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I build customView extending LinearLayout and having simple 3 childrens(2 TextView and ImageView). I create this view dynamically in code and adding it to parent LinearLayout. This view has background, so I can easily spot on the screen, that it is inflated correctly in its place, but any of child is not visible. I checked LayoutInspector and it shows that everything is setted correctly(text values to TextViews and picture to ImageView), but somehow when I try to locate them on inspector they are shown as little dot over my customView:
My CustomView is called DayTileView and this is square with gray background. As you can see on inspector on the left childrens are filled with content. Layout of View:
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<merge>
<TextView
android:id="#+id/day"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textColor="#android:color/white"
/>
<TextView
android:id="#+id/dayName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textColor="#android:color/white"
/>
<ImageView
android:id="#+id/padlock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:src="#drawable/ic_padlock"
/>
</merge>
</layout>
And its code:
public class DayTileView extends LinearLayout {
private DayTileBinding mBinding;
public DayTileView(Context context) {
super(context);
init();
}
public DayTileView(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public DayTileView(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mBinding = DataBindingUtil.inflate(LayoutInflater.from(getContext()), R.layout.day_tile, this, true);
setOrientation(VERTICAL);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
setMeasuredDimension(width, width);
}
public void setDay(int day, int month, int year) {
DateTime settedDay = new DateTime().withYear(year).withMonthOfYear(month).withDayOfMonth(day);
mBinding.day.setText(String.valueOf(day));
String dayName = settedDay.dayOfWeek().getAsText();
mBinding.dayName.setText(dayName);
boolean isWeekend = settedDay.dayOfWeek().get() == 6 || settedDay.dayOfWeek().get() == 7;
setBackgroundColor(ContextCompat.getColor(getContext(), isWeekend ? R.color.weekend_bg : R.color.weekday_bg));
}
}
Its use in another CustomView which is also LinearLayout but wiht horizontal orientation (PlannedDayView on inspector):
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<merge>
<*.customViews.DayTileView
android:id="#+id/dayTile"
android:layout_width="0dp"
android:layout_weight="0.2"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="#+id/container"
android:orientation="vertical"
android:layout_weight="1.2"
android:layout_width="0dp"
android:layout_height="wrap_content"/>
</merge>
</layout>
Has anyone any idea what could be casuing this (childs out of view)? When I replace merge for LinearLayout with vertical orientation and same background everything in Design mode of layout is visible correctly, so it should work.
EDIT:
I found out, that if I set during View initalization Padding Top to 10px then dot is moving down. So it looks like from some reasons Android didn't made to inflate correctly TextViews and ImageView
I found out what was the problem:
I overrided onMeasure and didn't measure child Views. Earlier I was using such code to make square View not square ViewGroup.
Corrected code:
final int width = getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec);
setMeasuredDimension(width, width);
super.onMeasure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY));
After setting correct width and height for View I must measure whole view with new MeasureSpec
My problem is, when i turn on a setting in the developer options to see view bounds, i can see that the orange "20" text wraps much larger space than it is requried. (top and bottom)
I tried to set: android:includeFontPadding="false" but it is just simple push up the content, leaving a big empty space bottom of the text's container.
How can i remove the extra space?
XML:
<LinearLayout
android:id="#+id/topDash"
android:layout_width="180dp"
android:layout_height="180dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="#drawable/circle_gray"
android:orientation="vertical" >
<TextView
android:id="#+id/RobotoTextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/sog_C"
android:textColor="#color/blue_medium"
android:textSize="20sp" />
<TextView
android:id="#+id/RobotoTextView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="20"
android:textColor="#color/orange"
android:textSize="100sp" />
<TextView
android:id="#+id/robotoTextView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="KM/H"
android:textColor="#color/gray_darker"
android:textSize="24sp" />
</LinearLayout>
Very nice question. I'm not sure that it possible to do it only in XML and without setting any hard coded value for scrollY property, but I implemented a small custom class without hard coded values, which you can use without any modifications in other places. In such situations onMeasure method always come to help :) I use default font here. If you use different typeface, call textPaint.setTypeface() and set it before textPaint.getTextBounds statement.
public class CustomTextView extends TextView {
private int newWidth;
private int newHeight;
public CustomTextView(Context context) {
super(context);
}
public CustomTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if(newHeight == 0) {
Rect textBounds = new Rect();
Paint textPaint = new Paint();
textPaint.setTextSize(getTextSize());
textPaint.getTextBounds(getText().toString(), 0, getText().length(), textBounds);
int descent = (int) textPaint.descent();
newWidth = textBounds.width();
newHeight = textBounds.height() - 2 * descent;
setScrollY(descent);
}
setMeasuredDimension(newWidth, newHeight);
}
}
But this solution is only good for numbers, why only for numbers, because of descent, and that's why we cant remove that extra space ony inside the XML, it is a font property
This is my layout file
<LinearLayout ...
<ImageView
android:id="#+id/feed_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:adjustViewBounds="true"
android:contentDescription="#string/image_content_description" />
But ImageView width does not match parent width. (width is image source width)
Image Source loaded Lazy-loading from url.
How to scale the width of image view regadless image source ?
I want
Width = match(or fill) parent.
Height = auto-scaled
You can achieve this in two ways:
If your image is larger than the ImageView you can use xml only
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitCenter"
android:adjustViewBounds="true"/>
If your image is smaller than the ImageView
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:adjustViewBounds="true"/>
With the second option you have to measure the width and height of the image and set the height of the ImageView in your code, according to the actual width of the image view (same ratio).
You can use android:scaletype="fitXY" property of imageview
2.default Android will scale your image down to fit the ImageView, maintaining the aspect ratio. However, make sure you're setting the image to the ImageView using android:src="..." rather than android:background="...". src= makes it scale the image maintaining aspect ratio, but background= makes it scale and distort the image to make it fit exactly to the size of the ImageView. (You can use a background and a source at the same time though, which can be useful for things like displaying a frame around the main image, using just one ImageView.)
If you want to fit the image in view use android:scaleType="fitXY"
You can achieve this with this, create new AspectRatioImageView that extends imageView:
public class AspectRatioImageView extends ImageView {
public AspectRatioImageView(Context context) {
super(context);
}
public AspectRatioImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public AspectRatioImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Drawable drw = getDrawable();
if (null == drw || drw.getIntrinsicWidth() <= 0) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
} else {
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = width * drw.getIntrinsicHeight() / drw.getIntrinsicWidth();
setMeasuredDimension(width, height);
}
}
}
And then in your layout xml use :
<my.app.AspectRatioImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/ar_imageview"/>
<ImageView
android:id="#+id/idImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"/>
calculate the height according to the aspect ratio that you want
Display display = getActivity().getWindowManager().getDefaultDisplay();
int height = (display.getWidth() * 9) /16; // in this case aspect ratio 16:9
ImageView image = (ImageView) findViewById(R.id.idImage);
image.getLayoutParams().height = height;
I have a vertical LinearLayout with two TextView inside it. The former contains a static text property (it's text never change) and the last contains a regressive timer. The image below shows both items:
I want to eliminate the blank space that both texts have both top and bottom. I've tried several approaches...
android:includeFontPadding="false"
android:lineSpacingMultiplier="1"
android:lineSpacingExtra="0dp"
android:paddingTop="0dp"
android:paddingBottom="0dp"
android:layout_marginTop="0dp"
android:layout_marginBottom="0dp"
...but none of them removed the space above the text. How can I make both texts close to each other without any extra space?
PS: I've found this similar question, but no one answered it.
Full layout code:
<LinearLayout
android:id="#+id/boxTime"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp" >
<TextView
android:id="#+id/textRemainingTime2"
android:layout_width="wrap_content"
android:layout_heigh="wrap_content"
android:layout_gravity="center"
android:gravity="center_horizontal"
android:textSize="70sp"
android:includeFontPadding="false"
android:lineSpacingMultiplier="1"
android:lineSpacingExtra="0dp"
android:paddingTop="0dp"
android:paddingBottom="0dp"
android:layout_marginTop="0dp"
android:layout_marginBottom="0dp"
android:text="#string/title" />
<TextView
android:id="#+id/textRemainingTime"
android:layout_width="wrap_content"
android:layout_heigh="wrap_content"
android:layout_gravity="center"
android:gravity="center_horizontal"
android:includeFontPadding="false"
android:lineSpacingMultiplier="1"
android:lineSpacingExtra="0dp"
android:paddingTop="0dp"
android:paddingBottom="0dp"
android:layout_marginTop="0dp"
android:layout_marginBottom="0dp"
android:textSize="107sp"
android:text="#string/timer" />
</LinearLayout>
Try using negative margins. It may take a bit of playing with the numbers to get it right, but I've done it before and it worked out well.
android:layout_marginTop="-5dp"
By default, a TextView includes some padding to leave space for accent characters. You can turn that off with:
android:includeFontPadding="false"
or
textView.setIncludeFontPadding(false)
Make baseline of the text equal to the bottom of the TextView.
public class BaselineTextView extends TextView {
public BaselineTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
#Override
protected void onDraw(Canvas canvas) {
int yOffset = getHeight() - getBaseline();
canvas.translate(0, yOffset);
super.onDraw(canvas);
}
}
NOTE: To avoid chopping off descenders call setClipChildren(false) on your TextView's parent ViewGroup (android:clipChildren="false" in XML).
If you set includeFontPadding to false it helps.
android:includeFontPadding="false"
but if you know you don't have any descenders because you set
android:textAllCaps="true"
or you know there are no characters which have descender, you can make a custom TextView and set the height to the baseline.
public class ExTextView extends TextView {
public ExTextView(Context context) {
this(context, null);
}
public ExTextView(Context context, #Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public ExTextView(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public ExTextView(Context context, #Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void onDraw(Canvas canvas) {
setHeight(getBaseline()); // <--- Shrink size to baseline
super.onDraw(canvas);
}
}
The source code is included in my UiComponents test app.
https://github.com/landenlabs/UiComponents
Just use below, nothing else required.
android:includeFontPadding="false"
if you want some variations in line gap then use :
android:lineSpacingExtra
negative margins will do the trick
Since my requirement is override the existing textView get from findViewById(getResources().getIdentifier("xxx", "id", "android"));, so I can't simply try onDraw() of other answer.
But I just figure out the correct steps to fixed my problem, here is the final result from Layout Inspector:
Since what I wanted is merely remove the top spaces, so I don't have to choose other font to remove bottom spaces.
Here is the critical code to fixed it:
Typeface mfont = Typeface.createFromAsset(getResources().getAssets(), "fonts/myCustomFont.otf");
myTextView.setTypeface(mfont);
myTextView.setPadding(0, 0, 0, 0);
myTextView.setIncludeFontPadding(false);
The first key is set custom font "fonts/myCustomFont.otf" which has the space on bottom but not on the top, you can easily figure out this by open otf file and click any font in android Studio:
As you can see, the cursor on the bottom has extra spacing but not on the top, so it fixed my problem.
The second key is you can't simply skip any of the code, otherwise it might not works. That's the reason you can found some people comment that an answer is working and some other people comment that it's not working.
Let's illustrated what will happen if I remove one of them.
Without setTypeface(mfont);:
Without setPadding(0, 0, 0, 0);:
Without setIncludeFontPadding(false);:
Without 3 of them (i.e. the original):
Negative Margins would do the work. You can set it by two methods -
1) by xml - set the android:Layout_marginTop="-10dp" field negative
2) by java (Programmatically) - set the topMargin field of LayoutParams to negative.
you should change the height of TextView and maybe change android:gravity="bottom"
height is between textsize and size of textView with Wrapcontent.
public class MyTextViewBounder extends TextView {
public MyTextViewBounder(Context context) {
super(context);
}
public MyTextViewBounder(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyTextViewBounder(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//test kích thước thực tế với kích thước của Textview bao quanh text của nó như thế nào
int width, height;
Paint iPaint;
Rect iRect = new Rect();
iPaint = new Paint();
iPaint.setTextSize(13);
iPaint.setTextAlign(Paint.Align.CENTER);
//call below code outsite
//this.setText("Hung");
//this.setTextSize(TypedValue.COMPLEX_UNIT_PX,13);
//this..setIncludeFontPadding(false); //height from 18px down to 15px
iPaint.getTextBounds("Hung",0,4,iRect); //width = 34px, height = 12px
width = this.getWidth(); //= 30px
height = this.getHeight(); //= 18px
width = this.getMeasuredWidth(); //=30px
height = this.getMeasuredHeight(); //= 18px
width = iRect.width(); //34px
height = iRect.height(); //12 px
}
}
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>