Database Users

A question about list

Hi.
I am building an app that has a list. All of the clicks on list items result in one activity, like XActivity. XActivity contains a text view. I want that when I click on ListItem1 the text view shows a string forexample string1, then onClickListItem2 it shows string2, onListItemClicX it shows stringX. If it's confusing let me know.
How can I handle it ?
Thanks in advance.

torpedo mohammadi said:
Hi.
I am building an app that has a list. All of the clicks on list items result in one activity, like XActivity. XActivity contains a text view. I want that when I click on ListItem1 the text view shows a string forexample string1, then onClickListItem2 it shows string2, onListItemClicX it shows stringX. If it's confusing let me know.
How can I handle it ?
Thanks in advance.
Click to expand...
Click to collapse
I'm assuming you're using an ArrayAdapter - it would be helpful if you posted some code.
You have to setup an OnItemClickListener for your ListView. In the OnItemClick method, you will have to get the data from the adapter using the position that was clicked. Then create an intent to ActivityX and pass the clicked data.
Code:
[B]ArrayAdapter adapter = new ArrayAdapter();[/B]
listView.setClickable(true);
//Setup the on item click listener for the listview
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Create an intent pointing to XActivity
Intent intent = new Intent(this, XActivity.class);
//Add the clicked string as an extra
intent.putExtra("KEY_CLICKEDSTRING", adapter.getItem(position - 1));
//Start the activity
this.startActivity(intent);
}
});
In ActivityX, simply retrieve the data and set it in the textview:
Code:
@Override
public void onCreate(Bundle savedInstanceState) {
... Activity setup code
TextView textView = findViewById(R.id.yourtextview);
//Get the intent data
String strClicked = getIntent().getStringExtra("KEY_CLICKEDSTRING");
textView.setText(strClicked);
}

Thank you.
But I don't know what value does the "int position" give me ? Forexample does it give the value of "1" or .... ?
I want to know that in order to know which item was clicked and now what to do .
Can anybody help me ?
Thanks in advance.

Like previously mentioned. Post your code and we can help you out better.

not complex, First I make a new ArrayAdapter<string> add adapt it to my listView. Up to know no problem. But in the continue :
// usual codes to answer a click onItemClick(AdapterView<?> av, View v, int position, long id) {
//create a intent as Alkonic said
//My problem }
...
@My problem I want to use a set of codes and understand which item was clicked. I have 41 items and my idea is this :
// getting the text of the clicked item String title = ((TextView)v).getText().toString();
If (title=getString(R.string.theTextIHadAddedToArrayAdapterForItem1)) {
// so item 1 was clicked
//Change the text of thesecond TextView in the second activity ( wich I wrote intent for)
// rewrite the if order 41 times for 41 items
...
But this doesn't work. Can anybody help me ?
@Alconic :
I don't understand the method you wrote for retrieving intent data ( I mean
//Get the intent data String strClicked = getIntent().getStringExtra("KEY_CLICKEDSTRING");
) because the "Key_CLICKEDSTRING" is always constant and one thing. How can I cange it for 41 items ?
Thank you guys anyway.

not complex, First I make a new ArrayAdapter<string> add adapt it to my listView. Up to know no problem. But in the continue :
// usual codes to answer a click onItemClick(AdapterView<?> av, View v, int position, long id) {
//create a intent as Alkonic said
//My problem }
...
@My problem I want to use a set of codes and understand which item was clicked. I have 41 items and my idea is this :
// getting the text of the clicked item String title = ((TextView)v).getText().toString();
If (title=getString(R.string.theTextIHadAddedToArrayAdapterForItem1)) {
// so item 1 was clicked
//Change the text of thesecond TextView in the second activity ( wich I wrote intent for)
// rewrite the if order 41 times for 41 items
...
But this doesn't work. Can anybody help me ?
@Alconic :
I don't understand the method you wrote for retrieving intent data ( I mean
//Get the intent data String strClicked = getIntent().getStringExtra("KEY_CLICKEDSTRING");
) because the "Key_CLICKEDSTRING" is always constant and one thing. How can I cange it for 41 items ?
Thank you guys anyway.

You should post your onItemClick routine. But for going at it blind on our side this is what I would do:
Code:
public void onItemClick(AdapterView<?> av, View v, int pos, long id) {
//Get text from a textview that is on your listview
TextView textView2 = (TextView) v.findViewById(R.id.myTextView);
String txtMytext = textView2.getText().toString();
//Create an intent pointing to XActivity
Intent intent = new Intent(this, XActivity.class);
//Add the clicked string as an extra
intent.putExtra("KEY_CLICKEDSTRING", txtMytext);
//Start the activity
this.startActivity(intent);
}
Without your code, I don't understand what you are comparing with the if statement you posted. Use this along with @Alkonic 's code should get you in the right direction. If it doesn't, we need more code to help better.

torpedo mohammadi said:
not complex, First I make a new ArrayAdapter<string> add adapt it to my listView. Up to know no problem. But in the continue :
// usual codes to answer a click onItemClick(AdapterView<?> av, View v, int position, long id) {
//create a intent as Alkonic said
//My problem }
...
@My problem I want to use a set of codes and understand which item was clicked. I have 41 items and my idea is this :
// getting the text of the clicked item String title = ((TextView)v).getText().toString();
If (title=getString(R.string.theTextIHadAddedToArrayAdapterForItem1)) {
// so item 1 was clicked
//Change the text of thesecond TextView in the second activity ( wich I wrote intent for)
// rewrite the if order 41 times for 41 items
...
But this doesn't work. Can anybody help me ?
@Alconic :
I don't understand the method you wrote for retrieving intent data ( I mean
//Get the intent data String strClicked = getIntent().getStringExtra("KEY_CLICKEDSTRING");
) because the "Key_CLICKEDSTRING" is always constant and one thing. How can I cange it for 41 items ?
Thank you guys anyway.
Click to expand...
Click to collapse
Handling Clicks:
The int position refers to the position of the item that was clicked in the arrayadapter.
Instead of this:
Code:
String title = ((TextView)v).getText().toString();
you can use
Code:
String title = adapter.getItem(position);
That code will take the clicked position and get the clicked string from the adapter.
Intent Data
When you send data with an intent, it has two parts: the Name and Value.
The following code sets the name to a constant "Key_CLICKEDSTRING" and the Value is variable, depending on what was clicked.
Code:
intent.putExtra("KEY_CLICKEDSTRING", adapter.getItem(position));
When you want to access the VALUE, you have to provide the constant name:
Code:
String strClicked = getIntent().getStringExtra("KEY_CLICKEDSTRING");
Hope that helped!

[Q] Issues with adding objects to a photo taken by the user

I've been trying to learn to program for Android lately by simply coming up with ideas and implementing them. It started out easy enough with pulling information from an online RSS feed and showing this in a nice environment. But the current idea has me stumped.
I'd like the following to happen:
Take a picture using intent
Entire picture is shown in a new activity
Zoom in on a certain spot
Add predefined items to the picture
Press next which connects the items from left to right
Add some more items
Press next to connect the new items
Zoom out
Save the image
First taking a picture, this wasn't too hard using the camera intent:
Code:
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
I can then extract the absolute path from fileUri with the following line:
Code:
String path = new File(fileUri.getPath()).getAbsolutePath();
This path can be put in a bundle which can be put in an intent which is then used to start the activity that should show the image.
Code:
public class TestActivity extends Activity implements SurfaceHolder.Callback {
private static final String TAG = TestActivity.class.getSimpleName();
private String path = "";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SurfaceView view = new SurfaceView(this);
setContentView(view);
Intent intent = getIntent();
Bundle bundle = intent.getExtras();
path = bundle.getString("path");
view.getHolder().addCallback(this);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
Canvas canvas = holder.lockCanvas();
if (canvas == null) {
Log.d(TAG,"Can't draw because canvas is null");
}
else {
Bitmap bitmap = BitmapFactory.decodeFile(path);
Paint paint = new Paint();
if(bitmap == null) {
Log.d(TAG,"Can't draw because bitmap is null");
}
else {
canvas.drawBitmap(bitmap,0,0,paint);
}
holder.unlockCanvasAndPost(canvas);
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int frmt, int w, int h) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
}
The first issue here is that it of course doesn't show the entire photo. Not that surprising considering it's larger than the view. Ideally I'd like to zoom out to show the entire photograph. Once I've zoomed one way I'd assume that zooming in on the part that you want should also be possible.
Next is adding the objects. My idea was simply catching any touch events and adding a new object once the finger is released. This way I'd end up with a list of items with each having a draw function which can be called through the surfaceview when it is redrawn.
Connecting these items could simply be done by creating a line object and going through the list of all items and using their locations for the begin and endpoints of the lines
One of the big issues here is that the x and y locations would be relative to the screen, not to the photo. Which would mean that when you zoom back out the entire background would change but the actual items would remain at the same spot and in the same size.
I've been searching and searching for any tutorial or other question about the same issue, but either I've had no luck or I've been using the wrong keywords. And for all I know everything I have up till now could be wrong.
If anyone could give some pointers, or maybe knows a guide or tutorial somewhere or some better keywords I could use for searching I'd really appreciate it.

Xylon- said:
One of the big issues here is that the x and y locations would be relative to the screen, not to the photo. Which would mean that when you zoom back out the entire background would change but the actual items would remain at the same spot and in the same size.
Click to expand...
Click to collapse
would you just not need to either control or track the sample/scale if the image so that you know the 1st pixel displayed (top left) and the scale factor, then the eventX/Y can be processed to be relative to what you want ?

[Q] How to prevent constant executing of asynctask

Basicly I have very same code as described here http://www.learn2crack.com/2013/12/android-swipe-view-tab-layout-example.html:
In each of the fragments I have different asynctask, that just fetches data from website. Fragment class looks like this :
Code:
TextView text;
String content;
View today;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
today = inflater.inflate(R.layout.today, container, false);
text = (TextView) today.findViewById(R.id.textView);
// ((TextView) today.findViewById(R.id.textView)).setText("Today");
new RetriveSiteData().execute("http://menza.lupajz.eu/?den=dnes");
content = (String) text.getText();
return today;
<here is the asynctask, too long >
}
I am wondering if the data is always fetched, while swiping through fragments if the TabPagerAdapter class (on the website) has this method implemented the same way
Code:
@Override
public Fragment getItem(int i) {
switch (i) {
case 0:
//Fragement for Android Tab
return new Android();
case 1:
//Fragment for Ios Tab
return new Ios();
case 2:
//Fragment for Windows Tab
return new Windows();
}
return null;
}
In case if the data is always fetched and the asynctask is always executed how can I prevent that ? Maybe adding some onResume() methods to each fragment ?
What is the best solution just to make connection to website, fetch data once and then just keep displaying them while I am swiping between fragments ?

lupajz said:
Basicly I have very same code as described here http://www.learn2crack.com/2013/12/android-swipe-view-tab-layout-example.html:
In each of the fragments I have different asynctask, that just fetches data from website. Fragment class looks like this :
Code:
TextView text;
String content;
View today;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
today = inflater.inflate(R.layout.today, container, false);
text = (TextView) today.findViewById(R.id.textView);
// ((TextView) today.findViewById(R.id.textView)).setText("Today");
new RetriveSiteData().execute("http://menza.lupajz.eu/?den=dnes");
content = (String) text.getText();
return today;
}
I am wondering if the data is always fetched, while swiping through fragments if the TabPagerAdapter class (on the website) has this method implemented the same way
Code:
@Override
public Fragment getItem(int i) {
switch (i) {
case 0:
//Fragement for Android Tab
return new Android();
case 1:
//Fragment for Ios Tab
return new Ios();
case 2:
//Fragment for Windows Tab
return new Windows();
}
return null;
}
In case if the data is always fetched and the asynctask is always executed how can I prevent that ? Maybe adding some onResume() methods to each fragment ?
What is the best solution just to make connection to website, fetch data once and then just keep displaying them while I am swiping between fragments ?
Click to expand...
Click to collapse
Yes, that data is always fetched since onCreateView is always called when a Fragment which hasn't been in layout appears, whether it was already instantiated or not. Have a look at the diagram on the right here for better understanding on how the specific methods are called. The dumb solution would be to put that code into the constructor, but Google suggests not doing anything there and instead using onCreate, which is also only called once.
Instead it might be better to just fire up the tasks for each Fragment (maybe sequentially as well) in the Activity, but that depends on how much data you are loading here, since the user might be switched to the page you are loading at the very end.

Thanks for answear yea I was looking at the fragment google site and I guessed that was the problem, but I am not getting the second part.
Instead it might be better to just fire up the tasks for each Fragment (maybe sequentially as well) in the Activity, but that depends on how much data you are loading here, since the user might be switched to the page you are loading at the very end.
Click to expand...
Click to collapse
I am just getting about 30+ lines of pure text, so it is not that big.

lupajz said:
Thanks for answear yea I was looking at the fragment google site and I guessed that was the problem, but I am not getting the second part.
I am just getting about 30+ lines of pure text, so it is not that big.
Click to expand...
Click to collapse
What I meant was that if you need to load much data over a possibly slow connection and do it in a specific order (meaning start with one category, then when that's finished the next one and so on) it might be that the user is swiping to the last category that will load and has to wait untill all other have been loaded. This is what speaks against loading everything in the activity and then reloading the Fragments with their specific content, but of course this is not the case with just a few lines of text . That would be the the way I would do it (load everything in the onCreate() of the activity and pass it to the Fragments) if there is little to medium data to load since you don't have to open an internet connection everytime the user swipes thus swiping will be much smoother (or it won't show a ProgressBar like that stupid xda-app ).
If it is data that you don't need to reload more than once every day, you can think about cashing it as well!

ListView in Fragment not displaying

Hello, I am hoping someone can point out anything I might be doing wrong that is causing my issue. (seems hard to find "best practice" type of advise for newer android features)
My problem is that a ListView which is inside a fragment, controlled by a ViewPager does not get displayed on the screen if I swipe to the next fragment. (but a TextView inside the same fragment shows up fine on all fragment instances),
To set the scene, I have only one fragment class out of which I instantiate all the fragments used by the ViewPager.
Inside the fragments onActivityCreated I create a cursor loader and a custom cursor adapter and on the loaders onLoadFinished I swap the cursor as its supposed to be. Naturally the customCursorAdapter that I created handles the inflation of the listView row in the newView method and binds the data from the cursor in the bindView method.
Does this sound right? I mean I did it this way with the intent of not having tight coupling, having the fragment be independent. So why won't it draw out the listview for subsequent pages? From what I have seen in the logs, all methods get called for all fragments, including getItem, newView, bindView etc.
Final quirk is that the "previous" fragmet's listView does get drawn. Meaning I start on Fragment 1 - listView is there. Move to fragment 2 - listview not there, move to fragment 3 list view not there, move back to fragment 2 list view IS there now, and back to fragment 1 it is NOT there anymore.
I don't have time to post code right now but will as soon as I get a chance.
Thank you all.
Code:
//main activity which creates the view pager and adapter and starts the process
protected void onCreate(Bundle savedInstanceState) {
Log.d(TAG,"onCreate begin");
super.onCreate(savedInstanceState);
setContentView(R.layout.pager_task_tracking);
viewPager = (ViewPager) findViewById(R.id.pager);
FragmentManager fragmentManager = getSupportFragmentManager();
MyPagerAdapter myPagerAdapter = new MyPagerAdapter(fragmentManager);
viewPager.setOffscreenPageLimit(0); // trying to force drawing of fragments
viewPager.setAdapter(myPagerAdapter);
Log.d(TAG,"onCreate viewPager done");
//MyPagerAdapter getItem (extends FregmentSatePagerAdapter
public Fragment getItem(int i) {
Log.d(TAG,"getItem called with item:"+i);
return TaskListFragment.newInstance(i);
}
//fragment onActivityCreated , this fragment instanciated in getView of viewPager
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.d(TAG, "onActivityCreated with datePointer:"+datePointer);
TextView textViewFragmentTitle = (TextView) getView().findViewById(R.id.fragmentTitle);
textViewFragmentTitle.setText("DATE:"+datePointer);
loaderManager = getLoaderManager();
list = (ListView) getActivity().findViewById(R.id.TaskListView);
customAdapter = new CustomCursorAdapter(getActivity(), null, 1 , datePointer);
list.setAdapter(customAdapter);
loaderID = datePointer; //attempt to get fragment listview to draw - not working
loaderManager.initLoader(loaderID, null, this);
}
///cursor loader onFinish
public void onLoadFinished(android.support.v4.content.Loader<Cursor> loader,
Cursor newCursor) {
Log.d(TAG, "onLoadFinished:"+datePointer);
if (customAdapter != null && newCursor != null ){
Log.d(TAG, "onLoadFinished swapCursor:"+datePointer);
customAdapter.swapCursor(newCursor);
//doesnt help customAdapter.notifyDataSetChanged();
} else {
Log.v(TAG,"OnLoadFinished: mAdapter is null");
}
}
//MyCustomCursorAdapter (used by the listview inside the fragment above)
public View newView(Context context, Cursor cursor, ViewGroup parent) {
LayoutInflater inflater = LayoutInflater.from(context);
View retView = inflater.inflate(R.layout.task_list_item_layout, null);
RelativeLayout.LayoutParams relativeLayoutParameters;
Log.d(TAG,"newView layout inflated:"+datePointer);
return retView;
}
///bindView of same MyCustomCursorAdapter
public void bindView(View view, Context context, Cursor cursor) {
Log.d(TAG,"bindView:"+datePointer);
TextView tvName = (TextView) view.findViewById(R.id.textviewItemName);
tvName.setText(cursor.getString(cursor.getColumnIndex(DBHelper.C_TASK_NAME))+" ["+datePointer+"]");
}
Also check out the LogCat logs with description of the action in the name corresponding to the log statements in the code above.
I noticed more detail about what happens (if you look at the logcat you will see also)
When the screen is displayed the first fragment has the listview present, but the fragment has the id/datePointer (same thing) of "0" BUT the listview items have an id/datePointer of "1"
If you look at the initial logcat you will see "newView layout inflated:1" but no "newView layout inflated:0" how this is being skipped I have no idea. And how the id's can be mix-matched between fragment instances baffles me.
And lastly, after scrolling right twice (to the 0,1, 2nd fragment) it did not have the listview as reported, but scrolling BACK ONE the listview shows up in the 1st fragment ... but even more baffling with lisvtView items that report being part of the "0" fragment .... whaaaat?

Why are you using a listview inside fragment when you have listfragment available?

EatHeat said:
Why are you using a listview inside fragment when you have listfragment available?
Click to expand...
Click to collapse
EatHeat, I am doing this for the sake of flexibility for adding additional controls/views to the fragment besides just a list view (Example I envision adding several buttons to the bottom of the fragment/screen which will be "outside" the listview.
Does it make more sense what I am doing now? That is exactly one of the questions I have, its so hard to find advise on what makes more sense when it comes to these complex combinations of viewPager+fragments+custom listViews+loaders
So my current flow is:
1--Activity (creates ViewPager with myPagerAdapter)
2----ViewPager in itst getItem method instantiates a fragment from class TaskListFragment
3-------The fragment in it's onActivityCreated instantiates a CustomCursorAdapter (with null cursor) and initializes a loader
4-------The loader swaps the cursor in it's onLoadFinished (and this is supposed to populate the listview)
Items 2-4 repeat for every "swipe" or every fragment instantiated.
-The listView control XML is defined in an XML file which is used by the fragment's setContentView
-The lisView row layout XML is defined in a separate XML file inflated by the customCursorAdapter's newView method.
SOLVED: (after literally one week of headache and rewriting the code in every way I know)
the fragments onCreateView I had it getting the listview with getActivity() .. but I should have done it with getView()
the solution was replacing this line
Code:
list = (ListView) getActivity().findViewById(R.id.TaskListView);
with this line
Code:
list = (ListView) getView().findViewById(R.id.TaskListView);
That was it!!! all the headache!!
I don't particularly understand what getView does as opposed to getActivity .. but right now I am pleased it works.

Hi Can u please provide me the code .. I an working on same thing .. bt my getView Function is not called ..
Email : [email protected]

Make sure you custom pager adapter returns all pages as per count.

Use recyclerview in fragments
Sent from my Lenovo A6000 using Tapatalk

The offscreen page limit is by default 1. It is useless to set the limit lesser equals as 1.
Code:
viewPager.setOffscreenPageLimit(0);

[Q] How do I open a new fragment from a list fragment?

I browsed around and haven't quite found a similar solution. I am fairly new to android dev and working with a few things for educational purposes. I've read up on fragments and activities but couldn't quite get it to work how I am trying to.
I have my list fragment, the list items are defined in the strings.xml as an array.
List Fragment (Con_70s.java):
Code:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View v = inflater.inflate(R.layout.fragment_main, container, false);
String[] items = getResources().getStringArray(R.array.con_70);
setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items));
return v;
}
The Strings (strings.xml):
Code:
<string-array name="con_70">
<item>Item 1</item>
<item>Item 2</item>
<item>Item 3</item>
</string-array>
On the fragment I have an onListItemClick that currently tells me which position on the list I clicked (Con_70s.java):
Code:
@Override
public void onListItemClick(ListView l, View v, int position, long id){
Toast.makeText(getActivity(), "You selected " + position, Toast.LENGTH_LONG).show();
}
How would I modify this OnListItemClick to open a new fragment (or activity)? Let's say it would be called "New Activity".

startActivity(new Intent(this, NewActivity.class));
I guess you would like to send the position of the clicked item to the new activity. I suggest to use shared prefs
--------------------
Phone: Nexus 4
OS: rooted Lollipop LRX21T
Bootloader: unlocked
stock Recovery

Masrepus said:
startActivity(new Intent(this, NewActivity.class));
I guess you would like to send the position of the clicked item to the new activity. I suggest to use shared prefs
--------------------
Phone: Nexus 4
OS: rooted Lollipop LRX21T
Bootloader: unlocked
stock Recovery
Click to expand...
Click to collapse
Or you could just use setArguaments(); to put the information in a Bundle then use getArguaments(); from the new activity to retrieve it? Same with fragments.

how does it know which item I picked to associate with each fragment? by using position?
can you give an example?

nevermind, thats declared with
Code:
onListItemClick(ListView l, View v, int position, long id){