Image Processing with open JPG file dialog

In the former articles in my "Image processing" series, the source image is preset. With the example of "JPG File Chooser", a dialog to load jpg file is added. User can select image to be processed, by touching on MENU and Load jpg.

Please notice that it is a heavy memory needed processing, may be you will get OutOfMemoryError!

Modify from the former article "Unsharp Mask (USM) on Android Image Processing".

Create /res/layout/load_dialog.xml to define the layout of the Load JPG dialog.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/customdialog"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="20dp"
    android:minWidth="300dp">
    <LinearLayout 
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp">
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher"/>
        <Button
            android:id="@+id/up"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Parent folder"/>
    </LinearLayout>

 <TextView
     android:id="@+id/folder"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <ListView
        android:id="@+id/dialoglist"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

Main code, AndroidImageProcessingActivity.java.

package com.AndroidImageProcessing;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.Dialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.MimeTypeMap;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class AndroidImageProcessingActivity extends Activity {
 
 //for Load JPG dialog
 Button buttonUp;
 static final int LOAD_DIALOG_ID = 0;
 TextView textFolder;
 ListView dialog_ListView;
 private List<String> fileList = new ArrayList<String>();
 
 File root;
 File curFolder;
 
 final static int KERNAL_WIDTH = 3;
 final static int KERNAL_HEIGHT = 3;

 int[][] kernal_blur = {
   {1, 1, 1},
   {1, 1, 1},
   {1, 1, 1}
 };
 
 final static int DIV_BY_9 = 9;
 
 ImageView imageSource, imageAfter;
 Bitmap bitmap_Source;
 ProgressBar progressBar;
 
 private Handler handler;
 Bitmap afterProcess;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        imageSource = (ImageView)findViewById(R.id.imageSource);
        imageAfter = (ImageView)findViewById(R.id.imageAfter);
        progressBar = (ProgressBar)findViewById(R.id.progressBar);
        progressBar.setVisibility(View.GONE);
        
        bitmap_Source = BitmapFactory.decodeResource(getResources(), R.drawable.testpicture);

        handler = new Handler();
        //performImageProcessing(bitmap_Source);
        
        root = new File(Environment
          .getExternalStorageDirectory()
          .getAbsolutePath());
        
        curFolder = root;
    }
    
    private void performImageProcessing(Bitmap bmSrc){
     imageSource.setImageBitmap(bmSrc);
     progressBar.setVisibility(View.VISIBLE);
  imageAfter.setVisibility(View.GONE);
     StratBackgroundProcess(bmSrc);
    }
    
    private void StratBackgroundProcess(final Bitmap bm_src){
     
     Runnable runnable = new Runnable(){

   @Override
   public void run() {
    afterProcess = processingBitmap(bm_src, kernal_blur);
    handler.post(new Runnable(){

     @Override
     public void run() {
      progressBar.setVisibility(View.GONE);
      imageAfter.setVisibility(View.VISIBLE);
      imageAfter.setImageBitmap(afterProcess);
     }
     
    });
   }
     };
     new Thread(runnable).start();
    }
    
    private Bitmap processingBitmap(Bitmap src, int[][] knl){
     Bitmap dest = Bitmap.createBitmap(
       src.getWidth(), src.getHeight(), src.getConfig());
     
     int bmWidth = src.getWidth();
     int bmHeight = src.getHeight();
     int bmWidth_MINUS_2 = bmWidth - 2;
     int bmHeight_MINUS_2 = bmHeight - 2;
     int bmWidth_OFFSET_1 = 1;
     int bmHeight_OFFSET_1 = 1;
     
     for(int i = bmWidth_OFFSET_1; i <= bmWidth_MINUS_2; i++){
      for(int j = bmHeight_OFFSET_1; j <= bmHeight_MINUS_2; j++){
       
       //get the surround 7*7 pixel of current src[i][j] into a matrix subSrc[][]
       int[][] subSrc = new int[KERNAL_WIDTH][KERNAL_HEIGHT];
       for(int k = 0; k < KERNAL_WIDTH; k++){
        for(int l = 0; l < KERNAL_HEIGHT; l++){
         subSrc[k][l] = src.getPixel(i-bmWidth_OFFSET_1+k, j-bmHeight_OFFSET_1+l);
        }
       }
       
       //subSum = subSrc[][] * knl[][]
       long subSumA = 0;
       long subSumR = 0;
       long subSumG = 0;
       long subSumB = 0;

       for(int k = 0; k < KERNAL_WIDTH; k++){
        for(int l = 0; l < KERNAL_HEIGHT; l++){
         subSumA += (long)(Color.alpha(subSrc[k][l])) * (long)(knl[k][l]);
         subSumR += (long)(Color.red(subSrc[k][l])) * (long)(knl[k][l]);
         subSumG += (long)(Color.green(subSrc[k][l])) * (long)(knl[k][l]);
         subSumB += (long)(Color.blue(subSrc[k][l])) * (long)(knl[k][l]);
        }
       }
       
       subSumA = subSumA/DIV_BY_9;
       subSumR = subSumR/DIV_BY_9;
       subSumG = subSumG/DIV_BY_9;
       subSumB = subSumB/DIV_BY_9;
       
       int orgColor = src.getPixel(i, j);
       int orgA = Color.alpha(orgColor);
       int orgR = Color.red(orgColor);
       int orgG = Color.green(orgColor);
       int orgB = Color.blue(orgColor);
       
       subSumA = orgA + (orgA - subSumA);
       subSumR = orgR + (orgR - subSumR);
       subSumG = orgG + (orgG - subSumG);
       subSumB = orgB + (orgB - subSumB);

       if(subSumA <0){
        subSumA = 0;
       }else if(subSumA > 255){
        subSumA = 255; 
       }
       
       if(subSumR <0){
        subSumR = 0;
       }else if(subSumR > 255){
        subSumR = 255; 
       }
       
       if(subSumG <0){
        subSumG = 0;
       }else if(subSumG > 255){
        subSumG = 255;
       }
       
       if(subSumB <0){
        subSumB = 0;
       }else if(subSumB > 255){
        subSumB = 255;
       }

       dest.setPixel(i, j, Color.argb(
         (int)subSumA, 
         (int)subSumR, 
         (int)subSumG, 
         (int)subSumB));
      } 
     }
     
     return dest;
    }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  menu.add(0, 0, 0, "Load jpg");
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  switch(item.getItemId()){
  case (0):
   showDialog(LOAD_DIALOG_ID);
   break;
  }
  return true;
 }

 @Override
 protected Dialog onCreateDialog(int id) {

  Dialog dialog = null;
  
  switch(id) {
     case LOAD_DIALOG_ID:
      dialog = new Dialog(AndroidImageProcessingActivity.this);
      dialog.setContentView(R.layout.load_dialog);
      dialog.setTitle("Load JPG");
      
      dialog.setCancelable(true);
      dialog.setCanceledOnTouchOutside(true);
      
      textFolder = (TextView)dialog.findViewById(R.id.folder);

      buttonUp = (Button)dialog.findViewById(R.id.up);
      buttonUp.setOnClickListener(new OnClickListener(){

    @Override
    public void onClick(View v) {
     // TODO Auto-generated method stub
     ListDir(curFolder.getParentFile());
    }});

      //Prepare ListView in dialog
      dialog_ListView = (ListView)dialog.findViewById(R.id.dialoglist);

      dialog_ListView.setOnItemClickListener(new OnItemClickListener(){

    @Override
    public void onItemClick(AdapterView<?> parent, View view,
      int position, long id) {
     
     File selected = new File(fileList.get(position));
     if(selected.isDirectory()){
      ListDir(selected); 
     }else {
      Toast.makeText(AndroidImageProcessingActivity.this,
        selected.toString() + " selected",
        Toast.LENGTH_LONG).show();
      dismissDialog(LOAD_DIALOG_ID);
      
      Bitmap bm = BitmapFactory.decodeFile(selected.getAbsolutePath());
      imageSource.setImageBitmap(bm);
            performImageProcessing(bm);
        }
     
    }});
      
         break;
     }

  return dialog;
 }

 @Override
 protected void onPrepareDialog(int id, Dialog dialog, Bundle bundle) {
  // TODO Auto-generated method stub
  super.onPrepareDialog(id, dialog, bundle);

  switch(id) {
     case LOAD_DIALOG_ID:
      ListDir(curFolder);
         break;
     }
  
 }
 
 void ListDir(File f){

  if(f.equals(root)){
   buttonUp.setEnabled(false);
  }else{
   buttonUp.setEnabled(true);
  }
  
  curFolder = f;
  textFolder.setText(f.getPath());
  
  File[] files = f.listFiles();
  fileList.clear();
  for (File file : files){
   
   if(file.isDirectory()){
    fileList.add(file.getPath());
   }else{
    Uri selectedUri = Uri.fromFile(file);
    String fileExtension
     = MimeTypeMap.getFileExtensionFromUrl(selectedUri.toString());
    if(fileExtension.equalsIgnoreCase("jpg")){
     fileList.add(file.getPath());
    }
   }
   
  }
       
  ArrayAdapter<String> directoryList
   = new ArrayAdapter<String>(this,
     android.R.layout.simple_list_item_1, fileList);
  dialog_ListView.setAdapter(directoryList);
 }

}

Main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    
    <HorizontalScrollView
     android:layout_width="wrap_content"
     android:layout_height="wrap_content">
     <ScrollView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content">
         <LinearLayout 
             android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:orientation="vertical" >
          <TextView
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:text="Original" />
       <ImageView
           android:id="@+id/imageSource" 
           android:layout_width="wrap_content"
           android:layout_height="wrap_content" 
           android:scaleType="center"/>
       <TextView
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:text="Result" />
       <FrameLayout 
           android:layout_width="wrap_content"
           android:layout_height="wrap_content">
           <ImageView
               android:id="@+id/imageAfter" 
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:scaleType="center"/>
           <ProgressBar
               android:id="@+id/progressBar"
               style="?android:attr/progressBarStyleLarge"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"/>
       </FrameLayout>
      
      </LinearLayout>
     </ScrollView>
 </HorizontalScrollView>

</LinearLayout>