AsyncTask to update adapter UI

AsyncTask to update adapter UI - android

im pretty new to Android and AsyncTask and was hoping you could help...Im trying to refresh an ImageView adapter so it updates on the UI... i was told to use notifyDataSetChanged() but i just can get it to work...i have setup an asynctask but the only result i get is a NullPointerException...i need the update to happen when a new element is added to my nextColorArray....Please look at my code, i seriously dont even know if im using my asynctask in the right manner or if im even close?!..cheers
public class GameScreen extends Activity{
int yellow = 0xffffff66;
int green = 0xff00EE76;
int red = 0xffff4342;
int blue = 0xff42c3ff;
int purple = 0xff9932CC;
int white = 0xFFFFFFFF;
int total_Count = 0;
int colorPosition = 0;//nextColor position
int colorPickerStart = 0;
ArrayList<Integer>nextColorArray;
ImageView imageView;
ImageAdapter ia;
private static final String TAG = GameScreen.class.getSimpleName();//log
ArrayList<Integer>colorPicker = new ArrayList<Integer>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.game_screen);
new upDateNextColor().execute();
}
class upDateNextColor extends AsyncTask<Void, Void, Void> {
GridView gridview2;
#Override
protected Void doInBackground(Void... voids) {
return null;
}
#Override
protected void onPostExecute(Void result) {
nextColorArray.add(blue);
nextColorArray.add(green);
nextColorArray.add(red);
nextColorArray.add(yellow);
nextColorArray.add(purple);
Collections.shuffle(nextColorArray);
}
#Override
protected void onPreExecute() {
nextColorArray = new ArrayList<Integer>(10);
gridview2 = (GridView) findViewById(R.id.colorNext);
ia = new ImageAdapter(nextColorArray);
gridview2.setAdapter(ia);
if(total_count > 10){
nextColorArray.add(0, white);
ia.notifyDataSetChanged();
}
}
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList aL;
public ImageAdapter(Context c, ArrayList<Integer>aL) {
mContext = c;
this.aL = aL;
}
public ImageAdapter(ArrayList<Integer>aL) {
this.aL = aL;
}
public ImageAdapter(Context c){
mContext = c;
}
public int getCount() {
return 10;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
imageView = new ImageView(mContext);
imageView.setLayoutParams(new GridView.LayoutParams(50, 50));
imageView.setBackgroundColor(nextColorArray.get(colorPosition));
if(colorPosition < 9) colorPosition++;
} else {
imageView = (ImageView) convertView;
}
return imageView;
}
}
Logcat
E/AndroidRuntime: FATAL EXCEPTION: main java.lang.NullPointerException
at android.view.ViewConfiguration.get(ViewConfiguration.java:332)
at android.view.View.<init>(View.java:3254)
at android.widget.ImageView.<init>(ImageView.java:105)

you are getting Null Pointer Exception because :
1. mContext is null in ImageAdapter becuase you are using Single parameter Constructor of ImageAdapter for creating object. so pass Activity Context also as:
ia = new ImageAdapter(GameScreen.this,nextColorArray);
2. use
gridview2 = (GridView)GameScreen.this. findViewById(R.id.colorNext);
for initializing GridView in onPreExecute
Edit: I made these changes in the code.
return aL.size(); // change this in getCount()
imageView.setBackgroundColor(nextColorArray.get(position));
FullCode
public class MainActivity extends Activity{
int yellow = 0xffffff66;
int green = 0xff00EE76;
int red = 0xffff4342;
int blue = 0xff42c3ff;
int purple = 0xff9932CC;
int white = 0xFFFFFFFF;
int total_Count = 0;
int colorPosition = 0;//nextColor position
int colorPickerStart = 0;
ArrayList<Integer>nextColorArray;
ImageView imageView;
ImageAdapter ia;
private static final String TAG = MainActivity.class.getSimpleName();//log
ArrayList<Integer>colorPicker = new ArrayList<Integer>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new upDateNextColor().execute();
}
class upDateNextColor extends AsyncTask<Void, Void, Void> {
GridView gridview2;
#Override
protected Void doInBackground(Void... voids) {
return null;
}
#Override
protected void onPostExecute(Void result) {
nextColorArray.add(blue);
nextColorArray.add(green);
nextColorArray.add(red);
nextColorArray.add(yellow);
nextColorArray.add(purple);
Collections.shuffle(nextColorArray);
}
#Override
protected void onPreExecute() {
nextColorArray = new ArrayList<Integer>(10);
gridview2 = (GridView) findViewById(R.id.gridview);
ia = new ImageAdapter(nextColorArray);
gridview2.setAdapter(ia);
nextColorArray.add(0, white);
ia.notifyDataSetChanged();
}
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList aL;
public ImageAdapter(Context c, ArrayList<Integer>aL) {
mContext = c;
this.aL = aL;
}
public ImageAdapter(ArrayList<Integer>aL) {
this.aL = aL;
}
public ImageAdapter(Context c){
mContext = c;
}
public int getCount() {
//int a = 10;
return aL.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
imageView = new ImageView(MainActivity.this);
imageView.setLayoutParams(new GridView.LayoutParams(50, 50));
imageView.setBackgroundColor(nextColorArray.get(position));
if(colorPosition < 9) colorPosition++;
} else {
imageView = (ImageView) convertView;
}
return imageView;
}
}
}
Snap shot

Related

Android GridView getItem Color

I have a custom GridView populated by array of colors.
Now when I click the item I want to get the color of cell.
I have this code, but when I click the item, get the java.lang.NullPointerException.
public class Colori_picker extends Activity {
private GridView grColori;
private ColorPickerAdapter mAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.color_picker);
grColori= (GridView) findViewById(R.id.gridViewColors);
grColori.setAdapter(new ColorPickerAdapter(this));
grColori.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Object color = mAdapter.getItem(position);
finish();
}
});
}
the adapter
public class ColorPickerAdapter extends BaseAdapter {
private Context context;
// list which holds the colors to be displayed
private List<Integer> colorList = new ArrayList<Integer>();
// width of grid column
int colorGridColumnWidth;
public ColorPickerAdapter(Context context) {
this.context = context;
String colors[][] = {
{ "83334C", "B65775", "E07798", "F7A7C0", "FBC8D9", "FCDEE8" },
{ "000000", "434343", "666666", "999999", "CCCCCC", "EFEFEF" } };
colorList = new ArrayList<Integer>();
// add the color array to the list
for (int i = 0; i < colors.length; i++) {
for (int j = 0; j < colors[i].length; j++) {
colorList.add(Color.parseColor("#" + colors[i][j]));
}
}
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) {
imageView = new ImageView(context);
// set the width of each color square
imageView.setLayoutParams(new GridView.LayoutParams(colorGridColumnWidth, colorGridColumnWidth));
} else {
imageView = (ImageView) convertView;
}
imageView.setBackgroundColor(colorList.get(position));
imageView.setId(position);
return imageView;
}
public int getCount() {
return colorList.size();
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
}

What is happening is that you are declaring the instance variable mAdapter but never instantiating it. All you need to do is change this
grColori.setAdapter(new ColorPickerAdapter(this));
To this
mAdapter = new ColorPickerAdapter(this);
grColori.setAdapter(mAdapter);

Android. Memory leak causing out of memory error. Using View Pager.

I am getting a memory leak from the following code. It is an activity that contains a mainViewPager. That viewPager return 4 different fragments, which each have their own ViewPagers that hold images which are being retrieved from the same asyncTask. Here is my code. When I run it I can scroll throught the Pages with some lag. But when I exit the go back into the activity I get an Out Of Memory Error. So it must be a memory leak. I've stared at my code forever and I can't figure out why. Please help me... PS. I am using the Picasso library to fetch the images from a server.
Activity
package info.nightowl.nightowl;
import info.nightowl.nightowl.LocationsGridFragment.onLocationSelectedListener;
public class NightWatch extends FragmentActivity implements onLocationSelectedListener {
public static ArrayList<String> imageUrl = new ArrayList<String>();
public static ArrayList<String> dateList = new ArrayList<String>();
public static ArrayList<String> trendList = new ArrayList<String>();
public static ArrayList<String> nameList = new ArrayList<String>();
public static ArrayList<String> imageLocationsList = new ArrayList<String>();
public static ArrayList<String> imageClubsList = new ArrayList<String>();
public static ArrayList<String> locationsList = new ArrayList<String>();
public static ArrayList<String> clubsList = new ArrayList<String>();
public static ArrayList<String> locationImagesUrl = new ArrayList<String>();
public static ArrayList<String> addressList = new ArrayList<String>();
public static ArrayList<String> hotImageUrl = new ArrayList<String>();
public static ArrayList<String> hotDateList = new ArrayList<String>();
public static ArrayList<String> hotTrendList = new ArrayList<String>();
public static ArrayList<String> hotNameList = new ArrayList<String>();
public static ArrayList<String> hotImageLocationsList = new ArrayList<String>();
public static ArrayList<String> hotImageClubsList = new ArrayList<String>();
FetchClubs fetchClubs = null;
public int width, height;
public JSONArray list;
public final String IMAGE_URL = "http://www.night-owl.info/webservice/";
SharedPreferences prefs;
static FeedFragment feedFragment;
static LocationsFragment locationsFragment;
static HotFragment hotFragment;
static ClubsFragment clubsFragment;
CustomViewPager customPager;
CustomViewPageAdapter theAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_night_watch);
//Method to set up the tabs
getSizes();
setupFragments();
updateList();
prefs = getSharedPreferences("prefs", 0);
}
//Called from the fragment which fetches image
public void loadBitmap(String image, ImageView imageView, boolean grid, TextView loadText) {
int size;
if (grid) size = (width-width/9)/3;
else size = width - width/9;
Log.d("Pager About to load", "Pager Loading bitmap picasso");
getBitmap load = new getBitmap(image, imageView, size, loadText);
load.execute(image);
}
public class getBitmap extends AsyncTask<String, Void, Bitmap> {
String loadImageUrl;
Bitmap bmp;
int sizes;
TextView loadingTextView;
private final WeakReference<ImageView> imageViewReference;
public getBitmap(String image, ImageView imageView, int size, TextView loadText){
imageViewReference = new WeakReference<ImageView>(imageView);
sizes = size;
loadingTextView = loadText;
}
#Override
protected void onPreExecute() {
Log.d("async", "async starting");
super.onPreExecute();
}
#Override
protected Bitmap doInBackground(String... arg0) {
// TODO Auto-generated method stub
try {
bmp = Picasso.with(NightWatch.this).load(IMAGE_URL+arg0[0]).resize(sizes,
sizes).get();
} catch (IOException e) {
Log.d("ioexc", "Pager IOEXCEPTION IDIOT!!!");
e.printStackTrace();
}
return bmp;
}
#Override
protected void onPostExecute(Bitmap bitmap) {
/*RoundedCornersDrawable drawable = new RoundedCornersDrawable(getResources(), bmp);
loadImage.setImageDrawable(drawable);
loadingTextView.setVisibility(View.GONE);
loadImage.setVisibility(View.VISIBLE);*/
if(imageViewReference != null && bitmap!= null) {
final ImageView imageView = imageViewReference.get();
if(imageView != null) {
imageView.setImageBitmap(bitmap);
loadingTextView.setVisibility(View.GONE);
imageView.setVisibility(View.VISIBLE);
}
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.feed, menu);
return true;
}
//SET UP THE TWO TABS 'FEED' AND 'LOCATIONS'
//Update ArrayList of the image names
public void updateList() {
imageUrl.clear();
trendList.clear();
dateList.clear();
nameList.clear();
imageLocationsList.clear();
imageClubsList.clear();
locationsList.clear();
clubsList.clear();
locationImagesUrl.clear();
addressList.clear();
hotImageUrl.clear();
hotTrendList.clear();
hotDateList.clear();
hotNameList.clear();
hotImageLocationsList.clear();
hotImageClubsList.clear();
new getImageUrl().execute();
new getLocationsUrl().execute();
}
class getImageUrl extends AsyncTask<String, String, String> {
#Override
protected String doInBackground(String... arg0) {
JSONParser parser = new JSONParser();
JSONObject json = parser.getJSONFromUrl(IMAGE_URL + "updateimages.php");
try {
list = json.getJSONArray("posts");
for(int i = 0; i < list.length(); i++) {
JSONObject c = list.getJSONObject(i);
String imgSrc = c.getString("source");
String trend = c.getString("trend");
String date = c.getString("date");
String name = c.getString("name");
String location = c.getString("location");
String club = c.getString("club");
imageUrl.add(imgSrc);
dateList.add(date);
trendList.add(trend);
nameList.add(name);
imageLocationsList.add(location);
imageClubsList.add(club);
Log.d("async trend", trendList.get(0));
}
Log.d("Got list", imageUrl.get(0) + " " + trendList.get(0));
} catch(JSONException je) {
je.printStackTrace();
}
try {
list = json.getJSONArray("hot");
for(int i = 0; i < list.length(); i++) {
JSONObject c = list.getJSONObject(i);
String imgSrc = c.getString("source");
String trend = c.getString("trend");
String date = c.getString("date");
String name = c.getString("name");
String location = c.getString("location");
String club = c.getString("club");
hotImageUrl.add(imgSrc);
hotDateList.add(date);
hotTrendList.add(trend);
hotNameList.add(name);
hotImageLocationsList.add(location);
hotImageClubsList.add(club);
Log.d("async trend", trendList.get(0));
}
Log.d("Got list","hot list" + hotImageUrl.get(0) + " " + hotTrendList.get(0));
} catch(JSONException je) {
je.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
hotFragment.updateAdapter();
feedFragment.updateAdapter();
}
}
public void scrollMainPager(int pos) {
customPager.setCurrentItem(pos, true);
}
public void scrollPager(int pos) {
feedFragment.scrollPager(pos);
}
public void setupFragments() {
feedFragment = new FeedFragment();
locationsFragment = new LocationsFragment();
hotFragment = new HotFragment();
clubsFragment = new ClubsFragment();
customPager = (CustomViewPager) findViewById(R.id.customviewpager);
customPager.setOffscreenPageLimit(3);
theAdapter = new CustomViewPageAdapter(getSupportFragmentManager());
customPager.setAdapter(theAdapter);
customPager.setCurrentItem(1);
}
//GET SIZES OF SCREEN
public void getSizes(){
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
width = size.x;
height = size.y;
}
public static class CustomViewPageAdapter extends FragmentStatePagerAdapter {
public CustomViewPageAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
if(arg0 == 0) return hotFragment;
else if(arg0 == 1) return feedFragment;
else if(arg0 == 2) return locationsFragment;
else if(arg0 == 3) return clubsFragment;
return null;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return 4;
}
}
#Override
public void onLocationSelected(int position) {
}
}
FeedFragment
public class FeedFragment extends Fragment implements OnClickListener {
ToggleButton buttonGrid;
static Spinner spinnerUploadStatus;
CustomEditText et;
CustomScrollTextView tv;
int width, height;
View view;
static boolean isGrid;
ViewPager mPager;
SharedPreferences prefs;
public ImagePagerAdapter mPageAdapter;
Button buttonSwitchFragment;
Integer[] b = { R.drawable.statusunpressed, R.drawable.red,
R.drawable.green, R.drawable.blue };
List<Integer> spinnerList = new ArrayList<Integer>(Arrays.asList(b));
CustomSpinnerAdapter myAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
prefs = getActivity().getSharedPreferences("prefs", 0);
getSizes();
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_feed, container, false);
setup();
return view;
}
#SuppressLint("NewApi")
public void setup() {
isGrid = false;
mPager = (ViewPager) view.findViewById(R.id.myviewpager1);
mPager.setOffscreenPageLimit(0);
buttonGrid = (ToggleButton) view.findViewById(R.id.button_grid);
buttonGrid.setOnClickListener(this);
spinnerUploadStatus = (Spinner) view
.findViewById(R.id.buttonUploadStatus);
myAdapter = new CustomSpinnerAdapter(getActivity(),
R.layout.item_simple_list_item, spinnerList);
myAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerUploadStatus.setAdapter(myAdapter);
spinnerUploadStatus.setDropDownWidth((int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50, getResources()
.getDisplayMetrics()));
spinnerUploadStatus.setOnItemSelectedListener(myOnItemSelectedListener);
spinnerUploadStatus.getBackground().setAlpha(0);
buttonSwitchFragment = (Button) view
.findViewById(R.id.buttonSwitchFragment);
buttonSwitchFragment.setOnClickListener(this);
Typeface font = Typeface.createFromAsset(getActivity().getAssets(),
"NotCourierSans.ttf");
et = (CustomEditText) view.findViewById(R.id.customEditText1);
et.updateTypeFace(font);
tv = (CustomScrollTextView) view
.findViewById(R.id.customscrolltextview);
tv.setText("WELCOME TO NIGHTOWL");
tv.setTypeface(font);
tv.start(width / 2500.0);
Log.d("width", "width is " + width);
}
public void getSizes() {
Display display = getActivity().getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
width = size.x;
height = size.y;
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_grid:
isGrid = !isGrid;
updateAdapter();
break;
case R.id.buttonSwitchFragment:
((NightWatch) getActivity()).scrollMainPager(2);
break;
}
}
public OnItemSelectedListener myOnItemSelectedListener = new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
int colour = arg2;
spinnerUploadStatus.setSelection(0, true);
et.sendText(prefs.getString("username", "username invalid"), colour);
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
public void scrollPager(int position) {
isGrid = false;
buttonGrid.setChecked(false);
updateAdapter();
mPager.setCurrentItem(position, true);
Log.d("Pager", "PAGER UPDATED");
}
public static void disableButton(Boolean enabled) {
spinnerUploadStatus.setEnabled(enabled);
}
public void updateAdapter() {
int theSize;
if (!isGrid)
theSize = NightWatch.imageUrl.size();
else if (NightWatch.imageUrl.size() % 9 > 0)
theSize = NightWatch.imageUrl.size() / 9 + 1;
else
theSize = NightWatch.imageUrl.size() / 9;
mPageAdapter = new ImagePagerAdapter(getChildFragmentManager(), theSize);
mPager.setAdapter(mPageAdapter);
Log.d("size of viewPager Adapter", "" + theSize);
}
public static class ImagePagerAdapter extends FragmentStatePagerAdapter {
int mSize;
public ImagePagerAdapter(FragmentManager fm, int size) {
super(fm);
mSize = size;
}
#Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
Log.d("Starting imageDetailFragment", "");
Log.d("Pager", "Pager starting fragment");
Log.d("GRID", "fuck grid");
if (!isGrid)
return ImageDetailFragment.newInstance(
arg0, NightWatch.imageUrl, NightWatch.nameList,
NightWatch.trendList, NightWatch.dateList);
else
return GridFragment.newInstance(arg0, NightWatch.imageUrl);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return mSize;
}
}
public class CustomSpinnerAdapter extends ArrayAdapter<Integer> {
List<Integer> resourceId;
Context c;
public CustomSpinnerAdapter(Context context, int textViewResourceId,
List<Integer> objects) {
super(context, textViewResourceId, objects);
resourceId = objects;
c = context;
}
#Override
public View getDropDownView(int position, View convertView,
ViewGroup parent) {
return getCustomDropdownView(position, convertView, parent);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
return getCustomView(position, convertView, parent);
}
public View getCustomView(int position, View convertView,
ViewGroup parent) {
ImageView imageView = new ImageView(c);
imageView.setImageResource(resourceId.get(position));
imageView.setLayoutParams(new ListView.LayoutParams(
(int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50, getResources()
.getDisplayMetrics()), (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 34,
getResources().getDisplayMetrics())));
return imageView;
}
public View getCustomDropdownView(int position, View convertView,
ViewGroup parent) {
ImageView imageView = new ImageView(c);
imageView.setImageResource(resourceId.get(position));
imageView.setLayoutParams(new ListView.LayoutParams(
(int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50, getResources()
.getDisplayMetrics()), (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 34,
getResources().getDisplayMetrics())));
if (position == 0) {
imageView.setVisibility(View.GONE);
}
return imageView;
}
}
}
ImageDetailFragment
package info.nightowl.nightowl;
import java.io.IOException;
import java.util.ArrayList;
import com.example.nightowl.R;
import com.squareup.picasso.Picasso;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.Point;
import android.graphics.Typeface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class ImageDetailFragment extends Fragment implements OnClickListener {
int mImageNum;
ImageView imageView;
TextView trendTextView;
TextView nameTextView;
TextView dateTextView;
TextView loadingTextView;
Button upVoteButton, downVoteButton;
final String list = "voteList";
static SharedPreferences prefs;
SharedPreferences.Editor editor;
public ArrayList<String> imageUrl;
public ArrayList<String> trendList;
public ArrayList<String> nameList;
public ArrayList<String> dateList;
RelativeLayout.LayoutParams rParams;
int width, height;
static ImageDetailFragment newInstance(int imageNum,
ArrayList<String> imageList, ArrayList<String> tempNameList,
ArrayList<String> tempTrendList, ArrayList<String> tempDateList) {
final ImageDetailFragment f = new ImageDetailFragment();
Bundle args = new Bundle();
args.putInt("imageNum", imageNum);
args.putStringArrayList("imageList", imageList);
args.putStringArrayList("nameList", tempNameList);
args.putStringArrayList("trendList", tempTrendList);
args.putStringArrayList("dateList", tempDateList);
f.setArguments(args);
return f;
}
public ImageDetailFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mImageNum = getArguments().getInt("imageNum");
imageUrl = getArguments().getStringArrayList("imageList");
nameList = getArguments().getStringArrayList("nameList");
trendList = getArguments().getStringArrayList("trendList");
dateList = getArguments().getStringArrayList("dateList");
} else
mImageNum = -1;
prefs = getActivity().getSharedPreferences("prefs", 0);
editor = getActivity().getSharedPreferences("prefs", 0).edit();
getSizes();
rParams = new RelativeLayout.LayoutParams((width - width/9), width - width/9);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.image_detail_fragment,
container, false);
imageView = (ImageView) v.findViewById(R.id.imageView1);
imageView.setVisibility(View.INVISIBLE);
loadingTextView = (TextView) v.findViewById(R.id.loadingTextView);
loadingTextView.setVisibility(View.VISIBLE);
trendTextView = (TextView) v.findViewById(R.id.trendTextView);
nameTextView = (TextView) v.findViewById(R.id.nameTextView);
dateTextView = (TextView) v.findViewById(R.id.dateTextView);
upVoteButton = (Button) v.findViewById(R.id.buttonUpVote);
downVoteButton = (Button) v.findViewById(R.id.buttonDownVote);
rParams.addRule(RelativeLayout.BELOW, nameTextView.getId());
rParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
imageView.setLayoutParams(rParams);
upVoteButton.setOnClickListener(this);
downVoteButton.setOnClickListener(this);
if (NightWatch.class.isInstance(getActivity())) {
Typeface font = Typeface.createFromAsset(getActivity().getAssets(),
"NotCourierSans.ttf");
final String image = imageUrl.get(mImageNum);
((NightWatch) getActivity()).loadBitmap(image, imageView, false, loadingTextView);
trendTextView.setText(trendList.get(mImageNum));
nameTextView.setText(nameList.get(mImageNum));
dateTextView.setText(dateList.get(mImageNum));
updateButtonBackgrounds();
loadingTextView.setTypeface(font);
trendTextView.setTypeface(font);
nameTextView.setTypeface(font);
dateTextView.setTypeface(font);
Log.d("fragment trend", NightWatch.trendList.get(0));
}
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonUpVote:
if (prefs.getInt(imageUrl.get(mImageNum), 0) == -1) {
downVoteButton
.setBackgroundResource(R.drawable.downvoteunpressed);
upVoteButton.setBackgroundResource(R.drawable.upvotepressed);
((NightWatch) getActivity()).sendVote(1,
imageUrl.get(mImageNum));
} else if (prefs.getInt(imageUrl.get(mImageNum), 0) == 0) {
upVoteButton.setBackgroundResource(R.drawable.upvotepressed);
((NightWatch) getActivity()).sendVote(1,
imageUrl.get(mImageNum));
}
break;
case R.id.buttonDownVote:
if (prefs.getInt(imageUrl.get(mImageNum), 0) == 1) {
downVoteButton
.setBackgroundResource(R.drawable.downvotepressed);
upVoteButton.setBackgroundResource(R.drawable.upvoteunpressed);
((NightWatch) getActivity()).sendVote(-1,
imageUrl.get(mImageNum));
} else if (prefs.getInt(imageUrl.get(mImageNum), 0) == 0) {
downVoteButton
.setBackgroundResource(R.drawable.downvotepressed);
((NightWatch) getActivity()).sendVote(-1,
imageUrl.get(mImageNum));
}
break;
}
};
public void updateButtonBackgrounds() {
if (prefs.getInt(imageUrl.get(mImageNum), 0) == -1) {
downVoteButton.setBackgroundResource(R.drawable.downvotepressed);
} else if (prefs.getInt(imageUrl.get(mImageNum), 0) == 1) {
upVoteButton.setBackgroundResource(R.drawable.upvotepressed);
}
}
public static void sendVote(int vote, String imageName) {
prefs.edit().putInt(imageName, vote).commit();
}
public void getSizes() {
Display display = getActivity().getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
width = size.x;
height = size.y;
}
}
HotFragment
package info.nightowl.nightowl;
public class HotFragment extends Fragment implements OnClickListener {
ToggleButton buttonGrid;
static Spinner spinnerUploadStatus;
CustomEditText et;
CustomScrollTextView tv;
int width, height;
View view;
static boolean isGrid;
ViewPager mPager;
SharedPreferences prefs;
public ImagePagerAdapter mPageAdapter;
Button buttonSwitchFragment;
Integer[] b = { R.drawable.statusunpressed, R.drawable.red,
R.drawable.green, R.drawable.blue };
List<Integer> spinnerList = new ArrayList<Integer>(Arrays.asList(b));
CustomSpinnerAdapter myAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
prefs = getActivity().getSharedPreferences("prefs", 0);
getSizes();
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.activity_feed, container, false);
setup();
return view;
}
#SuppressLint("NewApi")
public void setup() {
isGrid = false;
mPager = (ViewPager) view.findViewById(R.id.myviewpager1);
mPager.setOffscreenPageLimit(0);
buttonGrid = (ToggleButton) view.findViewById(R.id.button_grid);
buttonGrid.setOnClickListener(this);
spinnerUploadStatus = (Spinner) view
.findViewById(R.id.buttonUploadStatus);
myAdapter = new CustomSpinnerAdapter(getActivity(),
R.layout.item_simple_list_item, spinnerList);
myAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerUploadStatus.setAdapter(myAdapter);
spinnerUploadStatus.setDropDownWidth((int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50, getResources()
.getDisplayMetrics()));
spinnerUploadStatus.setOnItemSelectedListener(myOnItemSelectedListener);
spinnerUploadStatus.getBackground().setAlpha(0);
buttonSwitchFragment = (Button) view
.findViewById(R.id.buttonSwitchFragment);
buttonSwitchFragment.setOnClickListener(this);
Typeface font = Typeface.createFromAsset(getActivity().getAssets(),
"NotCourierSans.ttf");
et = (CustomEditText) view.findViewById(R.id.customEditText1);
et.updateTypeFace(font);
tv = (CustomScrollTextView) view
.findViewById(R.id.customscrolltextview);
tv.setText("WELCOME TO NIGHTOWL");
tv.setTypeface(font);
tv.start(width / 2500.0);
Log.d("width", "width is " + width);
}
public void getSizes() {
Display display = getActivity().getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
width = size.x;
height = size.y;
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_grid:
isGrid = !isGrid;
updateAdapter();
break;
case R.id.buttonSwitchFragment:
((NightWatch) getActivity()).scrollMainPager(1);
break;
}
}
public OnItemSelectedListener myOnItemSelectedListener = new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
spinnerUploadStatus.setSelection(0, true);
et.sendText(prefs.getString("username", "username invalid"), arg2);
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
public void scrollPager(int position) {
isGrid = false;
buttonGrid.setChecked(false);
updateAdapter();
mPager.setCurrentItem(position, true);
Log.d("Pager", "PAGER UPDATED");
}
public static void disableButton(Boolean enabled) {
spinnerUploadStatus.setEnabled(enabled);
}
public void updateAdapter() {
int theSize;
if (!isGrid)
theSize = NightWatch.imageUrl.size();
else if (NightWatch.imageUrl.size() % 9 > 0)
theSize = NightWatch.imageUrl.size() / 9 + 1;
else
theSize = NightWatch.imageUrl.size() / 9;
mPageAdapter = new ImagePagerAdapter(getChildFragmentManager(), theSize);
mPager.setAdapter(mPageAdapter);
Log.d("size of viewPager Adapter", "" + theSize);
}
public static class ImagePagerAdapter extends FragmentStatePagerAdapter {
int mSize;
public ImagePagerAdapter(FragmentManager fm, int size) {
super(fm);
mSize = size;
}
#Override
public Fragment getItem(int arg0) {
// TODO Auto-generated method stub
Log.d("Starting imageDetailFragment", "");
Log.d("Pager", "Pager starting fragment");
Log.d("GRID", "fuck grid");
if (!isGrid)
return ImageDetailFragment.newInstance(arg0,
NightWatch.hotImageUrl, NightWatch.hotNameList,
NightWatch.hotTrendList, NightWatch.hotDateList);
else
return GridFragment.newInstance(arg0, NightWatch.imageUrl);
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return mSize;
}
}
public class CustomSpinnerAdapter extends ArrayAdapter<Integer> {
List<Integer> resourceId;
Context c;
public CustomSpinnerAdapter(Context context, int textViewResourceId,
List<Integer> objects) {
super(context, textViewResourceId, objects);
resourceId = objects;
c = context;
}
#Override
public View getDropDownView(int position, View convertView,
ViewGroup parent) {
return getCustomDropdownView(position, convertView, parent);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
return getCustomView(position, convertView, parent);
}
public View getCustomView(int position, View convertView,
ViewGroup parent) {
ImageView imageView = new ImageView(c);
imageView.setImageResource(resourceId.get(position));
imageView.setLayoutParams(new ListView.LayoutParams(
(int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50, getResources()
.getDisplayMetrics()), (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 34,
getResources().getDisplayMetrics())));
return imageView;
}
public View getCustomDropdownView(int position, View convertView,
ViewGroup parent) {
ImageView imageView = new ImageView(c);
imageView.setImageResource(resourceId.get(position));
imageView.setLayoutParams(new ListView.LayoutParams(
(int) TypedValue.applyDimension(
TypedValue.COMPLEX_UNIT_DIP, 50, getResources()
.getDisplayMetrics()), (int) TypedValue
.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 34,
getResources().getDisplayMetrics())));
if (position == 0) {
imageView.setVisibility(View.GONE);
}
return imageView;
}
}
}
I dont see a point in posting the rest of the fragments. The memory leak is somewhere here I'm sure
I would really appreciate it if someone helped me with this.

Loading a Bitmap from a URL in such manner will cause IOException. With Picasso, you don't even need asynctask. Simply call this in UI Thread:
Picasso.with(getActivity())
.load(url)
.into(imageView); //you can add .resize() before .into()
OR if you really want to have the Bitmap, you use this code:
new AsyncTask<Void, Void, Void>() {
Bitmap bitmap;
#Override
protected void onPreExecute() {
//some code
}
#Override
protected Void doInBackground(Void... arg0) {
bitmap = getBitmapFromURL(url);
return null;
}
#Override
protected void onPostExecute(Void result) {
imageView.setImageBitmap(bitmap);
}
}.execute();
And getBitmapFromURL():
public Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
return BitmapFactory.decodeStream(input);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}

Ok so I would recommend you stick with using Picasso as this will make your life a lot easier in terms of memory management and the likes. One thing to remember is that the image contained in an imageview can ultimately retrieved as a Bitmap regardless of the image type (eg jpeg, png etc), so if you use Picasso to load the image via a URL you can still retrieve the image as a Bitmap after it is loaded and apply your transformation on it. Picasso also have a function called .transform() which you can use to transform your images by supplying a custom transformation. Here is an example for a rounded transformation, first the code that implements the transformation:
//calcualte the raduis for the rounded images
final float scale = mContext.getResources().getDisplayMetrics().density; //get screen density for scale
int pixels = (int) ((imageView.getWidth()-5) * scale); //get screen pixels based on density. Imageview is 60dp x 60dp in size, subtract some padding = 55
mRadiusCenter = pixels / 2; //get the raduis
//now load your image
Picasso.with(mContext)
.load(imageUrl)
.fit().centerCrop()
.transform(new RoundedTransformation(mRadiusCenter))
.into(imageView);
The you need to create a class for the RoundedTransformation that implements Picasso Transformation:
// enables hardware accelerated rounded corners
// original idea here : http://www.curious-creature.org/2012/12/11/android-recipe-1-image-with-rounded-corners/
public class RoundedTransformation implements com.squareup.picasso.Transformation {
private final int radius;
// radius is corner radii in dp
public RoundedTransformation(final int radius) {
this.radius = radius;
}
#Override
public Bitmap transform(final Bitmap source) {
final Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));
Bitmap output = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(output);
canvas.drawCircle(radius, radius, radius, paint);
if (source != output) {
source.recycle();
}
return output;
}
#Override
public String key() {
return "rounded";
}
}
Here are some more links that might prove useful:
https://gist.github.com/julianshen/5829333
Load large images with Picasso and custom Transform object
Hope that helps!

Implementing lazy loading for simplecursoradapter

Here I am getting stored picture paths from the database. So that I am showing the images in the gridview with the help of paths. But as it is shown in my code below, I am loading cursoradapter in the asynctask. The problem here is for the first time it is okay that it takes some time until all images are loaded.
But if user adds one more pic to the database, it again takes much time to load all images as I kept the asynctask in onResume() to make the added picture also visible. The same is the case whenever user adds each picture. Can someone suggest me a simple way to get the last added picture visible in the gridview without having to load all the pictures again. Or in the least case can some one help me implementing lazy adapter to the present cursoradapter if that is not possible?
public class ImagesScreen extends Activity {
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.images_screen);
gridView = (GridView)findViewById(R.id.gridView1);
String[] from = new String[] { Reminders.MOM_PATHS };
int[] to = new int[] {};
dbCon = new SQLiteConnectClass(ImagesScreen.this);
imageCursorAdapter = new ImageCursorAdapter(ImagesScreen.this, R.layout.griditem, null, from, to);
gridView.setAdapter(imageCursorAdapter);
}
protected void onResume() {
super.onResume();
new GetImages().execute((Object[]) null);
}
private class GetImages extends AsyncTask<Object, Object, Cursor> {
#Override
protected Cursor doInBackground(Object... params) {
return dbCon.getAllImages();
}
#Override
protected void onPostExecute(Cursor result) {
imageAdapter.changeCursor(result);
}
public void addpictures(View view){
// code for adding picture paths to the database by transferring to another activity.
}
}
CustomAdapter class:
public class ImageCursorAdapter extends SimpleCursorAdapter{
private int layout;
private LayoutInflater mLayoutInflater;
private Context mContext;
public ImageAdapter(Context context, int layout, Cursor c,String[] from, int[] to) {
super(context, layout, c, from, to,0);
this.layout = layout;
mLayoutInflater=LayoutInflater.from(context);
mContext = context;
}
public View newView(Context context, Cursor cursor, ViewGroup parent) {
View v = mLayoutInflater.inflate(layout, parent, false);
return v;
}
public void bindView(final View v, final Context context, Cursor c) {
final int id = c.getInt(c.getColumnIndex("id"));
final String imagepath = c.getString(c.getColumnIndex("paths"));
ImageView imageview = (ImageView)v.findViewById(R.id.imageView1);
File imgFile = new File(imagepath);
if(imgFile.exists()){
Bitmap imageBitmap = decodeFile(imgFile);
imageview.setImageBitmap(imageBitmap);
}
}
}

use this code
public class Imagegallery extends Activity implements OnItemClickListener,
OnScrollListener, OnTouchListener {
Button btn;
SQLiteDatabase sampleDB = null;
String SAMPLE_DB_NAME = "hic";
int size = 0;
TextView headertext;
Button cartbtn;
ImageView footer1, footer2, footer3, footer4, footer5;
GridView gridView;
boolean larg = false;
String products;
int j = 1;
int ii = 0;
String imagepath[];
String productname[];
int productid[] = new int[1000];
String productids[] = new String[1000];
int integerprodids[] = new int[1000];
final Context context = this;
String filename2[];
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.currentspecial);
File root = new File(Environment.getExternalStorageDirectory()
+ File.separator + "aiwhic/product" + File.separator);
File[] fileName = root.listFiles();
filename2 = new String[fileName.length];
for (int j = 0; j < fileName.length; j++) {
Uri uri = Uri.fromFile(fileName[j]);
filename2[j] = fileName[j].getAbsolutePath();
Log.e("file", filename2[j]);
}
gridView = (GridView) findViewById(R.id.gridView1);
gridView.setAdapter(new ImageAdapter(this, filename2, filename2));
gridView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
int isf = filename2[position].lastIndexOf("/");
int laf = filename2[position].lastIndexOf(".");
String filename = filename2[position].substring(isf + 1, laf);
int pos = Integer.parseInt(filename);
Intent go = new Intent(Imagegallery.this, ItemsPage.class);
Bundle bundle = new Bundle();
bundle.putInt("position", pos);
bundle.putString("whichclass", "imagegallery");
bundle.putInt("catid", 2);
go.putExtras(bundle);
startActivity(go);
}
});
}
public class ImageAdapter extends BaseAdapter {
private Context context;
private final String[] mobileValues;
private final String[] mobileimages;
public ImageAdapter(Context context, String[] mobileValues, String[] mo) {
this.context = context;
this.mobileValues = mobileValues;
this.mobileimages = mo;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View gridView;
if (convertView == null) {
gridView = new View(context);
gridView = inflater.inflate(R.layout.currentspeciallist, null);
TextView textView = (TextView) gridView
.findViewById(R.id.textView1);
textView.setText(mobileValues[position]);
textView.setVisibility(View.INVISIBLE);
ImageView imageView = (ImageView) gridView
.findViewById(R.id.imageView1);
imageView.setTag(mobileimages[position]);
new Loadimage().execute(imageView);
// imageView.setImageBitmap(BitmapFactory
// .decodeFile(mobileimages[position]));
} else {
gridView = (View) convertView;
}
return gridView;
}
public int getCount() {
return mobileimages.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
}
class Loadimage extends AsyncTask<Object, Void, Bitmap> {
private ImageView imv;
private String path;
#Override
protected Bitmap doInBackground(Object... params) {
imv = (ImageView) params[0];
path = imv.getTag().toString();
// Bitmap thumb = BitmapFactory.decodeFile(path);
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inSampleSize = 2; // for 1/2 the image to be loaded
Bitmap thumb = Bitmap.createScaledBitmap(
BitmapFactory.decodeFile(path, opts), 120, 120, false);
return thumb;
}
#Override
protected void onPostExecute(Bitmap bitmap) {
if (!imv.getTag().toString().equals(path)) {
/*
* The path is not same. This means that this image view is
* handled by some other async task. We don't do anything and
* return.
*/
return;
}
if (bitmap != null && imv != null) {
imv.setVisibility(View.VISIBLE);
imv.setImageBitmap(bitmap);
} else {
imv.setVisibility(View.GONE);
}
}
}
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
}
then create a xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/RelativeLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="#drawable/ic_launcher" >
</ImageView>
</RelativeLayout>
i am getting file path directly . u just get the name from sqlite and pass the array string

use Android-Universal-Image-Loader
and set
ImageView imageview = (ImageView)v.findViewById(R.id.imageView1);
File imgFile = new File(imagepath);
if(imgFile.exists()){
imageLoader.displayImage(imageUri(ur file path), imageView);
}

Adding Bitmaps dynamically to gridview in android

I am trying to add bitmap images in gridview but continuously getting exceptions. when i try to do this in layouts it works fine. I am unable to get it. Here is the code what i am doing is:
public class SampleActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GridView gv=(GridView)this.findViewById(R.id.gv);
Bitmap src = BitmapFactory.decodeResource(getResources(), R.drawable.logo);
for (int i=0;i<3;i++)
{
for (int j=0;j<3;j++)
{
ImageView iv= new ImageView(this);
// iv.setId(i);
Bitmap bm=Bitmap.createBitmap(src,j*(src.getWidth()/2),j*(src.getHeight()/3),src.getWidth()/3,src.getHeight()/3);
iv.setImageBitmap(bm);
gv.addView(iv);
}
}
}
Kindly Any help is welcome :))

for adding data in Gridview, you have to set adapter
gridview.setAdapter(adapter);
see example http://developer.android.com/guide/tutorials/views/hello-gridview.html

Here is an idea. You can create a ImageAdapter and add a SetImages function. Then you add your ImageAdapter to the GridView, prepare the images and set the through the ImageAdapter.
For sample:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.grid);
GridView gridview=(GridView)this.findViewById(R.id.gridView);
Integer[] mThumbIds = {
R.drawable.logo, R.drawable.logo, R.drawable.logo,
R.drawable.logo, R.drawable.logo, R.drawable.logo,
R.drawable.logo, R.drawable.logo, R.drawable.logo,
R.drawable.logo, R.drawable.logo, R.drawable.logo
};
ImageAdapter myAdapter = new ImageAdapter(this);
myAdapter.SetImages(mThumbIds);
gridview.setAdapter(myAdapter);
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private Integer[] pics;
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return pics.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(int position, View convertView, ViewGroup parent) {
ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
imageView = new ImageView(mContext);
//You can set some params here
} else {
imageView = (ImageView) convertView;
}
imageView.setImageResource(pics[position]);
return imageView;
}
public void SetImages(Integer[] id){
pics = id.clone();
}
}
I don't know if this is the right approach but it works :D

public class ImageAdapter extends BaseAdapter
{
private Context context;
private List<String> path_images = new ArrayList<String>();
public ImageAdapter( Context context, List<String> path_images ){ this.context = context; this.path_images = path_images; }
#Override public int getCount ( ){ return images.size(); }
#Override public Object getItem (int i){ return BitmapFactory.decodeFile( path_images.get(i) ); }
#Override public long getItemId(int i){ return 0; }
#Override public View getView(int i, View convertView, ViewGroup parent)
{
ImageView imageView = new ImageView( context );
imageView.setImageBitmap( BitmapFactory.decodeFile( paht_images.get(i) ) );
imageView.setScaleType( ImageView.ScaleType.CENTER_CROP );
imageView.setLayoutParams(new GridView.LayoutParams( 145, 145 ));
return imageView;
}
}
private void present_all_images()
{
final String FS = File.separator;
final String directory = Environment.getExternalStorageDirectory().toString() + FS + "directory";
List<String> path_images = new ArrayList<String>();
path_images.add( directory + FS + "image01.png" );
path_images.add( directory + FS + "image02.png" );
path_images.add( directory + FS + "image03.png" );
grid_data = (GridView)findViewById(R.id.gallery_grid_data);
grid_data.setAdapter( new ImageAdapter( this, path_images ) );
grid_data.setOnItemClickListener(new OnItemClickListener(){ public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
}});
}

NullPointerException in Gallery

I am trying make a gallery which contains all images in the assets folder, but I keep getting a NullPointerException error,can anyone tell me what's wrong?
public class MyGallery extends Activity {
private GridView gv;
private SlidingDrawer sd;
private ImageView im;
private int[] icons={R.drawable.download,R.drawable.setwallpaper,
R.drawable.list,R.drawable.other};
private String[] items={"下载到本地","设置为桌面","列表查看","支持本APP"};
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
gv = (GridView)findViewById(R.id.grid);
sd = (SlidingDrawer)findViewById(R.id.drawer);
im=(ImageView)findViewById(R.id.openicon);
/* 使用告定义的MyGridViewAdapter设置GridView里面的item内容 */
MyGridViewAdapter adapter=new MyGridViewAdapter(this,items,icons);
gv.setAdapter(adapter);
/* 设定SlidingDrawer被打开的事件处理 */
sd.setOnDrawerOpenListener(new SlidingDrawer.OnDrawerOpenListener()
{
#Override
public void onDrawerOpened()
{
im.setImageResource(R.drawable.closedrawer);
}
});
/* 设置SlidingDrawer被关闭的事件处理 */
sd.setOnDrawerCloseListener(new SlidingDrawer.OnDrawerCloseListener()
{
#Override
public void onDrawerClosed()
{
im.setImageResource(R.drawable.showdrawer);
}
});
Log.d("tag", "抽屉初始化成功");
Gallery g = (Gallery) findViewById(R.id.mygallery);
/*新增几ImageAdapter并设定给Gallery对象*/
g.setAdapter(new ImageAdapter(this,getImage()));
/*设定一个itemclickListener事件*/
g.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent,
View v, int position, long id)
{
}
});
Log.d("tag", "图片初始化成功");
}
private List<String> getImage()
{
/* 设定目前所在路径 */
List<String> it=new ArrayList<String>();
File f=new File("file:///android_asset/");
File[] files=f.listFiles();
Log.d("tag", "读取asset资源");
/* 将所有文件存入ArrayList中 */
for(int i=0;i<files.length;i++)
{
File file=files[i];
if(getImageFile(file.getPath()))
it.add(file.getPath());
}
return it;
}
private boolean getImageFile(String fName)
{
boolean re;
/* 取得扩展名 */
String end=fName.substring(fName.lastIndexOf(".")+1,
fName.length()).toLowerCase();
/* 按扩展名的类型决定MimeType */
if(end.equals("jpg")||end.equals("gif")||end.equals("png")
||end.equals("jpeg")||end.equals("bmp"))
{
re=true;
}
else
{
re=false;
}
return re;
}
/*改写BaseAdapter自定义一ImageAdapter class*/
public class ImageAdapter extends BaseAdapter
{
/*声明变量*/
int mGalleryItemBackground;
private Context mContext;
private List<String> lis;
/*ImageAdapter的构造符*/
public ImageAdapter(Context c,List<String> li)
{
mContext = c;
lis=li;
/* 使用res/values/attrs.xml中的<declare-styleable>定义
* 的Gallery属性.*/
TypedArray a = obtainStyledAttributes(R.styleable.Gallery);
/*取得Gallery属性的Index id*/
mGalleryItemBackground = a.getResourceId(
R.styleable.Gallery_android_galleryItemBackground, 0);
/*让对象的styleable属性能够反复使用*/
a.recycle();
}
/*几定要重写的方法getCount,传回图片数目*/
public int getCount()
{
return lis.size();
}
/*一定要重写的方法getItem,传回position*/
public Object getItem(int position)
{
return position;
}
/*一定要重写的方法getItemId,传并position*/
public long getItemId(int position)
{
return position;
}
/*几定要重写的方法getView,传并几View对象*/
public View getView(int position, View convertView,
ViewGroup parent)
{
/*产生ImageView对象*/
ImageView i = new ImageView(mContext);
/*设定图片给imageView对象*/
Bitmap bm = BitmapFactory.decodeFile(lis.
get(position).toString());
i.setImageBitmap(bm);
/*重新设定图片的宽高*/
i.setScaleType(ImageView.ScaleType.FIT_XY);
/*重新设定Layout的宽高*/
i.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
/*设定Gallery背景图*/
i.setBackgroundResource(mGalleryItemBackground);
/*传回imageView对象*/
return i;
}
}
}
I am really grateful.

Are you trying to load images from assets folder in your project ??? Well, in that case try reading asset files through AssetManager. I think this might help

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