Develop Reference

Allocate fixed space for adaptive banner ad

How should I go about allocating fixed space for adaptive ad banners?
My XML adaptive banner
<FrameLayout
android:id="#+id/ad_view_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_alignParentBottom="true"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
/>
Inside my Fragment getting adaptive ad banner dimensions
private val adSize: AdSize
get() {
val outMetrics = Resources.getSystem().displayMetrics;
val density = outMetrics.density
var adWidthPixels = adContainerView.width.toFloat()
if (adWidthPixels == 0f) {
adWidthPixels = outMetrics.widthPixels.toFloat()
}
val adWidth = (adWidthPixels / density).toInt()
return AdSize.getCurrentOrientationBannerAdSizeWithWidth(context, adWidth)
}
I would like to follow Googles guidlines and have an allocated fixed space reserved for my banner, so that if my banner "lags" for a second screen on mobile stays the same.
How should I go about it, whats the proper way?

when starting the app you can get the adaptive banner height straight away by calling something like adSize.getHeight(). This will give you banner height in dps.
You then convert that heigth dps in px and set this height to your ad frame layout programatically by calling setLayoutParams with acquired height in pixels.
This way you dont need to wait for the ad to load to apply proper height and risk ad overlapping policy violation or conent shifting (which would happen if you depend on wrap_content)

If you have a more complex behavior, like I do, you can use the following implementation. I have a ConstraintLayout that splits my screen in two parts in portrait mode. The banner is within one of these two parts and the ratio between them is not fixed but depending on some logic. So this implementation also works with that requirement, as it overwrites onMeasure to determine the best size depending on the available width.
public class AdBanner extends FrameLayout
{
private AdView mAdView;
private final DisplayMetrics mDisplayMetrics = new DisplayMetrics();
public AdBanner(Context context)
{
super(context);
}
public AdBanner(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public AdBanner(Context context, AttributeSet attrs, int defStyleAttr)
{
super(context, attrs, defStyleAttr);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
if (!isShowBanner())
{
super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.AT_MOST));
return;
}
int width = MeasureSpec.getSize(widthMeasureSpec);
if (width <= 0)
{
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// That's where we determine the most accurate banner format.
AdSize adSize = AdSize.getCurrentOrientationAnchoredAdaptiveBannerAdSize(getContext(), getDpWidth(width));
int height = adSize.getHeightInPixels(getContext());
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
if (heightMode != MeasureSpec.UNSPECIFIED)
{
height = Math.min(height, MeasureSpec.getSize(heightMeasureSpec));
}
setMeasuredDimension(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, MeasureSpec.getMode(heightMeasureSpec)));
}
protected int getDpWidth(int width)
{
Display display = ((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
display.getMetrics(mDisplayMetrics);
return (int) (width / mDisplayMetrics.density);
}
protected boolean isShowBanner()
{
// Do your checks here, like whether the user payed for ad removement.
}
#Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
if (!isShowBanner())
{
return;
}
int width = r - l;
if (width <= 0)
{
return;
}
AdSize adSize = AdSize.getCurrentOrientationAnchoredAdaptiveBannerAdSize(getContext(), getDpWidth(width));
// Prevent the ad from beeing added with each layout cicle,
// by checking, whether or not available size actually changed the format of the banner
if (mAdView == null || !adSize.equals(mAdView.getAdSize()))
{
removeAllViews();
mAdView = new AdView(getContext());
mAdView.setAdSize(adSize);
((GameApplication) getContext().getApplicationContext()).androidInjector().getAdService().loadBannerAd(getRootActivity(this), mAdView);
this.addView(mAdView);
}
mAdView.layout(0, 0, width, b - t);
}
}

trouble drawing custom views inside linearlayout

I'm working on a composite android component in an attempt to learn more about them. The structure is fairly simple, it contains a textview as a title, an editText view and a LinearLayout acting as a list.
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Title"
android:textSize="20sp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/editText"
/>
<LinearLayout
android:id="#+id/ListPoint"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</LinearLayout>
</merge>
Most of this works fine, as everything shows up on screen. I can add any type of ordinary view to the internal LinearLayout and it works perfectly. The problem is, I have a custom list element component that does not display properly. Its sole purpose is to display text, a simple way for me to override the onMeasure and the onDraw methods.
I can add these custom view elements just fine to the internal layout, and they will call the overriden onMeasure and onDraw methods. However, only the first element added to the LinearLayout will show up on screen. I've searched around but i can't find the reason why this happens. Below is the relevant code.
public CustomView(Context context, int oriX, int oriY, Paint textColor, LayoutParams params) {
super(context);
this.params = params;
this.textColor= textColor;
this.context = context;
this.params = params;
elementText = "";
originX = oriX;
originY = oriY;
}
#Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
System.out.println("UsedMeasurements: " + getMeasuredWidth() + ", " + getMeasuredHeight());
canvas.drawText(elementText, originX, originY, textColor);
System.out.println(elementText + " drawn with origin: (" + originX + ", " + originY + ").");
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSpec = MeasureSpec.getSize(widthMeasureSpec);
int heightSpec = MeasureSpec.getSize(heightMeasureSpec);
int preferredWidth = params.width;
int preferredHeight = params.height;
int usedWidth;
int usedHeight;
if(widthMode == MeasureSpec.EXACTLY)
usedWidth = widthSpec;
else if(widthMode == MeasureSpec.AT_MOST)
usedWidth = Math.min(preferredWidth, widthSpec);
else
usedWidth = preferredWidth;
if(heightMode == MeasureSpec.EXACTLY)
usedHeight = heightSpec;
else if(heightMode == MeasureSpec.AT_MOST)
usedHeight = Math.min(preferredHeight, heightSpec);
else
usedHeight = preferredHeight;
setMeasuredDimension(usedWidth, usedHeight);
}
The print actions inside the onDraw function are there just to make sure that they get called. And they do, so that is not the problem. I have also made sure that the origin coordinates for the drawText function are inside the actual screenspace. I would really appreciate some assistance with this.

Android textview text get cut off on the sides with custom font

This is what happens in the preview and on device:
TextView is nothing special, it just loads the custom font:
public class TestTextView extends AppCompatTextView {
public TestTextView(Context context) {
super(context);
init(context);
}
public TestTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public TestTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
void init(Context context) {
Typeface t = Typeface.createFromAsset(context.getAssets(), "fonts/daisy.ttf");
setTypeface(t);
}
}
Layout is also very basic, but just in case:
<LinearLayout 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:background="#color/material_red200"
android:orientation="vertical">
<*custompackage* .TestTextView
android:gravity="left"
android:padding="0dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="just some text for testing"
android:textColor="#color/material_black"
android:textSize="100dp" />
</LinearLayout>
As you can see, the left parts, like 'j' and 'f' are cut off.
Setting the padding or margin did not work.
This font fits into it's frame when using from other programs.
Thanks in advance.
Edit:
What #play_err_ mentioned is not a solution in my case.
I am using in the final version a textview that resizes automatically, so adding spaces would be terribly difficult.
I need an explanation why other programs (eg photoshop, after effects...) can calculate a proper bounding box and android cannot
I am also loading different fonts dynamically and I do not want to create an
if(badfont)
addSpaces()

This answer has led me to the right path:
https://stackoverflow.com/a/28625166/4420543
So, the solution is to create a custom Textview and override the onDraw method:
#Override
protected void onDraw(Canvas canvas) {
final Paint paint = getPaint();
final int color = paint.getColor();
// Draw what you have to in transparent
// This has to be drawn, otherwise getting values from layout throws exceptions
setTextColor(Color.TRANSPARENT);
super.onDraw(canvas);
// setTextColor invalidates the view and causes an endless cycle
paint.setColor(color);
System.out.println("Drawing text info:");
Layout layout = getLayout();
String text = getText().toString();
for (int i = 0; i < layout.getLineCount(); i++) {
final int start = layout.getLineStart(i);
final int end = layout.getLineEnd(i);
String line = text.substring(start, end);
System.out.println("Line:\t" + line);
final float left = layout.getLineLeft(i);
final int baseLine = layout.getLineBaseline(i);
canvas.drawText(line,
left + getTotalPaddingLeft(),
// The text will not be clipped anymore
// You can add a padding here too, faster than string string concatenation
baseLine + getTotalPaddingTop(),
getPaint());
}
}

I have encountered the same problem and i found a one liner solution for thouse who are not using the TextView.shadowLayer.
this is based on the source code that [Dmitry Kopytov] brought here:
editTextOrTextView.setShadowLayer(editTextOrTextView.textSize, 0f, 0f, Color.TRANSPARENT)
that's it, now the canvas.clipRect in TextView.onDraw() won't cut off the curly font sides.

Reworked #Dmitry Kopytov solution:
in Kotlin
recycle the old bitmap
added documentation
fall back on default TextView rendering if the bitmap cannot be created (not enough memory)
Code:
/**
* This TextView is able to draw text on the padding area.
* It's mainly used to support italic texts in custom fonts that can go out of bounds.
* In this case, you've to set an horizontal padding (or just end padding).
*
* This implementation is doing a render-to-texture procedure, as such it consumes more RAM than a standard TextView,
* it uses an additional bitmap of the size of the view.
*/
class TextViewNoClipping(context: Context, attrs: AttributeSet?) : AppCompatTextView(context, attrs) {
private class NonClippableCanvas(#NonNull val bitmap: Bitmap) : Canvas(bitmap) {
override fun clipRect(left: Float, top: Float, right: Float, bottom: Float): Boolean {
return true
}
}
private var rttCanvas: NonClippableCanvas? = null
override fun onSizeChanged(width: Int, height: Int,
oldwidth: Int, oldheight: Int) {
if ((width != oldwidth || height != oldheight) && width > 0 && height > 0) {
rttCanvas?.bitmap?.recycle()
try {
Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)?.let {
rttCanvas = NonClippableCanvas(it)
}
} catch (t: Throwable) {
// If for some reasons the bitmap cannot be created, we fall back on default rendering (potentially cropping the text).
rttCanvas?.bitmap?.recycle()
rttCanvas = null
}
}
super.onSizeChanged(width, height, oldwidth, oldheight)
}
override fun onDraw(canvas: Canvas) {
rttCanvas?.let {
// Clear the RTT canvas from the previous font.
it.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR)
// Draw on the RTT canvas (-> bitmap) that will use clipping on the NonClippableCanvas, resulting in no-clipping
super.onDraw(it)
// Finally draw the bitmap that contains the rendered text (no clipping used here, will display on top of padding)
canvas.drawBitmap(it.bitmap, 0f, 0f, null)
} ?: super.onDraw(canvas) // If rtt is not available, use default rendering process
}
}

I encountered the same problem when I used some fonts in EditText.
My first attempt was to use padding. Size of view increased but text is still cropped.
Then I looked at the source code TextView. In method onDraw method Canvas.clipRect is called to perform this crop.
My solution to bypass cropping when use padding :
1) Сreate custom class inherited from Canvas and override method clipRect
public class NonClippableCanvas extends Canvas {
public NonClippableCanvas(#NonNull Bitmap bitmap) {
super(bitmap);
}
#Override
public boolean clipRect(float left, float top, float right, float bottom) {
return true;
}
}
2) Create custom TextView and override methods onSizeChanged and onDraw.
In the method onSizeChanged create bitmap and canvas.
In the method onDraw draw on bitmap by passing our custom Canvas to method super.onDraw. Next, draw this bitmap on the target canvas.
public class CustomTextView extends AppCompatTextView {
private Bitmap _bitmap;
private NonClippableCanvas _canvas;
#Override
protected void onSizeChanged(final int width, final int height,
final int oldwidth, final int oldheight) {
if (width != oldwidth || height != oldheight) {
_bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
_canvas = new NonClippableCanvas(_bitmap);
}
super.onSizeChanged(width, height, oldwidth, oldheight);
}
#Override
protected void onDraw(Canvas canvas) {
_canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
super.onDraw(_canvas);
canvas.drawBitmap(_bitmap, 0, 0, null);
}
}

A workaround is to add a space before typing. It will save you a lot of coding but will result in a "padding" to the left.
android:text=" text after a space"

replace TextView.BufferType.SPANNABLE with TextView.BufferType.NORMAL

What if you wrap it in another layout and add padding to that? For example something like this:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="24dp">
<*custompackage* .TestTextView
android:gravity="left"
android:padding="0dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="just some text for testing"
android:textColor="#color/material_black"
android:textSize="100dp" />
</RelativeLayout>
Not having your font and other themes etc I've just tried it with the cursive font for example and on my machine it would look like this.
screenshot
Update:
Looks like you're not the only one to have had this issue and the other answers here and here both unfortunately relate to adding extra spaces.
I've created a bug ticket here since it looks like a bug to me.

VideoView to match parent height and keep aspect ratio

I have a VideoView which is set up like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/player"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<VideoView
android:id="#+id/video"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:layout_centerVertical="true" />
<ProgressBar
android:id="#+id/loader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>
But the VideoView matches the width of the parent container, and then the height is set according to the aspect ratio of the loaded movie.
I would like to do just the opposite, I want the VideoView to match the height of the parent while keeping the aspect ratio intact, the video will be clipped on the sides.
I managed to stretch the VideoView to fill the parent but then the aspect ratio is not kept.
Another thing is, I'm adding MediaController to the VideoView like this:
MediaController controllers = new MediaController(this) {
#Override
public void hide() {
if (state != State.Hidden) {
this.show();
}
else {
super.hide();
}
}
};
controllers.setAnchorView(videoView);
videoView.setMediaController(controllers);
videoView.setOnPreparedListener(new OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mediaPlayer) {
controllers.show();
}
});
This works great, and the controllers always stay on, but the height of the controllers is not being taken into account when calculating where to place the video (since it's vertically centered).
My two questions then are:
How do I make the VideoView match the height of the parent yet keep the aspect ratio?
How do I make the VideoView take into account the height of it's controllers?
Thanks.

You should extends from the built-in video view.
Call setVideoSize before video view is shown, you can get video size from thumbnail extracted from video.
So that, when video view's onMeasure is called, both mVideoWidth & mVideoHeight are > 0.
If you want to account the height of controllers, you can do it yourself in the onMeasure method.
Hope will help.
public class MyVideoView extends VideoView {
private int mVideoWidth;
private int mVideoHeight;
public MyVideoView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyVideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public MyVideoView(Context context) {
super(context);
}
public void setVideoSize(int width, int height) {
mVideoWidth = width;
mVideoHeight = height;
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Log.i("###", "onMeasure");
int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
if (mVideoWidth > 0 && mVideoHeight > 0) {
if (mVideoWidth * height > width * mVideoHeight) {
// Log.i("###", "image too tall, correcting");
height = width * mVideoHeight / mVideoWidth;
} else if (mVideoWidth * height < width * mVideoHeight) {
// Log.i("###", "image too wide, correcting");
width = height * mVideoWidth / mVideoHeight;
} else {
// Log.i("###", "aspect ratio is correct: " +
// width+"/"+height+"="+
// mVideoWidth+"/"+mVideoHeight);
}
}
// Log.i("###", "setting size: " + width + 'x' + height);
setMeasuredDimension(width, height);
}
}

I solved this problem with layout. It seems that it worked fine when it was pinned to the corners but it caused the video to skew. To test I changed my relative layout's background to #990000 to see the red poking through.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/relative_parent"
android:background="#000000">
<VideoView
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:focusable="false"
android:focusableInTouchMode="false"
android:id="#+id/videoView" />
</RelativeLayout>

Regarding question 1, I am surprised no one has mentioned the possible use of the MediaPlayer's scaling mode.
https://developer.android.com/reference/android/media/MediaPlayer.html#setVideoScalingMode(int)
It has 2 modes. Both of them always fill the view area. To get it to fill the space while preserving the aspect ratio, thus cropping the long side, you need to switch to the second mode, VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING. That solves one part of the problem. The other part is to change VideoView's measuring behavior, just as some of the other answers demonstrate. This is the way I did it, mostly out of laziness and not familiar with the metadata API's that the others use, you are welcome to use this method or one of the other methods to fix the size of the view. The blanket catch ensures safety when this is called before mMediaPlayer exists, as it may be called many times, and also falls back to old behavior should the field name ever change.
class FixedSizeVideoView : VideoView {
constructor(ctx: Context) : super(ctx)
constructor(ctx: Context, attrs: AttributeSet) : super(ctx, attrs)
// rather than shrink down to fit, stay at the size requested by layout params. Let the scaling mode
// of the media player shine through. If the scaling mode on the media player is set to the one
// with cropping, you can make a player similar to AVLayerVideoGravityResizeAspectFill on iOS
override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
try {
val mpField = VideoView::class.java.getDeclaredField("mMediaPlayer")
mpField.isAccessible = true
val mediaPlayer: MediaPlayer = mpField.get(this) as MediaPlayer
val width = View.getDefaultSize(mediaPlayer.videoWidth, widthMeasureSpec)
val height = View.getDefaultSize(mediaPlayer.videoHeight, heightMeasureSpec)
setMeasuredDimension(width, height)
}
catch (ex: Exception) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec)
}
}
}
So using this class in the layout, you just change the scaling mode on the media Player wherever you have a chance. Such as:
video.setOnPreparedListener { mp: MediaPlayer ->
mp.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING)
mp.isLooping = true
mp.setScreenOnWhilePlaying(false)
}
video.start()

public class MyVideoView extends VideoView {
private int mVideoWidth;
private int mVideoHeight;
public MyVideoView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyVideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public MyVideoView(Context context) {
super(context);
}
#Override
public void setVideoURI(Uri uri) {
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
retriever.setDataSource(this.getContext(), uri);
mVideoWidth = Integer.parseInt(retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH));
mVideoHeight = Integer.parseInt(retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT));
super.setVideoURI(uri);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Log.i("###", "onMeasure");
int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
if (mVideoWidth > 0 && mVideoHeight > 0) {
if (mVideoWidth * height > width * mVideoHeight) {
// Log.i("###", "image too tall, correcting");
height = width * mVideoHeight / mVideoWidth;
} else if (mVideoWidth * height < width * mVideoHeight) {
// Log.i("###", "image too wide, correcting");
width = height * mVideoWidth / mVideoHeight;
} else {
// Log.i("###", "aspect ratio is correct: " +
// width+"/"+height+"="+
// mVideoWidth+"/"+mVideoHeight);
}
}
// Log.i("###", "setting size: " + width + 'x' + height);
setMeasuredDimension(width, height);
}
}

Quick and efficient fix:
No need to create a custom view extending from VideoView. Just set a value big enough to android:layout_width. This will set the widthSpecMode of the video view to View.MeasureSpec.AT_MOST and then the onMeasure() method of VideoView will auto-adjust its width keeping the ratio.
<VideoView
android:id="#+id/video"
android:layout_width="2000dp"
android:layout_height="match_parent" />

Using ConstraintLayout we can achieve this, refer below xml code.
When layout_width and layout_height are 0dp, the size and position of the VideoView are calculated dynamically based on the other constraints. The layout_constraintDimensionRatio attribute indicates that when the app calculates the size of the VideoView, the ratio of the width to the height should be 3:4. This constraint keeps the aspect ratio of the video the same and prevents the view from being stretched too far in either direction (depending on how the device is rotated).
Change layout_constraintDimensionRatio value depending on requirement Portrait/Landscape.
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<VideoView
android:id="#+id/videoView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintDimensionRatio="3:4"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

For the first time a question answered my issue instead of answers!!
My issue was that I had a white space under the video on full screen. I was setting the layout_height to match_parent. The solution was to set it to wrap_content and give the parent a black background. That, and having the VideoView centered vertically in its parent.
I wrote this as a comment but then thought someone might have the same
issue I had, so here it is as an answer also.

I've tried a lot of solutions, while my video was always in 1000*1000 format, so I've created an easy solution for people who know their aspect ratio. First create a VideoView in a RelativeLayout like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/video_holder"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:clipToPadding="false">
<VideoView
android:id="#+id/videoView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentEnd="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
Then before you load the video change the height and with programmatically like this:
int i = videoView.getHeight() > videoView.getWidth() ? videoView.getHeight() : videoView.getWidth();
video_holder.setLayoutParams(new ConstraintLayout.LayoutParams(i, i));
Of course this only works with 1:1 aspect ratio's but you could just use your aspect ratio to change either the height or the width.

Jobbert's answer in Kotlin, in case anyone needs it:
val max = if (videoView.height > videoView.width) videoView.height else videoView.width
videoView.layoutParams = ConstraintLayout.LayoutParams(max, max)

I have been looking for ways to display video in aspect fill in VideoView but after trying many solutions, none of them seems to work.
So I implemented the following approach and it's working for me:
Code:
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// getting screen size
((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;
double videoSizeRatio = (double) mVideoHeight / mVideoWidth;
double screenSizeRatio = (double) height / width;
if (mVideoWidth > 0 && mVideoHeight > 0) {
if (videoSizeRatio > screenSizeRatio) { // screen is wider than video width
height = (int) (videoSizeRatio * width);
} else if (videoSizeRatio < screenSizeRatio) {
width = (int) (height / videoSizeRatio);
}
}
setMeasuredDimension(width, height);
}
Layout:
<YourCustomizedVideoView
android:id="#+id/videoView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
/>

The best way to do so is
Set width of videoview to max
I was facing the same issue.
I just set the Width to 999px
and Height to match parent
It works.
We get a perfect view like Tik tok or Instagram reels

Just put your VideoView inside the RelativeLayout and set the desired size for that relative layout. like below code,
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="300dp">
<VideoView
android:id="#+id/videoView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true" />
</RelativeLayout>
It will work.

You just need to put Videoview widget in RelativeLayout (changes in xml file only)
here is reference answer link

Android font size not scaling on tablet [duplicate]

I'm trying to create a method for resizing multi-line text in a TextView such that it fits within the bounds (both the X and Y dimensions) of the TextView.
At present, I have something, but all it does is resize the text such that just the first letter/character of the text fills the dimensions of the TextView (i.e. only the first letter is viewable, and it's huge). I need it to fit all the lines of the text within the bounds of the TextView.
Here is what I have so far:
public static void autoScaleTextViewTextToHeight(TextView tv)
{
final float initSize = tv.getTextSize();
//get the width of the view's back image (unscaled)....
float minViewHeight;
if(tv.getBackground()!=null)
{
minViewHeight = tv.getBackground().getIntrinsicHeight();
}
else
{
minViewHeight = 10f;//some min.
}
final float maxViewHeight = tv.getHeight() - (tv.getPaddingBottom()+tv.getPaddingTop())-12;// -12 just to be sure
final String s = tv.getText().toString();
//System.out.println(""+tv.getPaddingTop()+"/"+tv.getPaddingBottom());
if(minViewHeight >0 && maxViewHeight >2)
{
Rect currentBounds = new Rect();
tv.getPaint().getTextBounds(s, 0, s.length(), currentBounds);
//System.out.println(""+initSize);
//System.out.println(""+maxViewHeight);
//System.out.println(""+(currentBounds.height()));
float resultingSize = 1;
while(currentBounds.height() < maxViewHeight)
{
resultingSize ++;
tv.setTextSize(resultingSize);
tv.getPaint().getTextBounds(s, 0, s.length(), currentBounds);
//System.out.println(""+(currentBounds.height()+tv.getPaddingBottom()+tv.getPaddingTop()));
//System.out.println("Resulting: "+resultingSize);
}
if(currentBounds.height()>=maxViewHeight)
{
//just to be sure, reduce the value
tv.setTextSize(resultingSize-1);
}
}
}
I think the problem is in the use of tv.getPaint().getTextBounds(...). It always returns small numbers for the text bounds... small relative to the tv.getWidth() and tv.getHeight() values... even if the text size is far larger than the width or height of the TextView.

The AutofitTextView library from MavenCentral handles this nicely. The source hosted on Github(1k+ stars) at https://github.com/grantland/android-autofittextview
Add the following to your app/build.gradle
repositories {
mavenCentral()
}
dependencies {
implementation 'me.grantland:autofittextview:0.2.+'
}
Enable any View extending TextView in code:
AutofitHelper.create(textView);
Enable any View extending TextView in XML:
<me.grantland.widget.AutofitLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
/>
</me.grantland.widget.AutofitLayout>
Use the built in Widget in code or XML:
<me.grantland.widget.AutofitTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:singleLine="true"
/>

New since Android O:
https://developer.android.com/preview/features/autosizing-textview.html
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:autoSizeTextType="uniform"
android:autoSizeMinTextSize="12sp"
android:autoSizeMaxTextSize="100sp"
android:autoSizeStepGranularity="2sp"
/>

I have played with this for quite some time, trying to get my font sizes correct on a wide variety of 7" tablets (kindle fire, Nexus7, and some inexpensive ones in China with low-res screens) and devices.
The approach that finally worked for me is as follows. The "32" is an arbitrary factor that basically gives about 70+ characters across a 7" tablet horizontal line, which is a font size I was looking for. Adjust accordingly.
textView.setTextSize(getFontSize(activity));
public static int getFontSize (Activity activity) {
DisplayMetrics dMetrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(dMetrics);
// lets try to get them back a font size realtive to the pixel width of the screen
final float WIDE = activity.getResources().getDisplayMetrics().widthPixels;
int valueWide = (int)(WIDE / 32.0f / (dMetrics.scaledDensity));
return valueWide;
}

I was able to answer my own question using the following code (see below), but my solution was very specific to the application. For instance, this will probably only look good and/or work for a TextView sized to approx. 1/2 the screen (with also a 40px top margin and 20px side margins... no bottom margin).
The using this approach though, you can create your own similar implementation. The static method basically just looks at the number of characters and determines a scaling factor to apply to the TextView's text size, and then incrementally increases the text size until the overall height (an estimated height -- using the width of the text, the text height, and the width of the TextView) is just below that of the TextView. The parameters necessary to determine the scaling factor (i.e. the if/else if statements) were set by guess-and-check. You'll likely have to play around with the numbers to make it work for your particular application.
This isn't the most elegant solution, though it was easy to code and it works for me. Does anyone have a better approach?
public static void autoScaleTextViewTextToHeight(final TextView tv, String s)
{
float currentWidth=tv.getPaint().measureText(s);
int scalingFactor = 0;
final int characters = s.length();
//scale based on # of characters in the string
if(characters<5)
{
scalingFactor = 1;
}
else if(characters>=5 && characters<10)
{
scalingFactor = 2;
}
else if(characters>=10 && characters<15)
{
scalingFactor = 3;
}
else if(characters>=15 && characters<20)
{
scalingFactor = 3;
}
else if(characters>=20 && characters<25)
{
scalingFactor = 3;
}
else if(characters>=25 && characters<30)
{
scalingFactor = 3;
}
else if(characters>=30 && characters<35)
{
scalingFactor = 3;
}
else if(characters>=35 && characters<40)
{
scalingFactor = 3;
}
else if(characters>=40 && characters<45)
{
scalingFactor = 3;
}
else if(characters>=45 && characters<50)
{
scalingFactor = 3;
}
else if(characters>=50 && characters<55)
{
scalingFactor = 3;
}
else if(characters>=55 && characters<60)
{
scalingFactor = 3;
}
else if(characters>=60 && characters<65)
{
scalingFactor = 3;
}
else if(characters>=65 && characters<70)
{
scalingFactor = 3;
}
else if(characters>=70 && characters<75)
{
scalingFactor = 3;
}
else if(characters>=75)
{
scalingFactor = 5;
}
//System.out.println(((int)Math.ceil(currentWidth)/tv.getWidth()+scalingFactor));
//the +scalingFactor is important... increase this if nec. later
while((((int)Math.ceil(currentWidth)/tv.getWidth()+scalingFactor)*tv.getTextSize())<tv.getHeight())
{
tv.setTextSize(TypedValue.COMPLEX_UNIT_SP, tv.getTextSize()+0.25f);
currentWidth=tv.getPaint().measureText(s);
//System.out.println(((int)Math.ceil(currentWidth)/tv.getWidth()+scalingFactor));
}
tv.setText(s);
}
Thanks.

I had the same problem and wrote a class that seems to work for me. Basically, I used a static layout to draw the text in a separate canvas and remeasure until I find a font size that fits. You can see the class posted in the topic below. I hope it helps.
Auto Scale TextView Text to Fit within Bounds

Stumbled upon this whilst looking for a solution myself... I'd tried all the other solutions out there that I could see on stack overflow etc but none really worked so I wrote my own.
Basically by wrapping the text view in a custom linear layout I've been able to successfully measure the text properly by ensuring it is measured with a fixed width.
<!-- TextView wrapped in the custom LinearLayout that expects one child TextView -->
<!-- This view should specify the size you would want the text view to be displayed at -->
<com.custom.ResizeView
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_margin="10dp"
android:layout_weight="1"
android:orientation="horizontal" >
<TextView
android:id="#+id/CustomTextView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
</com.custom.ResizeView>
Then the linear layout code
public class ResizeView extends LinearLayout {
public ResizeView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ResizeView(Context context) {
super(context);
}
#Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
// oldWidth used as a fixed width when measuring the size of the text
// view at different font sizes
final int oldWidth = getMeasuredWidth() - getPaddingBottom() - getPaddingTop();
final int oldHeight = getMeasuredHeight() - getPaddingLeft() - getPaddingRight();
// Assume we only have one child and it is the text view to scale
TextView textView = (TextView) getChildAt(0);
// This is the maximum font size... we iterate down from this
// I've specified the sizes in pixels, but sp can be used, just modify
// the call to setTextSize
float size = getResources().getDimensionPixelSize(R.dimen.solutions_view_max_font_size);
for (int textViewHeight = Integer.MAX_VALUE; textViewHeight > oldHeight; size -= 0.1f) {
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
// measure the text views size using a fixed width and an
// unspecified height - the unspecified height means measure
// returns the textviews ideal height
textView.measure(MeasureSpec.makeMeasureSpec(oldWidth, MeasureSpec.EXACTLY), MeasureSpec.UNSPECIFIED);
textViewHeight = textView.getMeasuredHeight();
}
}
}
Hope this helps someone.

maybe try setting setHoriztonallyScrolling() to true before taking text measurements so that the textView doesn't try to layout your text on multiple lines

One way would be to specify different sp dimensions for each of the generalized screen sizes. For instance, provide 8sp for small screens, 12sp for normal screens, 16 sp for large and 20 sp for xlarge. Then just have your layouts refer to #dimen text_size or whatever and you can rest assured, as density is taken care of via the sp unit. See the following link for more info on this approach.
http://www.developer.android.com/guide/topics/resources/more-resources.html#Dimension
I must note, however, that supporting more languages means more work during the testing phase, especially if you're interested in keeping text on one line, as some languages have much longer words. In that case, make a dimens.xml file in the values-de-large folder, for example, and tweak the value manually. Hope this helps.

Here is a solution that I created based on some other feedback. This solution allows you to set the size of the text in XML which will be the max size and it will adjust itself to fit the view height.
Size Adjusting TextView
private float findNewTextSize(int width, int height, CharSequence text) {
TextPaint textPaint = new TextPaint(getPaint());
float targetTextSize = textPaint.getTextSize();
int textHeight = getTextHeight(text, textPaint, width, targetTextSize);
while(textHeight > height && targetTextSize > mMinTextSize) {
targetTextSize = Math.max(targetTextSize - 1, mMinTextSize);
textHeight = getTextHeight(text, textPaint, width, targetTextSize);
}
return targetTextSize;
}
private int getTextHeight(CharSequence source, TextPaint paint, int width, float textSize) {
paint.setTextSize(textSize);
StaticLayout layout = new StaticLayout(source, paint, width, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, true);
return layout.getHeight();
}

If your only requirement is to have the text automatically split and continue in the next line and the height is not important then just have it like this.
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:maxEms="integer"
android:width="integer"/>
This will have your TextView wrap to it's content vertically depending on your maxEms value.

Check if my solution helps you:
Auto Scale TextView Text to Fit within Bounds

I found that this worked well for me. see: https://play.google.com/store/apps/details?id=au.id.rupert.chauffeurs_name_board&hl=en
Source Code at http://www.rupert.id.au/chauffeurs_name_board/verson2.php
http://catchthecows.com/?p=72 and https://github.com/catchthecows/BigTextButton

This is based on mattmook's answer. It worked well on some devices, but not on all. I moved the resizing to the measuring step, made the maximum font size a custom attribute, took margins into account, and extended FrameLayout instead of LineairLayout.
public class ResizeView extends FrameLayout {
protected float max_font_size;
public ResizeView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.ResizeView,
0, 0);
max_font_size = a.getDimension(R.styleable.ResizeView_maxFontSize, 30.0f);
}
public ResizeView(Context context) {
super(context);
}
#Override
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
// Use the parent's code for the first measure
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// Assume we only have one child and it is the text view to scale
final TextView textView = (TextView) getChildAt(0);
// Check if the default measure resulted in a fitting textView
LayoutParams childLayout = (LayoutParams) textView.getLayoutParams();
final int textHeightAvailable = getMeasuredHeight() - getPaddingTop() - getPaddingBottom() - childLayout.topMargin - childLayout.bottomMargin;
int textViewHeight = textView.getMeasuredHeight();
if (textViewHeight < textHeightAvailable) {
return;
}
final int textWidthSpec = MeasureSpec.makeMeasureSpec(
MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight() - childLayout.leftMargin - childLayout.rightMargin,
MeasureSpec.EXACTLY);
final int textHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
for (float size = max_font_size; size >= 1.05f; size-=0.1f) {
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
textView.measure(textWidthSpec, textHeightSpec);
textViewHeight = textView.getMeasuredHeight();
if (textViewHeight <= textHeightAvailable) {
break;
}
}
}
}
And this in attrs.xml:
<declare-styleable name="ResizeView">
<attr name="maxFontSize" format="reference|dimension"/>
</declare-styleable>
And finally used like this:
<PACKAGE_NAME.ui.ResizeView xmlns:custom="http://schemas.android.com/apk/res/PACKAGE_NAME"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="start|center_vertical"
android:padding="5dp"
custom:maxFontSize="#dimen/normal_text">
<TextView android:id="#+id/tabTitle2"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</PACKAGE_NAME.ui.ResizeView>

Try this...
tv.setText("Give a very large text anc check , this xample is very usefull");
countLine=tv.getLineHeight();
System.out.println("LineCount " + countLine);
if (countLine>=40){
tv.setTextSize(15);
}