Modify MainActivity.java from Last post to fine tune bitmap after scaled.
package com.test.androidimageprocessing;
import java.io.FileNotFoundException;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.example.androidimageprocessing.R;
public class MainActivity extends Activity {
Button btnLoadImage1, btnLoadImage2;
TextView textSource1, textSource2;
Button btnProcessing;
ImageView imageResult;
Spinner spinnerMode;
final int RQS_IMAGE1 = 1;
final int RQS_IMAGE2 = 2;
Uri source1, source2;
String[] arrayModeName = { "ADD", "CLEAR", "DARKEN", "DST", "DST_ATOP",
"DST_IN", "DST_OUT", "DST_OVER", "LIGHTEN", "MULTIPLY", "OVERLAY",
"SCREEN", "SRC", "SRC_ATOP", "SRC_IN", "SRC_OUT", "SRC_OVER", "XOR" };
/*
* To use Mode.ADD and Mode.OVERLAY, android:minSdkVersion have to be set
* "11" or higher.
*/
PorterDuff.Mode[] arrayMode = { Mode.ADD, Mode.CLEAR, Mode.DARKEN,
Mode.DST, Mode.DST_ATOP, Mode.DST_IN, Mode.DST_OUT, Mode.DST_OVER,
Mode.LIGHTEN, Mode.MULTIPLY, Mode.OVERLAY, Mode.SCREEN, Mode.SRC,
Mode.SRC_ATOP, Mode.SRC_IN, Mode.SRC_OUT, Mode.SRC_OVER, Mode.XOR };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnLoadImage1 = (Button) findViewById(R.id.loadimage1);
btnLoadImage2 = (Button) findViewById(R.id.loadimage2);
textSource1 = (TextView) findViewById(R.id.sourceuri1);
textSource2 = (TextView) findViewById(R.id.sourceuri2);
btnProcessing = (Button) findViewById(R.id.processing);
imageResult = (ImageView) findViewById(R.id.result);
spinnerMode = (Spinner) findViewById(R.id.mode);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
MainActivity.this, android.R.layout.simple_spinner_item,
arrayModeName);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerMode.setAdapter(adapter);
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);
}
});
btnLoadImage2.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_IMAGE2);
}
});
btnProcessing.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (source1 != null && source2 != 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 both 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;
case RQS_IMAGE2:
source2 = data.getData();
textSource2.setText(source2.toString());
break;
}
}
}
private Bitmap ProcessingBitmap() {
Bitmap bm1 = null;
Bitmap bm2 = null;
Bitmap newBitmap = null;
try {
/*
* bm1 = BitmapFactory.decodeStream(getContentResolver()
* .openInputStream(source1));
* bm2 = BitmapFactory.decodeStream(getContentResolver()
* .openInputStream(source2));
*/
bm1 = loadScaledBitmap(source1);
Toast.makeText(getApplicationContext(),
"bm1: " + bm1.getWidth() + " x " + bm1.getHeight(),
Toast.LENGTH_LONG).show();
bm2 = loadScaledBitmap(source2);
Toast.makeText(getApplicationContext(),
"bm2: " + bm2.getWidth() + " x " + bm2.getHeight(),
Toast.LENGTH_LONG).show();
int w;
if (bm1.getWidth() >= bm2.getWidth()) {
w = bm1.getWidth();
} else {
w = bm2.getWidth();
}
int h;
if (bm1.getHeight() >= bm2.getHeight()) {
h = bm1.getHeight();
} else {
h = bm2.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.drawBitmap(bm1, 0, 0, null);
Paint paint = new Paint();
int selectedPos = spinnerMode.getSelectedItemPosition();
PorterDuff.Mode selectedMode = arrayMode[selectedPos];
paint.setXfermode(new PorterDuffXfermode(selectedMode));
newCanvas.drawBitmap(bm2, 0, 0, paint);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return newBitmap;
}
private Bitmap loadScaledBitmap(Uri src) throws FileNotFoundException {
// required max width/height
final int REQ_WIDTH = 1024;
final int REQ_HEIGHT = 1024;
Bitmap bm = null;
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(getContentResolver().openInputStream(src),
null, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, REQ_WIDTH,
REQ_HEIGHT);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeStream(
getContentResolver().openInputStream(src), null, options);
/*
* Up to here, bm will be scaled down, but not exactly expected size!
*
* To fine tune the size, re-create another bitmap from this scaled bitmap
* using Bitmap.createScaledBitmap() method with expected width and height.
*/
final int LONGEST_LENGTH = 1024;
int dstWidth, dstHeight;
if(options.outWidth >= options.outHeight){
//Landscape orientation
dstWidth = LONGEST_LENGTH;
dstHeight = LONGEST_LENGTH * options.outHeight/options.outWidth;
}else{
//portrait orientation
dstHeight = LONGEST_LENGTH;
dstWidth = LONGEST_LENGTH * options.outWidth/options.outHeight;
}
//To save memory, re-use bm
bm = Bitmap.createScaledBitmap(bm, dstWidth, dstHeight, false);
return bm;
}
private int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
Toast.makeText(getApplicationContext(),
"inSampleSize: " + inSampleSize, Toast.LENGTH_LONG).show();
return inSampleSize;
}
}
Download the files.more: Something about processing images in Android
