1;
Button choosePicture2;
ImageView compositeImageView;
Bitmap bmp1;
Bitmap bmp2;
Canvas canvas;
Paint paint;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_revision);
choosePicture1 = (Button) findViewById(R.id.image1);
choosePicture2 = (Button) findViewById(R.id.image2);
compositeImageView = (ImageView) findViewById(R.id.composite);
choosePicture1.setOnClickListener(this);
choosePicture2.setOnClickListener(this);
}
public void onClick(View v) {
// TODO Auto-generated method stub
int which = -1;
if (v == choosePicture1) {
which = PICKED_ONE;
} else if (v == choosePicture2) {
which = PICKED_TWO;
}
Intent chooseIntent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(chooseIntent, which);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
Uri imageFileUri = data.getData();
if (requestCode == PICKED_ONE) {
bmp1 = loadBitmap(imageFileUri);
onePicked = true;
} else if (requestCode == PICKED_TWO) {
bmp2 = loadBitmap(imageFileUri);
twoPicked = true;
}
if(onePicked && twoPicked) {
Bitmap drawingBitmap = Bitmap.createBitmap(bmp1.getWidth(),
bmp1.getHeight(), bmp1.getConfig());
canvas = new Canvas(drawingBitmap);
paint = new Paint();
canvas.drawBitmap(bmp1, 0, 0, paint);
paint.setXfermode(new PorterDuffXfermode(android.graphics.
PorterDuff.Mode.MULTIPLY));
canvas.drawBitmap(bmp2, 0, 0, paint);
compositeImageView.setImageBitmap(drawingBitmap);
}
}
}
private Bitmap loadBitmap(Uri imageFileUri) {
Display currentDisplay = getWindowManager().getDefaultDisplay();
float dw = currentDisplay.getWidth();
float dh = currentDisplay.getHeight();
Bitmap returnBmp = Bitmap.createBitmap((int) dw, (int) dh,
Bitmap.Config.ARGB_4444);
try {
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
returnBmp = BitmapFactory.decodeStream(getContentResolver()
.openInputStream(imageFileUri), null, bmpFactoryOptions);
int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight / dh);
int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth / dw);
if (heightRatio > 1 && widthRatio > 1) {
if (heightRatio > widthRatio) {
bmpFactoryOptions.inSampleSize = heightRatio;
}
else {
bmpFactoryOptions.inSampleSize = widthRatio;
}
}
bmpFactoryOptions.inJustDecodeBounds = false;
returnBmp = BitmapFactory.decodeStream(getContentResolver().
openInputStream(imageFileUri), null, bmpFactoryOptions);
}
catch (FileNotFoundException e) {
Log.v("ERROR", e.toString());
}
return returnBmp;
}
}