Related
Hey I am working in android. I want to fit children in whole view of recyclerview android. I have horizontal recylerview. I will show what I want in diagram.
Scenario 1
when I have more item in recyclerview, I want to show children like this in my recycler view.
Expected Output
Scenario 2
when I have three item I want to show like this. It will fill whole view in reyclerview.
Expected Output
Scenario 3
When I have Two item in reyclerview, I need to look like this
Expected Output
The problem I am getting that I have 3 item, the view is not filling fully. Actually I want to stretch whole view to full width like Scenario 2.
Actual output
item_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:orientation="vertical">
<LinearLayout
android:id="#+id/container"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="#drawable/drawable_selector"
android:orientation="vertical">
<TextView
android:id="#+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="10dp" />
<TextView
android:id="#+id/subText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:layout_marginBottom="10dp" />
</LinearLayout>
<RelativeLayout
android:id="#+id/tagContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:visibility="gone">
<TextView
android:id="#+id/tagText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:paddingStart="10dp"
android:paddingEnd="10dp" />
</RelativeLayout>
</FrameLayout>
UPDATE
after #Cheticamp suggestion I did this code
companion object {
fun bindView(parent: ViewGroup): XYZViewHolder {
val view = XyzLayoutBinding.inflate(
LayoutInflater.from(parent.context),
parent,
false
)
val lp = view.container.layoutParams
lp.width = parent.measuredWidth / 3
return OptionsViewHolder(
view
)
}
}
As you can see my last item is cut from the end.
I think in my framelayout i Used marginEnd 10 dp is it causing issue? please refer my layout if you need more. And one more thing I didn't divide framelayout instead I take linear layout as container. I am adding my github link.
You can change the width of the RecyclerView item views in onCreateViewHolder(). The ViewGroup parent is the RecyclerView.
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.item_view, parent, false)
val lp = view.layoutParams
// Change the width of the item view here
lp.width = parent.measuredWidth / 3 // width is 1/3 of the width of the RecyclerView
return ItemViewHolder(view)
}
Customize frameLayout class
make a class inherit FrameLayout or another layout you use.
public class SquareFrameLayout extends FrameLayout {
public SquareFrameLayout(#NonNull Context context) {
super(context);
}
public SquareFrameLayout(#NonNull Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public SquareFrameLayout(#NonNull Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public SquareFrameLayout(#NonNull Context context, #Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
}
onMeasure method is important.
then change root layout item recyclerView to SquareFrameLayout (The class built now)
like this:
<com.example.app.SquareFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/background_rv_item"
android:orientation="vertical"
android:padding="16dp"
android:layout_margin="4dp"
xmlns:tools="http://schemas.android.com/tools">
//your items
</com.example.app.SquareFrameLayout>
You can use flexbox-layout library provided by Google.
You can adjust the items according to your need.
Download the app and see this demo working for you or not. https://github.com/google/flexbox-layout
I'm trying to dynamically add a view to a LinearLayout using the wrap_content height. However it doesn't work unless I add a defined dp height such as 300dp. Why can't I programmatically add the View and having the Parent LinearLayout wrap the contents?
The view I'm trying to add:
public class ImageCanvas extends View {
private static final String TAG = "ImageCanvas";
private Bitmap icon;
public ImageCanvas(Context context) {
super(context);
Drawable drawable = ContextCompat.getDrawable(context, R.drawable.piggy);
if(drawable != null){
icon = ((BitmapDrawable) drawable).getBitmap();
}
Log.d(TAG, "ImageCanvas: " + icon);
}
public ImageCanvas(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public ImageCanvas(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(icon, 0, 0, null);
}
}
The LinearLayout I'm trying to add the above view to:
<LinearLayout
android:id="#+id/drawingPad"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="#+id/btn_create_image"
app:layout_constraintBottom_toBottomOf="parent"
android:paddingBottom="32dp"
android:orientation="vertical"
android:paddingTop="32dp"/>
Creating the view programmatically and adding it:
LinearLayout drawingPad = findViewById(R.id.drawingPad);
ImageCanvas imageCanvas = new ImageCanvas(context);
drawingPad.addView(imageCanvas);
It works when I set the XML LinearLayout to a defined height like 200dp but it doesn't work with wrap_content, how can I get it to do so with wrap_content?
_________________________________________________________
Update 1:
I simplified everything down to the XML layout and the issue turned out to be a Parent NestedScrollView.
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView 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">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/parentLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="#+id/btn_create_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:text="Create image"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<LinearLayout
android:id="#+id/drawingPad"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingTop="32dp"
android:paddingBottom="32dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#+id/btn_create_image" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
This is the entire layout. When you add a NestedScrollView and you try to add a view programmatically, the Bitmap WILL NOT draw on screen. When you remove the NestedScrollView the Bitmap will appear. If anyone knows how to do it with a NestedScrollView please share!
You need to provide measurements of ImageCanvas with an onMeasure() override:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(icon.getWidth(),icon.getHeight());
}
See Custom View Components.
When you explicitly supply a height, that height is set in the custom component. With wrap content, the height gets set to zero since it is neither specified nor explicitly measured. The above code will provide the correct measurements.
(icon.getHeight() is what you really need and corresponds to wrap_content. You may need a different value for icon.getWidth() depending upon your design.)
Not sure why a NestedScrollView has any effect, but the code above will help.
The problem may lay with your constraint layout.
for constraint layout >= 1.1
app:layout_constrainedHeight=”true"
android:layout_height="wrap_content"
for constraint layout <1.1
android:layout_height="wrap_content"
app:layout_constraintHeight_default="wrap"
This always gets me maybe it got you.
(edit) this needs to be in the child of the constraint layout not the constraint layout itself, ie LinearLayout.
I try to make a grid-layout with square images. I thought that it must be possible to manipulate the GridLayoutManager by manipulating onMeasure to do a
super.onMeasure(recycler, state, widthSpec, widthSpec);
instead of
super.onMeasure(recycler, state, widthSpec, heightSpec);
but unfortunately, that didn't work.
Any ideas?
To have the square elements in my RecyclerView, I provide a simple wrapper for my root View element; I use the following SquareRelativeLayout in place of RelativeLayout.
package net.simplyadvanced.widget;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;
/** A RelativeLayout that will always be square -- same width and height,
* where the height is based off the width. */
public class SquareRelativeLayout extends RelativeLayout {
public SquareRelativeLayout(Context context) {
super(context);
}
public SquareRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SquareRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#TargetApi(VERSION_CODES.LOLLIPOP)
public SquareRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Set a square layout.
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
}
Then, in my XML layout for the adapter, I've just referenced the custom view as shown in the following. Though, you can do this programmatically also.
<?xml version="1.0" encoding="utf-8"?>
<net.simplyadvanced.widget.SquareRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/elementRootView"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<!-- More widgets here. -->
</net.simplyadvanced.widget.SquareRelativeLayout>
Note: Depending on which orientation your grid is, then you may want to have the width based off of height (GridLayoutManager.HORIZONTAL) instead of the height being based off the width (GridLayoutManager.VERTICAL).
Constraint layout solves this problem. Use app:layout_constraintDimensionRatio="H,1:1"
recyclerview_grid_layout.xml
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<ImageView
android:id="#+id/imageview"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintDimensionRatio="H,1:1"
android:scaleType="centerCrop"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>
EDIT
Set ImageView width to 0dp. match_parent is now deprecated for ConstraintLayout.
In case someone would like to scale the view differently - this is how you do it:
private static final double WIDTH_RATIO = 3;
private static final double HEIGHT_RATIO = 4;
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = (int) (HEIGHT_RATIO / WIDTH_RATIO * widthSize);
int newHeightSpec = MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, newHeightSpec);
}
Starting API 26 (Support Library 26.0), one can use ConstraintLayout that exposes aspect ratio property to force views to be squared:
https://developer.android.com/training/constraint-layout/index.htm
android {
compileSdkVersion 26
buildToolsVersion '26.0.2'
...
}
...
dependencies {
compile 'com.android.support:appcompat-v7:26.0.2'
compile 'com.android.support.constraint:constraint-layout:1.1.0-beta1' //use whatever version is current
}
Example of layout I'm using in GridLayoutManager:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="#dimen/margin_small"
android:background="#drawable/border_gray"
android:gravity="center">
<android.support.constraint.ConstraintLayout
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintDimensionRatio="h,1:1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<!-- place your content here -->
</android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
app:layout_constraintDimensionRatio="h,1:1" is the key attribute here
A small update for ConstraintLayout for androidx.
Include this line to your build.gradle:
implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2'
I wanted to get a RecycleView with GridLayoutManager with square CardViews and I used such a layout for items:
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
>
<androidx.cardview.widget.CardView
android:id="#+id/cardView"
android:layout_width="0dp"
android:layout_height="0dp"
card_view:cardElevation="4dp"
app:layout_constraintDimensionRatio="H,1:1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
>
On the ConstraintLayout
layout_width="match_parent" is important to let the item fill as much space as RecyclerView provides
layout_height="wrap_content" do not let the item to fill all the height given by RecyclerView, but use the constrained height, provided by ConstraintLayout. In my case, when I used FrameLayout or LinearLayout, the items were "tall".
On the child node, in my case CardView
limiting size to zero is important: layout_width="0dp" and layout_height="0dp" it means, that width and height are contrained
layout_constraintDimensionRatio="H,1:1" makes the desired effect, by setting H you define that height is to be constrained 1:1 is the ratio.
See some detailed explanations on the offsite.
Please, try this extension of the FrameLayout. It performs double measuring to improve consistency. It also supports custom XML properties to set-up required aspect ration from layouts
public class StableAspectFrameLayout extends FrameLayout {
private int aspectWidth = 1;
private int aspectHeight = 1;
public StableAspectFrameLayout(Context context) {
this(context, null, 0);
}
public StableAspectFrameLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public StableAspectFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
extractCustomAttrs(context, attrs);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public StableAspectFrameLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
extractCustomAttrs(context, attrs);
}
private void extractCustomAttrs(Context context, AttributeSet attrs) {
if (attrs == null) return;
TypedArray a = context.getResources().obtainAttributes(attrs, R.styleable.StableAspectFrameLayout);
try {
aspectWidth = a.getInteger(R.styleable.StableAspectFrameLayout_aspect_width, 1);
aspectHeight = a.getInteger(R.styleable.StableAspectFrameLayout_aspect_height, 1);
} finally {
a.recycle();
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int newSpecWidth = MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY);
int newH = Math.round(((float) getMeasuredWidth()) * aspectHeight / aspectWidth);
int newSpecHeigh = MeasureSpec.makeMeasureSpec(newH, MeasureSpec.EXACTLY);
super.onMeasure(newSpecWidth, newSpecHeigh);
}
}
And the content fo the attrs.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- StableAspectFrameLayout -->
<declare-styleable name="StableAspectFrameLayout">
<attr name="aspect_width" format="integer"/>
<attr name="aspect_height" format="integer"/>
</declare-styleable>
</resources>
Once again, I recommend the relatively recent 'percent' layouts. Using the dependency 'com.android.support:percent:25.2.0', you can do something like this:
<android.support.percent.PercentFrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/image"
app:layout_widthPercent="100%"
app:layout_aspectRatio="100%"
android:padding="10dp"
android:scaleType="centerCrop"
android:cropToPadding="true"
tools:background="#efdbed"
/>
</android.support.percent.PercentFrameLayout>
It's probably much faster than ConstraintLayout, though someday we probably won't care anymore.
I don't like chosen answer so let me provide mine: Instead of wrapping entire item layout in SomeDammyLayoutWithFixedAspectRatio you can hack GridLayoutManager and rewrite code inside measureChild. I've replaced these lines:
if (mOrientation == VERTICAL) {
wSpec = getChildMeasureSpec(availableSpaceInOther, otherDirParentSpecMode,
horizontalInsets, lp.width, false);
hSpec = getChildMeasureSpec(mOrientationHelper.getTotalSpace(), getHeightMode(),
verticalInsets, lp.height, true);
} else {
hSpec = getChildMeasureSpec(availableSpaceInOther, otherDirParentSpecMode,
verticalInsets, lp.height, false);
wSpec = getChildMeasureSpec(mOrientationHelper.getTotalSpace(), getWidthMode(),
horizontalInsets, lp.width, true);
}
to:
if (mOrientation == VERTICAL) {
wSpec = getChildMeasureSpec(availableSpaceInOther, otherDirParentSpecMode,
horizontalInsets, lp.width, false);
hSpec = wSpec;
} else {
hSpec = getChildMeasureSpec(availableSpaceInOther, otherDirParentSpecMode,
verticalInsets, lp.height, false);
wSpec = hSpec;
}
It seems to work fine.
Don't get me wrong, this is quite messy too, but at least this solution doesn't hurt app performance by extending view hierarchy
I had similar problem and I had to inflate the view which would be square in Grid of recycler view. Below is my way of doing it.
Inside onCreateViewHolder method I used the ViewTreeObserver and GlobalLayoutListener to get the measured width of the layout. The layout has match_parent value in the width attribute. Any my recycler view has layout in center horizontal.
final View view = LayoutInflater.from(mActivity).inflate(R.layout.list_item_deals, parent, false);
view.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
int side = view.getMeasuredWidth();
ViewGroup.LayoutParams lp = view.getLayoutParams();
lp.width = side;
lp.height = side;
view.setLayoutParams(lp);
}
});
reference image
I have defined a custom relative layout to force a square view in my layout. But I am having trouble centering the children in that relative layout.
My custom RelativeLayout is defined as follows:
public class SquareView extends RelativeLayout {
public SquareView(Context context) {
super(context);
}
public SquareView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SquareView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int size;
size = Math.min(widthSize, heightSize);
setMeasuredDimension(size, size);
int finalMeasureSpec = MeasureSpec.makeMeasureSpec(size, MeasureSpec.EXACTLY);
super.onMeasure(finalMeasureSpec, finalMeasureSpec);
}
}
and my xml is as follows:
<com.mypackage.SquareView
android:id="#+id/gameboard_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:padding="0dp" >
<LinearLayout
android:id="#+id/gameboard"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:background="#drawable/xmlgameboard"
android:gravity="center_horizontal"
android:orientation="vertical" >
</LinearLayout>
</com.mypackage.SquareView>
When I view the xml file in graphical view I see the SquareView (gameboard_container) filling all available space (not square), but the child LinearLayout (gameboard) is square.
However, the child LinearLayout (gameboard) is also left justified, where as I require it to be centered.
How would I fix this?
Thank you.
After 3 days of struggling with this I've managed to solve it. The solution was to simply nest my SquareView inside a frame layout. Then I could centre the SquareView using
android:layout_gravity="center_horizontal"
View's have a minHeight but somehow are lacking a maxHeight:
What I'm trying to achieve is having some items (views) filling up a ScrollView. When there are 1..3 items I want to display them directly. Meaning the ScrollView has the height of either 1, 2 or 3 items.
When there are 4 or more items I want the ScrollView to stop expanding (thus a maxHeight) and start providing scrolling.
However, there is unfortunately no way to set a maxHeight. So I probably have to set my ScrollView height programmatically to either WRAP_CONTENT when there are 1..3 items and set the height to 3*sizeOf(View) when there are 4 or more items.
Can anyone explain why there is no maxHeight provided, when there is already a minHeight?
(BTW: some views, like ImageView have a maxHeight implemented.)
None of these solutions worked for what I needed which was a ScrollView set to wrap_content but having a maxHeight so it would stop expanding after a certain point and start scrolling. I just simply overrode the onMeasure method in ScrollView.
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(300, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
This might not work in all situations, but it certainly gives me the results needed for my layout. And it also addresses the comment by madhu.
If some layout present below the scrollview then this trick wont work – madhu Mar 5 at 4:36
In order to create a ScrollView or ListView with a maxHeight you just need to create a Transparent LinearLayout around it with a height of what you want the maxHeight to be. You then set the ScrollView's Height to wrap_content. This creates a ScrollView that appears to grow until its height is equal to the parent LinearLayout.
This worked for me to make it customizable in xml:
MaxHeightScrollView.java:
public class MaxHeightScrollView extends ScrollView {
private int maxHeight;
private final int defaultHeight = 200;
public MaxHeightScrollView(Context context) {
super(context);
}
public MaxHeightScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
if (!isInEditMode()) {
init(context, attrs);
}
}
public MaxHeightScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
if (!isInEditMode()) {
init(context, attrs);
}
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public MaxHeightScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
if (!isInEditMode()) {
init(context, attrs);
}
}
private void init(Context context, AttributeSet attrs) {
if (attrs != null) {
TypedArray styledAttrs = context.obtainStyledAttributes(attrs, R.styleable.MaxHeightScrollView);
//200 is a defualt value
maxHeight = styledAttrs.getDimensionPixelSize(R.styleable.MaxHeightScrollView_maxHeight, defaultHeight);
styledAttrs.recycle();
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
attr.xml
<declare-styleable name="MaxHeightScrollView">
<attr name="maxHeight" format="dimension" />
</declare-styleable>
example layout
<blah.blah.MaxHeightScrollView android:layout_weight="1"
app:maxHeight="90dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<EditText android:id="#+id/commentField"
android:hint="Say Something"
android:background="#FFFFFF"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:gravity="center_vertical"
android:maxLines="500"
android:minHeight="36dp"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</blah.blah.MaxHeightScrollView>
(I know this does not directly answer the question but might be helpful to others looking for maxHeight functionality)
ConstraintLayout offers maximum height for its children via
app:layout_constraintHeight_max="300dp"
app:layout_constrainedHeight="true"
or
app:layout_constraintWidth_max="300dp"
app:layout_constrainedWidth="true"
Sample usage here.
I would have commented on whizzle's answer if I could, but thought it useful to note that in order for me to solve this problem in the context of multi-window mode in Android N, I needed to change the code slightly to this:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if(MeasureSpec.getSize(heightMeasureSpec) > maxHeight) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
This allows for the layout to resize to be smaller than the max height, but also prevent it from being larger than the max height. I used this is a layout class that Overrides RelativeLayout and this allowed me to create a custom dialog with a ScrollView as the child of MaxHeightRelativeLayout that does not expand the full height of the screen and also shrinks to fit within the smallest widow size in multi-window for Android N.
As mentioned above, ConstraintLayout offers maximum height for its children via:
app:layout_constraintHeight_max="300dp"
app:layout_constrainedHeight="true"
Besides, if maximum height for one ConstraintLayout's child is uncertain until App running, there still has a way to make this child automatically adapt a mutable height no matter where it was placed in the vertical chain.
For example, we need to show a bottom dialog with a mutable header TextView, a mutable ScrollView and a mutable footer TextView. The dialog's max height is 320dp，when total height not reach 320dp ScrollView act as wrap_content, when total height exceed ScrollView act as "maxHeight=320dp - header height - footer height".
We can achieve this just through xml layout file:
<?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="320dp">
<TextView
android:id="#+id/tv_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/black_10"
android:gravity="center"
android:padding="10dp"
app:layout_constraintBottom_toTopOf="#id/scroll_view"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1"
app:layout_constraintVertical_chainStyle="packed"
tools:text="header" />
<ScrollView
android:id="#+id/scroll_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/black_30"
app:layout_constrainedHeight="true"
app:layout_constraintBottom_toTopOf="#id/tv_footer"
app:layout_constraintHeight_max="300dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/tv_header">
<LinearLayout
android:id="#+id/ll_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/tv_sub1"
android:layout_width="match_parent"
android:layout_height="160dp"
android:gravity="center"
android:textColor="#color/orange_light"
tools:text="sub1" />
<TextView
android:id="#+id/tv_sub2"
android:layout_width="match_parent"
android:layout_height="160dp"
android:gravity="center"
android:textColor="#color/orange_light"
tools:text="sub2" />
</LinearLayout>
</ScrollView>
<TextView
android:id="#+id/tv_footer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/black_50"
android:gravity="center"
android:padding="10dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/scroll_view"
tools:text="footer" />
</android.support.constraint.ConstraintLayout>
Most import code is short:
app:layout_constraintVertical_bias="1"
app:layout_constraintVertical_chainStyle="packed"
app:layout_constrainedHeight="true"
Horizontal maxWidth usage is quite the same.
There is no way to set maxHeight. But you can set the Height.
To do that you will need to discovery the height of each item of you scrollView. After that just set your scrollView height to numberOfItens * heightOfItem.
To discovery the height of an item do that:
View item = adapter.getView(0, null, scrollView);
item.measure(0, 0);
int heightOfItem = item.getMeasuredHeight();
To set the height do that:
// if the scrollView already has a layoutParams:
scrollView.getLayoutParams().height = heightOfItem * numberOfItens;
// or
// if the layoutParams is null, then create a new one.
scrollView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, heightOfItem * numberOfItens));
Wrap your ScrollView around your a plainLinearLayout with layout_height="max_height", this will do a perfect job. In fact, I have this code in production from last 5 years with zero issues.
<LinearLayout
android:id="#+id/subsParent"
android:layout_width="match_parent"
android:layout_height="150dp"
android:gravity="bottom|center_horizontal"
android:orientation="vertical">
<ScrollView
android:id="#+id/subsScroll"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginEnd="15dp"
android:layout_marginStart="15dp">
<TextView
android:id="#+id/subsTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/longText"
android:visibility="visible" />
</ScrollView>
</LinearLayout>
My MaxHeightScrollView custom view
public class MaxHeightScrollView extends ScrollView {
private int maxHeight;
public MaxHeightScrollView(Context context) {
this(context, null);
}
public MaxHeightScrollView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public MaxHeightScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
TypedArray styledAttrs =
context.obtainStyledAttributes(attrs, R.styleable.MaxHeightScrollView);
try {
maxHeight = styledAttrs.getDimensionPixelSize(R.styleable.MaxHeightScrollView_mhs_maxHeight, 0);
} finally {
styledAttrs.recycle();
}
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (maxHeight > 0) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
style.xml
<declare-styleable name="MaxHeightScrollView">
<attr name="mhs_maxHeight" format="dimension" />
</declare-styleable>
Using
<....MaxHeightScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:mhs_maxHeight="100dp"
>
...
</....MaxHeightScrollView>
I have an answer here:
https://stackoverflow.com/a/29178364/1148784
Just create a new class extending ScrollView and override it's onMeasure method.
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (maxHeight > 0){
int hSize = MeasureSpec.getSize(heightMeasureSpec);
int hMode = MeasureSpec.getMode(heightMeasureSpec);
switch (hMode){
case MeasureSpec.AT_MOST:
heightMeasureSpec = MeasureSpec.makeMeasureSpec(Math.min(hSize, maxHeight), MeasureSpec.AT_MOST);
break;
case MeasureSpec.UNSPECIFIED:
heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
break;
case MeasureSpec.EXACTLY:
heightMeasureSpec = MeasureSpec.makeMeasureSpec(Math.min(hSize, maxHeight), MeasureSpec.EXACTLY);
break;
}
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
In case anyone needs it:
app:layout_constraintHeight_max="300dp"
It forces the View (that is inside a ConstraintLayout) to be 300dp as a max height. For those who want to do this programmatically, it goes like this:
val totalScreenHeight = displayMetrics.heightPixels
val layoutParams: ConstraintLayout.LayoutParams = viewThatIsInsideAConstraintLayout.layoutParams as ConstraintLayout.LayoutParams
layoutParams.matchConstraintMaxHeight = totalScreenHeight/2
viewThatIsInsideAConstraintLayout.layoutParams = layoutParams
Have you tried using the layout_weight value? If you set one it to a value greater than 0, it will stretch that view into the remaining space available.
If you had multiple views that needed to be stretched, then the value will become a weight between them.
So if you had two views both set to a layout_weight value of 1, then they would both stretch to fill in the space but they would both stretch to an equal amount of space. If you set one of them to the value of 2, then it would stretch twice as much as the other view.
Some more info here listed under Linear Layout.
i think u can set the heiht at runtime for 1 item just scrollView.setHeight(200px), for 2 items scrollView.setheight(400px) for 3 or more scrollView.setHeight(600px)
As we know devices running android can have different screen sizes. As we further know views should adjust dynamically and become the space which is appropriate.
If you set a max height you maybe force the view not to get enough space or take to less space. I know that sometimes it seems to be practically to set a max height. But if the resolution will ever change dramatically, and it will!, then the view, which has a max height, will look not appropriate.
i think there is no proper way to exactly do the layout you want. i would recommend you to think over your layout using layout managers and relative mechanisms. i don't know what you're trying to achieve but it sounds a little strange for me that a list should only show three items and then the user has to scroll.
btw. minHeight is not guaranteed (and maybe shouldn't exist either). it can have some benefit to force items to be visible while other relative items get smaller.
If anyone is considering using exact value for LayoutParams e.g.
setLayoutParams(new LayoutParams(Y, X );
Do remember to take into account the density of the device display otherwise you might get very odd behaviour on different devices. E.g:
Display display = getWindowManager().getDefaultDisplay();
DisplayMetrics d = new DisplayMetrics();
display.getMetrics(d);
setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, (int)(50*d.density) ));
First get the item height in pixels
View rowItem = adapter.getView(0, null, scrollView);
rowItem.measure(0, 0);
int heightOfItem = rowItem.getMeasuredHeight();
then simply
Display display = getWindowManager().getDefaultDisplay();
DisplayMetrics displayMetrics = new DisplayMetrics();
display.getMetrics(displayMetrics);
scrollView.getLayoutParams().height = (int)((heightOfItem * 3)*displayMetrics .density);
if you guys want to make a non-overflow scrollview or listview, just but it on a RelativeLayout with a topview and bottomview on top and bottom for it:
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/topview"
android:layout_below="#+id/bottomview" >
I used a custom ScrollView made in Kotlin which uses maxHeight. Example of use:
<com.antena3.atresplayer.tv.ui.widget.ScrollViewWithMaxHeight
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxHeight="100dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</com.antena3.atresplayer.tv.ui.widget.ScrollViewWithMaxHeight>
Here is the code of ScrollViewWidthMaxHeight:
import android.content.Context
import android.util.AttributeSet
import android.widget.ScrollView
import timber.log.Timber
class ScrollViewWithMaxHeight #JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0
) : ScrollView(context, attrs, defStyleAttr) {
companion object {
var WITHOUT_MAX_HEIGHT_VALUE = -1
}
private var maxHeight = WITHOUT_MAX_HEIGHT_VALUE
init {
val a = context.obtainStyledAttributes(
attrs, R.styleable.ScrollViewWithMaxHeight,
defStyleAttr, 0
)
try {
maxHeight = a.getDimension(
R.styleable.ScrollViewWithMaxHeight_android_maxHeight,
WITHOUT_MAX_HEIGHT_VALUE.toFloat()
).toInt()
} finally {
a.recycle()
}
}
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
var heightMeasure = heightMeasureSpec
try {
var heightSize = MeasureSpec.getSize(heightMeasureSpec)
if (maxHeight != WITHOUT_MAX_HEIGHT_VALUE) {
heightSize = maxHeight
heightMeasure = MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.AT_MOST)
} else {
heightMeasure = MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.UNSPECIFIED)
}
layoutParams.height = heightSize
} catch (e: Exception) {
Timber.e(e, "Error forcing height")
} finally {
super.onMeasure(widthMeasureSpec, heightMeasure)
}
}
fun setMaxHeight(maxHeight: Int) {
this.maxHeight = maxHeight
}
}
which needs also this declaration in values/attrs.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="ScrollViewWithMaxHeight">
<attr name="android:maxHeight" />
</declare-styleable>
</resources>