Develop Reference

Android ListView items onClick with CursorAdapter only working after some clicks

This is the ListFragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_list, container, false);
listList = (ListView) root.findViewById(R.id.list_list);
mListAdapter = new ListCursorAdapter(getActivity(),null);
FloatingActionButton addFab = (FloatingActionButton) root.findViewById(R.id.fabAdd);
addFab.setFocusable(false);
addFab.setFocusableInTouchMode(false);
mDBAdapter = new DBAdapter(getContext());
mDBAdapter.open();
id = new ArrayList<Integer>();
nombres = new ArrayList<String>();
latitudes = new ArrayList<Double>();
longitudes = new ArrayList<Double>();
descripciones = new ArrayList<String>();
categorias = new ArrayList<Integer>();
listList.setAdapter(mListAdapter);
empty = (TextView) root.findViewById(R.id.tvEmpty);
Cursor listas = mDBAdapter.getListaListas();
if(listas==null || listas.getCount()<=0) empty.setVisibility(View.VISIBLE);
listList.setClickable(true);
AdapterView.OnItemClickListener myListViewClicked = new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
cur = mDBAdapter.getListaListas();
int id_lis;
String name_lis;
if (cur.moveToFirst()) {
for (int k=0;k<i;k++){
cur.moveToNext();
}
}
id_lis = cur.getInt(0);
name_lis = cur.getString(1);
Intent intent = new Intent(getContext(), MarkerListActivity.class);
intent.putExtra("numLista", id_lis);
Log.i("id_lista", ""+ id_lis);
intent.putExtra("nameLista", name_lis);
startActivity(intent);
}
};
listList.setOnItemClickListener( myListViewClicked );
listList.setLongClickable(true);
It has also a long click event that displays some options. At first, I put the Intent in there, but this is the common way to do it.
The adapter it's a normal CursorAdapter with only a textview in it.
These are the XML files:
list_item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/click"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false">
<TextView
android:id="#+id/list_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="2dip"
android:paddingTop="6dip"
android:textColor="#color/colorPrimaryDark"
android:textSize="20sp"
android:textStyle="bold"
android:layout_marginLeft="#dimen/activity_horizontal_margin"
android:longClickable="true"
android:clickable="false"
android:focusableInTouchMode="false"
android:focusable="false"/>
<View xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="8dp"
android:background="#B6B6B6"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:focusable="false"
android:focusableInTouchMode="false"
android:clickable="false"
/>
</LinearLayout>
</LinearLayout>
And this is the fragment_list layout:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".ListFragment"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false"
android:descendantFocusability="blocksDescendants">
<ListView
android:id="#+id/list_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#null"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false" />
<TextView
android:id="#+id/tvEmpty"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="5dp"
android:hint="Ninguna lista para mostrar"
android:textSize="25sp"
android:textStyle="bold"
android:visibility="invisible"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false"/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabAdd"
android:clickable="false"
android:focusable="false"
android:focusableInTouchMode="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="12dp"
android:tint="#android:color/white"
app:fabSize="normal"
app:srcCompat="#drawable/ic_action_add" />
</FrameLayout>
So, how can I do to get the onItemClick working with a simple click? It always takes four or more clicks to open the new Activity.
Thank you so much.

Your onItemClicked method does database operations on the UI thread. This is something you should avoid and it causes bad user experience. Wrap your code inside an AsyncTask and execute it like the following:
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Log.d("onItemClick", "clicked Item")
AsyncTask task = new AsyncTask<Void, Void, Void>() {
private int id_lis;
private String name_lis;
protected Long doInBackground(Void... voids) {
cur = mDBAdapter.getListaListas();
if (cur.moveToFirst()) {
for (int k=0;k<i;k++){
cur.moveToNext();
}
}
id_lis = cur.getInt(0);
name_lis = cur.getString(1);
}
protected void onPostExecute(Long result) {
Intent intent = new Intent(getContext(), MarkerListActivity.class);
intent.putExtra("numLista", id_lis);
Log.i("id_lista", ""+ id_lis);
intent.putExtra("nameLista", name_lis);
startActivity(intent);
}
}.execute();
}

Why I am getting NullPointerException on ImageView?

My code is as follows:
activity_for_me.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:id="#+id/recco_list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
</ListView>
<ImageView
android:id="#+id/checkin"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="20dp"
android:onClick="ClickCheckIn"
android:src="#drawable/checkin" />
</RelativeLayout>
recco_list.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#layout/nine_patch" >
<ImageView
android:id="#+id/outlet_icon"
android:layout_marginLeft="15dp"
android:layout_height="55dp"
android:layout_width="55dp"
android:layout_marginTop="10dp"/>
<TextView
android:id="#+id/distance"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_marginLeft="15dp"
android:hint="Distance"
/>
<TextView
android:id="#+id/outlet_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/outlet_icon"
android:layout_toLeftOf="#id/distance"
android:layout_marginLeft = "15dip"
android:hint="outlet"
/>
<TextView
android:id="#+id/reward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/outlet_name"
android:layout_toRightOf="#id/outlet_icon"
android:layout_toLeftOf="#id/distance"
android:layout_marginLeft = "15dip"
android:layout_marginTop="5dp"
android:textColor="#color/abc_search_url_text_holo"
android:hint="Reward"
/>
<View
android:id="#+id/rule"
android:layout_below="#id/reward"
android:layout_toRightOf="#id/outlet_icon"
android:layout_toLeftOf="#id/distance"
android:layout_width="fill_parent"
android:layout_marginLeft = "15dip"
android:layout_height="1dp"
android:background="#c0c0c0"/>
<ImageView
android:id="#+id/favourite_icon"
android:layout_below="#id/rule"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:layout_height="15dp"
android:layout_width="15dp"
android:src="#drawable/heart_empty"/>
<ImageView
android:id="#+id/loc_icon"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_below="#id/rule"
android:layout_marginLeft = "15dip"
android:layout_marginTop="5dp"
android:layout_toRightOf="#id/outlet_icon"
android:src="#drawable/map_pointer"/>
<TextView
android:id="#+id/locality"
android:layout_toRightOf="#id/loc_icon"
android:layout_toLeftOf="#id/distance"
android:layout_below="#id/rule"
android:layout_marginRight="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft = "5dip"
android:layout_marginTop="5dp"
android:hint="Locality"
/>
</RelativeLayout>
Activity.java
public class ForMeActivity extends Fragment {
#SuppressLint("ClickableViewAccessibility")
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RelativeLayout rootView = (RelativeLayout) inflater.inflate(
R.layout.activity_for_me, container, false);
ImageView favourite_heart = (ImageView) rootView
.findViewById(R.id.favourite_icon);
favourite_heart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// Toast.makeText(YourActivityName.this,
// "The favorite list would appear on clicking this icon",
// Toast.LENGTH_LONG).show();
System.out.println("Favourite Icon clicked");
}
});
list = (ListView) rootView.findViewById(R.id.recco_list);
ImageView check_in_img = (ImageView) rootView
.findViewById(R.id.checkin);
ImageView outlet_logo = (ImageView) rootView
.findViewById(R.id.outlet_icon);
final String data = getArguments().getString("data");
ForMeFile = new File(getActivity().getExternalFilesDir(filepath),
filename);
final String cookie = getArguments().getString("cookie");
System.out.print(cookie);
check_in_img.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent in = new Intent(getActivity(), CheckInView.class);
startActivity(in);
System.out.println("Checkin Icon clicked");
}
});
}
I want to change image for favourite_icon ImageView when I click on it. But as soon as I click on the icon I get NullPointerException. What is the reason that click of check_in_img is working but click of favourite_icon is not working even though the current layout is the one which contains favourite_icon? Other sources of SO says to check the same.

favourite_icon is a part of recco_list.xml and you are trying to find it in activity_for_me.xml. The view does not exist there and hence, the exception.
R.id.favourite_icon is not there in activity_for_me.xml.
And if you want to access the items in the listview, I suggest you read about ListView and getView().

Trying to programatically create multiple relative layouts within a ViewFlipper

I am trying to programatically create a multiple RelativeLayouts inside a ViewFlipper.
I'm doing this in order to build a dynamic ViewFlipper that holds N number of images, N changes.
I am trying to create something like that: (that works BTW..)
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ViewFlipper
android:id="#+id/view_flipper"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#drawable/lightning" />
<TextView
style="#style/ImageTitle"
android:text="#string/lightning" />
</RelativeLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#drawable/color_baloons" />
<TextView
style="#style/ImageTitle"
android:text="#string/color_baloons" />
</RelativeLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#drawable/natural_wall" />
<TextView
style="#style/ImageTitle"
android:text="#string/natural_wall" />
</RelativeLayout>
</ViewFlipper>
<ImageView
android:id="#+id/swipe_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:src="#drawable/swipe_left" />
<ImageView
android:id="#+id/swipe_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:src="#drawable/swipe_right" />
</RelativeLayout>
This is my code:
Problem: I don't see the images
What am I missing?
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.single_image_layout);
_context = this;
_viewFlipper = (ViewFlipper) this.findViewById(R.id.view_flipper);
Intent intent = getIntent();
_imageUrls = intent.getStringArrayExtra("theImageUrl");
for (int i = 0; i < _imageUrls.length; i++) {
RelativeLayout layout = new RelativeLayout(_context);
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
layout.setLayoutParams(layoutParams);
ImageView imageView = new ImageView(_context);
LayoutParams imageParams = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
imageView.setLayoutParams(imageParams);
imageView.setAdjustViewBounds(true);
imageView.setScaleType(ScaleType.CENTER_CROP);
File file = new File(_imageUrls[i]);
Uri uri = Uri.fromFile(file);
final String imagePathFromUri = uri.getPath();
final Bitmap bitmap = BitmapHelper.loadImageFromUrl(
"file://" + _imageUrls[i],
imagePathFromUri,
BUFFER_IO_SIZE);
if (bitmap != null) {
final Drawable drawable = new BitmapDrawable(
getResources(),
bitmap);
if (drawable != null) {
imageView.setBackgroundDrawable(drawable);
}
}
TextView textView = new TextView(_context);
textView.setTextAppearance(_context, R.style.ImageTitle);
layout.addView(imageView);
layout.addView(textView);
_viewFlipper.addView(layout);
}
_viewFlipper.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
}
});
}

How to create a Button in the camera view in vuforia?

I am using Vuforia AR sdk and want to create a button on the camera preview on the screen.
I cannot figure out where and how to add the button.

I have edit the camera_overlay_udt.xml like this.. In my layout design i have placed back button and listview.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/camera_overlay_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="#+id/headerLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="#drawable/header"
android:orientation="horizontal" >
<ImageButton
android:id="#+id/backButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:background="#android:color/transparent"
android:src="#drawable/back" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Swipart"
android:textColor="#color/white"
android:textSize="18dp"
android:textStyle="bold" />
<ImageButton
android:id="#+id/arcstarButton"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_centerInParent="true"
android:layout_marginRight="10dp"
android:background="#android:color/transparent"
android:src="#drawable/star_button" />
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="#+id/favListingLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/headerLayout"
android:gravity="top"
android:orientation="horizontal"
android:visibility="visible" >
<ListView
android:id="#+id/favlist"
android:layout_width="120dp"
android:layout_height="match_parent"
android:layout_marginBottom="50dp"
android:layout_marginLeft="7dp"
android:cacheColorHint="#00000000" />
</LinearLayout>
<LinearLayout
android:id="#+id/bottom_bar"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:background="#color/overlay_bottom_bar_background"
android:gravity="center_vertical"
android:orientation="horizontal"
android:visibility="visible"
android:weightSum="1" >
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:background="#color/overlay_bottom_bar_separators" />
<ImageButton
android:id="#+id/camera_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#null"
android:contentDescription="#string/content_desc_camera_button"
android:onClick="onCameraClick"
android:paddingBottom="10dp"
android:paddingTop="10dp"
android:src="#drawable/camera_button_background" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_above="#id/bottom_bar"
android:background="#color/overlay_bottom_bar_separators" />
</RelativeLayout>
after that please Edit that ImageTargets.java class
private void addOverlayView(boolean initLayout) {
// Inflates the Overlay Layout to be displayed above the Camera View
LayoutInflater inflater = LayoutInflater.from(this);
mUILayouts = (RelativeLayout) inflater.inflate(
R.layout.camera_overlay_udt, null, false);
mUILayouts.setVisibility(View.VISIBLE);
// If this is the first time that the application runs then the
// uiLayout background is set to BLACK color, will be set to
// transparent once the SDK is initialized and camera ready to draw
if (initLayout) {
mUILayouts.setBackgroundColor(Color.TRANSPARENT);
}
// Adds the inflated layout to the view
addContentView(mUILayouts, new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
// Gets a reference to the bottom navigation bar
mBottomBar = mUILayouts.findViewById(R.id.bottom_bar);
// Gets a reference to the Camera button
mCameraButton = mUILayouts.findViewById(R.id.camera_button);
mCameraButton.setVisibility(View.GONE);
favButton = (ImageButton) mUILayouts.findViewById(R.id.arcstarButton);
listview = (ListView) mUILayouts.findViewById(R.id.favlist);
backButton = (ImageButton) mUILayouts.findViewById(R.id.backButton);
backButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View paramView) {
// TODO Auto-generated method stub
finish();
}
});
listview.setVisibility(View.GONE);
galleryList = SendFile.getFavourites();
if (galleryList != null) {
gridviewAdapter = new GridviewAdapter(ImageTargets.this);
listview.setAdapter(gridviewAdapter);
}
favButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
if (galleryList != null && galleryList.size() > 0) {
if (listview.getVisibility() == View.GONE) {
listview.setVisibility(View.VISIBLE);
} else {
listview.setVisibility(View.GONE);
}
} else {
Toast.makeText(ImageTargets.this, "Favourites not fond",
Toast.LENGTH_LONG).show();
}
}
});
listview.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> paramAdapterView,
View paramView, int positon, long paramLong) {
SendFile.setFavourite(galleryList.get(positon));
Intent intent = new Intent(ImageTargets.this,
LoadingScreen.class);
Bundle bundle = new Bundle();
bundle.putInt("x", x_Axis);
bundle.putInt("y", y_Axis);
intent.putExtras(bundle);
startActivity(intent);
finish();
}
});
showDialogHandler = new Handler() {
public void handleMessage(Message msg) {
String aResponse = msg.getData().getString("message");
if ((null != aResponse)) {
// ALERT MESSAGE
Toast.makeText(getBaseContext(),
"Server Response: " + aResponse, Toast.LENGTH_SHORT)
.show();
showAlertDialog(aResponse);
} else {
// ALERT MESSAGE
Toast.makeText(getBaseContext(),
"Not Got Response From Server.", Toast.LENGTH_SHORT)
.show();
}
};
};
loadingDialogHandler.captureButtonContainer = mUILayouts
.findViewById(R.id.camera_button);
mUILayouts.bringToFront();
}
They showing there layouts using handlers

Start you camera preview in a normal way. Place a layout on top of it with transparent background like this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:background="#ff000000"
android:layout_height="match_parent">
<ImageView
android:id="#+id/start_image_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="5dp"
android:scaleType="fitXY"
android:layout_weight="1"
android:src="#drawable/scan_image"/>
</RelativeLayout>
In java file, you can add this layout like this:
private View mStartupView;
mStartupView = getLayoutInflater().inflate(
R.layout.startup_screen, null);
// Add it to the content view:
addContentView(mStartupView, new LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
This way you will get to see your button on top of camera preview. Hope it helps

You can add buttons in cameraoverlay layout which is in layout folder and you can initialize buttons in initAR function which is in mainactivity.

Step 1: Add the button in the camera_overlay.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/camera_overlay_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ProgressBar
style="#android:style/Widget.ProgressBar"
android:id="#+id/loading_indicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="18dp"
android:layout_marginTop="51dp"
android:text="Button" />
</RelativeLayout>
Step 2: Edit the ImageTargets.java class
private static final String LOGTAG = "ImageTargets";
private Button b1;
Step 3: Modify the initApplicationAR() function of ImageTargets.java class
private void initApplicationAR()
{
// Create OpenGL ES view:
int depthSize = 16;
int stencilSize = 0;
boolean translucent = Vuforia.requiresAlpha();
mGlView = new SampleApplicationGLView(this);
mGlView.init(translucent, depthSize, stencilSize);
mRenderer = new ImageTargetRenderer(this, vuforiaAppSession);
mRenderer.setTextures(mTextures);
mGlView.setRenderer(mRenderer);
b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
b1.setVisibility(View.GONE);
}
});
}
Now lay back and watch your button disappear on a click!

Although it's a long time since the post.. yet I found one article.. wherein you can have the desired thing..
Ref: https://medium.com/nosort/adding-views-on-top-of-unityplayer-in-unityplayeractivity-e76240799c82
Solution:
Step1: Make a custom layout XML file (vuforia_widget_screen.xml). For example, button has been added.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/main_layout">
<FrameLayout
android:id="#+id/unity_player_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<Button
android:id="#+id/back_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:background="#null"
android:text="#string/welcome" />
</FrameLayout>
Step 2: Make following changes in the UnityPlayerActivity.java
Replace "setContentView(mUnityPlayer);" with
setContentView(R.layout.vuforia_widget_screen);
FrameLayout frameLayout = findViewById(R.id.unity_player_layout);
frameLayout.addView(mUnityPlayer.getView());
-> For anyone, who will face the issue in future. :)

Why the item selected return nothing when it was called?

I'm trying to create a Request Responses activity and get the itemSelected for use of next activity which is store them into user friendlist. But the itemSelected return nothing when the "Accept" button is clicked.(It should display itemSelected in toast dialog) Anyone knows what happen it is? Additionally, I like to ask why the item in the listView was located at the not accurate location? it seems like more upper that usual, for the second item.How to adjust it properly?
The figure below is layout of NotificationView.java:
NotificationView.java
public class NotificationView extends ListActivity{
String[] people;
ListView lv;
Button btn1,btn2;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.view);
NotificationManager mnotis =(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
mnotis.cancel(getIntent().getExtras().getInt("notificationID"));
String i = getIntent().getExtras().getString("name");
people = i.split("[,]");
Log.d("how",i);
lv= (ListView) findViewById(android.R.id.list);
btn1 = (Button)findViewById(R.id.acceptbtn);
btn2 = (Button)findViewById(R.id.closebtn);
ArrayAdapter<String> list = new ArrayAdapter<String>(NotificationView.this,R.layout.friendlist_item, R.id.friend_name,people);
lv.setAdapter(list);
btn1.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
lv = getListView();
int i = lv.getCount();
Log.d("count",String.valueOf(i));
runOnUiThread(new Runnable(){
public void run(){
String itemSelected = "Selected items: \n";
for(int i=0;i<lv.getCount();i++){
if(lv.isItemChecked(i)){
itemSelected += lv.getItemAtPosition(i) + "\n";
}
}
Toast.makeText(NotificationView.this,itemSelected,Toast.LENGTH_SHORT).show();
}
});
}
});
}}
view.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
>
<ListView android:id="#android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1">
</ListView>
<FrameLayout android:id="#+id/FrameLayout01"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
android:orientation="horizontal" >
<Button
android:id="#+id/acceptbtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_weight="0.46"
android:text="Accept" />
<Button
android:id="#+id/closebtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.49"
android:text="Close" />
</LinearLayout>
</FrameLayout>
friendlist_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<CheckBox android:id="#+id/friend_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingRight = "88dip"
android:textSize="20dip"
android:textStyle="bold"/>
</LinearLayout>

Your Checkbox isn't related with the method that you are calling, for listview with multiselect items follow the next guide: http://dj-android.blogspot.com/2012/04/milti-selection-listview-android-with.html