Develop Reference

GridView is not updated with notifyDataSetChanged()

I have an Activity with GridView, with images in it. The images are parsed from the SD card of the device. Once the Activity starts, images are downloaded to the SD card using AsyncTask.
The problem is that this GridView does not get updated when images are downloaded. I want this GridView to be updated if more images are added to the directory (i.e. if more images are downloaded). I have tried notifyDataSetChanged() and invalidateViews(), however they are not helping.
Here is my code for the MainActivity, Image adapter and AsyncTask. Please try to show me where I made the mistake.
MainActivity:
ImageAdapter ia = new ImageAdapter(this);
GridView gridView;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.grid_layout);
gridView = (GridView) findViewById(R.id.grid_view);
// Instance of ImageAdapter Class
ImageAdapter iAdapter = new ImageAdapter(this);
gridView.setAdapter(iAdapter);
iAdapter.notifyDataSetChanged();
gridView.invalidateViews();
new ImageDownlader(AndroidGridLayoutActivity.this, this).execute(downloadUrl);
gridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
getView() of Image Adapter:
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageBitmap(getImageByIndex(imageThumbnails, position));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(155, 155));
return imageView;
}
ImageDownlader:
class ImageDownlader extends AsyncTask<String, Void, Void> {
private Context context;
public ImageDownlader(Context c){
context = c;
}
Sync s = new Sync();
#Override
protected Void doInBackground(String... param) {
// this is where images are downloaded to SD card
saveToSD ();
return null;
}
#Override
protected void onPreExecute() {
Log.i("Async-Example", "onPreExecute Called");
}
protected void onPostExecute()
{
Log.i("Async-Example", "onPostExecute Called");
}

The first, you should download Image from URL and return it.
import java.io.InputStream;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;
public class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
The second, create an Adapter
import java.util.List;
import vn.mve.obj.Video;
import vn.mve.util.DownloadImageTask;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import vn.mve.e4u.Detail;
import vn.mve.e4u.R;
public class VideoAdapter extends BaseAdapter {
private List<Video> list;
private Context context;
private LayoutInflater inflater;
public VideoAdapter(Context context, List<Video> list) {
this.context = context;
this.list = list;
inflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int position) {
return list.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = inflater.inflate(R.layout.layout_video_gridview, parent, false);
ImageView iv_thumb = (ImageView) view.findViewById(R.id.iv_thumb);
new DownloadImageTask(iv_thumb).execute(list.get(position).getThumbnail());
TextView tv_title = (TextView) view.findViewById(R.id.tv_title);
tv_title.setText(list.get(position).getTitle());
LinearLayout item = (LinearLayout) view.findViewById(R.id.item);
item.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context, Detail.class);
intent.putExtra("ID", list.get(position).getId());
context.startActivity(intent);
}
});
return view;
}
}
Right here:
new DownloadImageTask(iv_thumb).execute(list.get(position).getThumbnail());
You can Create an Instance of DownloadImageTask, after that you can get an Image like that:
imageTask = new DownloadImageTask(iv_thumb).execute(list.get(position).getThumbnail());
Bitmap myImage = imageTask.get(); // Please put in try-catch
The last, in MainActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
List<Video> list = null;
MVideo mVideo = new MVideo(getApplicationContext());
list = mVideo.getList(VideoType.GET_ALL);
VideoAdapter adapter = new VideoAdapter(this, list);
if (list != null) {
GridView gvVideo = (GridView) findViewById(R.id.gv_video);
gvVideo.setAdapter(adapter);
}
}
Hope this will help you!

How can i make a button as Set Wallpaper button?

The code contains a gallery with one button (which has to be added into your manifest file), I just need a suggestion on the button action; what to put inside "imageIDs* or bitmap to reference to the image which previously is clicked and shown.
Here is the complete code:
package net.keivan.gallery;
import java.io.IOException;
import android.app.Activity;
import android.app.ProgressDialog;
import android.app.WallpaperManager;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
public class GalleryActivity extends Activity {
//---the images to display---
Integer[] imageIDs = {
R.drawable.pic1,
R.drawable.pic2,
R.drawable.pic3,
R.drawable.pic4,
R.drawable.pic5,
R.drawable.pic6,
R.drawable.pic8,
R.drawable.pic9,
R.drawable.pic10,
};
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Gallery gallery = (Gallery) findViewById(R.id.gallery1);
gallery.setAdapter(new ImageAdapter(this));
gallery.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View v,
int position, long id)
{
//---Displays the name of images as just as i click on them---
Toast.makeText(getBaseContext(),
"pic" + (position + 1) + " selected",
Toast.LENGTH_SHORT).show();
//---display the images selected---
ImageView imageView = (ImageView) findViewById(R.id.image1);
imageView.setImageResource(imageIDs[position]);
}
});
}
//---Set Wallpaper button---
public void onClick(View v) {
try {
/*at this part can you suggest what to put inside "imageIDs* or *bitmap* to reference
to the image which previously is clicked and shown*/
/* first.the activity is created second.the image which i clicked is shown third.whin
the user click on the button the image which previously is clicked on is set as background.*/
WallpaperManager.getInstance(this).setResource(imageIDs[position]);
//WallpaperManager.getInstance(this).setBitmap(mBitmap);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
///////////////////////////////////////////////
public class ImageAdapter extends BaseAdapter
{
Context context;
int itemBackground;
public ImageAdapter(Context c)
{
context = c;
//---setting the style---
TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
itemBackground = a.getResourceId(
R.styleable.Gallery1_android_galleryItemBackground, 0);
a.recycle();
}
{ getApplicationContext().getWallpaper(); }
//---returns the number of images---
public int getCount() {
return imageIDs.length;
}
//---returns the item---
public Object getItem(int position) {
return position;
}
//---returns the ID of an item---
public long getItemId(int position) {
return position;
}
//---returns an ImageView view---
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
imageView.setImageResource(imageIDs[position]);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
} else {
imageView = (ImageView) convertView;
}
imageView.setBackgroundResource(itemBackground);
return imageView;
}
}
}

try {
// Set background from a resource
WallpaperManager.getInstance(this).setResource(imageIDs[position]);
// or set background from a bitmap
//WallpaperManager.getInstance(this).setBitmap(mBitmap);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
In your manifest file:
<uses-permission android:name="android.permission.SET_WALLPAPER"></uses-permission>

How to handle null pointer exception in android

I am trying to make photo gallery application.But I am having following error and my program will crashed.Also I am having error to this line :
imageView.setImageResource(pics[arg2]);
error
09-03 16:45:22.618: E/AndroidRuntime(443): Uncaught handler: thread main exiting due to uncaught exception
09-03 16:45:22.628: E/AndroidRuntime(443): java.lang.NullPointerException
09-03 16:45:22.628: E/AndroidRuntime(443): at com.example.myfirstapplication.setwall$1.onItemClick(setwall.java:40)
09-03 16:45:22.648: E/dalvikvm(443): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
Here is my code:
package com.sai.samples.views;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class GalleryView extends Activity {
Integer[] pics = {
R.drawable.antartica1,
R.drawable.antartica2,
R.drawable.antartica3,
R.drawable.antartica4,
R.drawable.antartica5,
R.drawable.antartica6,
R.drawable.antartica7,
R.drawable.antartica8,
R.drawable.antartica9,
R.drawable.antartica10
};
ImageView imageView;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Gallery ga = (Gallery)findViewById(R.id.Gallery01);
ga.setAdapter(new ImageAdapter(this));
imageView = (ImageView)findViewById(R.id.ImageView01);
ga.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Toast.makeText(getBaseContext(),
"You have selected picture " + (arg2+1) + " of Antartica",
Toast.LENGTH_SHORT).show();
imageView.setImageResource(pics[arg2]);
}
});
}
public class ImageAdapter extends BaseAdapter {
private Context ctx;
int imageBackground;
public ImageAdapter(Context c) {
ctx = c;
TypedArray ta = obtainStyledAttributes(R.styleable.Gallery1);
imageBackground = ta.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 1);
ta.recycle();
}
#Override
public int getCount() {
return pics.length;
}
#Override
public Object getItem(int arg0) {
return arg0;
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
ImageView iv = new ImageView(ctx);
iv.setImageResource(pics[arg0]);
iv.setScaleType(ImageView.ScaleType.FIT_XY);
iv.setLayoutParams(new Gallery.LayoutParams(150,120));
iv.setBackgroundResource(imageBackground);
return iv;
}
}
}
here is my main.xml
<?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">
<Gallery
android:id="#+id/Gallery01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"></Gallery>
<ImageView
android:id="#+id/ImageView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></ImageView>
</LinearLayout>

This line probably returns null :
imageView = (ImageView)findViewById(R.id.ImageView01);
Check if the ImageView id is correct, and try to clean and rebuild your project if the error persists.

I have used this code for creating a gallery of images,
public class GalleryViewActivity extends Activity
{
GridView gridView;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gridView = (GridView)findViewById(R.id.gridView);
gridView.setAdapter(new ImageAdapter(this));
}
}
class ImageAdapter extends BaseAdapter
{
ArrayList<String> images;
private Context mContext;
public ImageAdapter(Context c)
{
mContext = c;
}
public int getCount()
{
return mThumbIds.length;
}
public Object getItem(int position)
{
return null;
}
public long getItemId(int position)
{
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(final 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(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
}
else
{
imageView = (ImageView) convertView;
}
imageView.setClickable(true);
imageView.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
Intent i = new Intent(v.getContext(), showImageClass.class);
Toast.makeText(v.getContext(), mThumbIds.toString() + " Clicked", 5000).show();
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("imageName", mThumbIds[position]);
v.getContext().startActivity(i);
}
});
// imageView.setImageDrawable(images);
// imageView.setImageBitmap(images);
// imageView.setImageResource(images[]);
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// references to images
private Integer[] mThumbIds =
{
R.drawable.abc,
R.drawable.def,
R.drawable.klm,
R.drawable.pqr,
R.drawable.rst,
R.drawable.wxy,
R.drawable.xyz,
};
}

First create a class GalleryViewActivity
public class GalleryViewActivity extends Activity
{
GridView gridView;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gridView = (GridView)findViewById(R.id.gridView);
gridView.setAdapter(new ImageAdapter(this));
}
}
class ImageAdapter extends BaseAdapter
{
ArrayList<String> images;
private Context mContext;
public ImageAdapter(Context c)
{
mContext = c;
}
public int getCount()
{
return mThumbIds.length;
}
public Object getItem(int position)
{
return null;
}
public long getItemId(int position)
{
return 0;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(final 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(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
}
else
{
imageView = (ImageView) convertView;
}
imageView.setClickable(true);
imageView.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
Intent i = new Intent(v.getContext(), showImageClass.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("position", "" + position);
v.getContext().startActivity(i);
}
});
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
// references to images
private Integer[] mThumbIds =
{
R.drawable.abc,
R.drawable.def,
R.drawable.klm,
R.drawable.pqr,
R.drawable.rst,
R.drawable.wxy,
R.drawable.xyz,
};
}
Dont forget to add images in the drawable folder. the image should be same as you mentioned in the mThumbIds array, like i have used abc.jpg, def.jpg and so on..
Then you need to create a showImage.java class, here you take a imageview to show the large view of image clicked..
public class showImageClass extends Activity
{
private Integer[] mThumbIds =
{
R.drawable.abc,
R.drawable.def,
R.drawable.klm,
R.drawable.pqr,
R.drawable.rst,
R.drawable.wxy,
R.drawable.xyz,
};
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.showimage);
int position = Integer.parseInt(this.getIntent().getStringExtra("position"));
ImageView jpgView = (ImageView)findViewById(R.id.imageView);
jpgView.setImageResource(mThumbIds[position]);
}
}
This code has worked for me, it will definitely work..
Dont forget to add the relavent images and import the class libraries that are needed.
Mention both the activities in android manifest file

how to view next image in imageview?

Hi I have images in grid view. when i click my grid view images, it's display in full screen. if i want view another image go back in grid view then select another image view in full screen. i feel it's hard one.. so i am trying to view images full screen view using to swipe....no idea how to create this method please guide me and give some nice codes also...
This is my working app screen shot:
source code: 1. ImageViewExample.java
public class ImageViewExample extends Activity {
/** Called when the activity is first created. */
private Cursor imagecursor, actualimagecursor;
private int image_column_index, actual_image_column_index;
GridView imagegrid;
private int count;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init_phone_image_grid();
}
private void init_phone_image_grid() {
String[] img = { MediaStore.Images.Thumbnails._ID };
imagecursor = managedQuery(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, img, null,
null, MediaStore.Images.Thumbnails.IMAGE_ID + "");
image_column_index = imagecursor
.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
count = imagecursor.getCount();
imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imagegrid.setAdapter(new ImageAdapter(getApplicationContext()));
imagegrid.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView parent, View v,int position, long id) {
System.gc();
String[] proj = { MediaStore.Images.Media.DATA };
actualimagecursor = managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj,
null, null, null);
actual_image_column_index = actualimagecursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
actualimagecursor.moveToPosition(position);
String i = actualimagecursor.getString(actual_image_column_index);
System.gc();
Intent intent = new Intent(getApplicationContext(), ViewImage.class);
intent.putExtra("filename", i);
startActivity(intent);
}
});
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position,View convertView,ViewGroup parent) {
System.gc();
ImageView i = new ImageView(mContext.getApplicationContext());
if (convertView == null) {
imagecursor.moveToPosition(position);
int id = imagecursor.getInt(image_column_index);
i.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, ""+ id));
i.setScaleType(ImageView.ScaleType.CENTER_CROP);
i.setLayoutParams(new GridView.LayoutParams(92, 92));
}
else {
i = (ImageView) convertView;
}
return i;
}
}
}
ViewImage.java
public class ViewImage extends Activity {
private String filename;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.gc();
Intent i = getIntent();
Bundle extras = i.getExtras();
BitmapFactory.Options bfo = new BitmapFactory.Options();
bfo.inSampleSize = 2;
filename = extras.getString("filename");
ImageView iv = new ImageView(getApplicationContext());
Bitmap bm = BitmapFactory.decodeFile(filename, bfo);
iv.setImageBitmap(bm);
setContentView(iv);
}
}

After getting id of selected image, implement this..
// this Class For Grid view images
package com.thumbnailview;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
public class Activity_ThumbView extends Activity
{
GridView gridview;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new ImageAdapter(this));
gridview.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
Toast.makeText(Activity_ThumbView.this, "" + position, 2).show();
id=parent.getPositionForView(v);
Intent i=new Intent(Activity_ThumbView.this,Activity_ImageView.class);
i.putExtra("position", position);
startActivity(i);
finish();
}
});
}
public class ImageAdapter extends BaseAdapter
{
Context context;
public ImageAdapter(Context c )
{
context = c ;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return mThumbIds[position];
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null)
{
imageView = new ImageView(context);
imageView.setLayoutParams(new GridView.LayoutParams(75, 75));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
}
else
{
imageView = (ImageView) convertView;
}
imageView.setImageResource(mThumbIds[position]);
return imageView;
}
}
public static Integer[] mThumbIds = {
R.drawable.a,R.drawable.icon,
R.drawable.b, R.drawable.s,
R.drawable.c, R.drawable.r,
R.drawable.d, R.drawable.q,
R.drawable.e, R.drawable.p,
R.drawable.f, R.drawable.o,
R.drawable.g, R.drawable.n,
R.drawable.h, R.drawable.m,
R.drawable.i, R.drawable.l,
R.drawable.j, R.drawable.k,
R.drawable.t,R.drawable.y,
R.drawable.u,R.drawable.x,
R.drawable.v,R.drawable.s,
R.drawable.cd,R.drawable.z,
R.drawable.bc,R.drawable.ab
};
}
// This Flip image Class
package com.thumbnailview;
import java.io.IOException;
import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ViewFlipper;
public class Activity_ImageView extends Activity
{
ImageView thumb_imgview;
ViewFlipper viewFlipper;
Button b_wall;
Button b_home;
// Animation a,b;
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
int j;
WallpaperManager myWall;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.image);
j=getIntent().getExtras().getInt("position");
myWall = WallpaperManager.getInstance(getApplicationContext());
b_wall=(Button) findViewById(R.id.button3);
b_home=(Button) findViewById(R.id.button1);
thumb_imgview=(ImageView) findViewById(R.id.thumb_txt_image);
thumb_imgview.setImageResource(Activity_ThumbView.mThumbIds[j]);
gestureDetector = new GestureDetector(new MyGestureDetector());
b_wall.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
myWall.setResource(Activity_ThumbView.mThumbIds[j]);
} catch (IOException e) {
e.printStackTrace();
}
}
});
b_home.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent i=new Intent(Activity_ImageView.this,Activity_ThumbView.class);
startActivity(i);
finish();
}
});
}
public class MyGestureDetector extends SimpleOnGestureListener implements OnGestureListener
{
public boolean onFling(MotionEvent m1, MotionEvent m2, float velocityX, float velocityY)
{
try
{
if (Math.abs(m1.getY() - m2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if(m1.getX() - m2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
if(Activity_ThumbView.mThumbIds.length>j)
{
j++;
thumb_imgview.setImageResource(Activity_ThumbView.mThumbIds[j]);
}
}
else if (m2.getX() - m1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
if(j>0)
{
j--;
thumb_imgview.setImageResource(Activity_ThumbView.mThumbIds[j]);
}
}
}
catch (Exception e)
{
}
return false;
}
}
public boolean onTouchEvent(MotionEvent event)
{
if (gestureDetector.onTouchEvent(event))
return true;
else
return false;
}
}

Implement OnGestureListener in ViewImage activity and capture swipe from user.
For displaying previous or next image, use cursor.

Store all image filenames in array when you are populating into Gridview and then pass that array to another view from that array you can get all images instead of go back to gridview for selecting images..

The easiest way to do this is indeed like RajaReddy P said: create an array with the filenames/urls pass it to the ViewImage activity...
For the ViewImage activity I really would use the ViewPager! Really easy to implement and the swiping is handled for you!
More about viewpager:
http://android-developers.blogspot.com/2011/08/horizontal-view-swiping-with-viewpager.html

Displaying full screen image by clicking on grid item in Gridview

I want to display full screen image by clicking on the grid view item.I am done with grid view but no idea how to do this. Please give me some idea to do this??
Thanks....!
mGridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position,long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Image"+(position+1), Toast.LENGTH_SHORT).show();
Intent intent =new Intent(getApplicationContext(),MyImageViewActivity.class);
intent.putExtra("filename", i);
startActivity(intent);
}
});
MyGridView.java
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyStore.LoadStoreParameter;
import com.myworkspace.R.menu;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.provider.ContactsContract.CommonDataKinds.Im;
import android.provider.MediaStore.Audio.Media;
import android.provider.SyncStateContract.Columns;
import android.sax.StartElementListener;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class MyGridView extends Activity {
GridView mGridView;
int counter,i;
MyImageAdapter adapter = null;
ImageView imgVw;
Bitmap bitmap;
private Cursor cursor;
int columnIndex;
Integer[] mThumbsIds = {
R.drawable.image1,R.drawable.image2,
R.drawable.image3,R.drawable.image4,
R.drawable.image5,R.drawable.icon,
R.drawable.icon,R.drawable.icon,
R.drawable.icon
};
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.mygridacti);
ImageView imageview = (ImageView)findViewById(R.id.GalleryView);
mGridView = (GridView)findViewById(R.id.grdvw);
adapter = new MyImageAdapter(this);
adapter.notifyDataSetChanged();
mGridView.setAdapter(adapter);
mGridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position,long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Image"+(position+1), Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(MyGridView.this, MyImageViewActivity.class);
Bundle bundle = new Bundle();
bundle.putInt("image", mThumbsIds[position]);
myIntent.putExtras(bundle);
startActivityForResult(myIntent, 0);
}
});
}
}
class MyImageAdapter extends BaseAdapter{
private Context mContext;
ImageView imageview;
int counter;
public MyImageAdapter(Context c){
mContext = c;
}
public MyImageAdapter(OnClickListener onClickListener) {
// TODO Auto-generated constructor stub
}
#Override
public int getCount() {
return mThumbsIds.length;
}
#Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
#Override
public View getView(final int position, final View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
if(convertView == null){
imageview = new ImageView(mContext);
imageview.setLayoutParams(new GridView.LayoutParams(85,85));
imageview.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageview.setPadding(8, 8, 8, 8);
counter++;
}
else{
imageview = (ImageView) convertView;
}
imageview.setImageResource(mThumbsIds[position]);
return imageview;
}
private Integer[] mThumbsIds = {
R.drawable.image1,R.drawable.image2,
R.drawable.image3,R.drawable.image4,
R.drawable.image5,R.drawable.icon,
R.drawable.icon,R.drawable.icon,
R.drawable.icon};
}

You know how to show images in gridView. after this perform action of
grid.setOnItemClickListener(new OnItemClickListener(){
Intent intent = new Intent
(getApplicationContext(), ViewImage.class);
intent.putExtra("filename", fileName);
//here fileName is something which tells the next activity about "selected image"
//It can be ImageLocation/ImageName/ImageID/ImageURL
startActivity(intent);
}
ViewImage.class
//here I assume that you send the ImageFile in the extra.
//so, converted it into bitmap and showed in the ImageView
Bundle extras = getIntent().getExtras();
BitmapFactory.Options bfo = new BitmapFactory.Options();
bfo.inSampleSize = 2;
filename = extras.getString("filename");
mBitmap = BitmapFactory.decodeFile(filename, bfo);
imageview.setbitmap(mbitmap);

You should do something like this in your setOnItemClickListener, I m using your code and improving it
mGridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position,long id) {
// use gridItem position to get the Image from mThumbsIds
int image = mThumsIds[position] // here I m passing the position of GridViewItem
Intent intent =new Intent(getApplicationContext(),MyImageViewActivity.class);
intent.putExtra("image", image);
startActivity(intent);
}
});
You do not need to pass Bundle if you are just sending a single Image ID
now in your ViewImage.class you can get the image from the intent using
I m using Glide to show you how to display this Image in ImageView
int image = getIntent().getIntExtra("image");
//now you can use this "image" variable to display image
ImageView imageView = findViewById(R.id.imageView);
Glide.with(this).load(image).into(imageView); // here pass you imageView in the last method as parameter
Hope this will help!

On itemClick, just pass the position
mGridView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View v, int position,long id) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Image"+(position+1), Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(MyGridView.this, MyImageViewActivity.class);
myIntent.putInt("image", position);
startActivityForResult(myIntent, 0);
}
});
In other Activity,
public class MyImageViewActivity extends AppCompatActivity {
Integer[] mThumbsIds = {
R.drawable.image1,R.drawable.image2,
R.drawable.image3,R.drawable.image4,
R.drawable.image5,R.drawable.icon,
R.drawable.icon,R.drawable.icon,
R.drawable.icon
};
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_question7_spinner_background);
Intent intent = getIntent();
int position = intent.getIntExtra("image", 0);
int imageId = mThumbsIds[position];
}
}