Just like new google guidelines I want to hide actionbar on listview scroll.
I have succeeded in implementing the same but if I scroll slowly the actionbar flickers. How can provide smooth animation on its show and hide.
This is my code
lv.setOnScrollListener(new OnScrollListener() {
private int mLast;
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub
if (mLast < firstVisibleItem) {
if (getSupportActionBar().isShowing()) {
getSupportActionBar().hide();
}
}
if (mLast > firstVisibleItem) {
if (!getSupportActionBar().isShowing()) {
getSupportActionBar().show();
}
}
mLast = firstVisibleItem;
}
});
I have even tried putting these value for listview
android:clipToPadding="false"
But it just doesn't seem to work.
Related
I want to create Single and Double click on Button in Android...
Thanks for help in Advance.
I have already tried using button.setOnClickListener() for single click on button but i couldn't find double click on button
Try this code : (btn is the button you want to check for single and double click)
int i = 0;
btn.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
i++;
Handler handler = new Handler();
Runnable r = new Runnable() {
#Override
public void run() {
i = 0;
}
};
if (i == 1) {
//Single click
handler.postDelayed(r, 250);
} else if (i == 2) {
//Double click
i = 0;
ShowDailog();
}
}
});
I want to hide the title bar when i scrolling the items in the ListView and i want to show the title bar after scrolling. Suggest any ideas to solve this issue.
First add the Xml View into ActionBar like this:
LayoutInflater inflater = (LayoutInflater) getActionBar()
.getThemedContext().getSystemService(LAYOUT_INFLATER_SERVICE);
View customActionBarView = inflater.inflate(R.layout.main, null);
final ActionBar actionBar = getActionBar();
actionBar.setDisplayOptions(
ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_SHOW_HOME);
actionBar.setCustomView(customActionBarView,
new ActionBar.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
setContentView(R.layout.main);
Then do the changes in onScrollStateChanged() method:
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case SCROLL_STATE_IDLE:
actionBar.show();
break;
case SCROLL_STATE_TOUCH_SCROLL:
actionBar.hide();
break;
}
}
//declare this two globally
public static int ch = 0, cht = 1;
int myLastVisiblePos;
//Then add onScrollListener to your ListView
list.setOnScrollListener(new OnScrollListener() {
#Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
int currentFirstVisPos = view.getFirstVisiblePosition();
if (currentFirstVisPos > myLastVisiblePos) {
if (ch == 1) {
ch++;
cht = 1;
getActionBar().hide();
} else if (ch == 0) {
getActionBar().show();
ch++;
}
}
if (currentFirstVisPos < myLastVisiblePos)
if (cht == 1)
getActionBar().show();
myLastVisiblePos = currentFirstVisPos;
}
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
});
This solution worked for me very good:
// mLastFirstVisibleItem defined globally
quranTextList.setOnScrollListener(new AbsListView.OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
/**
* Hide actionbar when scroll down
*/
if (mLastFirstVisibleItem < firstVisibleItem)
if (getSupportActionBar().isShowing())
getSupportActionBar().hide();
if (mLastFirstVisibleItem > firstVisibleItem)
if (!getSupportActionBar().isShowing())
getSupportActionBar().show();
mLastFirstVisibleItem = firstVisibleItem;
}
});
Source: Android ActionBar hide/show when scrolling list view
I've been reading about ViewHolder Pattern and it's effects on ListView scrolling performance lately.
For a smooth scrolling, fast ListView should i avoid using OnClickListener registerations inside adapter getView() method such as:
#Override
public View getView(final int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if (convertView == null)
{
holder = new ViewHolder();
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(mResourceId, null);
holder.btn1 = (TextView) convertView.findViewById(R.id.btn1);
holder.img1 = (TextView) convertView.findViewById(R.id.img1);
convertView.setTag(holder);
} else { holder = (ViewHolder) convertView.getTag(); }
final Items item = getItem(position);
holder.btn1.setText(item.btnText);
holder.img1.setBackgroundResource(item.imgSource);
holder.img1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) { /* .. my code block USING POSITION ARG .. */ }
}
holder.btn1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) { /* .. My Code Block USING POSITION ARG .. */ }
}
return convertView;
}
If so, is registering a OnItemClickListener to ListView instance as following sample does a good practice:
myListView.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long id) {
if (view.getId() == R.id.btn1)
{
// my code block USING POSITION ARG
}
else if (view.getId() == R.id.img1)
{
// my code block USING POSITION ARG
}
}
});
It's better to use a Wrapper to access to your View and to define your OnClickListener earlier (and outside the adapter for a better usability).
The following sample show how to handle 2 clickable View on one single item of the ListView with good performance:
public class ItemAdapter extends BaseAdapter {
private List<Item> items;
private ItemWrapper wrapper = null;
private OnClickListener onMyItemClickListener1;
private OnClickListener onMyItemClickListener2;
public ItemAdapter(Context context, List<Item> items, OnClickListener onMyItemClickListener1, OnClickListener onMyItemClickListener2) {
this.inflater = LayoutInflater.from(context);
this.items = items;
this.onMyItemClickListener1 = onMyItemClickListener1;
this.onMyItemClickListener2 = onMyItemClickListener2;
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public synchronized View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
if (row == null) {
row = inflater.inflate( R.layout.item, null);
wrapper = new ItemWrapper(row);
row.setTag(wrapper);
} else {
wrapper = (ItemWrapper)row.getTag();
}
Item item = getItem(position);
wrapper.getClickView1().setOnClickListener(onMyItemClickListener1);
wrapper.getClickView2().setOnClickListener(onMyItemClickListener2);
return(row);
}
}
public class ItemWrapper {
private View baseView;
private View clickView1;
private View clickView2;
public ItemWrapper(View baseView) {
this.baseView = baseView;
}
public View getClickView1() {
if ( clickView1 == null) {
clickView1 = (View)baseView.findViewById(R.id.clickView1);
}
return(clickView1);
}
public View getClickView2() {
if ( clickView2 == null) {
clickView2 = (View)baseView.findViewById(R.id.clickView2);
}
return(clickView2);
}
}
I am programatically showing the soft keyboard when a layout is loaded on a button click.
I am showing the softkeyboard only when the textfield has focus. It works fine. But when I call the same method at another place in the code(not a button click) then the soft keyboard does not show up. Below is my code. Please point out where I went wrong.
public void showNewView() {
setContentView(R.layout.activity_main);
this.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
isRegisterScreen = true;
final EditText text1 = (EditText) findViewById(R.id.label1);
final EditText text2 = (EditText) findViewById(R.id.label2);
final InputMethodManager inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
text1.setOnFocusChangeListener(new View.OnFocusChangeListener() {
#Override
public void onFocusChange(View view, boolean hasFocus) {
if(hasFocus){
inputManager.showSoftInput(labelText, InputMethodManager.SHOW_IMPLICIT);
}else{
inputManager.hideSoftInputFromWindow(text1.getWindowToken(), 0);
}
}
});
text2.setOnFocusChangeListener(new View.OnFocusChangeListener() {
#Override
public void onFocusChange(View view, boolean hasFocus) {
if(hasFocus){
inputManager.showSoftInput(text2, InputMethodManager.SHOW_IMPLICIT);
}else{
inputManager.hideSoftInputFromWindow(phoneText.getWindowToken(), 0);
}
}
});
text1.requestFocus();
}
I am developing a GWT application that render a text on a canvas. I want to resize the canvas whenever browser window resized. The problem is if I used Window.addResizeHandler, the rendering process with each resize will be very slow. So I need a way to resize the canvas only when the user release the mouse button after finishing resize. Is there anyway to do that?
You could add a delay, so that the resize is only processed after the window hasn't been resized for some number of milliseconds:
Window.addResizeHandler(new ResizeHandler() {
Timer resizeTimer = new Timer() {
#Override
public void run() {
doComplexLayoutCalculations();
}
};
#Override
public void onResize(ResizeEvent event) {
resizeTimer.cancel();
resizeTimer.schedule(250);
}
});
Window.addResizeHandler(new ResizeHandler() {
#Override
public void onResize(ResizeEvent event) {
Scheduler.get().scheduleDeferred(
new Scheduler.ScheduledCommand() {
public void execute() {
// layout stuff
}
});
}
});