Develop Reference

startActivity() inside setOnClickListener not doing anything

I have a button inside a view that checks some constraints, and then starts another activity, however the startActivity() call does not do anything, the new activity's onCreate() never gets called, and the code then continues past it. I have checked using logging and breakpoints, and the conditions are being met and startActivity() is being called. Both activities are defined in the application manifest.
From the source activity's onCreate():
int[] winning_player;
int next_player;
int[] scores;
[...]
final Button end_turn_button = (Button) findViewById(R.id.end_turn);
end_turn_button.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
if (winning_player[0] == next_player) {
Intent intent = new Intent(getApplicationContext(), FinalScreenActivity.class);
intent.putExtra("SCORES", scores);
startActivity(intent);
}
}
});
FinalScreenActivity.java
public class FinalScreenActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_final_screen);
Intent intent = getIntent();
final int[] scores = intent.getIntArrayExtra("SCORES");
// put the scoreboard in ascending order
Arrays.sort(scores);
// find the scoreboard in the view
TableLayout scoreboard = (TableLayout) findViewById(R.id.scoreboard);
// get the string resources to be formatted
Resources res = getResources();
String player_name_format = res.getString(R.string.player);
// Set the scoreboard in the view
Log.d("brains.PlayActivity", "onCreate: Creating scoreboard");
// for each player entry in the scoreboard
for (int i = 0; i < scores.length; i++) {
Log.d("brains.PlayActivity", "onCreate: adding scoreboard entry "+String.valueOf(i));
// create 2 TextViews
TextView player_name = new TextView(FinalScreenActivity.this);
TextView player_score = new TextView(FinalScreenActivity.this);
// Set the size of the TextViews
player_name.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT));
// set the first one to the player's name string resource
player_name.setText(String.format(player_name_format, i + 1));
// set the second one to the player's score resource, which takes the score twice (once for the number itself, and once to work out which plural is needed)
player_score.setText(res.getQuantityString(R.plurals.brains, scores[i], scores[i]));
// Create a TableRow to put the score into
TableRow scoreboard_entry = new TableRow(FinalScreenActivity.this);
// Set the size of the TableRow
scoreboard_entry.setLayoutParams(new TableRow.LayoutParams(TableLayout.LayoutParams.MATCH_PARENT, TableLayout.LayoutParams.WRAP_CONTENT));
// Add the TextViews to the TableRow
scoreboard_entry.addView(player_name);
scoreboard_entry.addView(player_score);
// Add the TableRow to the TableLayout
scoreboard.addView(scoreboard_entry);
}
// Get the title text
TextView title_text = (TextView) findViewById(R.id.title_text);
title_text.setText(res.getQuantityString(R.plurals.win_brains, scores[scores.length - 1], scores.length - 1, scores[scores.length - 1]));
// set the play again button
Button play_again_button = (Button) findViewById(R.id.play_again_button);
play_again_button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getBaseContext(), SelectPlayersActivity.class);
startActivity(intent);
}
});
}
}
and activity_final_screen.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="uk.co.bluesapphiremedia.android.zombiedice.FinalScreenActivity"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="#+id/title_text"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:id="#+id/scoreboard"
android:layout_below="#+id/title_text" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/play_again"
android:id="#+id/play_again_button"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true" />
</RelativeLayout>

end_turn_button.setOnClickListener(this);
//override onClick() method in activity implement interface View.OnClickListner
public void onClick(View v) {
if(v.getId() == R.id.end_turn){
if (winning_player[0] == next_player) {
Intent intent = new Intent(this,FinalScreenActivity.class);
intent.putExtra("SCORES", scores);
startActivity(intent);
}
}
}

Use two buttons (positive/negative) or one and change text?

I'm curious about how other people solve this problem:
When having an application which allows users to subscribe to each other, should you better use two buttons, one with a "Subscribe" text and the other with a "Unsubscribe" text or just use one button in the layout and change the text after clicking the button?
2 buttons solution
XML:
<Button
android:id="#+id/subscribe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Subscribe"
android:visibility="gone" />
<Button
android:id="#+id/unsubscribe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Unsubscribe"
android:visibility="gone" />
Java:
// update subscribe buttons
if (userProfile.getID() != user.getUserID()) {
if (userProfile.hasSubscribed()) {
unsubscribeView.setVisibility(View.VISIBLE);
}
else {
subscribeView.setVisibility(View.VISIBLE);
}
}
subscribeView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
subscribe = 1;
subscribe();
}
});
unsubscribeView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
subscribe = -1;
subscribe();
}
});
1 button solution
XML:
<Button
android:id="#+id/subscribe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
Java:
// update subscribe buttons
if (userProfile.getID() != user.getUserID()) {
if (userProfile.hasSubscribed()) {
subscribeView.setText("Unsubscribe");
}
else {
subscribeView.setText("Subscribe");
}
}
subscribeView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if (userProfile.hasSubscribed()) {
subscribe = -1;
}
else {
subscribe = 1;
}
subscribe();
}
});

Use the one-button approach.
Try to keep the UI as clean as possible, and avoid having buttons that are visible, but don't have any effect.

One activitiy with different backgrounds in android

I am trying to create an android app. I have two buttons next and back in my android app. I want when i click on next button its open same activity with different background. Next time i again click next new background image. And on press on back button its show previous image. And if no previous image its shows menu on press. Similarly if background with last image its hide next button. I have no idea how to do this.
I have tried this:
#Override
public void onCreate(Bundle savedInstanceState)
{
onCreate(savedInstanceState);
back = (Button) findViewById(R.id.back);
next = (Button) findViewById(R.id.next);
back.setOnClickListener(this);
next.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if(v.getId()==R.id.back)
{
startActivty(new Intent(this,));
}
else if(v.getId()==R.id.next)
{
startActivity(newIntent(this,));
}
}
Xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/back">
<Button
android:id="#+id/back"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="25dp"
android:background="#drawable/ques"
android:text="Back" />
<Button
android:id="#+id/next"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/back2"
android:layout_alignBottom="#+id/back2"
android:layout_alignParentRight="true"
android:background="#drawable/ques"
android:text="Next" />
</RelativeLayout>
In layout as you can see i am using image back for background. I want when i click next new background image then next and so on.
But i dont know how to start same activity with differene backgroud.

Don't start new Activity just change the background:
Keep an array of background resources in your activity like:
int[] backgroundResId;
and one int variable to store current background index:
int currentIndex=0;
now inside your onCreate initialize this array with resource id's of all the backgrounds drawables:
backgroundResId=new int[]{R.drawable.a,R.drawable.b,R.drawable.c};
changeBackground()
create function changeBackground in activity:
private void changeBackground(){
findViewById(R.id.root_layout).setBackgroundResource(backgroundResId[currentIndex]);
}
Now onClick of next button increase currentIndex:
currentIndex++;
if(current<=backgroundResId.length){
changeBackground();
}else{
// setVisibility of next button to invisible
}
onBackButton Click
currentIndex--;
if(current>=0){
changeBackground();
//// setVisibility of next button to visible
}else{
//show menu
}

Make an images array and post your data to the next activity:
Intent intent = getIntent();
intent.putExtra("background", imageIdInTheImageArray);
startActivity(intent);
//finish();
and in your onCreate function :
Bundle b = getIntent().getExtras();
if (b != null) {
int background = b.getInt("background");
//set your background
}

You can add an ImageView in your xml file.
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
you can change background using this
ImageView imageView = (ImageView) findViewById(R.id.imageView);
imageView.setBackgroundResource(resId);

Try this..
Global:
int[] backgrounds = new int[]{ images in drawable as int array };
int count = 0;
Button back,next;
RelativeLayout img_backn_lay;
JAVA:
setContentView(R.layout.activity_main);
back = (Button) findViewById(R.id.back);
next = (Button) findViewById(R.id.next);
back.setOnClickListener(this);
next.setOnClickListener(this);
img_backn_lay = (RelativeLayout) findViewById(R.id.main_lay);
img_backn_lay.setBackgroundResource(backgrounds[count]);
count += 1;
ClickListener:
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v.getId()==R.id.next)
{
if(backgrounds.length != count){
img_backn_lay.setBackgroundResource(backgrounds[count]);
count += 1;
}else{
Toast.makeText(MainActivity.this, "No images", Toast.LENGTH_LONG).show();
}
}
else if(v.getId()==R.id.back)
{
if(count != 0){
img_backn_lay.setBackgroundResource(backgrounds[count]);
count -= 1;
}else{
Toast.makeText(MainActivity.this, "No images", Toast.LENGTH_LONG).show();
}
}
}
XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/main_lay"
android:layout_width="match_parent"
android:layout_height="match_parent" >

android - some views are not "visible" after activity restart

Hello Android developers,
i'm facing a strange behaviour of some views after activity restart - there are some views, which are not "visible", but they are layouted and react on Touch actions.
I'm trying to keep the application follow Android lifetime guide. I drop the Activity to background and let system to close my activity. Then I navigate back to my activity, which is recreated. There is no problem with data to be corrupted (saved in db with every change made), but the views are. There are some properly shown, but everything inside TableView, which is inside ScrollView, is not visible. If I call getVisibility() on any of not shown views, i get that it is visible. As I mentioned above, views are not "visible", but react on Touch and scroll events, like they were properly shown.
This is also hard (impossible) to debug, cause when the app is closed, debbuger is disconnected. But anyway, recreation follows the same methods callback - onCreate(), onStart(), onResume(), so once created, why there's problem other time? The only difference to me is that there is a null Bundle in onCreate(Bundle) when Activity is newly created and not null when it is recreated by system. If the activity is only stopped (in background) but not closed by system, everything works fine.
I also tryed to override onSaveInstanceState() and onRestoreInstanceState() with nothing to be saved and restored (no call to super implementation), but it had no effect.
I'm using Android 4.1.1 and emulator 2.1.
Does anyone have any idea?
Thanks Ales
Here are (links to) screenshots to figure it out better:
Before activity is closed by system
After activity is recreated
Here are the layout files:
<!-- Header -->
<LinearLayout
android:id="#+id/startlistHeaderLayout" xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView android:id="#+id/textStartlistName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:lines="1"
android:gravity="left"
android:text=""
/>
<TextView android:id="#+id/textStarttime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:lines="1"
android:gravity="right"
android:text=""
android:layout_weight="1"
/>
</LinearLayout>
<!-- Results -->
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#id/resultsScrollView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:saveEnabled="false"
>
<TableLayout
android:id="#id/timingLapTableLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="2"
android:shrinkColumns="2"
android:saveEnabled="false"
>
<!-- rows are added in code -->
</TableLayout>
</ScrollView>
</LinearLayout>
<!-- R.layout.timing_row -->
<TableRow xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#id/timingTableRow"
android:saveEnabled="false"
>
<TextView
android:id="#id/textTimingPosition"
android:text=""
android:gravity="right"
android:paddingLeft="4dip"
android:saveEnabled="false"
/>
<TextView
android:id="#id/textTimingBib"
android:text=""
android:gravity="right"
android:paddingLeft="1dip"
android:saveEnabled="false"
/>
<TextView
android:id="#id/textTimingName"
android:text=""
android:lines="1"
android:ellipsize="end"
android:gravity="left"
android:paddingLeft="1dip"
android:paddingRight="5dip"
android:saveEnabled="false"
/>
<TextView
android:id="#id/textTimingBehind1"
android:text=""
android:gravity="right"
android:paddingRight="5dip"
android:saveEnabled="false"
/>
<TextView
android:id="#id/textTimingBehind2"
android:text=""
android:gravity="right"
android:paddingRight="5dip"
android:saveEnabled="false"
/>
</TableRow>
Here is part of Activity code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(null);
loadPreferencesTimingTheme();
if (ownTheme) {
this.setTheme(theme);
} else {
this.setTheme(MainActivity.theme);
}
}
protected void onStart() {
super.onStart();
View lapView;
View v;
int sid;
setContentView(R.layout.startlist_edit);
sid = getIntent().getIntExtra(TimingActivity.STARTLIST_ID, -1);
if (sid == -1) {
Toast.makeText(this, "Sorry, could not load startlist.", Toast.LENGTH_LONG);
this.finish();
return;
}
tdb = new TimingDB(this);
sl = tdb.getStartlist(sid); // get Startlist from db into memory
// hide unnecessary columns
v = findViewById(R.id.timingLapTableLayout);
((TableLayout) v).setColumnCollapsed(0, true);
loadStartlist(sl); // inflate rows with startlist data and set listeners
// load the preferences and set preferences listener
loadPreferences();
PreferenceManager.getDefaultSharedPreferences(this).registerOnSharedPreferenceChangeListener(prefsChangeListener);
}
public void onStop() {
super.onStop();
PreferenceManager.getDefaultSharedPreferences(this).unregisterOnSharedPreferenceChangeListener(prefsChangeListener);
if (tdb != null) tdb.close();
}
protected void onSaveInstanceState (Bundle outState) {
// super.onSaveInstanceState(outState);
}
protected void onRestoreInstanceState (Bundle savedInstanceState) {
// super.onRestoreInstanceState(savedInstanceState);
}
protected void onDestroy() {
super.onDestroy();
if (tdb != null) tdb.close();
}
private void loadStartlist(StartList sl) {
// set startlist name & time
View v = findViewById(R.id.textStarttime);
((TextView) v).setText(SimpleDateFormats.ddmmyyyyhhmmss.format(new Date(sl.getStartTime())));
v = findViewById(R.id.textStartlistName);
((TextView) v).setText(sl.getName());
// set header onclicklistener
v = findViewById(R.id.startlistHeaderLayout);
v.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// show dialog to change startlist name and time
Bundle args = new Bundle();
args.putString(KEY_NAME, ((TextView) findViewById(R.id.textStartlistName)).getText().toString());
args.putString(KEY_STTIME, ((TextView) v.findViewById(R.id.textStarttime)).getText().toString());
if (Build.VERSION.SDK_INT < 8) {
dialogBundle = args;
showDialog(DIALOG_EDIT_STARTLIST);
} else {
showDialog(DIALOG_EDIT_STARTLIST, args);
}
}
});
// add competitors to startlist
int cnt = sl.getCompetitorsCount();
for (int i = 0; i < cnt; i++) {
Competitor c = sl.getCompetitorByIndex(i);
appendStartlistRow(c);
}
}
public void appendStartlistRow(final Competitor c) {
TableRow inflatedView = (TableRow) getLayoutInflater().inflate(R.layout.timing_row, null);
inflatedView.setTag(TAG_COMPETITOR, c);
inflatedView.setTag(new Integer(c.getBib()));
inflatedView.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
TableLayout tl = (TableLayout) findViewById(R.id.timingLapTableLayout);
Bundle args = new Bundle();
args.putInt(KEY_INDEX, tl.indexOfChild(v));
if (Build.VERSION.SDK_INT < 8) {
dialogBundle = args;
showDialog(DIALOG_EDIT_COMPETITOR);
} else {
showDialog(DIALOG_EDIT_COMPETITOR, args);
}
}
});
// set up texts
TextView text = (TextView) inflatedView.findViewById(R.id.textTimingBib);
text.setText(c.getBib() + "");
text = (TextView) inflatedView.findViewById(R.id.textTimingName);
text.setText(c.getName());
text = (TextView) inflatedView.findViewById(R.id.textTimingBehind1);
text.setText(getFormatedStartTime(sl, c, Settings.STARTTIME_ABSOLUTE));
text = (TextView) inflatedView.findViewById(R.id.textTimingBehind2);
text.setText(getFormatedStartTime(sl, c, Settings.STARTTIME_RELATIVE));
// append the row
appendStartlistRow((ViewGroup) inflatedView);
}
public void appendStartlistRow(ViewGroup row) {
// set background and text colors
if (((((Integer) row.getTag()).intValue()) % 2) == Defs.VIEW_EVEN) {
row.setBackgroundColor(Defs.COLOR_BACKGROUND_EVEN);
for (int j = 0; j < row.getChildCount(); j++) {
((TextView) (row.getChildAt(j))).setTextColor(Defs.COLOR_TEXT_EVEN);
}
} else {
row.setBackgroundColor(Defs.COLOR_BACKGROUND_ODD);
for (int j = 0; j < row.getChildCount(); j++) {
((TextView) (row.getChildAt(j))).setTextColor(Defs.COLOR_TEXT_ODD);
}
}
((TableLayout) findViewById(R.id.timingLapTableLayout)).addView(row);
}
Defs.java:
public class Defs {
protected static final int VIEW_EVEN = 0;
protected static final int VIEW_ODD = 1;
protected static int COLOR_BACKGROUND_EVEN;
protected static int COLOR_BACKGROUND_ODD;
protected static int COLOR_BACKGROUND_SELECTED;
protected static int COLOR_BACKGROUND_SPYED;
protected static int COLOR_TEXT_ODD;
protected static int COLOR_TEXT_EVEN;
protected static int COLOR_TEXT_SELECTED;
protected static int COLOR_TEXT_SPYED;
private static boolean isInitialized = false;
protected static void init(Context c) {
if (isInitialized) return;
COLOR_BACKGROUND_EVEN = c.getResources().getColor(R.color.background_darker);
COLOR_BACKGROUND_ODD = c.getResources().getColor(R.color.background_lighter);
COLOR_BACKGROUND_SELECTED = c.getResources().getColor(R.color.background_selected);
COLOR_BACKGROUND_SPYED = c.getResources().getColor(R.color.background_spyed);
COLOR_TEXT_ODD = c.getResources().getColor(R.color.text_lighter);
COLOR_TEXT_EVEN = c.getResources().getColor(R.color.text_darker);
COLOR_TEXT_SELECTED = c.getResources().getColor(R.color.text_selected);
COLOR_TEXT_SPYED = c.getResources().getColor(R.color.text_spyed);
isInitialized = true;
}
}

Without any code it's next to impossible to say much about the problem itself. But I did want to say (would fit better as a comment but can't do it yet) that for a long list (like yours seems to be based on the screenshots) using an actual ListView with a custom ArrayAdapter might be a better solution. ListView re-uses views when scrolled thus reducing unnecessary view creation. Also, once you learn how to use the ListView, you'll probably find it easier than adding table rows manually. If those aren't familiar to you, check a tutorial here:
http://www.vogella.com/articles/AndroidListView/article.html
And if you decide to change from tables to a ListView, maybe the problem (whatever it is) disappears as well. You never know. :)

How to scroll a HorizontalScrollView on button click in android?

I have horizontal scrollview in my android app with Next and Previous buttons.I want to show the these buttons only when the scollview needs scrolling.ie,width of scrollview content exceeds display width.Also want to hide previous and Next buttons when reaching first and last items respectively.How to to next/previous items when click on these buttons?
main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ffffff" >
<Button
android:id="#+id/btnPrevoius"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:text="Previous"
android:visibility="gone" />
<HorizontalScrollView
android:id="#+id/horizontalScrollView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:layout_toLeftOf="#+id/btnNext"
android:layout_toRightOf="#+id/btnPrevoius"
android:fillViewport="true" >
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
</LinearLayout>
</HorizontalScrollView>
<Button
android:id="#+id/btnNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Next"
android:visibility="gone" />
</RelativeLayout>
activity
public class SampleActivity extends Activity {
private static LinearLayout linearLayout;
private static HorizontalScrollView horizontalScrollView;
private static Button btnPrevious;
private static Button btnNext;
private static int displayWidth = 0;
private static int arrowWidth = 0;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
horizontalScrollView = (HorizontalScrollView) findViewById(R.id.horizontalScrollView1);
linearLayout = (LinearLayout) findViewById(R.id.linearLayout1);
btnPrevious = (Button) findViewById(R.id.btnPrevoius);
btnNext = (Button) findViewById(R.id.btnNext);
for (int i = 0; i < 15; i++) {
Button button = new Button(this);
button.setTag(i);
button.setText("---");
linearLayout.addView(button);
}
ViewTreeObserver vto = linearLayout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
ViewTreeObserver obs = linearLayout.getViewTreeObserver();
obs.removeGlobalOnLayoutListener(this);
Display display = getWindowManager().getDefaultDisplay();
displayWidth = display.getWidth();
if (linearLayout.getMeasuredWidth() > (displayWidth - 40)) {
btnPrevious.setVisibility(View.VISIBLE);
btnNext.setVisibility(View.VISIBLE);
}
}
});
btnPrevious.setOnClickListener(listnerLeftArrowButton);
horizontalScrollView.setOnTouchListener(listenerScrollViewTouch);
}
private OnTouchListener listenerScrollViewTouch = new OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
showHideViews();
return false;
}
};
private OnClickListener listnerLeftArrowButton = new OnClickListener() {
#Override
public void onClick(View v) {
horizontalScrollView.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, new KeyEvent(0, 0));
}
};
public static void showHideViews() {
int maxScrollX = horizontalScrollView.getChildAt(0).getMeasuredWidth()- displayWidth;
Log.e("TestProjectActivity", "scroll X = " +horizontalScrollView.getScrollX() );
Log.i("TestProjectActivity", "scroll Width = " +horizontalScrollView.getMeasuredWidth() );
Log.d("TestProjectActivity", "Max scroll X = " + maxScrollX);
if (horizontalScrollView.getScrollX() == 0) {
hideLeftArrow();
} else {
showLeftArrow();
}
if (horizontalScrollView.getScrollX() == maxScrollX) {
showRightArrow();
} else {
//hideRightArrow();
}
}
private static void hideLeftArrow() {
btnPrevious.setVisibility(View.GONE);
}
private static void showLeftArrow() {
btnPrevious.setVisibility(View.VISIBLE);
}
private static void hideRightArrow() {
btnNext.setVisibility(View.GONE);
}
private static void showRightArrow() {
btnNext.setVisibility(View.VISIBLE);
}
}
The 'maxScrollX' value is not correct for me.How to find maximum scrollvalue for this?
Thanks in Advance

This might come a bit late, but for anyone out there that will face this problem I suggest alternative solution(s).
First, use different component than HorizontalScrollView. Here are the options:
OPTION 1: Horizontal ListView - add this class to your project (create a separate package, something like com.yourproject.widgets). Also you'll need to create custom Adapter, see how that's done in this example. I suggest you create separate adapter class (exp. HorizontalListViewAdapter) and put it in already created com.yourproject.widgets package.
add this widget to your layout in the xml (put it between buttons that need to mimic the scrolling behavior) you'll need to add something like:
<com.yourproject.widgets.HorizontalListView
android:id="#+id/hList"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
reference this (along with the buttons) in the Activity/Fragment that utilizes the widget
HorizontalListView mHList = (HorizontalListView) findViewById (R.id.hList);
Button bPrevoius = (Button) findViewById (R.id.btnPrevoius);
Button bNext = (Button) findViewById (R.id.btnNext);
add onClickListeners to the Buttons. Use the scrollTo() function predefined in the HorizontalListView widget. As you can see in the code, it takes int dp value to scroll. Add positive values if you want to scroll in right (next), and use negative values if you want to scroll in left (previous):
bPrevoius.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//value 500 is arbitrarily given. if you want to achieve
//element-by-element scroll you should get the width of the
//previous element dynamically or if the elements of the
//list have uniform width just put that value instead
mHList.scrollTo(-500);
//if it's the first/last element you can bPrevoius.setEnabled(false)
}
});
bNext.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
mHList.scrollTo(500);
}
});
OPTION 2: More up to date solution to this issue can be the new widget RecyclerView introduced in Android L (addition of android:scrollbars="vertical" seems that would do the trick; other than that should have conventional ListView behavior). For more info check the official documentation.

devu
Plz have a look at the following links
1) http://android-er.blogspot.in/2012/07/implement-gallery-like.html
2) http://androiddreamers.blogspot.in/2012/09/horizontal-scroll-view-example.html
3)http://code.google.com/p/mobyfactory-uiwidgets-android/
Let me know if u r facing any issues
Thanks

In titanium appcelerator, you can do this using scrollableView
var scrollableView = Ti.UI.createScrollableView({
showPagingControl:true,
scrollingEnabled: true,
top: 360
});
Then, you can run a loop of all images or any content that you have, and add them to this view.
for(loop) {
eval("var view"+i+"=Ti.UI.createView();");
profile_image = Ti.UI.createImageView({
image: result[0]['profile_image'],
left:15,
width:82,
height:104,
top: 0
});
eval("view"+i+".add(profile_image);");
eval("scrollableView.addView(view"+i+");");
}
mywin.add(scrollableView);