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pagination in recyclerview in android

I'm trying to implement pagination in recyclerview.
Following are my java classes:
MyAdapter.java
package com.example.opinion;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/**
* Created by manish on 7/18/2016.
*/
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private ArrayList<String> movieName = new ArrayList();
public MyAdapter(ArrayList film)
{
this.movieName = film;
}
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_items, null);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.movieText.setText(movieName.get(position));
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount()
{
System.out.print(movieName.size());
return movieName.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView movieText;
public ViewHolder(View v) {
super(v);
movieText = (TextView) v.findViewById(R.id.movieName);
}
}
}
viewfragment.java : here i'm fetching the data on my local network. In this file the loadMore(current_page) function only fetches 3 values at time. The first time when it is called, those three values are only visible in the cardview inside recyclerview. I don't know where the problem is!
package com.example.opinion;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Text;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.content.Intent;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.GET;
import retrofit2.http.Path;
public class ViewFragment extends Fragment {
private static final String PREFS_NAME = "Prefname";
public int j =0;
static String quesText;
//public static final String BASE_URL = "http://192.168.0.104/";
public interface PostquesApi{
#GET("ques/{i}")
Call<quesGetResponse> quesget(#Path("i") String i);
}
static class quesGetResponse {
String ques1;
String ques2;
String ques3;
String quid1;
String quid2;
String quid3;
public quesGetResponse(String ques1, String ques2, String ques3, String u1, String u2,String u3){
this.ques1 = ques1;
this.ques2 = ques2;
this.ques3 = ques3;
this.quid1 = u1;
this.quid2 = u2;
this.quid3 = u3;
}
}
//View rootView;
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private ArrayList movieList = new ArrayList();
private static int current_page = 1;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.fragment_view, container, false);
for(int k=0; k<2; k++) {
loadData(current_page);
}
System.out.println("contents of movie list: "+ movieList);
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// use a linear layout manager
LinearLayoutManager feedLayoutManager = new LinearLayoutManager(getActivity());
mAdapter = new MyAdapter(movieList);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setLayoutManager(feedLayoutManager);
// specify an adapter (see also next example)
mRecyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(
feedLayoutManager) {
#Override
public void onLoadMore(int current_page) {
// do somthing...
loadMoreData(current_page);
}
});
/*qt2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent comm = new Intent(getActivity(), Comments.class);
quesText = qt2.getText().toString();
//comm.putExtra(quesText, Text );
startActivity(comm);
}
});
qt3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent comm = new Intent(getActivity(), Comments.class);
quesText = qt3.getText().toString();
//comm.putExtra(quesText, Text );
startActivity(comm);
}
});*/
return rootView;
}
public void loadData(int page) {
// Send an API request to retrieve appropriate data using the offset value as a parameter.
// --> Deserialize API response and then construct new objects to append to the adapter
// --> Notify the adapter of the changes
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Login.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
PostquesApi apiService = retrofit.create(PostquesApi.class);
Call<quesGetResponse> call = apiService.quesget(Integer.toString(j));
call.enqueue(new Callback<quesGetResponse>() {
#Override
public void onResponse(Call<quesGetResponse> call, Response<quesGetResponse> response) {
quesGetResponse decodedResponse = response.body();
if (decodedResponse != null) {
if (decodedResponse.ques1 != null && decodedResponse.quid1.compareTo(Login.user_id) != 0)
{
movieList.add(decodedResponse.ques1);
}
if (decodedResponse.ques2 != null && decodedResponse.quid2.compareTo(Login.user_id) != 0)
{
movieList.add(decodedResponse.ques2);
}
if (decodedResponse.ques3 != null && decodedResponse.quid3.compareTo(Login.user_id) != 0)
{
movieList.add(decodedResponse.ques3);
}
}
if (decodedResponse.ques1 == null || decodedResponse.ques2 == null || decodedResponse.ques3 == null) {
Context context = getActivity().getApplicationContext();
CharSequence text = "Sorry!! no more questions in the database...";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
j = j + 3;
}
#Override
public void onFailure(Call<quesGetResponse> call, Throwable t) {
}
});
}
private void loadMoreData(int current_page) {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Login.BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
PostquesApi apiService = retrofit.create(PostquesApi.class);
Call<quesGetResponse> call = apiService.quesget(Integer.toString(j));
call.enqueue(new Callback<quesGetResponse>() {
#Override
public void onResponse(Call<quesGetResponse> call, Response<quesGetResponse> response) {
quesGetResponse decodedResponse = response.body();
if (decodedResponse != null) {
if (decodedResponse.ques1 != null && decodedResponse.quid1.compareTo(Login.user_id) != 0)
{
movieList.add(decodedResponse.ques1);
}
if (decodedResponse.ques2 != null && decodedResponse.quid2.compareTo(Login.user_id) != 0)
{
movieList.add(decodedResponse.ques2);
}
if (decodedResponse.ques3 != null && decodedResponse.quid3.compareTo(Login.user_id) != 0)
{
movieList.add(decodedResponse.ques3);
}
}
if (decodedResponse.ques1 == null || decodedResponse.ques2 == null || decodedResponse.ques3 == null) {
Context context = getActivity().getApplicationContext();
CharSequence text = "Sorry!! no more questions in the database...";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
j = j + 3;
}
#Override
public void onFailure(Call<quesGetResponse> call, Throwable t) {
}
});
mAdapter.notifyDataSetChanged();
}
}
EndlessRecyclerOnScrollListener.java: The file that implements the logic for pagination.
package com.example.opinion;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
/**
* Created by manish on 7/20/2016.
*/
public abstract class EndlessRecyclerOnScrollListener extends
RecyclerView.OnScrollListener {
public static String TAG = EndlessRecyclerOnScrollListener.class
.getSimpleName();
private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold = 3;
int firstVisibleItem, visibleItemCount, totalItemCount;
private int current_page = 1;
private LinearLayoutManager mLinearLayoutManager;
public EndlessRecyclerOnScrollListener(
LinearLayoutManager linearLayoutManager) {
this.mLinearLayoutManager = linearLayoutManager;
}
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount = recyclerView.getChildCount();
totalItemCount = mLinearLayoutManager.getItemCount();
firstVisibleItem = mLinearLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if (totalItemCount > previousTotal) {
loading = false;
previousTotal = totalItemCount;
}
}
if (!loading
&& (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
// End has been reached
// Do something
current_page++;
onLoadMore(current_page);
loading = true;
}
}
public abstract void onLoadMore(int current_page);
}
If someone can review it and tell me the corrections needed in the above files or can direct me to some resource, it will be really appreciated.

I would suggest instead of using EndlessRecyclerOnScrollListener class and listening to the Recyclerview's scroll event you should watch inside MyAdapter class.
1. First add one interface
public interface GetNewDataEvents {
void getNewAdapterData();
}
2. Initialize that interface in MyAdapter class from where you are adding your data by implementing it.
3. you can easily find which item is being loading currently in bindViewHolder
using
if(position==(movieName.size()-1)
and in it you can easily call that interface method and load new data in it.
This thing denotes that second last item is being currently loading and you should add new data if any.
If you get new data you can easily load it into your adapter and call notifyItemRangeChanged with it to get performance and implementing best practices by not loading whole adapter with only few items changed.
if you want to take reference for it you can go here

Cannot resolve constructor adapter with listview using baseadapter

I want to know how to pass the argument to custom adapter . I'm trying to implement a YouTube video list using listview + baseadapter. I'm not sure how to populate properly the listview using the baseadapter
My error is:
Error:(67, 39) error: constructor VideoListAdapter in class YouTubeVideo.VideoListAdapter cannot be applied to given types;
required: Context
found: YouTubeVideo,int,List<Video>
reason: actual and formal argument lists differ in length
Here is my code:
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.crashlytics.android.Crashlytics;
import com.google.android.youtube.player.YouTubeApiServiceUtil;
import com.google.android.youtube.player.YouTubeInitializationResult;
import com.google.android.youtube.player.YouTubeThumbnailLoader;
import com.google.android.youtube.player.YouTubeThumbnailView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import io.fabric.sdk.android.Fabric;
public class YouTubeVideo extends AppCompatActivity {
public static List<Video> MyVideo = new ArrayList<Video>();
public static Map<String, Video> Video_Map = new HashMap<>();
private static void addItem(final Video currentVideo) {
MyVideo.add(currentVideo);
Video_Map.put(currentVideo.getVideoId(), currentVideo);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_you_tube_video);
Fabric.with(this, new Crashlytics());
//Check for any issues
final YouTubeInitializationResult result = YouTubeApiServiceUtil.isYouTubeApiServiceAvailable(this);
if (result != YouTubeInitializationResult.SUCCESS) {
//If there are any issues we can show an error dialog.
result.getErrorDialog(this, 0).show();
}
populateVideoList();
populateListView();
}
private void populateVideoList() {
addItem(new Video("tttG6SdnCd4", "Open in the YouTube App"));
addItem(new Video("x-hH_Txxzls", "Open in the YouTube App in fullscreen"));
addItem(new Video("TTh_qYMzSZk", "Open in the Standalone player in fullscreen"));
addItem(new Video("tttG6SdnCd4", "Open in the Standalone player in \"Light Box\" mode"));
addItem(new Video("x-hH_Txxzls", "Open in the YouTubeFragment"));
}
private void populateListView() {
ArrayAdapter<Video> adapter = new VideoListAdapter(YouTubeVideo.this, R.layout.video_view, MyVideo);
ListView list = (ListView) findViewById(R.id.videoListView);
list.setAdapter(adapter);
}
//------------------------------------------------------------------------------------------------------------------- 12/05/16
private class VideoListAdapter extends BaseAdapter implements YouTubeThumbnailView.OnInitializedListener {
private Context mContext;
private Map<View, YouTubeThumbnailLoader> mLoaders;
public VideoListAdapter(final Context context) {
mContext = context;
mLoaders = new HashMap<>();
}
#Override
public int getCount() {
return MyVideo.size();
}
#Override
public Object getItem(int position) {
return MyVideo.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
//------------------------------------------------------------------------------------------------------------------- 13/05/16
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View videoRow = convertView;
VideoHolder holder;
final Video currentVideo = MyVideo.get(position);
if (videoRow == null) {
//Create the row
final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
videoRow = inflater.inflate(R.layout.video_view, parent, false);
//Create the video holder
holder = new VideoHolder();
//Set the title
holder.title = (TextView) videoRow.findViewById(R.id.textView_title);
holder.title.setText(currentVideo.getVideoTitle());
//Initialise the thumbnail
holder.thumb = (YouTubeThumbnailView) videoRow.findViewById(R.id.imageView_thumbnail);
holder.thumb.setTag(currentVideo.getVideoId());
holder.thumb.initialize(mContext.getString(R.string.DEVELOPER_KEY), this);
videoRow.setTag(holder);
} else {
//Create it again
holder = (VideoHolder) videoRow.getTag();
final YouTubeThumbnailLoader loader = mLoaders.get(holder.thumb);
//Set the title
if (currentVideo != null) {
holder.title.setText(currentVideo.getVideoTitle());
if (loader == null) {
//Loader is currently initialising
holder.thumb.setTag(currentVideo.getVideoId());
} else {
//The loader is already initialised
loader.setVideo(currentVideo.getVideoId());
}
}
}
return videoRow;
}
#Override
public void onInitializationSuccess(YouTubeThumbnailView view, YouTubeThumbnailLoader loader) {
mLoaders.put(view, loader);
loader.setVideo((String) view.getTag());
}
#Override
public void onInitializationFailure(YouTubeThumbnailView thumbnailView, YouTubeInitializationResult errorReason) {
final String errorMessage = errorReason.toString();
Toast.makeText(mContext, errorMessage, Toast.LENGTH_LONG).show();
}
private class VideoHolder {
YouTubeThumbnailView thumb;
TextView title;
}
}
}

I can not find a constructor in VideoListAdapter with three parameters , I think you missed the following constructor in VideoListAdapter
public VideoListAdapter (Context context, int layoutResourceId,
List<Video> myvideos) {
super(activity, layoutResourceId, myvideos);
mContext = context;
}
or replace
ArrayAdapter<Video> adapter = new VideoListAdapter(YouTubeVideo.this, R.layout.video_view, MyVideo);
with
VideoListAdapter adapter = new VideoListAdapter(YouTubeVideo.this);

It is really easy to resolve it;
public VideoListAdapter (Context context, int layoutId, List lists) {
super(context);
mContext = context;
this.layoutId = layoutId;
this.lists = lists;
}
good luck!

Prevent RecyclerView showing previous content when scrolling

I have a RecyclerView with a GridLinearLayout and a custom adapter. The content of each item is a picture downloaded using a json and parsing it.
Basically is a grid of pictures.
Everything works almost fine, but however, when scrolling down the content, and the going up again, it shows the previous views in each item for less than a second, and then show the proper picture again.
What could I do to prevent or fix this? Thanks in advance for any help and/or guidance you could provide.
This is the adapter code:
package jahirfiquitiva.project.adapters;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.v7.graphics.Palette;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import jahirfiquitiva.project.activities.WallpapersActivity;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.WeakHashMap;
import jahirfiquitiva.project.R;
public class WallpapersAdapter extends RecyclerView.Adapter<WallpapersAdapter.WallsHolder> {
public interface ClickListener {
void onClick(WallsHolder view, int index, boolean longClick);
}
private ArrayList<HashMap<String, String>> data;
private final Context context;
private boolean usePalette = true;
private final ClickListener mCallback;
private final Map<String, Palette> mPaletteCache = new WeakHashMap<>();
public WallpapersAdapter(Context context, ClickListener callback) {
this.context = context;
this.data = new ArrayList<>();
this.mCallback = callback;
}
public void setData(ArrayList<HashMap<String, String>> data) {
this.data = data;
notifyDataSetChanged();
}
#Override
public WallsHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
return new WallsHolder(inflater.inflate(R.layout.wallpaper_item, parent, false));
}
#Override
public void onBindViewHolder(final WallsHolder holder, int position) {
Animation anim = AnimationUtils.loadAnimation(context, android.R.anim.fade_in);
HashMap<String, String> jsondata = data.get(position);
holder.name.setText(jsondata.get(WallpapersActivity.NAME));
final String wallurl = jsondata.get(WallpapersActivity.WALL);
holder.wall.startAnimation(anim);
holder.wall.setTag(wallurl);
Ion.with(context)
.load(wallurl)
.asBitmap()
.setCallback(new FutureCallback<Bitmap>() {
#Override
public void onCompleted(Exception e, Bitmap result) {
holder.progressBar.setVisibility(View.GONE);
if (e != null) {
e.printStackTrace();
} else if (holder.wall.getTag() != null && holder.wall.getTag().equals(wallurl)) {
holder.wall.setImageBitmap(result);
if (usePalette) {
Palette p;
if (mPaletteCache.containsKey(wallurl)) {
p = mPaletteCache.get(wallurl);
} else {
p = new Palette.Builder(result).generate();
mPaletteCache.put(wallurl, p);
}
if (p != null) {
Palette.Swatch wallSwatch = p.getVibrantSwatch();
if (wallSwatch != null) {
holder.titleBg.setBackgroundColor(wallSwatch.getRgb());
holder.titleBg.setAlpha(1);
holder.name.setTextColor(wallSwatch.getTitleTextColor());
holder.name.setAlpha(1);
}
}
}
}
}
});
}
#Override
public int getItemCount() {
return data.size();
}
public class WallsHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
public final View view;
public final ImageView wall;
public final TextView name;
public final ProgressBar progressBar;
public final LinearLayout titleBg;
WallsHolder(View v) {
super(v);
view = v;
wall = (ImageView) v.findViewById(R.id.wall);
name = (TextView) v.findViewById(R.id.name);
progressBar = (ProgressBar) v.findViewById(R.id.progress);
titleBg = (LinearLayout) v.findViewById(R.id.titlebg);
view.setOnClickListener(this);
view.setOnLongClickListener(this);
}
#Override
public void onClick(View v) {
int index = getLayoutPosition();
if (mCallback != null)
mCallback.onClick(this, index, false);
}
#Override
public boolean onLongClick(View v) {
int index = getLayoutPosition();
if (mCallback != null)
mCallback.onClick(this, index, true);
return false;
}
}
}

Overwrite onViewRecycled (VH holder) to set the image to null.
Like this:
public void onViewRecycled (VH holder) {
holder.wall.setImageBitmap(null);
}

As the name suggests RecyclerView recycles the views to optimize memory so it displays the content of previous view. Since you are loading the image from internet it takes little time to load the image so the content of previous image could be observed. You can do one of the following things.
1) Set a default image from local resource before loading actual image, preferably a small size image to preserve memory.something like this
//load default image first
holder.wall.setImageResource(R.id.your_default_image_resource);
//load actual image
Ion.with(context)
.load(wallurl)
.asBitmap()
.setCallback(new FutureCallback<Bitmap>() {
#Override
public void onCompleted(Exception e, Bitmap result) {
holder.progressBar.setVisibility(View.GONE);
if (e != null) {
e.printStackTrace();
} else if (holder.wall.getTag() != null && holder.wall.getTag().equals(wallurl)) {
holder.wall.setImageBitmap(result);
if (usePalette) {
Palette p;
if (mPaletteCache.containsKey(wallurl)) {
p = mPaletteCache.get(wallurl);
} else {
p = new Palette.Builder(result).generate();
mPaletteCache.put(wallurl, p);
}
if (p != null) {
Palette.Swatch wallSwatch = p.getVibrantSwatch();
if (wallSwatch != null) {
holder.titleBg.setBackgroundColor(wallSwatch.getRgb());
holder.titleBg.setAlpha(1);
holder.name.setTextColor(wallSwatch.getTitleTextColor());
holder.name.setAlpha(1);
}
}
}
}
}
});
2) Set the ImageView visibility to GONE/INVISIBLE before loading the image and make it VISIBLE again after the image is loaded.
//hide the imageview
holder.wall.setVisibility(View.INVISIBLE);
Ion.with(context)
.load(wallurl)
.asBitmap()
.setCallback(new FutureCallback<Bitmap>() {
#Override
public void onCompleted(Exception e, Bitmap result) {
holder.progressBar.setVisibility(View.GONE);
if (e != null) {
e.printStackTrace();
} else if (holder.wall.getTag() != null && holder.wall.getTag().equals(wallurl)) {
//show the imageview and set bitmap
holder.wall.setVisibility(View.VISIBLE);
holder.wall.setImageBitmap(result);
if (usePalette) {
Palette p;
if (mPaletteCache.containsKey(wallurl)) {
p = mPaletteCache.get(wallurl);
} else {
p = new Palette.Builder(result).generate();
mPaletteCache.put(wallurl, p);
}
if (p != null) {
Palette.Swatch wallSwatch = p.getVibrantSwatch();
if (wallSwatch != null) {
holder.titleBg.setBackgroundColor(wallSwatch.getRgb());
holder.titleBg.setAlpha(1);
holder.name.setTextColor(wallSwatch.getTitleTextColor());
holder.name.setAlpha(1);
}
}
}
}
}
});

I think you should add place holder like this:
Ion.with(context).load("http://example.com/image.png")
.withBitmap()
.placeholder(R.drawable.placeholder_image)
.error(R.drawable.error_image)
.intoImageView(imageView);
or set default image at first.
holder.wall.setImageResource(R.drawable.placeholder_image);

How to add a listview item to a whole other listview

So in my android app, I have two scrollable tabs which each contain Listview using a Fragment. One a list of apps and the other is blank. What I am aiming to do is add a plus button in place of where my checkbox is and duplicate that item in the other listview which is blank.
I have done research on this, but I have not found any successful examples on how to implement this.
Android - Add an item from one ListView to another ListView?
Here is my fragment that returns the apps
package com.spicycurryman.getdisciplined10.app;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageItemInfo;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import com.ibc.android.demo.appslist.app.ApkAdapter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class InstalledAppActivity extends Fragment
implements OnItemClickListener {
PackageManager packageManager;
ListView apkList;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
setHasOptionsMenu(true);
View rootView = inflater.inflate(R.layout.user_installed, container, false);
packageManager = getActivity().getPackageManager();
/*To filter out System apps*/
apkList = (ListView) rootView.findViewById(R.id.applist);
new LoadApplications(getActivity().getApplicationContext()).execute();
return rootView;
}
/**
* Return whether the given PackageInfo represents a system package or not.
* User-installed packages (Market or otherwise) should not be denoted as
* system packages.
*
* #param pkgInfo
* #return boolean
*/
private boolean isSystemPackage(PackageInfo pkgInfo) {
return ((pkgInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) ? true
: false;
}
private boolean isSystemPackage1(PackageInfo pkgInfo) {
return ((pkgInfo.applicationInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0) ? false
: true;
}
// Don't need in Fragment
/*#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.block, menu);
// super.onCreateOptionsMenu(menu,inflater);
}*/
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
}
private class LoadApplications extends AsyncTask<Void, Void, Void> {
Context mContext;
private ProgressDialog pDialog;
List<PackageInfo> packageList1 = new ArrayList<PackageInfo>();
public LoadApplications(Context context){
Context mContext = context;
}
#Override
protected Void doInBackground(Void... params) {
List<PackageInfo> packageList = packageManager
.getInstalledPackages(PackageManager.GET_PERMISSIONS);
/* List<ApplicationInfo> list = mContext.getPackageManager().getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
for(int n = 0;n<list.size();n++){
if ((list.get(n).flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP))
}*/
for(PackageInfo pi : packageList) {
boolean b = isSystemPackage(pi);
boolean c = isSystemPackage1(pi);
if(!b || !c ) {
packageList1.add(pi);
}
}
//sort by application name
final PackageItemInfo.DisplayNameComparator comparator = new PackageItemInfo.DisplayNameComparator(packageManager);
Collections.sort(packageList1, new Comparator<PackageInfo>() {
#Override
public int compare(PackageInfo lhs, PackageInfo rhs) {
return comparator.compare(lhs.applicationInfo, rhs.applicationInfo);
}
});
return null;
}
#Override
protected void onCancelled() {
super.onCancelled();
}
#Override
protected void onPreExecute() {
pDialog = new ProgressDialog(InstalledAppActivity.this.getActivity());
pDialog.setMessage("Loading your apps...");
pDialog.show();
}
#Override
protected void onPostExecute(Void result) {
apkList.setAdapter(new ApkAdapter(getActivity(), packageList1, packageManager));
if (pDialog.isShowing()){
pDialog.dismiss();
}
super.onPostExecute(result);
}
#Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
}
And here is my adapter class:
package com.ibc.android.demo.appslist.app;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
import com.spicycurryman.getdisciplined10.app.R;
import java.util.List;
public class ApkAdapter extends BaseAdapter {
List<PackageInfo> packageList;
Activity context;
PackageManager packageManager;
boolean[] itemChecked;
public ApkAdapter(Activity context, List<PackageInfo> packageList,
PackageManager packageManager) {
super();
this.context = context;
this.packageList = packageList;
this.packageManager = packageManager;
itemChecked = new boolean[packageList.size()];
}
private class ViewHolder {
TextView apkName;
CheckBox ck1;
}
public int getCount() {
return packageList.size();
}
public Object getItem(int position) {
return packageList.get(position);
}
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.installed_apps, null);
holder = new ViewHolder();
holder.apkName = (TextView) convertView
.findViewById(R.id.appname);
holder.ck1 = (CheckBox) convertView
.findViewById(R.id.checkBox1);
convertView.setTag(holder);
//holder.ck1.setTag(packageList.get(position));
} else {
holder = (ViewHolder) convertView.getTag();
}
// ViewHolder holder = (ViewHolder) convertView.getTag();
PackageInfo packageInfo = (PackageInfo) getItem(position);
Drawable appIcon = packageManager
.getApplicationIcon(packageInfo.applicationInfo);
String appName = packageManager.getApplicationLabel(
packageInfo.applicationInfo).toString();
appIcon.setBounds(0, 0, 75, 75);
holder.apkName.setCompoundDrawables(appIcon, null, null, null);
holder.apkName.setCompoundDrawablePadding(15);
holder.apkName.setText(appName);
holder.ck1.setChecked(false);
if (itemChecked[position])
holder.ck1.setChecked(true);
else
holder.ck1.setChecked(false);
holder.ck1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (holder.ck1.isChecked())
itemChecked[position] = true;
else
itemChecked[position] = false;
}
});
return convertView;
}
}
How would I go about achieving this?

So what you are doing is, you are populating a listview of installed apps using package manager. Add a plus button in place of the checkbox. Now get installed apps similar to this -
List<PackageInfo> packageList1 = packageManager.getInstalledPackages(0);
final PackageItemInfo.DisplayNameComparator comparator = new PackageItemInfo.DisplayNameComparator(packageManager);
Collections.sort(packageList1, new Comparator<PackageInfo>() {
#Override
public int compare(PackageInfo lhs, PackageInfo rhs) {
return comparator.compare(lhs.applicationInfo, rhs.applicationInfo);
}
});
for (int i = 0; i < packageList1.size(); i++) {
PackageInfo PackInfo = packageList1.get(i);
if (((PackInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) != true) {
//Add to adapter
}
}
}
Now, create a public string array in the activity which is holding the tabs. When you click on the plus button add the packagename to the array.
Now on the other tab use the same adapter, but here before adding it to the adapter check if it is found in the string array using the index. Something like -
List<PackageInfo> packageList1 = packageManager.getInstalledPackages(0);
final PackageItemInfo.DisplayNameComparator comparator = new PackageItemInfo.DisplayNameComparator(packageManager);
Collections.sort(packageList1, new Comparator<PackageInfo>() {
#Override
public int compare(PackageInfo lhs, PackageInfo rhs) {
return comparator.compare(lhs.applicationInfo, rhs.applicationInfo);
}
});
for (int i = 0; i < packageList1.size(); i++) {
PackageInfo PackInfo = packageList1.get(i);
if (((PackInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) != true) {
if (Mainactivity.array contains String PackageName= PackInfo.packageName)
{
//Add to adapter
}
}
}
}
To persist the selected apps, add their package name to shared_preferences.
edit :
In your fragment's LoadApplications class, you retrieve a list of installed apps. On the second fragment use the same code, but just add one more condition
for(PackageInfo pi : packageList) {
boolean b = isSystemPackage(pi);
boolean c = isSystemPackage1(pi);
if(!b || !c ) {
if (array contains packagename){
packageList1.add(pi);
}
}

List<UserApps> packageListBlocked = new ArrayList<UserApps>();
holder.ck1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if (holder.ck1.isChecked())
itemChecked[position] = true;
packageListBlocked.add(packageList.get(position));
else
itemChecked[position] = false;
}
});
ArrayList can hold duplicate data, so be cautious while adding.
Now you have all checkedItems in packageListBlocked pass it on to next tab and set data, make sure you call adapter.notifyDataSetChanged();

Android Beginner: ListView with Images and CheckBoxes

I am a beginner programmer so please bear with me. I have been able to create a listview with images in it and thought I could modify it to add a checkbox. However, this setup does not work. Any suggestions to how I may fix my code to create a listview with both an image and checkbox?
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.ParseException;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class CheckboxList extends ListActivity{
private LayoutInflater mInflater;
private Vector<RowData> data;
RowData rd;
static CheckBox box0,box1,box2,box3;
static final String[] title = new String[] {
"Box 1", "Box 2",
"Box 3 ","Box 4" };
static final CheckBox[] boxes= new CheckBox[] {box0,box1,box2,box3};
private Integer[] imgid = {
R.drawable.magnum,R.drawable.mg,R.drawable.mk,
R.drawable.mk46};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mInflater = (LayoutInflater) getSystemService(
Activity.LAYOUT_INFLATER_SERVICE);
data = new Vector<RowData>();
for(int i=0;i<title.length;i++){
try {
rd = new RowData(i,title[i],boxes[i]);
} catch (ParseException e) {
e.printStackTrace();
}
data.add(rd);
}
CustomAdapter adapter = new CustomAdapter(this, R.layout.check_list,
R.id.title, data);
setListAdapter(adapter);
getListView().setTextFilterEnabled(true);
}
public void onListItemClick(ListView parent, View v, int position,
long id) {
Toast.makeText(getApplicationContext(), "You have selected "
+(position+1)+"th item", Toast.LENGTH_SHORT).show();
}
private class RowData {
protected int mId;
protected String mTitle;
protected CheckBox mCBox;
RowData(int id,String title,CheckBox cbox){
mId=id;
mTitle = title;
mCBox=cbox;
}
#Override
public String toString() {
return mId+" "+mTitle+" "+mCBox;
}
}
private class CustomAdapter extends ArrayAdapter<RowData> {
public CustomAdapter(Context context, int resource,
int textViewResourceId, List<RowData> objects) {
super(context, resource, textViewResourceId, objects);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
TextView title = null;
CheckBox box = null;
ImageView i11=null;
RowData rowData= getItem(position);
if(null == convertView){
convertView = mInflater.inflate(R.layout.check_list, null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}
holder = (ViewHolder) convertView.getTag();
title = holder.gettitle();
title.setText(rowData.mTitle);
box = holder.getcheckbox();
box.setChecked(false);
i11=holder.getImage();
i11.setImageResource(imgid[rowData.mId]);
return convertView;
}
private class ViewHolder {
private View mRow;
private TextView title = null;
private CheckBox cbox = null;
private ImageView i11=null;
public ViewHolder(View row) {
mRow = row;
}
public TextView gettitle() {
if(null == title){
title = (TextView) mRow.findViewById(R.id.title);
}
return title;
}
public CheckBox getcheckbox() {
if(null == cbox){
cbox = (CheckBox) mRow.findViewById(R.id.checkBox);
}
return cbox;
}
public ImageView getImage() {
if(null == i11){
i11 = (ImageView) mRow.findViewById(R.id.img);
}
return i11;
}
}
} }

Look at this links.it may helpfull......
http://www.vogella.com/articles/AndroidListView/article.html
CustomListview With Images and Checkboxes Example