We can pick the Image thumb-nail from gallery using Intent.
Note : at the end of this Tutorial , you can find zip source code of this example .
There are two types of thumbnails available:
MINI_KIND: 512 x 384 thumbnail
MICRO_KIND: 96 x 96 thumbnail (Size is 18 or 36 kb depends on Devices)
1. We need to Create an Intent for pick Image from Gallery.
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
2. Override the method to get the result Image thumb-nail picked from Android Device.
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//Here is the place we got picked thumb-nail data
}
3. Get thumb-nail from Data result.
ContentResolver resolver = getContentResolver();
Uri actualUri = data.getData();
List uriPath = actualUri.getPathSegments();
long imageId = Long.parseLong(uriPath.get(uriPath.size() - 1));
Bitmap thumb = Thumbnails.getThumbnail(resolver, imageId,Thumbnails.MICRO_KIND, null);
4. Get thumb-nail Path.
private String getFilePath(Uri data){
String path = "";
path = data.getPath();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(data,filePathColumn, null, null, null);
if(cursor!=null){
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
path = cursor.getString(columnIndex);
cursor.close();
}
return path;
}
4. Rotate Thumb-nail if it’s required.
String thumbPath = getFilePath(actualUri);
ExifInterface exif;
try
{
exif = new ExifInterface(thumbPath);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 0);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
/*
Note: resultBitmap (I have declared in Class)
[private Bitmap resultBitmap = null;]
*/
if(resultBitmap != null)
{
Log.d("", "Recycling:resultBitmap");
resultBitmap.recycle();
resultBitmap =null;
}
//Create bitmap thumb-nail with perfect orientation
resultBitmap = Bitmap.createBitmap(thumb, 0, 0, thumb.getWidth(),thumb.getHeight(), matrix, true);
} catch (Exception e) {
e.printStackTrace();
}
5. Set the Result Image Thumb-nail Bitmap on ImageView
imageView.setImageBitmap(resultBitmap);
Note: What if Image doesn’t have Thumbnail.
I have handled it in sample code, we will get the image and create thumbnail.
We will create very simple app to do this work
-------------------------------------------
App Name: PickImageThumbnailFromGallery
Package Name: com.rdc. PickImageThumbnailFromGallery
Android SDK: Android SDK 2.2 / API 8
Default Activity Name: MainActivity.java
-------------------------------------------
MainActivity.java
package com.rdc.pickimagethumbnailfromgallery;
import java.util.List;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.media.ExifInterface;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Thumbnails;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private ImageView imageView = null;
private Button button = null;
private Bitmap bitmap = null;
private static final int PICK_IMAGE = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView1);
button = (Button) findViewById(R.id.button1);
button.setOnClickListener(this);
}
@Override
public void onClick(View arg0) {
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, PICK_IMAGE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
ContentResolver resolver = getContentResolver();
Uri actualUri = data.getData();
List uriPath = actualUri.getPathSegments();
long imageId = Long.parseLong(uriPath.get(uriPath.size() - 1));
Bitmap thumb = Thumbnails.getThumbnail(resolver, imageId,
Thumbnails.MICRO_KIND, null);
//There is no thumb-nail with this Image
if (thumb == null) {
// Log.d(TAG, "Failed to get thumb-nail for this image.");
Toast.makeText(getApplicationContext(),
"Failed to get thumbnail for our image.",
Toast.LENGTH_SHORT).show();
//so create thumb-nail from image itself
Cursor cursor = resolver
.query(actualUri,
new String[] { android.provider.MediaStore.Images.ImageColumns.DATA },
null, null, null);
cursor.moveToFirst();
final String imageFilePath = cursor.getString(0);
cursor.close();
imageView.setImageBitmap(this.createImageThumbnail(imageFilePath,
100, 100));
}
//We got the thumb-nail from gallery, rotate if needed else use on ImageView
else {
String thumbPath = getFilePath(actualUri);
ExifInterface exif;
try {
exif = new ExifInterface(thumbPath);
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION, 0);
Matrix matrix = new Matrix();
if (orientation == 6) {
matrix.postRotate(90);
} else if (orientation == 3) {
matrix.postRotate(180);
} else if (orientation == 8) {
matrix.postRotate(270);
}
if (bitmap != null) {
bitmap.recycle();
bitmap = null;
}
bitmap = Bitmap.createBitmap(thumb, 0, 0, thumb.getWidth(),
thumb.getHeight(), matrix, true);
if (thumb != bitmap) {
thumb.recycle();
thumb = null;
}
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
Bitmap createImageThumbnail(String imagePath, int width, int height) {
BitmapFactory.Options bmpFactoryOptions = new BitmapFactory.Options();
bmpFactoryOptions.inJustDecodeBounds = true;
int heightRatio = (int) Math.ceil(bmpFactoryOptions.outHeight
/ (float) height);
int widthRatio = (int) Math.ceil(bmpFactoryOptions.outWidth
/ (float) width);
if (heightRatio > 1 || widthRatio > 1) {
if (heightRatio > widthRatio) {
bmpFactoryOptions.inSampleSize = heightRatio;
} else {
bmpFactoryOptions.inSampleSize = widthRatio;
}
}
bmpFactoryOptions.inJustDecodeBounds = false;
if (bitmap != null) {
bitmap.recycle();
bitmap = null;
}
bitmap = BitmapFactory.decodeFile(imagePath, bmpFactoryOptions);
return bitmap;
}
private String getFilePath(Uri data) {
String path = "";
path = data.getPath();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(data, filePathColumn, null,
null, null);
if (cursor != null) {
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
path = cursor.getString(columnIndex);
cursor.close();
}
return path;
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="20dp"
android:src="@drawable/ic_launcher" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="PickImage" />
</LinearLayout>
ApplicatoinManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rdc.pickimagethumbnailfromgallery"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.rdc.pickimagethumbnailfromgallery.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
The output Screen will be like this..
Note: before click on upload image button make sure your Android Device is not connected with Computer.
Click to get thumbnail
You can download the complete source code zip file here : PickImageThumbnailFromGallery.Zip
