How to display a JPG in sdcard on ImageView

To display a JPG on ImageView, BitmapFactory.decodeFile() can be used.



But, in my experience, if I try to display a original photo in 10.0 million pixels by Nikon D80, the application will be stopped unexpectedly. So I have to use options.inSampleSize to reduce sample size.



In this exercise, the source (myJpgPath) of the JPG file is fixed, "/sdcard/DSC_3509.JPG". You have to modify to suit your own case.

Modify main.xml to have a TextView and ImageView to display files name and the photo.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<TextView  
    android:id="@+id/jpgname"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<ImageView  
    android:id="@+id/jpgview"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    />
</LinearLayout>

Modify the java file

package com.exercise.AndroidJpgView;

import java.io.File;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.TextView;

public class AndroidJpgView extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView jpgName = (TextView)findViewById(R.id.jpgname);
        ImageView jpgView = (ImageView)findViewById(R.id.jpgview);
        
        String myJpgPath = "/sdcard/DSC_3509.JPG"; //UPDATE WITH YOUR OWN JPG FILE
        
        jpgName.setText(myJpgPath);
        
        BitmapFactory.Options options = new BitmapFactory.Options();
  options.inSampleSize = 2;
  Bitmap bm = BitmapFactory.decodeFile(myJpgPath, options);
  jpgView.setImageBitmap(bm); 
    }
}

Download the files.

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