Android image converter code sharing

MainActivity. Java

package com.zhang.showPhoto;
 
import android.app.ActionBar.LayoutParams;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
 
public class MainActivity extends Activity {
   
  private int[] imagId=new int[]{
      R.drawable.img01,R.drawable.img02,R.drawable.img03,R.drawable.img04,
      R.drawable.img05,R.drawable.img06,R.drawable.img07,R.drawable.img08,
      R.drawable.img09,R.drawable.img10
    };
  private int index=0;
  private ImageSwitcher imageSwitcher;
  private Button up,down;
   
 
  @Override
  protected void onCreate(Bundle savedInstanceState) {
   
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
     
    up=(Button) findViewById(R.id.bt1);
    down=(Button) findViewById(R.id.bt2);
     
   
    imageSwitcher=(ImageSwitcher) findViewById(R.id.imagSw1);
    imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));
    imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));
    imageSwitcher.setFactory(new ViewFactory() {
       
     
      public View makeView() {
        ImageView imageView = new ImageView(MainActivity.this);
        imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
        imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
            LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT
            ));
        return imageView;
      }
    });
     
    imageSwitcher.setImageResource(imagId[index]);
     
    up.setOnClickListener(new OnClickListener() {
       
      @Override
      public void onClick(View v) {
        if(index>0){
          index--;
        }else{
          index=imagId.length-1;
        }
        imageSwitcher.setImageResource(imagId[index]);
      }
    });
     
    down.setOnClickListener(new OnClickListener() {
       
      @Override
      public void onClick(View v) {
        if(index<imagId.length-1){
          index++;
        }else{
          index=0;
        }
        imageSwitcher.setImageResource(imagId[index]);
      }
    });
   
  }
   
 
}

XML main.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:background="@drawable/bg1"
  android:id="@+id/llayout"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:gravity="center"
  android:orientation="horizontal" >
 
  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=" On one piece "
    android:id="@+id/bt1"
    />
  <ImageSwitcher
     android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/imagSw1"
    android:layout_gravity="center"
    />
   <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text=" The next "
    android:id="@+id/bt2"
    />
 
</LinearLayout>

Let's do another piece of code

    //Gets the width and height of the image
    BitmapFactory.Options opt = new BitmapFactory.Options();
    opt.inJustDecodeBounds = true;
    try{
      bitmapIn = BitmapFactory.decodeFile(Puzzle.user.CUSTOM_IMAGE[customImage], opt);
    }catch(Exception e){
      if(D) Log.d(TAG,"error");
      return;
    }
    int in_w=opt.outWidth,in_h=opt.outHeight;
     
    //Get the size of the imageview be careful that the aspect ratio of the imageview should be the same as the original image otherwise you need to calculate it separately
    full_w = imageview.getWidth()
    full_h = getHeight()
 
    //Calculate the scale with rounding
    int Size_rate=(in_w*in_h*10)/(full_w*full_h);
    if(Size_rate>10){
      Size_rate+=5; 
      Size_rate/=10;
    }else{
      Size_rate=1;
    }
 
    //Reset opt to read the image file
    opt.inSampleSize=Size_rate;
    opt.inJustDecodeBounds = false;
    opt.inScaled = false;
 
    opt.outWidth=full_w;
    opt.outHeight=full_h;
    bitmapIn = BitmapFactory.decodeFile(Puzzle.user.CUSTOM_IMAGE[customImage], opt);}