I am new to Android development and feel like this is a really trivial problem, but I cannot word it well enough to find a solution online, so I might as well ask the question here.
My goal is to create a reusable component that is essentially an expandable card like the one described here: https://material.io/design/components/cards.html#behavior.
To do it, I created a custom view that extends a CardView:
public class ExpandableCardView extends CardView {
public ExpandableCardView(Context context) {
super(context);
}
public ExpandableCardView(Context context, AttributeSet attrs) {
super(context, attrs);
// get custom attributes
TypedArray array = context.getTheme().obtainStyledAttributes(attrs, R.styleable.ExpandableCardView, 0, 0);
String heading = array.getString(R.styleable.ExpandableCardView_heading);
array.recycle();
// inflate the layout
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.expandable_card_view, this, true);
// set values
TextView headingTextView = findViewById(R.id.card_heading);
headingTextView.setText(heading.toUpperCase());
// set collapse/expand click listener
ImageView collapseExpandButton = findViewById(R.id.collapse_expand_card_button);
collapseExpandButton.setOnClickListener((View v) -> toggleCardBodyVisibility());
}
private void toggleCardBodyVisibility() {
LinearLayout description = findViewById(R.id.card_body);
ImageView imageButton = findViewById(R.id.collapse_expand_card_button);
if (description.getVisibility() == View.GONE) {
description.setVisibility(View.VISIBLE);
imageButton.setImageResource(R.drawable.ic_arrow_up);
} else {
description.setVisibility(View.GONE);
imageButton.setImageResource(R.drawable.ic_arrow_down);
}
}
}
And the layout:
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/expandable_card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="16dp"
android:animateLayoutChanges="true"
app:cardCornerRadius="4dp">
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/card_header"
android:padding="12dp"
android:layout_width="match_parent"
android:layout_height="48dp"
android:orientation="horizontal" >
<TextView
android:id="#+id/card_heading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textColor="#color/colorPrimary"
android:layout_alignParentLeft="true"
android:text="HEADING"/>
<ImageView
android:id="#+id/collapse_expand_card_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
app:srcCompat="#drawable/ic_arrow_down"/>
</RelativeLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/card_body"
android:padding="12dp"
android:layout_marginTop="28dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:visibility="gone" >
</LinearLayout>
</androidx.cardview.widget.CardView>
Ultimately I want to be able to use it like so in my activities, usually multiple instances per activity:
<xx.xyz.yy.customviews.ExpandableCardView
android:id="#+id/card_xyz"
android:layout_width="match_parent"
android:layout_height="match_parent"
custom_xxx:heading="SOME HEADING" >
<SomeView></SomeView>
</xx.xyz.yy.customviews.ExpandableCardView>
Where SomeView is any text, image, layout or another custom view altogether, typically with data bound from the activity.
How do I get it to render SomeView inside the card body? I want to take whatever child structure is defined within the custom view and show it in the card body when it is expanded. Hope I made it easy to understand.
I think that a better approach would be to define the layout that will be inserted into the CardView ("SomeView") in a separate file and reference it with a custom attribute like this:
<xx.xyz.yy.customviews.ExpandableCardView
android:id="#+id/card_xyz"
android:layout_width="match_parent"
android:layout_height="match_parent"
custom_xxx:heading="SOME HEADING"
custom_xxx:expandedView="#layout/some_view"/>
I'll explain my rationale at the end, but let's look at an answer to your question as stated.
What you are probably seeing with your code is SomeView and expandable_card_view appearing all at once in the layout. This is because SomeView is implicitly inflated with the CardView and then expandable_card_view is added through an explicit inflation. Since working with layout XML files directly is difficult, we will let the implicit inflation occur such that the custom CardView just contains SomeView.
We will then remove SomeView from the layout, stash it, and insert expandable_card_view in its place. Once this is done, SomeView will be reinserted into the LinearLayout with the id card_body. All this has to be done after the completion of the initial layout. To get control after the initial layout is complete, we will use ViewTreeObserver.OnGlobalLayoutListener. Here is the updated code. (I have removed a few things to simplify the example.)
ExpandableCardView
public class ExpandableCardView extends CardView {
public ExpandableCardView(Context context) {
super(context);
}
public ExpandableCardView(Context context, AttributeSet attrs) {
super(context, attrs);
// Get control after layout is complete.
getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
// Remove listener so it won't be called again
getViewTreeObserver().removeOnGlobalLayoutListener(this);
// Get the view we want to insert into the LinearLayut called "card_body" and
// remove it from the custom CardView.
View childView = getChildAt(0);
removeAllViews();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.expandable_card_view, ExpandableCardView.this, true);
// Insert the view into the LinearLayout.
((LinearLayout) findViewById(R.id.card_body)).addView(childView);
// And the rest of the stuff...
TextView headingTextView = findViewById(R.id.card_heading);
headingTextView.setText("THE HEADING");
// set collapse/expand click listener
ImageView collapseExpandButton = findViewById(R.id.collapse_expand_card_button);
collapseExpandButton.setOnClickListener((View v) -> toggleCardBodyVisibility());
}
});
}
private void toggleCardBodyVisibility() {
LinearLayout description = findViewById(R.id.card_body);
ImageView imageButton = findViewById(R.id.collapse_expand_card_button);
if (description.getVisibility() == View.GONE) {
description.setVisibility(View.VISIBLE);
imageButton.setImageResource(R.drawable.ic_arrow_up);
} else {
description.setVisibility(View.GONE);
imageButton.setImageResource(R.drawable.ic_arrow_down);
}
}
}
expandable_card_view.java
The CardView tag is changed to merge to avoid a CardView directly nested within a CardView.
<merge
android:id="#+id/expandable_card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="16dp"
android:animateLayoutChanges="true"
app:cardCornerRadius="4dp">
<RelativeLayout
android:id="#+id/card_header"
android:padding="12dp"
android:layout_width="match_parent"
android:layout_height="48dp"
android:orientation="horizontal" >
<TextView
android:id="#+id/card_heading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:textColor="#color/colorPrimary"
android:layout_alignParentLeft="true"
android:text="HEADING"/>
<ImageView
android:id="#+id/collapse_expand_card_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
app:srcCompat="#drawable/ic_arrow_down"/>
</RelativeLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/card_body"
android:padding="12dp"
android:layout_marginTop="28dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:visibility="gone" >
</LinearLayout>
</merge>
activity_main.xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.example.customcardview.ExpandableCardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/imageView"
android:layout_width="100dp"
android:layout_height="100dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_android" />
<TextView
android:id="#+id/childView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Say my name."
android:textSize="12sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/imageView" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.example.customcardview.ExpandableCardView>
</LinearLayout>
So, why do I suggest that you use a custom attribute to include SomeView in the layout as I identified at the beginning? In the way outlined above, SomeView will always be inflated and there is some effort to switch the layout around although SomeView may never be shown. This would be expensive if you have a lot of custom CardViews in a RecyclerView for instance. By using a custom attribute to reference an external layout, you would only need to inflate SomeView when it is being shown and the code would be a lot simpler and easier to understand. Just my two cents and it may not really matter depending upon how you intend to use the custom view.
This is my Layout , I have nested Linear layout inside another linear layout which is nested inside an Scroll view. Now i want to add an Linear layout dynamically (I may even add upto 10) inside android:id="#+id/formLayout" i.e beneth android:id="#+id/secondLayout"
Original Layout :
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="420dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true">
<!-- LinearLayout Inside ScrollView -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/formLayout"
android:orientation="vertical">
<!-- Serial Layout -->
<LinearLayout
android:id="#+id/secondLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:orientation="horizontal"
android:weightSum="2">
<android.support.design.widget.TextInputLayout
android:id="#+id/serialno_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:paddingEnd="10dp"
android:paddingLeft="10dp"
android:paddingStart="10dp">
<AutoCompleteTextView
android:id="#+id/fieldSerial"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:hint="#string/txt_sno_text"
android:singleLine="true"
android:textIsSelectable="false"
android:textSize="15sp" />
</android.support.design.widget.TextInputLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>
Dynamic Layout needs to be added :
<LinearLayout
android:id="#+id/sixthLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:orientation="horizontal"
android:weightSum="2">
<android.support.design.widget.TextInputLayout
android:id="#+id/attr2_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:paddingEnd="10dp"
android:paddingLeft="10dp"
android:paddingStart="10dp">
<EditText
android:id="#+id/fieldAttr2"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:hint="Attribute 2"
android:textSize="15sp" />
</android.support.design.widget.TextInputLayout>
</LinearLayout>
Can some one help me with this ?
Use the LayoutInflater to create a view based on your layout template, and then inject it into the view where you need it.
public static NavigableMap<Integer, String> navigableMap = new TreeMap<Integer, String>();
public static int count = 0; // to count no of views added
public static void add_new(final Activity activity)
{
final LinearLayout linearLayoutForm = (LinearLayout) activity.findViewById(R.id.formLayout);
final LinearLayout newView = (LinearLayout) activity.getLayoutInflater().inflate(R.layout.view_to_add, null);
newView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
final EditText edit_new = (EditText) newView.findViewById(R.id.fieldAttr2);
edit_new.setId(id++); // It will assign a different id to edittext each time while adding new view.
Log.i("actv id",edit_new.getId()+""); // You can check the id assigned to it here.
// use a Hashmap or navigable map (helpful if want to navigate through map)
// to store the values inserted in edittext along with its ids.
edit_new.setOnFocusChangeListener(new View.OnFocusChangeListener() {
#Override
public void onFocusChange(View view, boolean b) {
navigableMap.put(edit_new.getId(), edit_new.getText().toString());
Log.i("navigablemap", navigableMap.toString());
}
});
// you can get values directly through map by referencing its ids.
// OR
EditText actv_uc = (EditText) linearLayoutForm.findViewById(navigableMap.lastKey());
// Provide the id of edittext you want to access
actv_uc.getText(); // to get value of EditText
actv_uc.setText("");
linearLayoutForm.addView(newView);
count++;
}
Call this function whenever you want to add new view. If you are calling this in Activity, then there is no need to pass Activity object as parameter. but if you are using this in fragment, then need to pass a Parent Activity object to function.
Very easy and helpful tutorial for adding views dynamically :-
http://android-er.blogspot.in/2013/05/add-and-remove-view-dynamically.html
Hope this will help you. Thank you
Try this:
LinearLayout myRoot = (LinearLayout) findViewById(R.id.formLayout);
LayoutInflater inf = LayoutInflater.from(yourContext);
View child;
for (int i = 0; i < 10; i++) {
child = inf.inflate(R.layout.your_added_layout, null);
child.setId("textView"+i);
// can set layoutparam if needed.
myRoot.addView(child);
}
Upon clicking each TextView they should lead to another layout file to help the user learn about human trafficking. In the onCreate method I have setOnClickListener to my text view. Inflating it is an issue though. Is this called inflating a view? I've seen people recommending the use of fragments for this, using setContentView (from what I've found this shouldn't be used), and using the layout inflater while passing in the layout I want and null. However that doesn't work. How should this code look?
The XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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="com.example.piatt.worksafe.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Work Safe!"
android:textSize="36sp"
android:layout_centerHorizontal="true"
android:paddingBottom="32dp"
android:id="#+id/title"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="What is Human Trafficing?"
android:layout_below="#+id/title"
android:layout_centerHorizontal="true"
android:textSize="24sp"
android:padding="16dp"
android:id="#+id/whatIsHumanTrafficing"
android:clickable="true"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="How do I get safe labor?"
android:layout_below="#+id/whatIsHumanTrafficing"
android:layout_centerHorizontal="true"
android:textSize="24sp"
android:padding="16dp"
android:id="#+id/howDoIGetSafeLabor"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="How do I check that my job / job offer is legal?"
android:layout_below="#+id/howDoIGetSafeLabor"
android:layout_centerHorizontal="true"
android:textSize="24sp"
android:padding="16dp"
android:gravity="center"
android:id="#+id/checkLegality"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="How can I get help?"
android:layout_below="#+id/checkLegality"
android:layout_centerHorizontal="true"
android:textSize="24sp"
android:padding="16dp"
android:id="#+id/getHelp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="About us"
android:layout_below="#+id/getHelp"
android:layout_centerHorizontal="true"
android:textSize="16sp"
android:layout_alignParentBottom="true"
android:gravity="bottom"
android:id="#+id/aboutUs"
/>
</RelativeLayout>
The java class:
#Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView whatIsHumanTrafficing = (TextView) findViewById(R.id.whatIsHumanTrafficing);
whatIsHumanTrafficing.setOnClickListener(new View.OnClickListener(){
public void onClick(View view){
//What is this context, why do I need it and where does it come from?
//What is the ViewGroup, why do I need it and where does it come from?
view.inflate(Context context, R.layout.what_is_human_trafficing, ViewGroup root);
}
});
}
Aside: You could read the documentation for View.inflate
What is this context, why do I need it and where does it come from?
What: YourActivity.this (replace with your actual class name)
Why: You need it as a parameter to inflate a View.
What is the ViewGroup, why do I need it and where does it come from?
You probably don't need it; it can be null. It is the ViewGroup to inflate the View into. Like for a ListView, you would load each row into the list as the "group".
Anyways, if you want to dynamically show different layout file based upon what is clicked, yes Fragment's are one way to do that, and so are ViewStub's.
And you aren't actually calling inflate on the TextView because it is a static method. It is equivalent to doing this with a LayoutInflater
View v = LayoutInflater.from(YourActivity.this).inflate(R.layout.your_layout, null);
// TODO: Do something with v
The final code should look like:
#Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final RelativeLayout rl = (RelativeLayout) findViewById(R.id.splashScreenId);
TextView whatIsHumanTrafficing = (TextView) findViewById(R.id.whatIsHumanTrafficing);
whatIsHumanTrafficing.setOnClickListener(new View.OnClickListener(){
public void onClick(View view){
MainActivity.this.setContentView(R.layout.what_is_human_trafficing);
}
});
}
Set an on click listener to the text view then within it on MainActivity.this set the content view to the layout you want.
What is the use of LayoutInflater in Android?
The LayoutInflater class is used to instantiate the contents of layout XML files into their corresponding View objects.
In other words, it takes an XML file as input and builds the View objects from it.
What does LayoutInflator do?
When I first started Android programming, I was really confused by LayoutInflater and findViewById. Sometimes we used one and sometimes the other.
LayoutInflater is used to create a new View (or Layout) object from one of your xml layouts.
findViewById just gives you a reference to a view than has already been created. You might think that you haven't created any views yet, but whenever you call setContentView in onCreate, the activity's layout along with its subviews gets inflated (created) behind the scenes.
So if the view already exists, then use findViewById. If not, then create it with a LayoutInflater.
Example
Here is a mini project I made that shows both LayoutInflater and findViewById in action. With no special code, the layout looks like this.
The blue square is a custom layout inserted into the main layout with include (see here for more). It was inflated automatically because it is part of the content view. As you can see, there is nothing special about the code.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
Now let's inflate (create) another copy of our custom layout and add it in.
LayoutInflater inflater = getLayoutInflater();
View myLayout = inflater.inflate(R.layout.my_layout, mainLayout, false);
To inflate the new view layout, all I did was tell the inflater the name of my xml file (my_layout), the parent layout that I want to add it to (mainLayout), and that I don't actually want to add it yet (false). (I could also set the parent to null, but then the layout parameters of my custom layout's root view would be ignored.)
Here it is again in context.
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// inflate the main layout for the activity
setContentView(R.layout.activity_main);
// get a reference to the already created main layout
LinearLayout mainLayout = (LinearLayout) findViewById(R.id.activity_main_layout);
// inflate (create) another copy of our custom layout
LayoutInflater inflater = getLayoutInflater();
View myLayout = inflater.inflate(R.layout.my_layout, mainLayout, false);
// make changes to our custom layout and its subviews
myLayout.setBackgroundColor(ContextCompat.getColor(this, R.color.colorAccent));
TextView textView = (TextView) myLayout.findViewById(R.id.textView);
textView.setText("New Layout");
// add our custom layout to the main layout
mainLayout.addView(myLayout);
}
}
Notice how findViewById is used only after a layout has already been inflated.
Supplemental Code
Here is the xml for the example above.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_main_layout"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp">
<!-- Here is the inserted layout -->
<include layout="#layout/my_layout"/>
</LinearLayout>
my_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="100dp"
android:layout_height="100dp"
android:background="#color/colorPrimary">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:padding="5dp"
android:textColor="#android:color/white"
android:text="My Layout"/>
</RelativeLayout>
When do you need LayoutInflater
The most common time most people use it is in a RecyclerView. (See these RecyclerView examples for a list or a grid.) You have to inflate a new layout for every single visible item in the list or grid.
You also can use a layout inflater if you have a complex layout that you want to add programmatically (like we did in our example). You could do it all in code, but it is much easier to define it in xml first and then just inflate it.
When you use a custom view in a ListView you must define the row layout.
You create an xml where you place android widgets and then in the adapter's code you have to do something like this:
public MyAdapter(Context context, List<MyObject> objects) extends ArrayAdapter {
super(context, 1, objects);
/* We get the inflator in the constructor */
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view;
/* We inflate the xml which gives us a view */
view = mInflater.inflate(R.layout.my_list_custom_row, parent, false);
/* Get the item in the adapter */
MyObject myObject = getItem(position);
/* Get the widget with id name which is defined in the xml of the row */
TextView name = (TextView) view.findViewById(R.id.name);
/* Populate the row's xml with info from the item */
name.setText(myObject.getName());
/* Return the generated view */
return view;
}
Read more in the official documentation.
LayoutInflater.inflate() provides a means to convert a res/layout/*.xml file defining a view into an actual View object usable in your application source code.
basic two steps: get the inflater and then inflate the resource
How do you get the inflater?
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
How do you get the view assuming the xml file is "list_item.xml"?
View view = inflater.inflate(R.layout.list_item, parent, false);
Here is another example similar to the previous one, but extended to further demonstrate inflate parameters and dynamic behavior it can provide.
Suppose your ListView row layout can have variable number of TextViews. So first you inflate the base item View (just like the previous example), and then loop dynamically adding TextViews at run-time. Using android:layout_weight additionally aligns everything perfectly.
Here are the Layouts resources:
list_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="#+id/field1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"/>
<TextView
android:id="#+id/field2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
/>
</LinearLayout>
schedule_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"/>
Override getView method in extension of BaseAdapter class
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = activity.getLayoutInflater();
View lst_item_view = inflater.inflate(R.layout.list_layout, null);
TextView t1 = (TextView) lst_item_view.findViewById(R.id.field1);
TextView t2 = (TextView) lst_item_view.findViewById(R.id.field2);
t1.setText("some value");
t2.setText("another value");
// dinamically add TextViews for each item in ArrayList list_schedule
for(int i = 0; i < list_schedule.size(); i++){
View schedule_view = inflater.inflate(R.layout.schedule_layout, (ViewGroup) lst_item_view, false);
((TextView)schedule_view).setText(list_schedule.get(i));
((ViewGroup) lst_item_view).addView(schedule_view);
}
return lst_item_view;
}
Note different inflate method calls:
inflater.inflate(R.layout.list_layout, null); // no parent
inflater.inflate(R.layout.schedule_layout, (ViewGroup) lst_item_view, false); // with parent preserving LayoutParams
This class is used to instantiate layout XML file into its corresponding View objects. It is never be used directly -- use getLayoutInflater() or getSystemService(String) to retrieve a standard LayoutInflater instance that is already hooked up to the current context and correctly configured for the device you are running on. For example:
LayoutInflater inflater = (LayoutInflater)context.getSystemService
(Context.LAYOUT_INFLATER_SERVICE);
Reference: http://developer.android.com/reference/android/view/LayoutInflater.html
LayoutInflater is a class used to instantiate layout XML file into its corresponding view objects which can be used in Java programs.
In simple terms, there are two ways to create UI in android. One is a static way and another is dynamic or programmatically.
Suppose we have a simple layout main.xml having one textview and one edittext as follows.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/layout1"
>
<TextView
android:id="#+id/namelabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Enter your name"
android:textAppearance="?android:attr/textAppearanceLarge" >
</TextView>
<EditText
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginTop="14dp"
android:ems="10">
</EditText>
</LinearLayout>
We can display this layout in static way by
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
A dynamic way of creating a view means the view is not mentioned in our main.xml but we want to show with this in run time. For example, we have another XML in layout folder as footer.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/TextView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="Add your record"
android:textSize="24sp" >
</TextView>
We want to show this textbox in run time within our main UI. So here we will inflate text.xml. See how:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
TextView t = (TextView)inflater.inflate(R.layout.footer,null);
lLayout = (LinearLayout)findViewById(R.id.layout1);
lLayout.addView(t);
Here I have used getSystemService (String) to retrieve a LayoutInflater instance. I can use getLayoutInflator() too to inflate instead of using getSystemService (String) like below:
LayoutInflator inflater = getLayoutInflater();
TextView t = (TextView) inflater.inflate(R.layout.footer, null);
lLayout.addView(t);
Inflating means reading the XML file that describes a layout (or GUI element) and to create the actual objects that correspond to it, and thus make the object visible within an Android app.
final Dialog mDateTimeDialog = new Dialog(MainActivity.this);
// Inflate the root layout
final RelativeLayout mDateTimeDialogView = (RelativeLayout) getLayoutInflater().inflate(R.layout.date_time_dialog, null);
// Grab widget instance
final DateTimePicker mDateTimePicker = (DateTimePicker) mDateTimeDialogView.findViewById(R.id.DateTimePicker);
This file could saved as date_time_dialog.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/DateTimeDialog" android:layout_width="100px"
android:layout_height="wrap_content">
<com.dt.datetimepicker.DateTimePicker
android:id="#+id/DateTimePicker" android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<LinearLayout android:id="#+id/ControlButtons"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_below="#+id/DateTimePicker"
android:padding="5dip">
<Button android:id="#+id/SetDateTime" android:layout_width="0dip"
android:text="#android:string/ok" android:layout_weight="1"
android:layout_height="wrap_content"
/>
<Button android:id="#+id/ResetDateTime" android:layout_width="0dip"
android:text="Reset" android:layout_weight="1"
android:layout_height="wrap_content"
/>
<Button android:id="#+id/CancelDialog" android:layout_width="0dip"
android:text="#android:string/cancel" android:layout_weight="1"
android:layout_height="wrap_content"
/>
</LinearLayout>
This file could saved as date_time_picker.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="wrap_content" `enter code here`
android:padding="5dip" android:id="#+id/DateTimePicker">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:baselineAligned="true"
android:orientation="horizontal">
<LinearLayout
android:id="#+id/month_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="1dp"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="vertical">
<Button
android:id="#+id/month_plus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_up_final"/>
<EditText
android:id="#+id/month_display"
android:layout_width="45dp"
android:layout_height="35dp"
android:background="#drawable/picker_middle"
android:focusable="false"
android:gravity="center"
android:singleLine="true"
android:textColor="#000000">
</EditText>
<Button
android:id="#+id/month_minus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_down_final"/>
</LinearLayout>
<LinearLayout
android:id="#+id/date_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="0.5dp"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="vertical">
<Button
android:id="#+id/date_plus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_up_final"/>
<EditText
android:id="#+id/date_display"
android:layout_width="45dp"
android:layout_height="35dp"
android:background="#drawable/picker_middle"
android:gravity="center"
android:focusable="false"
android:inputType="number"
android:textColor="#000000"
android:singleLine="true"/>
<Button
android:id="#+id/date_minus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_down_final"/>
</LinearLayout>
<LinearLayout
android:id="#+id/year_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="0.5dp"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="vertical">
<Button
android:id="#+id/year_plus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_up_final"/>
<EditText
android:id="#+id/year_display"
android:layout_width="45dp"
android:layout_height="35dp"
android:background="#drawable/picker_middle"
android:gravity="center"
android:focusable="false"
android:inputType="number"
android:textColor="#000000"
android:singleLine="true"/>
<Button
android:id="#+id/year_minus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_down_final"/>
</LinearLayout>
<LinearLayout
android:id="#+id/hour_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="vertical">
<Button
android:id="#+id/hour_plus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_up_final"/>
<EditText
android:id="#+id/hour_display"
android:layout_width="45dp"
android:layout_height="35dp"
android:background="#drawable/picker_middle"
android:gravity="center"
android:focusable="false"
android:inputType="number"
android:textColor="#000000"
android:singleLine="true">
</EditText>
<Button
android:id="#+id/hour_minus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_down_final"/>
</LinearLayout>
<LinearLayout
android:id="#+id/min_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="0.35dp"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="vertical">
<Button
android:id="#+id/min_plus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_up_final"/>
<EditText
android:id="#+id/min_display"
android:layout_width="45dp"
android:layout_height="35dp"
android:background="#drawable/picker_middle"
android:gravity="center"
android:focusable="false"
android:inputType="number"
android:textColor="#000000"
android:singleLine="true"/>
<Button
android:id="#+id/min_minus"
android:layout_width="45dp"
android:layout_height="45dp"
android:background="#drawable/image_button_down_final"/>
</LinearLayout>
<LinearLayout
android:id="#+id/meridiem_container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="0.35dp"
android:layout_marginTop="5dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:orientation="vertical">
<ToggleButton
android:id="#+id/toggle_display"
style="#style/SpecialToggleButton"
android:layout_width="40dp"
android:layout_height="32dp"
android:layout_marginLeft="5dp"
android:layout_marginTop="45dp"
android:layout_marginRight="5dp"
android:layout_marginBottom="5dp"
android:padding="5dp"
android:gravity="center"
android:textOn="#string/meridiem_AM"
android:textOff="#string/meridiem_PM"
android:checked="true"/>
<!-- android:checked="true" -->
</LinearLayout>
</LinearLayout>
</RelativeLayout>
The MainActivity class saved as MainActivity.java:
public class MainActivity extends Activity {
EditText editText;
Button button_click;
public static Activity me = null;
String meridiem;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = (EditText)findViewById(R.id.edittext1);
button_click = (Button)findViewById(R.id.button1);
button_click.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View view){
final Dialog mDateTimeDialog = new Dialog(MainActivity.this);
final RelativeLayout mDateTimeDialogView = (RelativeLayout) getLayoutInflater().inflate(R.layout.date_time_dialog, null);
final DateTimePicker mDateTimePicker = (DateTimePicker) mDateTimeDialogView.findViewById(R.id.DateTimePicker);
// mDateTimePicker.setDateChangedListener();
((Button) mDateTimeDialogView.findViewById(R.id.SetDateTime)).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
mDateTimePicker.clearFocus();
int hour = mDateTimePicker.getHour();
String result_string = mDateTimePicker.getMonth() +" "+ String.valueOf(mDateTimePicker.getDay()) + ", " + String.valueOf(mDateTimePicker.getYear())
+ " " +(mDateTimePicker.getHour()<=9? String.valueOf("0"+mDateTimePicker.getHour()) : String.valueOf(mDateTimePicker.getHour())) + ":" + (mDateTimePicker.getMinute()<=9?String.valueOf("0"+mDateTimePicker.getMinute()):String.valueOf(mDateTimePicker.getMinute()))+" "+mDateTimePicker.getMeridiem();
editText.setText(result_string);
mDateTimeDialog.dismiss();
}
});
// Cancel the dialog when the "Cancel" button is clicked
((Button) mDateTimeDialogView.findViewById(R.id.CancelDialog)).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
mDateTimeDialog.cancel();
}
});
// Reset Date and Time pickers when the "Reset" button is clicked
((Button) mDateTimeDialogView.findViewById(R.id.ResetDateTime)).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
mDateTimePicker.reset();
}
});
// Setup TimePicker
// No title on the dialog window
mDateTimeDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
// Set the dialog content view
mDateTimeDialog.setContentView(mDateTimeDialogView);
// Display the dialog
mDateTimeDialog.show();
}
});
}
}
What inflater does
It takes a xml layout as input (say) and converts it to View object.
Why needed
Let us think a scenario where we need to create a custom listview. Now each row should be custom. But how can we do it. Its not possible to assign a xml layout to a row of listview. So, we create a View object. Thus we can access the elements in it (textview,imageview etc) and also assign the object as row of listview
So, whenever we need to assign view type object somewhere and we have our custom xml design we just convert it to object by inflater and use it.
here is an example for geting a refrence for the root View of a layout ,
inflating it and using it with setContentView(View view)
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LayoutInflater li=getLayoutInflater();
View rootView=li.inflate(R.layout.activity_main,null);
setContentView(rootView);
}
Layout inflater is a class that reads the xml appearance description and convert them into java based View objects.
LayoutInflater creates View objects based on layouts defined in XML. There are several different ways to use LayoutInflater, including creating custom Views, inflating Fragment views into Activity views, creating Dialogs, or simply inflating a layout file View into an Activity.
There are a lot of misconceptions about how the inflation process works. I think this comes from poor of the documentation for the inflate() method. If you want to learn about the inflate() method in detail, I wrote a blog post about it here:
https://www.bignerdranch.com/blog/understanding-androids-layoutinflater-inflate/
my customize list hope it illustrate concept
public class second extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
// TextView textview=(TextView)findViewById(R.id.textView1);
// textview.setText(getIntent().getExtras().getString("value"));
setListAdapter(new MyAdapter(this,R.layout.list_item,R.id.textView1, getResources().getStringArray(R.array.counteries)));
}
private class MyAdapter extends ArrayAdapter<String>{
public MyAdapter(Context context, int resource, int textViewResourceId,
String[] objects) {
super(context, resource, textViewResourceId, objects);
// TODO Auto-generated constructor stub
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row=inflater.inflate(R.layout.list_item,parent,false);
String[]items=getResources().getStringArray(R.array.counteries);
ImageView iv=(ImageView) row.findViewById(R.id.imageView1);
TextView tv=(TextView) row.findViewById(R.id.textView1);
tv.setText(items[position]);
if(items[position].equals("unitedstates")){
iv.setImageResource(R.drawable.usa);
}else if(items[position].equals("Russia")){
iv.setImageResource(R.drawable.russia);
}else if(items[position].equals("Japan")){
iv.setImageResource(R.drawable.japan);
}
// TODO Auto-generated method stub
return row;
}
}
}
LayoutInflater is a fundamental component in Android. You must use it all the time to turn xml files into view hierarchies.
Inflater actually some sort of convert to data, views, instances, to visible UI representation.. ..thus it make use of data feed into from maybe adapters, etc. programmatically. then integrating it with an xml you defined, that tells it how the data should be represented in UI
Is it possible to use a OnItemClickListener on a ListView when the Items layout has a clickable/editable widget (RadioButton,EditText, or CheckBox)?
You might want to take a look at this issue. Having a focusable item in a row of a ListView causes the OnItemClickListener NOT to be invoked. However, that does not mean you cannot have focusable/clickable items in a row, there are some workarounds like this one.
Also, you can take a look at the Call Logs screen. It has a ListView with clickable item(the call icon on the right).
See Source code here
Quoting comment #31 in the link mentioned by Samuh (which solved the problem for me):
In fact you can add it to the layout XML (if inflated by one): android:descendantFocusability="blocksDescendants".
Adding here JIC that webpage is down in the future.
If any row item of list contains focusable or clickable view then OnItemClickListener won't work.
row item must be having param like android:descendantFocusability="blocksDescendants"
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:baselineAligned="false"
android:descendantFocusability="blocksDescendants"
android:gravity="center_vertical" >
// your other widgets here
</LinearLayout>
Tried many complex solutions, but this was the simplest one that worked:
Just use android:focusable="false" as in:
<CheckBox
android:id="#+id/fav_check_box"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false" />
Two best solution
Add android:descendantFocusability="beforeDescendants" to listView
in xml OR
Set given two attributes to false
like
android:focusable="false"
android:focusableInTouchMode="false"
Then it will handle the listView row item child(Button,EditText etc) events instead of listView.setOnItemClick .
I fixed my problem different , in my item I have more than one LinearLayout
so if you give id to your linearayout and setOnclickListener in adapter class it will work, only original effect of touching will dissapear.
but this link Making a LinearLayout act like an Button is usefull to make linearlaout act like button on click
item
<?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:layout_marginTop="10dp">
<TextView
android:id="#+id/txt_item_followers_name"
android:layout_width="250dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:gravity="center|start"
android:paddingLeft="15dp"
android:text="Ali"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ImageView
android:id="#+id/imageView"
android:layout_width="35dp"
android:layout_height="35dp"
android:layout_alignParentStart="true"
android:layout_below="#+id/txt_item_followers_name"
android:layout_marginLeft="10dp"
android:src="#drawable/puan_icon" />
<TextView
android:id="#+id/txt_item_followers_mark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/imageView"
android:layout_toEndOf="#+id/imageView"
android:background="#color/red_400"
android:paddingLeft="10dp"
android:text="25.5"
android:textAppearance="?android:attr/textAppearanceSmall" />
<LinearLayout
android:id="#+id/linear_one"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentTop="true"
android:layout_toEndOf="#+id/txt_item_followers_name"
android:background="#color/red_400"
android:orientation="vertical">
<ImageView
android:id="#+id/btn_item_followers_2b_follow"
android:layout_width="100dp"
android:layout_height="match_parent"
android:layout_alignParentEnd="true"
android:layout_marginLeft="10dp"
android:src="#drawable/follow_buton" />
</LinearLayout>
</RelativeLayout>
inside getView method
#Override
public View getView(final int position, View convertView,
ViewGroup parent) {
View view = convertView;
if (convertView == null)
view = inflater.inflate(R.layout.deneme, null);
final Followers2 myObj = myList.get(position);
LinearLayout linear_one = (LinearLayout) view.findViewById(R.id.linear_one); // HERE WE DOMUNİCATE IT
linear_one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(parentActivity, "One Two", Toast.LENGTH_SHORT).show();
}
});
TextView name = (TextView) view.findViewById(R.id.txt_item_followers_name);
TextView mark = (TextView) view.findViewById(R.id.txt_item_followers_mark);
final ImageView btn_follow = (ImageView) view.findViewById(R.id.btn_item_followers_2b_follow);
name.setText(myObj.getName());
mark.setText(myObj.getScore());
/* if (myObj.isFollow() == true) {
btn_follow.setImageResource(R.drawable.following_buton);
} else {
btn_follow.setImageResource(R.drawable.follow_buton);
}
btn_follow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Followers2 myObj = myList.get(position);
if (myObj.isFollow() == true) {
btn_follow.setImageResource(R.drawable.following_buton);
} else {
btn_follow.setImageResource(R.drawable.follow_buton);
}
}
});*/
return view;
}