I'm trying to call setText() method of a TextView frequently to display time on a second thread. The TextView is a part of a layout which added programmatically to the MainActivity's root view. The app crashes when I try to call setText() due to the error.
NullPointerException: Attempt to invoke virtual method on a null
object reference
I have tried accessing the TextView with different approaches, but every time it threw the same NullPointerException. The only solution that I know is to add the layout I want to the activity_main.xml, but that's not quite what I want.
Here's how I inflate and add the views to a Linearlayout(id/WidgetScreen) inside the MainActivity.java and how I'm calling the setText() method.
ยดยดยด
LinearLayout WidgetScreen = (LinearLayout) findViewById(R.id.WidgetScreen);
mTime = getLayoutInflater().inflate(R.layout.widget_time, null);
mDate = (TextView) mTime.findViewById(R.id.TVdate);
mMEZ = (TextView) mTime.findViewById(R.id.TVmez);
mGMT = (TextView) mTime.findViewById(R.id.TVgmt);
WidgetScreen.addView(mTime);
// The code where I set time for TextView
while (!StopDateThread) {
final String mmTime = getformatedUST();
final String mmDate = getformatedDate();
final String mmGMT = getformatedGMT();
Log.d(TAG, "run: ");
try {
mMEZ.setText(mmTime);
mDate.setText(mmDate);
mGMT.setText(mmGMT);
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
widget_time.XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:orientation="vertical"
android:layout_width="match_parent"
android:id="#+id/WidgetTabTime"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_clock"
android:layout_marginTop="#dimen/LabelIconMarginTop"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="#dimen/LabelIconMarginStart"
android:layout_gravity="center"
android:contentDescription="CLOCK"
android:id="#+id/LabelIcon"/>
<View
android:id="#+id/view"
android:layout_width="match_parent"
android:layout_height="#dimen/StrokeWidth"
android:layout_marginTop="#dimen/LabelDividerMarginTop"
android:background="#color/colorAccent"
app:layout_constraintTop_toBottomOf="#id/LabelIcon" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
app:layout_constraintStart_toEndOf="#id/LabelIcon"
android:layout_marginStart="#dimen/LabelTextMarginStart"
app:layout_constraintBottom_toBottomOf="#id/LabelIcon"
android:text="#string/time"
android:textSize="#dimen/LabelText"/>
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Date:"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="#dimen/StatsMarginStart"
android:layout_marginTop="#dimen/StatsMarginTop"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
app:layout_constraintTop_toBottomOf="#+id/view" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/StatsMarginTop"
android:fontFamily="sans-serif-light"
android:text="MEZ:"
android:textColor="#color/colorAccent"
android:textSize="#dimen/StatsText"
app:layout_constraintStart_toStartOf="#+id/textView"
app:layout_constraintTop_toBottomOf="#+id/textView" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="GMT:"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
android:layout_marginTop="#dimen/StatsMarginTop"
app:layout_constraintStart_toStartOf="#+id/textView2"
app:layout_constraintTop_toBottomOf="#+id/textView2" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LST:"
android:layout_marginTop="#dimen/StatsMarginTop"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
app:layout_constraintStart_toStartOf="#+id/textView3"
app:layout_constraintTop_toBottomOf="#+id/textView3" />
<TextView
android:id="#+id/TVdate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/CurrentDate"
android:layout_marginEnd="#dimen/StatsMarginEnd"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
app:layout_constraintBottom_toBottomOf="#+id/textView"
app:layout_constraintEnd_toEndOf="parent" />
<TextView
android:id="#+id/TVmez"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/CurrentLocalTime"
android:layout_marginEnd="#dimen/StatsMarginEnd"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
app:layout_constraintBottom_toBottomOf="#+id/textView2"
app:layout_constraintEnd_toEndOf="parent" />
<TextView
android:id="#+id/TVgmt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/CurrentGMT"
android:layout_marginEnd="#dimen/StatsMarginEnd"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
app:layout_constraintBottom_toBottomOf="#+id/textView3"
app:layout_constraintEnd_toEndOf="parent" />
<TextView
android:id="#+id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="02:57:15"
android:layout_marginEnd="#dimen/StatsMarginEnd"
android:textColor="#color/colorAccent"
android:fontFamily="sans-serif-light"
android:textSize="#dimen/StatsText"
app:layout_constraintBottom_toBottomOf="#+id/textView4"
app:layout_constraintEnd_toEndOf="parent" />
<View
android:layout_width="match_parent"
android:layout_height="5dp"
app:layout_constraintTop_toBottomOf="#id/textView4"/>
<View
android:layout_width="match_parent"
android:layout_height="5dp"
app:layout_constraintTop_toBottomOf="#id/textView4"/>
</androidx.constraintlayout.widget.ConstraintLayout>
What would be the simplest way to access the setText() method?
you can't use findViewById() on inflated layout
you must add the inflated layout to your main layout via
mainLayout.addView(mTime);
as written here findViewById() returns null for an inflated layout
Related
Why do I always see the last id no matter which text I click?
I would like to see the right fragment displayed in the layout that i created according to the relevant text clicked. I always see the 'alternatives' fragment.
I understood that tags could be helped, but I could not figure out how to use them.
In addition, I tried to use diffrent versions of FragmentManager and FragmentTransaction and even to remove the switch and call each setOnClickListener of textview separately but nothing helped.
This is my Activity file:
IngredientsFragment ingredientsFragment;
FavouritesFragment favouritesFragment;
FeedbacksFragment feedbacksFragment;
Write_Feedback_Fragment writeFeedbackFragment;
AlternativesFragment alternativesFragment;
TextView ingredients;
TextView favourites;
TextView feedbacks;
TextView alternatives;
TextView writeFeedback;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_details);
window=this.getWindow();
window.setStatusBarColor(this.getResources().getColor(R.color.colorPrimaryDark));
ingredients= (TextView) findViewById(R.id.ingredients_option);
favourites= (TextView) findViewById(R.id.favorites_option);
feedbacks= (TextView) findViewById(R.id.watch_feedback_option);
writeFeedback= (TextView) findViewById(R.id.add_feedback_option);
alternatives= (TextView) findViewById(R.id.alternatives_option);
ingredients.setOnClickListener(this);
favourites.setOnClickListener(this);
feedbacks.setOnClickListener(this);
writeFeedback.setOnClickListener(this);
alternatives.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch (v.getId())
{
case R.id.ingredients_option:
ingredientsFragment= new IngredientsFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,ingredientsFragment).commit();
break;
case R.id.favorites_option:
favouritesFragment= new FavouritesFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,favouritesFragment).commit();
break;
case R.id.watch_feedback_option:
feedbacksFragment= new FeedbacksFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,feedbacksFragment).commit();
break;
case R.id.add_feedback_option:
writeFeedbackFragment= new Write_Feedback_Fragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,writeFeedbackFragment).commit();
break;
case R.id.alternatives_option:
alternativesFragment= new AlternativesFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,alternativesFragment).commit();
break;
}
}
}
This is my XML file:
<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"
tools:context=".ProductDetails">
<RelativeLayout
android:id="#+id/recommendation_template"
android:layout_width="match_parent"
android:layout_height="142dp"
android:background="#android:color/white">
<ImageView
android:id="#+id/registartion_arrow"
android:layout_width="45dp"
android:layout_height="34dp"
android:layout_alignParentRight="true"
android:src="#drawable/ic_arrow_forward_black_24dp" />
<TextView
android:id="#+id/rec_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingTop="10dp"
android:text="Recommendation:"
android:textSize="25dp"
android:textStyle="bold"
android:textColor="#android:color/black"/>
<ImageView
android:id="#+id/vi_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/rec_tv"
android:layout_alignParentLeft="true"
android:layout_marginLeft="0dp"
android:layout_marginTop="26dp"
android:paddingLeft="80dp"
android:src="#drawable/ic_check" />
<TextView
android:id="#+id/vi_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/vi_image"
android:layout_marginLeft="4dp"
android:layout_marginTop="-29dp"
android:layout_toRightOf="#id/vi_image"
android:text="This is for you"
android:textColor="#android:color/black"
android:textSize="20dp" />
<ImageView
android:id="#+id/not_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/vi_image"
android:layout_alignParentLeft="true"
android:layout_marginLeft="0dp"
android:layout_marginTop="3dp"
android:paddingLeft="80dp"
android:src="#drawable/ic_do_not" />
<TextView
android:id="#+id/not_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/not_image"
android:layout_marginLeft="5dp"
android:layout_marginTop="-27dp"
android:layout_toRightOf="#id/not_image"
android:text="Not for you"
android:textColor="#android:color/black"
android:textSize="20dp" />
</RelativeLayout>
<HorizontalScrollView
android:id="#+id/recommendation_scrollView"
android:layout_width="match_parent"
android:layout_height="83dp"
android:layout_below="#id/recommendation_template"
android:layout_marginTop="7dp">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/recommendation_template"
style="?android:attr/borderlessButtonStyle">
<TextView
android:id="#+id/ingredients_option"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:drawableTop="#drawable/ingredients"
android:text="Ingredients" />
<TextView
android:id="#+id/favorites_option"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:drawableTop="#drawable/ic_star"
android:paddingLeft="80dp"
android:text="Favorites" />
<TextView
android:id="#+id/watch_feedback_option"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:drawableTop="#drawable/customer_review"
android:paddingLeft="145dp"
android:text="Feedbacks" />
<TextView
android:id="#+id/add_feedback_option"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:drawableTop="#drawable/write_feedback"
android:paddingLeft="220dp"
android:text="Write feedback" />
<TextView
android:id="#+id/alternatives_option"
android:layout_width="408dp"
android:layout_height="90dp"
android:layout_gravity="left"
android:drawableTop="#drawable/ic_alternatives"
android:paddingLeft="320dp"
android:text="Alternatives" />
</FrameLayout>
</HorizontalScrollView>
<ScrollView
android:id="#+id/scrollView_container"
android:layout_width="match_parent"
android:layout_height="499dp"
android:layout_below="#id/recommendation_scrollView">
<RelativeLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="463dp">
</RelativeLayout>
</ScrollView>
</RelativeLayout>
Your code should work like that. The problem is your layout. See the textviews in your FrameLayout. Your defining a paddingLeft and layout_width so, that your textview alternatives_option is overlaying all the other textviews. Thats why in the onclick you always get the id of that view.
I suggest doing a tutorial about XML layout.
<TextView
android:id="#+id/alternatives_option"
android:layout_width="408dp"
android:layout_height="90dp"
android:layout_gravity="left"
android:drawableTop="#drawable/ic_alternatives"
android:paddingLeft="320dp"
android:text="Alternatives" />
I find that there is a quick way to create animation with ConstraintSet for ConstrainLayout Activity. Faster than use TransitionManager for RelativeLayout
ConstraintSet use two xml file for an Activity. One for the first position and next one for the destination.
I want to create something like this:
https://media.giphy.com/media/2UwXdWEoLWe9iQMFIY/giphy.gif
But there is no clearly instruction show how to use it in Java. Anyone had done this can show me the source code or link to some post like that.
Thanks for reading the post.
This is possible with ConstraintSet. They key is two have two layouts one layout has ui elements of the screen and the other has elements on the screen. Now you can use TransitionManager with interpolator and duration of your choice and animate the layout changes.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:id="#+id/constraint"
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:background="#181818"
tools:context=".MainActivity">
<ImageView
android:id="#+id/backgroundImage"
android:layout_width="0dp"
android:layout_height="0dp"
android:src="#drawable/mugello"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="JUNE 3, 2018"
app:layout_constraintRight_toRightOf="#+id/title"
app:layout_constraintBottom_toBottomOf="#+id/title"
android:textSize="12sp"
android:background="#d3d3d3"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:paddingTop="3dp"
android:paddingBottom="3dp"/>
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:background="#F44336"
android:paddingBottom="8dp"
android:paddingEnd="24dp"
android:paddingStart="24dp"
android:paddingTop="8dp"
android:text="Mugello Circuit"
android:textColor="#FFFF"
android:textSize="45sp"
app:layout_constraintRight_toLeftOf="#+id/backgroundImage"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="#+id/fadeBackgroudView"
android:layout_width="wrap_content"
android:layout_height="90dp"
android:foreground="#drawable/gradient_variant"
app:layout_constraintBottom_toTopOf="#+id/description" />
<TextView
android:id="#+id/tap"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="12dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="Tap for info"
android:textSize="15sp"
android:textColor="#ffffff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="The Mugello is a historic region and valley in northern Tuscany, in Italy. It is located to the north of the city of Florence and consists of the northernmost portion of the Metropolitan City of Florence. It is connected to the separate Santerno river valley by the Futa Pass."
android:textSize="22sp"
android:textColor="#FFFF"
android:background="#181818"
android:gravity="center"
android:paddingStart="8dp"
android:paddingEnd="8dp"
android:paddingBottom="8dp"
app:layout_constraintTop_toBottomOf="#+id/backgroundImage"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>
activity_main_detail.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity">
<ImageView
android:id="#+id/backgroundImage"
android:layout_width="0dp"
android:layout_height="0dp"
android:scaleType="centerCrop"
android:src="#drawable/mugello"
app:layout_constraintBottom_toTopOf="#+id/description"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="48dp"
android:background="#F44336"
android:paddingBottom="8dp"
android:paddingEnd="24dp"
android:paddingStart="24dp"
android:paddingTop="8dp"
android:text="Mugello Circuit"
android:textColor="#FFFF"
android:textSize="45sp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="JUNE 3, 2018"
app:layout_constraintRight_toRightOf="#+id/title"
app:layout_constraintTop_toBottomOf="#+id/title"
android:textSize="12sp"
android:background="#d3d3d3"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:paddingTop="3dp"
android:paddingBottom="3dp"/>
<View
android:id="#+id/fadeBackgroudView"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:foreground="#drawable/gradient"
app:layout_constraintBottom_toTopOf="#+id/description" />
<TextView
android:id="#+id/tap"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="Tap for info"
android:textSize="15sp"
android:textColor="#ffffff"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="#+id/description"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="The Mugello is a historic region and valley in northern Tuscany, in Italy. It is located to the north of the city of Florence and consists of the northernmost portion of the Metropolitan City of Florence. It is connected to the separate Santerno river valley by the Futa Pass."
android:textSize="22sp"
android:textColor="#FFFF"
android:gravity="center"
android:background="#181818"
android:paddingStart="8dp"
android:paddingEnd="8dp"
android:paddingBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private boolean show = false;
private ImageView backgroundImage;
private ConstraintLayout constraint;
private ConstraintSet constraintSet = new ConstraintSet();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
constraint = findViewById(R.id.constraint);
backgroundImage = findViewById(R.id.backgroundImage);
backgroundImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if(show)
hideComponents(); // if the animation is shown, we hide back the views
else
showComponents() ;// if the animation is NOT shown, we animate the views
}
});
}
private void showComponents(){
show = true;
constraintSet.clone(this, R.layout.activity_main_detail);
Transition transition = new ChangeBounds();
transition.setInterpolator(new AnticipateOvershootInterpolator(1.0f));
transition.setDuration(1000);
TransitionManager.beginDelayedTransition(constraint, transition);
constraintSet.applyTo(constraint);
}
private void hideComponents(){
show = false;
constraintSet.clone(this, R.layout.activity_main);
Transition transition = new ChangeBounds();
transition.setInterpolator(new AnticipateOvershootInterpolator(1.0f));
transition.setDuration(1000);
TransitionManager.beginDelayedTransition(constraint, transition);
constraintSet.applyTo(constraint);
}
}
Here's a slide share on ConstraintLayout https://speakerdeck.com/camaelon/advanced-animations-and-constraintlayout
I have a FloatingActionButton over a big EditText. When I launch the app and try to tap on the FloatingActionButton the keyboard flips up because it takes the tap of the EditText.
What do I need to change in my code such that the FloatingActionButton is "above" the EditText?
I found that I need to add the FloatingActionButton last, what I already did, such that it is on top, but it didn't work. I also have implemented an onClickListener, which I suppose is not the problem.
Here a screenshot of my layout: Layout Screenshot
<?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="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#drawable/listviewbackground"
android:backgroundTint="#80FFFFFF"
android:backgroundTintMode="src_over"
>
<EditText
android:id="#+id/itemTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true"
android:paddingLeft="5dp"
android:paddingTop="5dp"
android:hint="What do you need to do?"
android:textAlignment="center"
android:textAppearance="?attr/textAppearanceListItem"
android:textSize="30dp"
android:background="#android:color/transparent"/>
<android.support.constraint.ConstraintLayout
android:id="#+id/constraintLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/itemTitle"
android:paddingTop="50dp"
android:gravity="center"
android:orientation="horizontal"
android:weightSum="2"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true">
<TextView
android:id="#+id/DueDate"
android:layout_width="0dp"
android:layout_height="39dp"
android:layout_marginEnd="64dp"
android:layout_marginStart="40dp"
android:layout_weight="1"
android:text="Due Date"
android:textAlignment="textStart"
android:textSize="24dp"
app:layout_constraintEnd_toStartOf="#+id/Date"
app:layout_constraintStart_toStartOf="parent"
tools:layout_editor_absoluteY="0dp" />
<TextView
android:id="#+id/Date"
android:layout_width="110dp"
android:layout_height="33dp"
android:layout_marginEnd="32dp"
android:layout_weight="1.2"
android:clickable="true"
android:focusable="false"
android:onClick="openCalendarView"
android:textAlignment="center"
android:textSize="18dp"
app:layout_constraintEnd_toEndOf="parent"
tools:layout_editor_absoluteY="0dp" />
<TextView
android:id="#+id/Important"
android:layout_width="149dp"
android:layout_height="39dp"
android:layout_marginBottom="8dp"
android:layout_marginStart="40dp"
android:layout_marginTop="8dp"
android:text="Is important?"
android:textAlignment="textStart"
android:textSize="24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DueDate"
app:layout_constraintVertical_bias="0.0" />
<Switch
android:id="#+id/switch1"
android:layout_width="51dp"
android:layout_height="40dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_toRightOf="#id/Important"
android:gravity="center"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.59"
app:layout_constraintStart_toEndOf="#+id/Important"
app:layout_constraintTop_toBottomOf="#+id/Date"></Switch>
</android.support.constraint.ConstraintLayout>
<EditText
android:id="#+id/Description"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true"
android:layout_below="#id/constraintLayout1"
android:background="#android:color/transparent"
android:hint="Put in your description"
android:inputType="textPersonName"
android:nextFocusLeft="#id/Description"
android:nextFocusUp="#id/Description"
android:paddingTop="20dp"
android:textAlignment="center"
android:textSize="18dp" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/floatingButtonDone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:paddingRight="5dp"
android:paddingLeft="5dp"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#drawable/check"
android:backgroundTint="#color/Green"
android:layout_alignBottom="#id/Description"
android:layout_alignParentRight="true"
android:focusable="true"
/>
</RelativeLayout>
Here my onClickListener
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_itemdetail, container, false);
//Getting Data and Creation of ToDoItem Object
FloatingActionButton floatingbutton = view.findViewById(R.id.floatingButtonDone);
floatingbutton.bringToFront();
floatingbutton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//Getting Data
try {
//Do something
} catch (Exception e) {
Snackbar.make(view, "You need to set a Title", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
}
});
Put your FloatingActionButton inside a frame layout and set its gravity and padding accordingly where you want to show it.
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
<android.support.design.widget.FloatingActionButton
android:id="#+id/floatingButtonDone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#color/Green"
android:contentDescription="#null"
android:gravity="bottom|end"
android:padding="3dp"
android:src="#drawable/check" />
</FrameLayout>
I'm trying to generate form elements from a template when the user clicks on a button. I created the template and the container layout for the new forms with XML. Its successfully generating the first form where I'm telling it to generate, but when I try to generate more forms beyond the first one its giving me an error: "the specified child already has a parent. You must call removeView() on the child's first parent". Any clue as to what I should do so as to generate more than one element? I've tried changing the id of the newly created forms but that's giving me a null pointer exception and crashing. Thank you.
public class MakeQuestion extends Activity implements OnClickListener{
private static final int MY_BUTTON = 9000;
int templateID = 1;
Button b;
Button target;
View insertPoint;
Button testTemplate;
View v1;
RelativeLayout.LayoutParams templateParams;
LayoutInflater vi;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.make_question);
Initialize();
}
public void Initialize(){
//button for adding new forms
b = (Button) findViewById(R.id.makeLayoutButton);
b.setOnClickListener(this);
//get the template form to be duplicated
vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v1 = vi.inflate(R.layout.form_template, null);
//set the params for the element that will have dynamically generated content below it
templateParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
//container where forms will be contained in
insertPoint = findViewById(R.id.questionsContainer);
//view where new form will go below
View belowContainer = findViewById(R.id.questionTemplateFake);
//set id for layout params of view
belowContainer.setId(1);
//set rule for new forms to go below view 'belowContainer'
templateParams.addRule(RelativeLayout.BELOW, belowContainer.getId());
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.makeLayoutButton:
v1 = vi.inflate(R.layout.form_template, null);
//add view to the insertPoint
((LinearLayout) insertPoint).addView(v1);
break;
}
}
}
Added forms should go in "questionsContainer" which is set to be below "questionTemplateFake"
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:android1="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/grey_background" >
<RelativeLayout
android:id="#+id/relativeLayout1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#8B459A"
android:baselineAligned="false"
android:clipToPadding="false" >
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/logo_small" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="15dp"
android:src="#drawable/settings" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="15dp"
android:src="#drawable/search" />
</RelativeLayout>
<ScrollView
android:id="#+id/scrollView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="#+id/relativeLayout1" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="vertical" >
<RelativeLayout
android:id="#+id/relative12"
android:layout_width="270dp"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="WHAT IS YOUR QUESTION?" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/save_button"
android:layout_alignBottom="#+id/save_button"
android:layout_alignRight="#+id/textView1"
android:text="ADD PICTURE OR VIDEO"
android:textSize="10sp" />
<EditText
android:id="#+id/editText1"
android:layout_width="match_parent"
android:layout_height="25dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView1"
android:layout_marginTop="14dp"
android:background="#drawable/textlines"
android:ems="10"
android:hint="50 WORDS OR LESS"
android:inputType="textMultiLine"
android:paddingLeft="5dp" />
<Button
android:id="#+id/save_button"
android:layout_width="75dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_below="#+id/editText1"
android:layout_marginTop="16dp"
android:background="#drawable/purplebutton"
android:text="BROWSE"
android:textColor="#drawable/button_text_color"
android:textSize="10sp" />
<TextView
android:id="#+id/TextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/save_button"
android:layout_marginTop="25dp"
android:text="CREATE AN ANSWER" />
<RelativeLayout
android:id="#+id/questionTemplateFake"
android:layout_width="wrap_content"
android:layout_height="60dp"
android:layout_alignParentLeft="true"
android:layout_below="#+id/TextView01" >
<Button
android:id="#+id/Button02eew"
android:layout_width="75dp"
android:layout_height="20dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="#drawable/purplebutton"
android:text="BROWSE"
android:textColor="#drawable/button_text_color"
android:textSize="10sp" />
<EditText
android:id="#+id/EditText02"
android:layout_width="match_parent"
android:layout_height="25dp"
android:layout_above="#+id/Button02"
android:layout_alignParentLeft="true"
android:background="#drawable/textlines"
android:ems="10"
android:hint="50 WORDS OR LESS"
android:inputType="textMultiLine"
android:paddingLeft="5dp" >
<requestFocus />
</EditText>
<TextView
android:id="#+id/TextView03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginRight="19dp"
android:layout_toLeftOf="#+id/Button02"
android:text="ADD PICTURE OR VIDEO"
android:textSize="10sp" />
</RelativeLayout>
<LinearLayout
android:id="#+id/questionsContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80dp"
android:layout_marginTop="20dp"
android:orientation="vertical"
android:layout_below="#+id/questionTemplateFake"
>
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</ScrollView>
<Button
android:id="#+id/makeLayoutButton"
android:layout_width="100dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_below="#+id/scrollView1"
android:layout_marginRight="17dp"
android:layout_marginTop="79dp"
android:background="#drawable/purplebutton"
android:text="MORE OPTIONS"
android:textColor="#drawable/button_text_color"
android:textSize="10sp" />
</RelativeLayout>
You are trying to add the same instance over and over again. Thus the message that "specific child already exists". You would have to create a new template layout instance with different ID (I suppose) and then try to add it in.
So rather than:
((RelativeLayout) insertPoint).addView(v1, templateParams);
and adding v1 again. Create a new instance
v1 = vi.inflate(R.layout.form_template, null);
set the id for good measures and then add it again in view.
I suppose you don't need to set the id, but you can read more about how id's work here
Hi i'm using eclipse for deveoping this android app. I'm inflating a layout using inflator and everything works fine.. I'm adding those inflated items one by one to another layout, so when the device's orientation is changed, all those inflated items are gone. The application seems like it has been restarted. But some values are still remaining.. Please help..
public void addNewItem() {
LayoutInflater li = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View item = li.inflate(R.layout.activity_order_items, null);
orderItemFrameView.add(item);
itemsLayout.addView(item);
setAdditionalFonts(item);
}
private void setAdditionalFonts(View view) {
TextView lblNameTak = (TextView)view.findViewById(R.id.tak_itemNo);
AutoCompleteTextView txtNameTak = (AutoCompleteTextView)view.findViewById(R.id.tak_itemName);
ImageView barScan = (ImageView)view.findViewById(R.id.barcode_scan);
TextView lblRate = (TextView)view.findViewById(R.id.tak_lblRate);
TextView lblQty = (TextView)view.findViewById(R.id.tak_lblQty);
TextView lblTotal = (TextView)view.findViewById(R.id.tak_lblTotal);
TextView rate = (TextView)view.findViewById(R.id.tak_Rate);
EditText2 qty = (EditText2)view.findViewById(R.id.tak_Qty);
TextView total = (TextView)view.findViewById(R.id.tak_Total);
qty.totTextView = total;
qty.rateTextView = rate;
qty.orderTake = this;
qty.index = orderItemFrameView.size() - 1;
qty.sqlDb = SqlDb;
qty.itemName = txtNameTak;
setupBarcodeScan(barScan);
Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/ubuntu-l.ttf");
Typeface tf2 = Typeface.createFromAsset(getAssets(), "fonts/calibri.ttf");
Typeface tf3 = Typeface.createFromAsset(getAssets(), "fonts/ubu-r.ttf");
Typeface tf4 = Typeface.createFromAsset(getAssets(), "fonts/tahoma.ttf");
lblNameTak.setTypeface(tf3);
txtNameTak.setTypeface(tf2);
lblRate.setTypeface(tf2);
lblQty.setTypeface(tf2);
lblTotal.setTypeface(tf2);
lblNameTak.setText("Item " + (qty.index + 1));
DbAdapterItem dbItem;
TextAdapterItem txtItem;
dbItem = new DbAdapterItem(this, SqlDb);
txtItem = new TextAdapterItem(dbItem, this, qty);
txtNameTak.setAdapter(txtItem);
txtNameTak.setOnItemClickListener(txtItem);
txtNameTak.requestFocus();
}
all these items created by addNewItem() are vanished...
here is the layout from which i'm inflating...
<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 ="22dp"
tools:context=".OrderItems" >
<FrameLayout
android:layout_width="match_parent"
android:background= "#888888"
android:layout_height="98dp" >
<TextView
android:id="#+id/tak_itemNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="15dp"
android:layout_marginTop="2.7dp"
android:text="Item 1"
android:layout_gravity="right"
android:textColor="#DDDDDD" />
<LinearLayout
android:layout_width="match_parent"
android:layout_marginTop="22dp"
android:orientation="vertical"
android:background= "#FFFFFF"
android:layout_height="75dp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<AutoCompleteTextView
android:id="#+id/tak_itemName"
android:imeOptions="actionUnspecified"
android:imeActionLabel="search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="0dp"
android:layout_weight="1.06"
android:completionThreshold="1"
android:ems="10"
android:hint="Item Name / Barcode"
android:inputType="textCapWords"
android:singleLine="true"
android:textColorHint="#DDDDDD" />
<ImageView
android:id="#+id/barcode_scan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="7dp"
android:paddingRight="7dp"
android:paddingTop="6dp"
android:src="#android:drawable/ic_menu_camera" />
</LinearLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<FrameLayout
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="left"
>
<TextView
android:id="#+id/tak_lblRate"
android:layout_width="wrap_content"
android:layout_marginLeft="7dp"
android:layout_height="wrap_content"
android:textColor="#555555"
android:textSize="10sp"
android:text="Rate" />
<TextView
android:id="#+id/tak_Rate"
android:layout_width="match_parent"
android:layout_marginTop="12dp"
android:layout_marginRight="15dp"
android:layout_height="wrap_content"
android:gravity="right"
android:textSize="16sp"
android:text="0.00" />
</FrameLayout>
<FrameLayout
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
>
<TextView
android:id="#+id/tak_lblQty"
android:layout_width="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginRight="7dp"
android:layout_height="wrap_content"
android:textColor="#555555"
android:textSize="10sp"
android:text="Qty" />
<com.sayka.ordergadget.EditText2
android:id="#+id/tak_Qty"
android:layout_width="match_parent"
android:layout_marginBottom="-4dp"
android:layout_marginTop="4dp"
android:inputType="numberDecimal"
android:imeOptions="actionNext"
android:layout_marginLeft="12dp"
android:layout_height="wrap_content"
android:gravity="center"
android:textSize="16sp"
android:text="0.0" />
</FrameLayout>
<FrameLayout
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_gravity="right"
>
<TextView
android:id="#+id/tak_lblTotal"
android:layout_width="wrap_content"
android:layout_marginLeft="7dp"
android:layout_gravity="left"
android:layout_height="wrap_content"
android:textColor="#555555"
android:textSize="10sp"
android:text="Total" />
<TextView
android:id="#+id/tak_Total"
android:layout_width="match_parent"
android:layout_gravity="right"
android:layout_marginTop="12dp"
android:layout_marginRight="15dp"
android:layout_height="wrap_content"
android:gravity="right"
android:textSize="16sp"
android:text="0.00" />
</FrameLayout>
</FrameLayout>
</LinearLayout>
</FrameLayout>
It's normal behaviour and you are correct. the activity is recreated from scratch on rotation.
If you want something to persist. store it during onSaveInstanceState in the provided bundle.
then during onCreate check to see if the bundle is null, if it isn't, pull your data out and add the view elements again.
Alternatively you can fudge it and state in the manifest that your activity will handle orientation/configuration changes.