Develop Reference

Fill the screen with 2 RadioButtons?

How to fill a ConstraintLayout with two radioButtons inside of a RadioGroup? I can't find a way to do it. I post here two images, one is how I want to make it look, and the other is how it looks right now with my code.
This is how it looks right now
This is how I want
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/constraintLayout6">
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<RadioButton
android:id="#+id/radioButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/radio_selector"
android:button="#color/transparent"
android:elevation="4dp"
android:padding="16dp"
android:text="Paypal"
android:textAlignment="center" />
<RadioButton
android:id="#+id/radioButton2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/radio_selector"
android:button="#color/transparent"
android:elevation="4dp"
android:padding="16dp"
android:text="Contrarreembolso"
android:textAlignment="center" />
</RadioGroup>
</androidx.constraintlayout.widget.ConstraintLayout>

The best thing that I could do after reading some answers on StackOverflow and trying many things is to get to this point:
I have taken this layout:
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<RadioGroup
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<RadioButton
android:id="#+id/radioButton"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_gravity="center"
android:background="#193312"
android:elevation="4dp"
android:text="Paypal"
android:textAlignment="center" />
<RadioButton
android:id="#+id/radioButton2"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#122B33"
android:elevation="4dp"
android:gravity="center"
android:text="Contrarreembolso"
android:textAlignment="center" />
</RadioGroup>
</androidx.constraintlayout.widget.ConstraintLayout>
And used this code to get the height of the screen and put half of it on my views, inside your activity:
#Override
protected void onStart() {
super.onStart();
//Get the height is the screen
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int height = size.y;
DisplayMetrics displayMetrics = new DisplayMetrics();
RadioButton radioButton1 = findViewById(R.id.radioButton);
RadioButton radioButton2 = findViewById(R.id.radioButton2);
//Give view half of the screen height
ViewGroup.LayoutParams params = radioButton1.getLayoutParams();
params.height = (height)/2;
ViewGroup.LayoutParams params2 = radioButton2.getLayoutParams();
params2.height = (height)/2;
}
Notice that this layout is not perfect looking, your radio buttons do spread across your device in height but they are not equal, the one thing left to do if you want your button to be equal in height is to calculate the action bar height and take it into account.

Calculate the height i dp got wrong

The main problem here is that the parent layout is nested scroll view so the height must be wrap content
so the view is like first image
what I want is to make the "don't have an account? register" TextView
to be at the bottom of the screen so I calculate the height of my
phone then the height of layout to subtract to subtract them and
assign the result to the top margin of textview
and here's my code
ViewTreeObserver observer = binding.parentConstraint.getViewTreeObserver();
if (observer.isAlive()) {
observer.addOnGlobalLayoutListener(() -> {
DisplayMetrics displayMetrics = getContext().getResources().getDisplayMetrics();
float parentViewHeightInDP = (int) (binding.parentConstraint.getHeight() / displayMetrics.density);
if (getContext() != null) {
float heightInDP = displayMetrics.heightPixels / displayMetrics.density;
float distanceBetweenLayoutBottomAndParenBottom = heightInDP - parentViewHeightInDP;
if (distanceBetweenLayoutBottomAndParenBottom > 32) {
if (topMargin == 0) {
topMargin = 1;
ConstraintLayout.LayoutParams layoutParams = (ConstraintLayout.LayoutParams) binding.loginTextDontHaveAccount.getLayoutParams();
layoutParams.topMargin = Math.round(distanceBetweenLayoutBottomAndParenBottom);
Handler handler = new Handler();
handler.postDelayed(() -> {
binding.loginTextDontHaveAccount.requestLayout(); },
50);
}
}
but that the result I got
so my real question here is why there still some space here, I mean
the TextView should be exactly at the bottom

What I would suggest you to make NestedScrollView as a child instead of parent.
Make RelativeLayout as your parent and use layout_alignParentBottom to set TextView at bottom. Something like this.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:colorBackground"
android:clickable="true"
android:fillViewport="true"
android:focusable="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/img1"
android:layout_width="wrap_content"
android:layout_height="650dp"
android:background="#mipmap/ic_launcher" />
<ImageView
android:layout_width="match_parent"
android:layout_height="650dp"
android:layout_below="#+id/img1"
android:background="#color/colorPrimary" />
</LinearLayout>
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
</RelativeLayout>

Try this:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="vertical">
<AutoCompleteTextView
android:id="#+id/emailtext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:hint="Email"
android:inputType="textEmailAddress"
android:textColorHint="#80000000" />
<EditText
android:id="#+id/passwordtext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:hint="Password"
android:inputType="textPassword"
android:textColorHint="#80000000" />
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center">
<Button
android:id="#+id/enter"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Enter"
android:textAllCaps="false"
app:layout_constraintBottom_toTopOf="#id/textView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="This is my app"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/enter" />
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
You can use constraint layout. Pay attention to layout_constraintBottom_toTopOf button and layout_constraintTop_toBottomOf textview.

Why image dont instert in ImageView on API 21?

I try insert image on API 21 and that not working, but on API 26 everything working. Where my mistake or what is missing here?
public class MainActivity extends AppCompatActivity {
ImageView img1,img2,img3,img4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
img1 = (ImageView) findViewById(R.id.img1);
img2 = (ImageView) findViewById(R.id.img2);
img3 = (ImageView) findViewById(R.id.img3);
img4 = (ImageView) findViewById(R.id.img4);
//setResource
// if(img1 != null) img1.setImageResource(R.drawable.china); //Вылетает
//setDrawable
if(img2 != null) `img2.setImageDrawable(Drawable.createFromPath("/res/drawable/tokyo1.png"));`
//setBitmap
if(img3 != null) img3.setImageBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.tokyo2));
//Picasso(local)
if(img4 != null) {
Picasso.get()
.load(R.drawable.china)
.into(img4);
}
//Picasso(URI)
if(img1 != null) {
Picasso.get()
.load("https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTmG5K1tMdQ4W3G1WlZSfSWfL6jo8E9rS4NTHflXoT1CsF2Na_i")
.into(img1);
}
}
}
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="com.example.kiril.imgtest4.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/img1"
android:layout_width="1dp"
android:layout_height="150dp"
android:layout_weight="1"
android:background="#android:color/holo_orange_dark"/>
<ImageView
android:id="#+id/img2"
android:layout_width="1dp"
android:layout_height="150dp"
android:layout_weight="1"
android:background="#android:color/holo_blue_light"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/img3"
android:layout_width="1dp"
android:layout_height="150dp"
android:layout_weight="1"
android:background="#android:color/holo_green_light"/>
<ImageView
android:id="#+id/img4"
android:layout_width="1dp"
android:layout_height="150dp"
android:layout_weight="1"
android:background="#android:color/holo_red_dark"/>
</LinearLayout>
</LinearLayout>
</android.support.constraint.ConstraintLayout>

The problem is with the layout_width tag in your xml file.
You are specifying the layout_width size as 1 dp. Make it large enough to display the image in the ImageView
OR
use layout_width="wrap_content" to display the image properly without any adjustments in the width of the image.
So, in conclusion just replace the line android:layout_width="1dp" with android:layout_width="wrap_content" or android:layout_width="any size in dp"
Hope this helps !!

Ok Although i have no idea what you are trying to achieve here . I am pointing out some steps . Use Unit 0dp with layout_weight according to orientation.
So your layout should look like this.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/img1"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
/>
<ImageView
android:id="#+id/img2"
android:layout_width="0dp"
android:layout_height="150dp"
android:layout_weight="1"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/img3"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
/>
<ImageView
android:id="#+id/img4"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
/>
</LinearLayout>
</LinearLayout>
And you can set image to ImageView in several way.
imageView.setImageResource(R.drawable.ic_launcher);
imageView.setImageDrawable(ContextCompat.getDrawable(this,R.drawable.ic_launcher));
Picasso.with(context).load(R.drawable.ic_launcher).into(imageView);
Use android:scaleType attribute in xml for if you set image with src. Also no need to check if(img2 != null). Also read what-is-the-difference-between-src-and-background-of-imageview.

Android: Fatal Exception: java.lang.ClassCastException LayoutParams

Hey guys I am trying to display a custom message inside of my app but I keep getting this error while setting the padding to the layout programaticaly:
Fatal Exception:java.lang.ClassCastExceptionandroid.widget.RelativeLayout$LayoutParams cannot be cast to android.widget.FrameLayout$LayoutParams
Here is how I try to set the padding:
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
if(alignTop){
params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
int actionBarHeight = 0;
TypedValue tv = new TypedValue();
if (getContext().getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true))
{
actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data,getContext().getResources().getDisplayMetrics());
}
params.setMargins(0, actionBarHeight, 0,0);
}else{
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
}
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
params.addRule(RelativeLayout.ALIGN_PARENT_START);
MessageView.this.setLayoutParams(params);
And here is my XML file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:roboto="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#1e1e1e"
android:id="#+id/messageViewBackground"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:padding="10dp">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="#+id/messageViewSpinnerLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp">
<ImageView
android:id="#+id/messageViewSpinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/icon_spinner_small"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/icon_spinner_logo_small"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
<ImageView
android:id="#+id/messageViewIcon"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:src="#android:drawable/stat_sys_warning"
android:visibility="gone"/>
<com.myapp.widgets.RobotoText
android:id="#+id/messageViewText"
roboto:font="Light"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#5B5B5B"
android:layout_gravity="center_vertical" />
</LinearLayout>
</RelativeLayout>
What am I doing wrong?

Just a guess but if MessageView extends FrameLayout that's why the exception might be happening, and you don't need to add the params to MessageView.this, but to the RelativeLayout view, one of the 2 from your layout with id android:id="#+id/messageViewBackground" or android:id="#+id/messageViewSpinnerLayout"

android - Setting ScrollView height dynamically

I have a layout wich is nested like this:
<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:id="#+id/scrollAplicacoes"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin" >
<TextView
android:id="#+id/titulo"
android:layout_width="match_parent"
android:layout_height="60dp"
android:fontFamily="Arial"
android:lineSpacingExtra="-5dp"
android:text="#string/titulo_aplicacao"
android:textColor="#3c3c3c"
android:textSize="25sp"
android:textStyle="bold"/>
<ImageView
android:id="#+id/btnAplicacaoUm"
android:layout_width="match_parent"
android:layout_height="150dp"
android:onClick="selectAplicacao"
android:src="#drawable/aplicacoes_item1" />
<ImageView
android:id="#+id/btnAplicacaoDois"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_marginTop="10dp"
android:onClick="selectAplicacao"
android:src="#drawable/aplicacoes_item2" />
<ImageView
android:id="#+id/btnAplicacaoTres"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_marginTop="10dp"
android:onClick="selectAplicacao"
android:src="#drawable/aplicacoes_item3" />
</LinearLayout>
</ScrollView>
<LinearLayout
android:id="#+id/menuFixo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#drawable/faixa_below" >
<ImageView
android:id="#+id/belowHome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:contentDescription="#string/descBtnHome"
android:layout_marginTop="5dp"
android:src="#drawable/below_home_sel" />
<ImageView
android:id="#+id/belowCalculadora"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="abreCalculadora"
android:contentDescription="#string/descBtnCalculadora"
android:layout_marginTop="5dp"
android:src="#drawable/below_calc" />
<ImageView
android:id="#+id/belowProdutos"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/descFaixaProdutos"
android:layout_marginTop="5dp"
android:layout_weight="1"
android:src="#drawable/below_produtos" />
</LinearLayout>
</RelativeLayout>
The problem is that the LinearLayout outside the ScrollView, at the end is fixed on the bottom, and the scroll is placed behind it. So i need the Scroll to be the screen height minus this fixed LinerLayout height minus a little margin.
I tried this:
(...)
int scrollFInalHeight = scrollHeight - fixedMenuHeight - 10;
ViewGroup.LayoutParams param = new ViewGroup.LayoutParams(scrollStartWidth, scrollFInalHeight);
scroll.setLayoutParams(param);
But the app crashes when I start this activity.
This java code is within the public void onWindowFocusChanged(boolean hasFocus) method.
Any suggestions?
Thanks in advance! ;)

You need to set Height
scroll_view.setLayoutParams(new RelativeLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
or
scroll_view.setLayoutParams(new RelativeLayout.LayoutParams(
LayoutParams.FILL_PARENT, 350));

#aNikeT's answer is correct, but it will be safer with
ViewGroup.LayoutParams layoutParams = mDescriptionScrollView.getLayoutParams();
layoutParams.height = scrollViewHeight;

Have you tried to put
android:layout_above="#+id/menuFixo"
in your ScrollView?