As described in manual, to use custom class in .aidl files, it must to implement Parcelable interface :
Code:
package com.shadower;
import android.os.Parcel;
import android.os.Parcelable;
public class Params implements Parcelable{
private long timeout;
public static final Parcelable.Creator<Params> CREATOR = new Parcelable.Creator<Params>() {
@Override
public Params createFromParcel(Parcel in) {
return new Params(in);
}
@Override
public Params[] newArray(int size) {
return new Params[size];
}
};
public Params(Parcel in) {
timeout = in.readLong();
}
public void writeToParcel(Parcel out) {
out.writeLong(timeout);
}
public void setTimeOut(long timeout) {
this.timeout = timeout;
}
public long getTimeout() {
return timeout;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeLong(timeout);
}
}
then must be imported into .aidl:
Code:
package com.shadower;
import com.shadower.IShadowerServiceCallback;
import com.shadower.Params;
....
but **** happens :
Code:
couldn't find import for class com.shadower.Params IShadowerService.aidl /shadower/src/com/shadower line 5 Android AIDL Problem
wtf is going on?
I make an application for Android and I'm using CursorTreeAdapter as ExpandableListView. Now I want to use search box for display the filtered ExpandableListView items. Like this:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Here's the code what I've so far:
MainActivity.java:
Code:
package com.example.android.exlistexample;
import java.util.HashMap;
import android.app.SearchManager;
import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.LoaderManager;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.util.Log;
import android.widget.ExpandableListView;
import android.widget.SearchView;
import android.widget.SearchView.OnCloseListener;
import android.widget.SearchView.OnQueryTextListener;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.example.android.exlistexample.provider.CfpContract;
public class MainActivity extends SherlockFragmentActivity {
private SearchView search;
private MyListAdapter listAdapter;
private ExpandableListView myList;
private final String DEBUG_TAG = getClass().getSimpleName().toString();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
search = (SearchView) findViewById(R.id.search);
search.setSearchableInfo(searchManager
.getSearchableInfo(getComponentName()));
search.setIconifiedByDefault(false);
search.setOnQueryTextListener(new OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
listAdapter.filterData(query);
expandAll();
return false;
}
@Override
public boolean onQueryTextChange(String query) {
listAdapter.filterData(query);
expandAll();
return false;
}
});
search.setOnCloseListener(new OnCloseListener() {
@Override
public boolean onClose() {
listAdapter.filterData("");
expandAll();
return false;
}
});
// get reference to the ExpandableListView
myList = (ExpandableListView) findViewById(R.id.expandableList);
// create the adapter
listAdapter = new MyListAdapter(null, MainActivity.this);
// attach the adapter to the list
myList.setAdapter(listAdapter);
Loader<Cursor> loader = getSupportLoaderManager().getLoader(-1);
if (loader != null && !loader.isReset()) {
runOnUiThread(new Runnable() {
public void run() {
getSupportLoaderManager().restartLoader(-1, null,
mSpeakersLoaderCallback);
}
});
} else {
runOnUiThread(new Runnable() {
public void run() {
getSupportLoaderManager().initLoader(-1, null,
mSpeakersLoaderCallback).forceLoad();
;
}
});
}
}
@Override
public void onResume() {
super.onResume();
getApplicationContext().getContentResolver().registerContentObserver(
CfpContract.Groups.CONTENT_URI, true, mSpeakerChangesObserver);
}
@Override
public void onPause() {
super.onPause();
getApplicationContext().getContentResolver().unregisterContentObserver(
mSpeakerChangesObserver);
}
// method to expand all groups
private void expandAll() {
int count = listAdapter.getGroupCount();
for (int i = 0; i < count; i++) {
myList.expandGroup(i);
}
}
public LoaderManager.LoaderCallbacks<Cursor> mSpeakersLoaderCallback = new LoaderCallbacks<Cursor>() {
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
Log.d(DEBUG_TAG, "onCreateLoader for loader_id " + id);
CursorLoader cl = null;
if (id != -1) {
if (id == 7) {
cl = new CursorLoader(getApplicationContext(),
CfpContract.Classes.CONTENT_URI,
MyListAdapter.CLASSES_PROJECTION, null, null,
CfpContract.Classes.DEFAULT_SORT);
} else if (id == 8) {
cl = new CursorLoader(getApplicationContext(),
CfpContract.Teachers.CONTENT_URI,
MyListAdapter.TEACHERS_PROJECTION, null, null,
CfpContract.Teachers.DEFAULT_SORT);
}
} else {
// group cursor
cl = new CursorLoader(getApplicationContext(),
CfpContract.Groups.CONTENT_URI,
MyListAdapter.GROUPS_PROJECTION, null, null,
CfpContract.Groups.DEFAULT_SORT);
}
return cl;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Swap the new cursor in.
int id = loader.getId();
Log.d("Dump Cursor MainActivity",
DatabaseUtils.dumpCursorToString(data));
Log.d(DEBUG_TAG, "onLoadFinished() for loader_id " + id);
if (id != -1) {
// child cursor
if (!data.isClosed()) {
Log.d(DEBUG_TAG, "data.getCount() " + data.getCount());
HashMap<Integer, Integer> groupMap = listAdapter
.getGroupMap();
try {
int groupPos = groupMap.get(id);
Log.d(DEBUG_TAG, "onLoadFinished() for groupPos "
+ groupPos);
listAdapter.setChildrenCursor(groupPos, data);
} catch (NullPointerException e) {
Log.w("DEBUG",
"Adapter expired, try again on the next query: "
+ e.getMessage());
}
}
} else {
listAdapter.setGroupCursor(data);
}
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
// This is called when the last Cursor provided to onLoadFinished()
// is about to be closed.
int id = loader.getId();
Log.d(DEBUG_TAG, "onLoaderReset() for loader_id " + id);
if (id != 1) {
// child cursor
try {
listAdapter.setChildrenCursor(id, null);
} catch (NullPointerException e) {
Log.w(DEBUG_TAG,
"Adapter expired, try again on the next query: "
+ e.getMessage());
}
} else {
listAdapter.setGroupCursor(null);
}
}
};
private ContentObserver mSpeakerChangesObserver = new ContentObserver(
new Handler()) {
@Override
public void onChange(boolean selfChange) {
if (getApplicationContext() != null) {
runOnUiThread(new Runnable() {
public void run() {
getSupportLoaderManager().restartLoader(-1, null,
mSpeakersLoaderCallback);
}
});
}
}
};
}
MyListAdapter.java:
Code:
package com.example.android.exlistexample;
import java.util.HashMap;
import android.content.Context;
import android.database.Cursor;
import android.provider.BaseColumns;
import android.support.v4.content.Loader;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorTreeAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.android.exlistexample.provider.CfpContract;
import com.example.android.exlistexample.provider.CfpContract.Groups;
import com.joanzapata.android.iconify.Iconify;
import com.joanzapata.android.iconify.Iconify.IconValue;
public class MyListAdapter extends CursorTreeAdapter {
public HashMap<String, View> childView = new HashMap<String, View>();
/**
* The columns we are interested in from the database
*/
protected static final String[] GROUPS_PROJECTION = new String[] {
BaseColumns._ID, CfpContract.Groups.GROUP_ID,
CfpContract.Groups.GROUP_NAME, CfpContract.Groups.GROUP_IMAGE, };
protected static final String[] CLASSES_PROJECTION = new String[] {
BaseColumns._ID, CfpContract.Classes.CLASS_ID,
CfpContract.Classes.CLASS_NAME, CfpContract.Classes.CLASS_CAT, };
protected static final String[] TEACHERS_PROJECTION = new String[] {
BaseColumns._ID, CfpContract.Teachers.TEACHER_ID,
CfpContract.Teachers.TEACHER_NAME,
CfpContract.Teachers.TEACHER_SHORT,
CfpContract.Teachers.TEACHER_OPLEIDINGEN, };
private final String DEBUG_TAG = getClass().getSimpleName().toString();
protected final HashMap<Integer, Integer> mGroupMap;
private MainActivity mActivity;
private LayoutInflater mInflater;
public MyListAdapter(Cursor cursor, Context context) {
super(cursor, context);
mActivity = (MainActivity) context;
mInflater = LayoutInflater.from(context);
mGroupMap = new HashMap<Integer, Integer>();
}
@Override
public View newGroupView(Context context, Cursor cursor,
boolean isExpanded, ViewGroup parent) {
final View view = mInflater.inflate(R.layout.list_group, parent, false);
return view;
}
@Override
public void bindGroupView(View view, Context context, Cursor cursor,
boolean isExpanded) {
TextView lblListHeader = (TextView) view
.findViewById(R.id.lblListHeader);
if (lblListHeader != null) {
lblListHeader.setText(cursor.getString(cursor
.getColumnIndex(Groups.GROUP_NAME)));
ImageView groupIcon = (ImageView) view
.findViewById(R.id.lblListHeaderIcon);
groupIcon.setImageResource(cursor.getInt(cursor
.getColumnIndex(Groups.GROUP_IMAGE)));
}
TextView IndicatorText = (TextView) view
.findViewById(R.id.lblListHeaderIndicator);
if (IndicatorText != null) {
if (isExpanded) {
Iconify.setIcon(IndicatorText, IconValue.icon_caret_up);
} else {
Iconify.setIcon(IndicatorText, IconValue.icon_caret_down);
}
}
}
@Override
public View newChildView(Context context, Cursor cursor,
boolean isLastChild, ViewGroup parent) {
final View view = mInflater.inflate(R.layout.list_item, parent, false);
return view;
}
@Override
public void bindChildView(View view, Context context, Cursor cursor,
boolean isLastChild) {
TextView txtListChild = (TextView) view.findViewById(R.id.lblListItem);
txtListChild.setText(cursor.getString(2));
}
protected Cursor getChildrenCursor(Cursor groupCursor) {
// Given the group, we return a cursor for all the children within that
// group
int groupPos = groupCursor.getPosition();
int groupId = groupCursor.getInt(groupCursor
.getColumnIndex(BaseColumns._ID));
Log.d(DEBUG_TAG, "getChildrenCursor() for groupPos " + groupPos);
Log.d(DEBUG_TAG, "getChildrenCursor() for groupId " + groupId);
mGroupMap.put(groupId, groupPos);
Loader loader = mActivity.getSupportLoaderManager().getLoader(groupId);
if (loader != null && !loader.isReset()) {
mActivity.getSupportLoaderManager().restartLoader(groupId, null,
mActivity.mSpeakersLoaderCallback);
} else {
mActivity.getSupportLoaderManager().initLoader(groupId, null,
mActivity.mSpeakersLoaderCallback);
}
return null;
}
// Access method
public HashMap<Integer, Integer> getGroupMap() {
return mGroupMap;
}
public void filterData(String query) {
// TODO Filter the data here
}
}
I have very considerably simplified and cleaned the code (so that you guys that not need to do).
As you can see, I've in total 3 cursors (1 for the groups and 2 for the children). The data is synced from a local database and put in a Content Provider. (The database is from here and the provider from here). From there I insert it into the CursorTreeAdapter. (The most of the loader functions is from here).
The only thing is now how do I implement a search? Should I do it trough Content Provider or a raw query in the database? I would like that the results of both children tables is displayed. I think because it's easy to make a fault while typing that `tokenize=porter` is a option in my case.
I've tried this in MyListAdapter.java (with FilterQueryProvider as someone suggested on Stack Overflow):
Code:
public void filterList(CharSequence constraint) {
final Cursor oldCursor = getCursor();
setFilterQueryProvider(filterQueryProvider);
getFilter().filter(constraint, new FilterListener() {
public void onFilterComplete(int count) {
// assuming your activity manages the Cursor
// (which is a recommended way)
notifyDataSetChanged();
// stopManagingCursor(oldCursor);
// final Cursor newCursor = getCursor();
// startManagingCursor(newCursor);
// // safely close the oldCursor
if (oldCursor != null && !oldCursor.isClosed()) {
oldCursor.close();
}
}
});
}
private FilterQueryProvider filterQueryProvider = new FilterQueryProvider() {
public Cursor runQuery(CharSequence constraint) {
// assuming you have your custom DBHelper instance
// ready to execute the DB request
String s = '%' + constraint.toString() + '%';
return mActivity.getContentResolver().query(CfpContract.Classes.CONTENT_URI,
MyListAdapter.CLASSES_PROJECTION,
CfpContract.Classes.CLASS_NAME + " LIKE ? OR " + CfpContract.Classes.CLASS_CAT + " LIKE ?",
new String[] { s, s },
null);
}
};
And this in MainActivity.java:
Code:
search.setOnQueryTextListener(new OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
listAdapter.filterList(query);
expandAll();
return false;
}
@Override
public boolean onQueryTextChange(String query) {
listAdapter.filterList(query);
expandAll();
return false;
}
});
search.setOnCloseListener(new OnCloseListener() {
@Override
public boolean onClose() {
listAdapter.filterList("");
expandAll();
return false;
}
});
But then I get these errors when I try to search:
Code:
12-20 13:20:19.449: E/CursorWindow(28747): Failed to read row 0, column -1 from a CursorWindow which has 96 rows, 4 columns.
12-20 13:20:19.449: D/AndroidRuntime(28747): Shutting down VM
12-20 13:20:19.449: W/dalvikvm(28747): threadid=1: thread exiting with uncaught exception (group=0x415c62a0)
12-20 13:20:19.499: E/AndroidRuntime(28747): FATAL EXCEPTION: main
12-20 13:20:19.499: E/AndroidRuntime(28747): java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
What I'm doing wrong? Or is this because I'm only return 1 query (Classes) instead of 2 (Classes and Teachers) in runQuery?
I hope that someone can point me in a good direction.
I am writing an IRC Client, and so far as long as I dont send the app to the background and try to restore it it works fine. Tabs for multiple channels, the connected socket is in a bound service (started separately via INTENT and a startService call), etc and so on.
However, whenever I send the app to the background, then bring it back forward, the socket closes. I would have the same issue with screen rotation but I found the config setting that stops it from going through destroy/create on rotation. If I figure this out I may actually get rid of that since the issue will have been solved.
The other issue I seem to be having is that it takes a long time to re-bind to the service, and I have no idea why (the initial binding and startup is pretty quick, but re-binding to it seems to take forever, and when It does re-bind, the socket is closed).
Here are the code samples that I feel to be relevant, let me know if there's something more specific you want to see.
Code:
//This is the Service in question
public class ConnectionService extends Service{
private BlockingQueue<String> MessageQueue;
public final IBinder myBind = new ConnectionBinder();
public class ConnectionBinder extends Binder {
ConnectionService getService() {
return ConnectionService.this;
}
}
private Socket socket;
private BufferedWriter writer;
private BufferedReader reader;
private IRCServer server;
private WifiManager.WifiLock wLock;
private Thread readThread = new Thread(new Runnable() {
@Override
public void run() {
try {
String line;
while ((line = reader.readLine( )) != null) {
//message parsing stuff
}
}
catch (Exception e) {}
}
});
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if(MessageQueue == null)
MessageQueue = new LinkedBlockingQueue<String>();
return Service.START_STICKY;
}
@Override
public IBinder onBind(Intent arg0) {
return myBind;
}
@Override
public boolean stopService(Intent name) {
try {
socket.close();
wLock.release();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return super.stopService(name);
}
@Override
public void onDestroy()
{//I put this here so I had a breakpoint in place to make sure this wasn't firing instead of stopService
try {
socket.close();
wLock.release();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
super.onDestroy();
}
public void SendMessage(String message)
{
try {
writer.write(message + "\r\n");
writer.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
public String readLine()
{//this is called by the activity which consumes the service. Its just an accessor to MessageQueue
try {
if(!isConnected())
return null;
else
return MessageQueue.take();
} catch (InterruptedException e) {
return "";
}
}
public boolean ConnectToServer(IRCServer newServer)
{
try {
//create a new message queue (connecting to a new server)
MessageQueue = new LinkedBlockingQueue<String>();
//lock the wifi
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wLock = wifiManager.createWifiLock(WifiManager.WIFI_MODE_FULL, "LockTag");
wLock.acquire();
server = newServer;
//connect to server
socket = new Socket();
socket.setKeepAlive(true);
socket.setSoTimeout(60000);
socket.connect(new InetSocketAddress(server.NAME, Integer.parseInt(server.PORT)), 10000);
writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//run basic login scripts.
String line;
while ((line = reader.readLine( )) != null) {
//server initialization stuff
}
//start the reader thread AFTER the primary login!!!
CheckStartReader();
if(server.START_CHANNEL == null || server.START_CHANNEL == "")
{
server.WriteCommand("/join " + server.START_CHANNEL);
}
//we're done here, go home everyone
} catch (NumberFormatException e) {
return false;
} catch (IOException e) {
return false;
}
return true;
}
private void queueMessage(String line) {
try {
MessageQueue.put(line);
} catch (InterruptedException e) {
}
}
public boolean isConnected()
{
return socket.isConnected();
}
public void CheckStartReader()
{
if(this.isConnected() && !readThread.isAlive())
readThread.start();
}
}
Code:
//Here are the relevant portions of the hosting Activity that connects to the service
//NOTE: THE FOLLOWING CODE IS PART OF THE ACTIVITY, NOT THE SERVICE
private ConnectionService conn;
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
conn = ((ConnectionService.ConnectionBinder)service).getService();
//debug toast
Toast.makeText(main_tab_page.this, "Connected", Toast.LENGTH_SHORT)
.show();
synchronized (_serviceConnWait) {
_serviceConnWait.notify();
}
}
@Override
public void onServiceDisconnected(ComponentName name) {
conn = null;//does this even run? Breakpoint here
}
};
@Override
protected void onSaveInstanceState(Bundle state){
super.onSaveInstanceState(state);
state.putParcelable("Server", server);
state.putString("Window", CurrentTabWindow.GetName());
//have to unbind, othewise we get that leaked service exception
unbindService(mConnection);
}
@Override
protected void onDestroy()
{
super.onDestroy();
if(this.isFinishing())
stopService(new Intent(this, ConnectionService.class));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_tab_page);
localTabHost = (TabHost)findViewById(R.id.tabHostMain);
localTabHost.setup();
localTabHost.setOnTabChangedListener(new tabChange());
_serviceConnWait = new Object();
if(savedInstanceState == null)
{//initial startup, coming from Intent to start
//get server definition
server = (IRCServer)this.getIntent().getParcelableExtra(IRC_WINDOW);
server.addObserver(this);
AddTabView(server);
//this should only run the first time, all other calls to OnCreate should have something in SavedInstanceState
startService(new Intent(this, ConnectionService.class));
}
else
{
server = (IRCServer)savedInstanceState.getParcelable("Server");
String windowName = savedInstanceState.getString("Window");
//Add Needed Tabs
//Server
if(!(windowName.equals(server.GetName())))
AddTabView(server);
//channels
for(IRCChannel c : server.GetAllChannels())
if(!(windowName.equals(c.GetName())))
AddTabView(c);
//reset each view's text (handled by tabChange)
if(windowName.equals(server.GetName()))
SetCurrentTab(server.NAME);
else
SetCurrentTab(windowName);
ResetMainView(CurrentTabWindow.GetWindowTextSpan());
//Rebind to service
BindToService(new Intent(this, ConnectionService.class));
}
}
@Override
protected void onStart()
{
super.onStart();
final Intent ServiceIntent = new Intent(this, ConnectionService.class);
//check start connection service
final Thread serverConnect = new Thread(new Runnable() {
@Override
public void run() {
if(!BindToService(ServiceIntent))
return;
server.conn = conn;
conn.ConnectToServer(server);
server.StartReader();
if(server.START_CHANNEL != null && !server.START_CHANNEL.equals(""))
{
IRCChannel chan = server.FindChannel(server.START_CHANNEL);
if(chan != null)
{
AddTabView(chan);
}
else
{
server.JoinChannel(server.START_CHANNEL);
chan = server.FindChannel(server.START_CHANNEL);
AddTabView(chan);
}
}
}
});
serverConnect.start();
}
private boolean BindToService(Intent ServiceIntent)
{
int tryCount = 0;
bindService(ServiceIntent, mConnection, Context.BIND_AUTO_CREATE);
while(conn == null && tryCount < 10)
{
tryCount++;
try {
synchronized (_serviceConnWait) {
_serviceConnWait.wait(1500);
}
}
catch (InterruptedException e) {
//do nothing
}
}
return conn != null;
}
Logcat...well...there isn't really any exception thrown, the code runs just fine...except that it closes the socket. I suppose that counts as an exception. Whenever I run the socket write command It throws a "Socket Closed" exception at me. No other crash involved.
I am trying to start a new certain Activity based on which page I am clicking on in a Gridview.
I tried to understand the Sample GridViewPager which is coming along with the sdk and trying to adapt the given explanation on stackoverflow (question # 26343337). But I really don't know how to bring these two things together and even where to start.
The first java.file Selection
Code:
public class Selection extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.selection_grid);
final GridViewPager pager = (GridViewPager) findViewById(R.id.pager);
pager.setAdapter(new Workers(this, getFragmentManager()));
DotsPageIndicator dotsPageIndicator = (DotsPageIndicator) findViewById(R.id.page_indicator);
dotsPageIndicator.setPager(pager);
}
}
and the second java.file Users (thats the Adapter):
Code:
public class Users extends FragmentGridPagerAdapter {
private static final int TRANSITION_DURATION_MILLIS = 100;
private final Context mContext;
private List<Row> mRows;
private ColorDrawable mDefaultBg;
private ColorDrawable mClearBg;
public Users (Context ctx, FragmentManager fm) {
super(fm);
mContext = ctx;
mRows = new ArrayList<Workers.Row>();
mRows.add(new Row(cardFragment(R.string.title, R.string.user1)));
mRows.add(new Row(cardFragment(R.string.title, R.string.user2)));
mRows.add(new Row(cardFragment(R.string.title, R.string.user3)));
mRows.add(new Row(cardFragment(R.string.title, R.string.user4)));
// In case in one row several cardFragments are needed
// mRows.add(new Row(
// cardFragment(R.string.cards_title, R.string.cards_text),
// cardFragment(R.string.expansion_title, R.string.expansion_text)));
mDefaultBg = new ColorDrawable(R.color.dark_grey);
mClearBg = new ColorDrawable(android.R.color.transparent);
}
LruCache<Integer, Drawable> mRowBackgrounds = new LruCache<Integer, Drawable>(3) {
@Override
protected Drawable create(final Integer row) {
int resid = BG_IMAGES[row % BG_IMAGES.length];
new DrawableLoadingTask(mContext) {
@Override
protected void onPostExecute(Drawable result) {
TransitionDrawable background = new TransitionDrawable(new Drawable[] {
mDefaultBg,
result
});
mRowBackgrounds.put(row, background);
notifyRowBackgroundChanged(row);
background.startTransition(TRANSITION_DURATION_MILLIS);
}
}.execute(resid);
return mDefaultBg;
}
};
private Fragment cardFragment(int titleRes, int textRes) {
Resources res = mContext.getResources();
CardFragment fragment =
CardFragment.create(res.getText(titleRes), res.getText(textRes));
// Add some extra bottom margin to leave room for the page indicator
fragment.setCardMarginBottom(
res.getDimensionPixelSize(R.dimen.card_margin_bottom));
return fragment;
}
static final int[] BG_IMAGES = new int[] {
R.drawable.user1,
R.drawable.user2,
R.drawable.user3,
R.drawable.user4
};
/** A convenient container for a row of fragments. */
private class Row {
final List<Fragment> columns = new ArrayList<Fragment>();
public Row(Fragment... fragments) {
for (Fragment f : fragments) {
add(f);
}
}
public void add(Fragment f) {
columns.add(f);
}
Fragment getColumn(int i) {
return columns.get(i);
}
public int getColumnCount() {
return columns.size();
}
}
@Override
public Fragment getFragment(int row, int col) {
Row adapterRow = mRows.get(row);
return adapterRow.getColumn(col);
}
@Override
public Drawable getBackgroundForRow(final int row) {
return mRowBackgrounds.get(row);
}
@Override
public int getRowCount() {
return mRows.size();
}
@Override
public int getColumnCount(int rowNum) {
return mRows.get(rowNum).getColumnCount();
}
class DrawableLoadingTask extends AsyncTask<Integer, Void, Drawable> {
private static final String TAG = "Loader";
private Context context;
DrawableLoadingTask(Context context) {
this.context = context;
}
@Override
protected Drawable doInBackground(Integer... params) {
Log.d(TAG, "Loading asset 0x" + Integer.toHexString(params[0]));
return context.getResources().getDrawable(params[0]);
}
}
}
I have an Activity that contains a Fragment with a ViewPager. Then I call a method of a Fragment within the ViewPager. But if that Fragment then calls getParentFragment(), it returns null.
Why is getParentFragment() null?
The main Fragment that contains a ViewPager:
Code:
public class MyFragment extends Fragment {
private TabLayout mTabLayout;
private ViewPager mViewPager;
private ViewPagerAdapter mAdapter;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
View view = getView();
// Setup the ViewPager
mViewPager = (ViewPager) view.findViewById(R.id.container);
setupViewPager(mViewPager);
// Setup the TabLayout
mTabLayout = (TabLayout) view.findViewById(R.id.tabs);
mTabLayout.setupWithViewPager(mViewPager);
}
// This method is called from Activity
public void callNestedFragment() {
if (isDetached()) {
return;
}
((Fragment0) mViewPager.getItem(0)).testMethod();
}
}
The nested Fragment (inside mViewPager):
Code:
public class Fragment0 extends Fragment {
...
public void testMethod() {
if (isDetached()) {
return;
}
// Why is getParentFragment() null?
Log.i(TAG, "Parent fragment:" + getParentFragment());
return;
}
}
The ViewPagerAdapter:
Code:
public class ViewPagerAdapter extends FragmentPagerAdapter {
private Context mContext;
public ViewPagerAdapter(FragmentManager manager, Context context) {
super(manager);
mContext = context;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Fragment0();
case 1:
return new Fragment1();
case 2:
return new Fragment2();
case 3:
return new Fragment3();
case 4:
return new Fragment4();
}
return null;
}
@Override
public int getCount() {
return 5;
}
}
If more code is needed, please let me know. Thanks for your help.
Info
SuperThomasLab said:
I have an Activity that contains a Fragment with a ViewPager. Then I call a method of a Fragment within the ViewPager. But if that Fragment then calls getParentFragment(), it returns null.
Why is getParentFragment() null?
The main Fragment that contains a ViewPager:
Code:
public class MyFragment extends Fragment {
private TabLayout mTabLayout;
private ViewPager mViewPager;
private ViewPagerAdapter mAdapter;
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
View view = getView();
// Setup the ViewPager
mViewPager = (ViewPager) view.findViewById(R.id.container);
setupViewPager(mViewPager);
// Setup the TabLayout
mTabLayout = (TabLayout) view.findViewById(R.id.tabs);
mTabLayout.setupWithViewPager(mViewPager);
}
// This method is called from Activity
public void callNestedFragment() {
if (isDetached()) {
return;
}
((Fragment0) mViewPager.getItem(0)).testMethod();
}
}
The nested Fragment (inside mViewPager):
Code:
public class Fragment0 extends Fragment {
...
public void testMethod() {
if (isDetached()) {
return;
}
// Why is getParentFragment() null?
Log.i(TAG, "Parent fragment:" + getParentFragment());
return;
}
}
The ViewPagerAdapter:
Code:
public class ViewPagerAdapter extends FragmentPagerAdapter {
private Context mContext;
public ViewPagerAdapter(FragmentManager manager, Context context) {
super(manager);
mContext = context;
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Fragment0();
case 1:
return new Fragment1();
case 2:
return new Fragment2();
case 3:
return new Fragment3();
case 4:
return new Fragment4();
}
return null;
}
@Override
public int getCount() {
return 5;
}
}
If more code is needed, please let me know. Thanks for your help.
Click to expand...
Click to collapse
Post Full Logcat Error & Fragment Class
:good:
I found the answer. If isDetached() is true, it doesn't mean getParentFragment() is not null.
So instead of the previous check in testMethod(), this is the new code:
Code:
public void testMethod() {
if (isDetached() && getParentFragment() != null) {
return;
}
...
}
I also now call the same method again in the onStart() method within Fragment0, where getParentFragment() should not be null.