Develop Reference

How to get Image(bitmap) from gridView

I have gridView that load images from sdcard/dcim/camera and shows them.
I want to put onclick listener on images and when I click on one it shoudl open that picture in other activity. How can I get image from gridView when I click on it.
error is on this line:
intent.putExtra("image", item.getImage());
how can I fix this or how else can I make it work ?
public class MainActivity extends Activity {
ImageAdapter myImageAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridView);
myImageAdapter = new ImageAdapter(this);
gridview.setAdapter(myImageAdapter);
gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
ImageItem item = (ImageItem) parent.getItemAtPosition(position);
//Create intent
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
intent.putExtra("image", item.getImage()); // ERROR IS ON ITEM.GETIMAGE
//Start details activity
startActivity(intent);
}
});
String ExternalStorageDirectoryPath = Environment
.getExternalStorageDirectory()
.getAbsolutePath();
String targetPath = ExternalStorageDirectoryPath + "/DCIM/Camera/";
Toast.makeText(getApplicationContext(), targetPath, Toast.LENGTH_LONG).show();
File targetDirector = new File(targetPath);
File[] files = targetDirector.listFiles();
for (File file : files){
myImageAdapter.add(file.getAbsolutePath());
}
}
}
//*****************************************/
public class ImageItem {
private Bitmap image;
private String title;
public ImageItem(Bitmap image ) {
super();
this.image = image;
}
public Bitmap getImage() {
return image;
}
public void setImage(Bitmap image) {
this.image = image;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
//****************************************************/
public class ImageAdapter extends BaseAdapter {
private Context mContext;
ArrayList<String> itemList = new ArrayList<String>();
public ImageAdapter(Context c) {
mContext = c;
}
void add(String path){
itemList.add(path);
}
#Override
public int getCount() {
return itemList.size();
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(220, 220));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView) convertView;
}
Bitmap bm = decodeSampledBitmapFromUri(itemList.get(position), 220, 220);
imageView.setImageBitmap(bm);
return imageView;
}
public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {
Bitmap bm = null;
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(path, options);
return bm;
}
public 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) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
}
//***********************************************/
public class DetailsActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.details_activity);
Bitmap bitmap = getIntent().getParcelableExtra("image");
ImageView imageView = (ImageView) findViewById(R.id.image1);
imageView.setImageBitmap(bitmap);
}
}
//*******************************************************/
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#f0f0f0">
<GridView
android:id="#+id/gridView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:columnWidth="150dp"
android:drawSelectorOnTop="true"
android:gravity="center"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="5dp"
android:focusable="true"
android:clickable="true"/>
</RelativeLayout>
//*************************************************/
details_activity.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#000">
<ImageView
android:id="#+id/image1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:scaleType="fitCenter" />
</FrameLayout>

It is bad practice to pass bitmaps between activities.
The logical thing to do would be to pass the image path to the next activity and then decode the image in that activity based on the image view dimensions.
I hope this was helpful. :)

Gridview with notifications for each item over it

My application is something that is having some categories, I am showing these categories in a grid view,I was successful in doing that.However later, I felt that I have a need to show notifications for each of the categories like the following:
I was thinking that I will have to take a hidden view component for the notification count for each category, that I will need to show up only whenever there is a notification received regarding that category.But the thing is that it may happen that I may be receiving notifications of various categories simultaneously and hence I will need to call notifyDataSetChanged(),(dont know my approach is right or not) each time to show up the notification count.(which may be a costlier process)
I want to know that how can I implement this gridview with notifications functionality efficiently, What if I want that the notification pops up with some animation, like the second bubble in the image,(and how to do that).
Framelayout in GridView seems to be the solution but it will be best if some example similar to that is shown to me.
I am also unsure about the approach I am thinking of.Is it a valid approach or some alternatives are there.
Here is my GridView:
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="7dp"
android:paddingRight="7dp"
android:layout_marginTop="5dp"
android:verticalSpacing="2dp"
android:horizontalSpacing="2dp"
android:scrollingCache="true"
android:smoothScrollbar="true"
android:clipChildren="true"
android:alwaysDrawnWithCache="true"
android:numColumns="auto_fit"
android:columnWidth="100dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:background="#000000">
</GridView>
The Adapter class:
class ImageAdapterTabView extends BaseAdapter {
private Context context;
ArrayList<String> imageList = new ArrayList<String>();
public ImageAdapterTabView(Context c) {
context = c;
}
void add(String path){
imageList.add(path);
}
#Override
public int getCount() {
return imageList.size();
}
#Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(350, 350));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setAdjustViewBounds(true);
// imageView.setPadding(5, 5, 5, 5);
} else {
imageView = (ImageView) convertView;
}
Bitmap bm = decodeSampledBitmapFromUri(imageList.get(position), 100, 100);
imageView.setImageBitmap(bm);
return imageView;
}
public Bitmap decodeSampledBitmapFromUri(String path, int reqWidth, int reqHeight) {
Bitmap bm = null;
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(path, options);
return bm;
}
public int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
}

you should have to do following step
create layout for grid item
take relative layount with image and textview(top corner)
also create custom list
now you have to change as per item visibility of textview hide and show

Register each view as observer for the event..When the event happens you can show the notification.You would not need to do notifyDataSetChanged() everytime.However be careful of not leaking view objects.
To learn more about observe pattern refer-https://en.wikipedia.org/wiki/Observer_pattern

ImageView size is not displayed correctly

I'm having a problem of displaying ImageViews with the correct size. Almost all the posts that I've read through involves ImageViews that are created in the layout file. However in my case, I'm creating ImageViews programmatically.
I'm trying to display all images from a particular folder located in the storage. The bitmaps retrieved will be placed in ImageViews which are contained within a GridView.
Here's my code:
//pass an array containing all images paths to adapter
imageGrid.setAdapter(new GridViewAdapter(getActivity(), FilePathStrings));
part of GridVewAdapter code:
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if(convertView == null){
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setPadding(5, 5, 5, 5);
imageView.setAdjustViewBounds(true);
}else{
imageView = (ImageView) convertView;
}
imageView.setTag(filepath[position]);
new LoadImages(imageView).execute();
return imageView;
}
AsyncTask to retrieve bitmaps:
private class LoadImages extends AsyncTask<Object, Void, Bitmap> {
private ImageView imgView;
private String path;
private LoadImages(ImageView imgView) {
this.imgView = imgView;
this.path = imgView.getTag().toString();
}
#Override
protected Bitmap doInBackground(Object... params) {
Bitmap bitmap = null;
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = 6;
bitmap = BitmapFactory.decodeFile(path, bmOptions);
try {
int dimension = getSquareCropDimensionForBitmap(bitmap);
bitmap = ThumbnailUtils.extractThumbnail(bitmap, dimension, dimension);
}catch (Exception e) {
e.printStackTrace();
}
return bitmap;
}
#Override
protected void onPostExecute(Bitmap result) {
if (!imgView.getTag().toString().equals(path)) {
return;
}
if(result != null && imgView != null){
imgView.setVisibility(View.VISIBLE);
imgView.setImageBitmap(result);
}else{
imgView.setVisibility(View.GONE);
}
}
}
Method to get equal dimensions so bitmaps will be displayed as squares:
private int getSquareCropDimensionForBitmap(Bitmap bitmap) {
int dimension;
//If the bitmap is wider than it is height then use the height as the square crop dimension
if (bitmap.getWidth() >= bitmap.getHeight()) {
dimension = bitmap.getHeight();
}
//If the bitmap is taller than it is width use the width as the square crop dimension
else {
dimension = bitmap.getWidth();
}
return dimension;
}
GridView in the layout file:
<GridView
android:id="#+id/imageGridView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:columnWidth="30dp"
android:numColumns="5"
android:verticalSpacing="5dp"
android:horizontalSpacing="5dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_marginTop="30dp">
</GridView>
The result that I've gotten:
The circled thin "lines" are actually the ImageViews displayed.
Any help is very much appreciated. Thank you in advance!

<GridView
android:id="#+id/imageGridView"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="5dp"
android:horizontalSpacing="5dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_marginTop="30dp">

I have other views above the GridView so I can't set its height to fill_parent/match_parent in the .xml file as it will affect the views above.
The solution to my problem is to set GridView's height and width programmatically.
Replace:
imageView.setLayoutParams(new GridView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
With this:
imageView.setLayoutParams(new GridView.LayoutParams(int height, int width));
Explanation:
Grid View doc
Anyone who has a better answer, please post it :)

ListView Image spacing issue when trying to load image from url

I was trying to load image from internet using an imageloader.And this imageloader is used to reduce the size and scale the image and it successfully doing it, But my listview rows shows more space on top of row and bottom. In other words List row height is increased, I want to reduce the height of the list row, and just occur the images in row someone please help me to fix this
code
public class ImageLoader {
MemoryCache memoryCache=new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews=Collections.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
LinearLayout l;
public ImageLoader(Context context){
fileCache=new FileCache(context);
executorService=Executors.newFixedThreadPool(5);
}
final int stub_id=R.drawable.ic_launcher;
public void DisplayImage(String url, ImageView imageView)
{
imageViews.put(imageView, url);
Bitmap bitmap=memoryCache.get(url);
if(bitmap!=null)
imageView.setImageBitmap(bitmap);
else
{
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView)
{
PhotoToLoad p=new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url)
{
File f=fileCache.getFile(url);
//from SD cache
Bitmap b = decodeFile(f);
if(b!=null)
return b;
//from web
try {
Bitmap bitmap=null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is=conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex){
ex.printStackTrace();
if(ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
//decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE=70;
int width_tmp=o.outWidth, height_tmp=o.outHeight;
int scale=1;
while(true){
if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
break;
width_tmp/=2;
height_tmp/=2;
scale*=2;
}
//decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
//Task for the queue
private class PhotoToLoad
{
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i){
url=u;
imageView=i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad){
this.photoToLoad=photoToLoad;
}
#Override
public void run() {
if(imageViewReused(photoToLoad))
return;
Bitmap bmp=getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if(imageViewReused(photoToLoad))
return;
BitmapDisplayer bd=new BitmapDisplayer(bmp, photoToLoad);
Activity a=(Activity)photoToLoad.imageView.getContext();
a.runOnUiThread(bd);
}
}
boolean imageViewReused(PhotoToLoad photoToLoad){
String tag=imageViews.get(photoToLoad.imageView);
if(tag==null || !tag.equals(photoToLoad.url))
return true;
return false;
}
//Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable
{
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p){bitmap=b;photoToLoad=p;}
public void run()
{
if(imageViewReused(photoToLoad))
return;
if(bitmap!=null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="10" >
<ImageView
android:id="#+id/image"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="5"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/image2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="5"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</LinearLayout>

use layout like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="10" >
<ImageView
android:id="#+id/image"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="5"
android:src="#drawable/ic_launcher"
android:scaleType="fitXY"
/>
<ImageView
android:id="#+id/image2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="5"
android:src="#drawable/ic_launcher"
android:scaleType="fitXY"
/>
</LinearLayout>
</LinearLayout>

try this,
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:weightSum="10" >
<ImageView
android:id="#+id/image"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="5"
android:scaleType="fitXY"
android:src="#drawable/ic_launcher" />
<ImageView
android:id="#+id/image2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="5"
android:scaleType="fitXY"
android:src="#drawable/ic_launcher" />
</LinearLayout>
</LinearLayout>

How to reduce vertical space in gridview in android

I am able to manage the horizontal space between images in a grid view. But how to reduce vertical space between images in a grid view.
Following is my code:
<LinearLayout android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:layout_margin="5dp">
<GridView
android:id="#+id/gridView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="0dp"
android:verticalSpacing="5dp"
android:horizontalSpacing="5dp"
android:scrollingCache="true"
android:smoothScrollbar="true"
android:clipChildren="true"
android:alwaysDrawnWithCache="true"
android:numColumns="auto_fit"
android:columnWidth="70dp">
</GridView>
</LinearLayout>
getView method
//---returns an ImageView view---
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView imageView = null;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
imageView.setTag(position);
} else {
imageView = (ImageView) convertView;
}
if((Integer)imageView.getTag() == 0) {
Bitmap bitmap = Bitmap.createScaledBitmap(imgPic.get(position).getBitmap(), 250, 200, false);
imageView.setImageBitmap(bitmap);
}else {
FileInputStream fs = null;
//Bitmap bm;
try {
fs = new FileInputStream(new File(imgPic.get(position).getFilePath().toString()));
if(fs!=null) {
//to get the thumbnail view of the image
Bitmap scaledBitmap = decodeFile(imgPic.get(position).getFilePath().toString(), 250, 200);
imageView.setImageBitmap(scaledBitmap);
imageView.setId(position);
}
} catch (IOException e) {
e.printStackTrace();
} finally{
if(fs!=null) {
try {
fs.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
return imageView;
}
decodeFile is a function to resize the image

You use the attribute android:horizontalSpacing="5dp", decreased its value.