How to get screen dimensions as pixels in Android

Asked 2023-09-21 08:07:10 View 219,422

I created some custom elements, and I want to programmatically place them to the upper right corner (n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen width and screen height and then set position:

int px = screenWidth - m;
int py = screenHeight - n;

How do I get screenWidth and screenHeight in the main Activity?

  • Use dp instead of px. because it will distort your layout with other devices.. - anyone
  • Don't forget to multiply by getResources().getDisplayMetrics().density to account for display scaling - anyone
  • This proves the most up-voted answer is not always the best (& lots of people repeat answers for rep). Instead of getSize and deprecated getWidth/getHeight combo (ignoring errors), try Balaji.K's getMetrics. Nik's comment in his answer even explains getDisplayMetrics to consider the system/status bar size. Also you may use density as jmaculate and LoungeKatt explained to have the EXACT value:DisplayMetrics dm = getResources().getDisplayMetrics(); float fwidth = dm.density * dm.widthPixels; Tested in Android v2.2 (API 8) and v4.0 with good results and no errors/warnings. - anyone
  • DisplayMetrics displaymetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); int height = displaymetrics.heightPixels; int width = displaymetrics.widthPixels; - anyone
  • another way to get the DisplayMetrics : Resources.getSystem().getDisplayMetrics(). You won't need a Context to get them. - anyone

Answers

For API Level 30, WindowMetrics.getBounds is to be used. An example of its usage can be found in the linked docs:

 final WindowMetrics metrics = windowManager.getCurrentWindowMetrics();
 // Gets all excluding insets
 final WindowInsets windowInsets = metrics.getWindowInsets();
 Insets insets = windowInsets.getInsetsIgnoringVisibility(WindowInsets.Type.navigationBars()
         | WindowInsets.Type.displayCutout());

 int insetsWidth = insets.right + insets.left;
 int insetsHeight = insets.top + insets.bottom;

 // Legacy size that Display#getSize reports
 final Rect bounds = metrics.getBounds();
 final Size legacySize = new Size(bounds.width() - insetsWidth,
         bounds.height() - insetsHeight);

Old answer:

If you want the display dimensions in pixels you can use getSize:

Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
int height = size.y;

If you're not in an Activity you can get the default Display via WINDOW_SERVICE:

WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();

If you are in a fragment and want to acomplish this just use Activity.WindowManager (in Xamarin.Android) or getActivity().getWindowManager() (in java).

Before getSize was introduced (in API level 13), you could use the getWidth and getHeight methods that are now deprecated:

Display display = getWindowManager().getDefaultDisplay(); 
int width = display.getWidth();  // deprecated
int height = display.getHeight();  // deprecated

For the use case, you're describing, however, a margin/padding in the layout seems more appropriate.

Another way is: DisplayMetrics

A structure describing general information about a display, such as its size, density, and font scaling. To access the DisplayMetrics members, initialize an object like this:

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);

We can use widthPixels to get information for:

"The absolute width of the display in pixels."

Example:

Log.d("ApplicationTagName", "Display width in px is " + metrics.widthPixels);

Answered   2023-09-21 08:07:10

  • getWidth() or getSize()? What would I use if I need my app to run on API <13 as well as API >13? - anyone
  • try { display.getSize(size); width = size.x; height = size.y; } catch (NoSuchMethodError e) { width = display.getWidth(); height = display.getHeight(); } - anyone
  • I don't see why you want to use try/catch for such a check? Why not simply use if (android.os.Build.VERSION.SDK_INT >= 13) without any thrown exception at all? I think of try/catch in a normal app-flow as bad practice. - anyone
  • @A-Live then the app would break as well (but not crashing). We developers must pre-check a new os version nevertheless and this maybe just conceal a problem. Also with this argument one could/should surround every few code lines with try/catch, which in my opinion is bad practice as mentioned already. - anyone
  • what if you want to get the screen size excluding the navigation bar and/or notification bar - anyone

One way is:

Display display = getWindowManager().getDefaultDisplay(); 
int width = display.getWidth();
int height = display.getHeight();

It is deprecated, and you should try the following code instead. The first two lines of code gives you the DisplayMetrics objecs. This objects contains the fields like heightPixels, widthPixels.

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
      
int height = metrics.heightPixels;
int width = metrics.widthPixels;

Api level 30 update

final WindowMetrics metrics = windowManager.getCurrentWindowMetrics();
 // Gets all excluding insets
 final WindowInsets windowInsets = metrics.getWindowInsets();
 Insets insets = windowInsets.getInsetsIgnoringVisibility(WindowInsets.Type.navigationBars()
         | WindowInsets.Type.displayCutout());

 int insetsWidth = insets.right + insets.left;
 int insetsHeight = insets.top + insets.bottom;

 // Legacy size that Display#getSize reports
 final Rect bounds = metrics.getBounds();
 final Size legacySize = new Size(bounds.width() - insetsWidth,
         bounds.height() - insetsHeight);

Answered   2023-09-21 08:07:10

  • Note that the metrics (width, height) change depending on the rotation of the device. - anyone
  • Metrics will return the size of the display, but HoneyComb and up, your activity will have less space than what's returned due to the system bar. - anyone
  • @Guy it depends on your implementation. You can hide the status bar: requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); - anyone
  • Also exists this way: getContext().getResources().getDisplayMetrics().widthPixels - anyone
  • final float scale = getResources().getDisplayMetrics().density; int width = (int) (metrics.widthPixels * scale + 0.5f); - You have to account for device density when doing it that way. - anyone

It may not answer your question, but it could be useful to know (I was looking for it myself when I came to this question) that if you need a View's dimension but your code is being executed when its layout has not been laid out yet (for example in onCreate() ) you can setup a ViewTreeObserver.OnGlobalLayoutListener with View.getViewTreeObserver().addOnGlobalLayoutListener() and put the relevant code that needs the view's dimension there. The listener's callback will be called when the layout will have been laid out.

Answered   2023-09-21 08:07:10

  • or just write view.post - anyone
  • view.post is not guaranteed to work though. It is just a workaround. - anyone
  • @marsbear where does it say View.post() isn't guaranteed to work? I'm curious because I also rely on this method for getting a View's size after layout and was unaware it unreliable. - anyone
  • @Turbo I say that :p We used that workaround before and it turned out to be unreliable. That workaround is based on the assumption, that the initially layouting is done within the same UIThread turn as the initialization. Hence you could schedule your code to run before the next UI turn via post() and be fine. It turned out that the layouting might take even longer under certain circumstances and the view was still not layouted when the posted code ran. What I do now is add the ViewTreeObserver in onCreate and remove it after the first onLayout. Init your stuff during that first onLayout. - anyone
  • @marsbear does it matter which View you get the ViewTreeObserver from? Or do they all share the same one? - anyone

(2012 answer, may be out of date) If you want to support pre Honeycomb, you will need to put in backward compatibility prior to API 13. Something like:

int measuredWidth = 0;
int measuredHeight = 0;
WindowManager w = getWindowManager();

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
    Point size = new Point();
    w.getDefaultDisplay().getSize(size);
    measuredWidth = size.x;
    measuredHeight = size.y;
} else {
    Display d = w.getDefaultDisplay();
    measuredWidth = d.getWidth();
    measuredHeight = d.getHeight();
}

Of course the deprecated methods will eventually be taken out of the the most recent SDKs, but while we still rely on most of our users having Android 2.1, 2.2 and 2.3, this is what we are left with.

Answered   2023-09-21 08:07:10

  • Yeah, this was back in 2012. - anyone
  • sorry, allow me to clarify what I meant. It is highly unlikely that anyone would support API <14 as of 6/22/2015 - anyone

I have tried all possible "solutions" unsuccessfully and I noticed that Elliott Hughes' "Dalvik Explorer" app always shows correct dimension on any Android device/OS version. I ended up looking at his open source project that can be found here: https://code.google.com/p/enh/

Here's all the relevant code:

WindowManager w = activity.getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);
// since SDK_INT = 1;
widthPixels = metrics.widthPixels;
heightPixels = metrics.heightPixels;
try {
    // used when 17 > SDK_INT >= 14; includes window decorations (statusbar bar/menu bar)
    widthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(d);
    heightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(d);
} catch (Exception ignored) {
}
try {
    // used when SDK_INT >= 17; includes window decorations (statusbar bar/menu bar)
    Point realSize = new Point();
    Display.class.getMethod("getRealSize", Point.class).invoke(d, realSize);
    widthPixels = realSize.x;
    heightPixels = realSize.y;
} catch (Exception ignored) {
}

EDIT: slightly improved version (avoid firing exceptions on non-supported OS version):

WindowManager w = activity.getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);
// since SDK_INT = 1;
widthPixels = metrics.widthPixels;
heightPixels = metrics.heightPixels;
// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 14 && Build.VERSION.SDK_INT < 17)
try {
    widthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(d);
    heightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(d);
} catch (Exception ignored) {
}
// includes window decorations (statusbar bar/menu bar)
if (Build.VERSION.SDK_INT >= 17)
try {
    Point realSize = new Point();
    Display.class.getMethod("getRealSize", Point.class).invoke(d, realSize);
    widthPixels = realSize.x;
    heightPixels = realSize.y;
} catch (Exception ignored) {
}

Answered   2023-09-21 08:07:10

  • This is the only post here that takes into account the window decorations (statusbar/menu bar). worked great for me. - anyone
  • Awesome, however you should never have expected business logic fire exceptions. Exception firing(even when caught) is horrible for performance. Plus you are doing more work than needed if the SDK_INT is > 13. Instead, you should just add some ifs on the Build.VERSION.SDK_INT. - anyone
  • @Erik B, I agree. I added improved version. Still I left the part "since SDK 1" just in case something goes wrong in try/catch (I've seen many bad things in Android especially when you think it's impossible something to go wrong so I like to keep it safe :)). Anyway there shouldn't be too mouch overhead since this calculation should be done only once (e.g. values could be kept in some static attributes). - anyone
  • Note that this code is licensed under GPL v3 which has implications for using in production apps. - anyone
  • GPL and depending on reflection to call methods which might not be present in future Android versions. Mhhh - anyone

Simplest way:

 int screenHeight = getResources().getDisplayMetrics().heightPixels;
 int screenWidth = getResources().getDisplayMetrics().widthPixels; 

Answered   2023-09-21 08:07:10

For accessing the height of the status bar for Android devices, we prefer a programmatic way to get it:

Sample code

int resId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resId > 0) {
    result = getResources().getDimensionPixelSize(resId);
}

The variable result gives the height in the pixel.

For quick access

Enter image description here

For more information about height of Title bar, Navigation bar and Content View, kindly look on Android Device Screen Sizes.

Answered   2023-09-21 08:07:10

  • Just what i needed! getResources().getDisplayMetrics().heightPixels + result gives actual fullscreen height. Dragan Marjanović's answer also works but I prefer this much shorter and simpler solution. - anyone
  • This approach is outdated as of Android Marshmallow. Status bar height can change from device or Android version. Better use OnApplyWindowInsetsListener. - anyone

First get view (eg. by findViewById()) and then you can use getWidth() on the view itself.

Answered   2023-09-21 08:07:10

  • This is actually how the documentation tells you to do it... but it's kinda pointless if you are NOT using a view. you may be using something else, e.g. mglsurfaceview. - anyone
  • this is better as the parent view may not be the size of the display. But make sure that this is done at a point where the view you are querying the size of has already been layed out, which will not usually be inside onCreate(). You can use a custom callback from onWindowFocusChanged(boolean hasFocus) which will be called after all the views have been measured and so on, ensuring you will not receive incorrect dimensions for the view you are interested it... - anyone

I have two functions, one for sending the context and the other getting height and width in pixels:

public static int getWidth(Context mContext){
    int width=0;
    WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    if(Build.VERSION.SDK_INT>12){
        Point size = new Point();
        display.getSize(size);
        width = size.x;
    }
    else{
        width = display.getWidth();  // Deprecated
    }
    return width;
}

and

public static int getHeight(Context mContext){
    int height=0;
    WindowManager wm = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    if(Build.VERSION.SDK_INT>12){
        Point size = new Point();
        display.getSize(size);
        height = size.y;
    }
    else{
        height = display.getHeight();  // Deprecated
    }
    return height;
}

Answered   2023-09-21 08:07:10

  • You need to add @SuppressLint("NewApi") just above the function signature in order to be able to compile. - anyone
  • I think it's better to get the height and width in one go rather than in separate calls to the APIs because otherwise they could be out of sync. This could happen if the screen orientation is changing while your code is running. - anyone

For dynamically scaling using XML there is an attribute called "android:layout_weight"

The below example, modified from synic's response on this thread, shows a button that takes up 75% of the screen (weight = .25) and a text view taking up the remaining 25% of the screen (weight = .75).

<LinearLayout android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <Button android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight=".25"
        android:text="somebutton">

    <TextView android:layout_width="fill_parent"
        android:layout_height="Wrap_content"
        android:layout_weight=".75">
</LinearLayout>

Answered   2023-09-21 08:07:10

This is the code I use for the task:

// `activity` is an instance of Activity class.
Display display = activity.getWindowManager().getDefaultDisplay();
Point screen = new Point();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
    display.getSize(screen);
} else {            
    screen.x = display.getWidth();
    screen.y = display.getHeight();
}

Seems clean enough and yet, takes care of the deprecation.

Answered   2023-09-21 08:07:10

Isn't this a much better solution? DisplayMetrics comes with everything you need and works from API 1.

public void getScreenInfo(){
    DisplayMetrics metrics = new DisplayMetrics();
    getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

    heightPixels = metrics.heightPixels;
    widthPixels = metrics.widthPixels;
    density = metrics.density;
    densityDpi = metrics.densityDpi;
}

You can also get the actual display (including screen decors, such as Status Bar or software navigation bar) using getRealMetrics, but this works on 17+ only.

Am I missing something?

Answered   2023-09-21 08:07:10

  • It's not subtracting space for on-screen controls (such as on Tablets or Nexus devices). Also, I get a different value (750 vs 800) on my 10" Tablet, depending on whether the Activity is active when the calculation is done. But for my purposes, this is more than fine. Thank you! - anyone

Just adding to Francesco's answer. The other observer that is more apt, if you want to find out the location in window or location in screen is ViewTreeObserver.OnPreDrawListener()

This also can be used to find other attributes of a view that is mostly unknown at onCreate() time e.g. the scrolled position, the scaled position.

Answered   2023-09-21 08:07:10

Find width and height of the screen:

width = getWindowManager().getDefaultDisplay().getWidth();
height = getWindowManager().getDefaultDisplay().getHeight();

Using this, we can get the latest and above SDK 13.

// New width and height
int version = android.os.Build.VERSION.SDK_INT;
Log.i("", " name == "+ version);
Display display = getWindowManager().getDefaultDisplay();
int width;
if (version >= 13) {
    Point size = new Point();
    display.getSize(size);
    width = size.x;
    Log.i("width", "if =>" +width);
}
else {
    width = display.getWidth();
    Log.i("width", "else =>" +width);
}

Answered   2023-09-21 08:07:10

DisplayMetrics dimension = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dimension);
int w = dimension.widthPixels;
int h = dimension.heightPixels;

Answered   2023-09-21 08:07:10

Using the following code in Activity.

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int wwidth = metrics.widthPixels;

Answered   2023-09-21 08:07:10

Need to say, that if you are not in Activity, but in View (or have variable of View type in your scope), there is not need to use WINDOW_SERVICE. Then you can use at least two ways.

First:

DisplayMetrics dm = yourView.getContext().getResources().getDisplayMetrics();

Second:

DisplayMetrics dm = new DisplayMetrics();
yourView.getDisplay().getMetrics(dm);

All this methods we call here is not deprecated.

Answered   2023-09-21 08:07:10

This is not an answer for the OP, as he wanted the display dimensions in real pixels. I wanted the dimensions in "device-independent-pixels", and putting together answers from here https://stackoverflow.com/a/17880012/253938 and here https://stackoverflow.com/a/6656774/253938 I came up with this:

    DisplayMetrics displayMetrics = Resources.getSystem().getDisplayMetrics();
    int dpHeight = (int)(displayMetrics.heightPixels / displayMetrics.density + 0.5);
    int dpWidth = (int)(displayMetrics.widthPixels / displayMetrics.density + 0.5);

Answered   2023-09-21 08:07:10

public class AndroidScreenActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        String str_ScreenSize = "The Android Screen is: "
                                   + dm.widthPixels
                                   + " x "
                                   + dm.heightPixels;

        TextView mScreenSize = (TextView) findViewById(R.id.strScreenSize);
        mScreenSize.setText(str_ScreenSize);
    }
}

Answered   2023-09-21 08:07:10

For getting the screen dimensions use display metrices

DisplayMetrics displayMetrics = new DisplayMetrics();
if (context != null) 
      WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
      Display defaultDisplay = windowManager.getDefaultDisplay();
      defaultDisplay.getRealMetrics(displayMetrics);
    }

Get the height and width in pixels

int width  =displayMetrics.widthPixels;
int height =displayMetrics.heightPixels;

Answered   2023-09-21 08:07:10

I found this did the trick.

Rect dim = new Rect();
getWindowVisibleDisplayFrame(dim);

Answered   2023-09-21 08:07:10

You can do get the height size using :

getResources().getDisplayMetrics().heightPixels;

and the width size using

getResources().getDisplayMetrics().widthPixels; 

Answered   2023-09-21 08:07:10

There is a non-deprecated way to do this using DisplayMetrics (API 1), that avoids the try/catch messiness:

 // initialize the DisplayMetrics object
 DisplayMetrics deviceDisplayMetrics = new DisplayMetrics();

 // populate the DisplayMetrics object with the display characteristics
 getWindowManager().getDefaultDisplay().getMetrics(deviceDisplayMetrics);

 // get the width and height
 screenWidth = deviceDisplayMetrics.widthPixels;
 screenHeight = deviceDisplayMetrics.heightPixels;

Answered   2023-09-21 08:07:10

I would wrap the getSize code like this:

@SuppressLint("NewApi")
public static Point getScreenSize(Activity a) {
    Point size = new Point();
    Display d = a.getWindowManager().getDefaultDisplay();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        d.getSize(size);
    } else {
        size.x = d.getWidth();
        size.y = d.getHeight();
    }
    return size;
}

Answered   2023-09-21 08:07:10

  • This crashes on a emulator running Android 4.0 (API 14). - anyone

For who is searching for usable screen dimension without Status Bar and Action Bar (also thanks to Swapnil's answer):

DisplayMetrics dm = getResources().getDisplayMetrics();
float screen_w = dm.widthPixels;
float screen_h = dm.heightPixels;

int resId = getResources().getIdentifier("status_bar_height", "dimen", "android");
if (resId > 0) {
    screen_h -= getResources().getDimensionPixelSize(resId);
}

TypedValue typedValue = new TypedValue();
if(getTheme().resolveAttribute(android.R.attr.actionBarSize, typedValue, true)){
    screen_h -= getResources().getDimensionPixelSize(typedValue.resourceId);
}

Answered   2023-09-21 08:07:10

Kotlin

fun getScreenHeight(activity: Activity): Int {
    val metrics = DisplayMetrics()
    activity.windowManager.defaultDisplay.getMetrics(metrics)
    return metrics.heightPixels
}

fun getScreenWidth(activity: Activity): Int {
    val metrics = DisplayMetrics()
    activity.windowManager.defaultDisplay.getMetrics(metrics)
    return metrics.widthPixels
}

Answered   2023-09-21 08:07:10

  • Why not use global Resources: Resources.getSystem().displayMetrics.heightPixels - anyone

First load the XML file and then write this code:

setContentView(R.layout.main);      
Display display = getWindowManager().getDefaultDisplay();
final int width = (display.getWidth());
final int height = (display.getHeight());

Show width and height according your screen resolution.

Answered   2023-09-21 08:07:10

Follow the methods below:

public static int getWidthScreen(Context context) {
    return getDisplayMetrics(context).widthPixels;
}

public static int getHeightScreen(Context context) {
    return getDisplayMetrics(context).heightPixels;
}

private static DisplayMetrics getDisplayMetrics(Context context) {
    DisplayMetrics displayMetrics = new DisplayMetrics();
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    wm.getDefaultDisplay().getMetrics(displayMetrics);
    return displayMetrics;
}

Answered   2023-09-21 08:07:10

There are times when you need to know the precise dimensions of the available space for a layout when in an activity's onCreate. After some thought I worked out this way of doing it.

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        startActivityForResult(new Intent(this, Measure.class), 1);
        // Return without setting the layout, that will be done in onActivityResult.
    }

    @Override
    protected void onActivityResult (int requestCode, int resultCode, Intent data) {
        // Probably can never happen, but just in case.
        if (resultCode == RESULT_CANCELED) {
            finish();
            return;
        }
        int width = data.getIntExtra("Width", -1);
        // Width is now set to the precise available width, and a layout can now be created.            ...
    }
}

public final class Measure extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
       // Create a LinearLayout with a MeasureFrameLayout in it.
        // Just putting a subclass of LinearLayout in works fine, but to future proof things, I do it this way.
        LinearLayout linearLayout = new LinearLayout(this);
        LinearLayout.LayoutParams matchParent = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
        MeasureFrameLayout measureFrameLayout = new MeasureFrameLayout(this);
        measureFrameLayout.setLayoutParams(matchParent);
        linearLayout.addView(measureFrameLayout);
        this.addContentView(linearLayout, matchParent);
        // measureFrameLayout will now request this second activity to finish, sending back the width.
    }

    class MeasureFrameLayout extends FrameLayout {
        boolean finished = false;
        public MeasureFrameLayout(Context context) {
            super(context);
        }

        @SuppressLint("DrawAllocation")
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
            if (finished) {
                return;
            }
            finished = true;
            // Send the width back as the result.
            Intent data = new Intent().putExtra("Width", MeasureSpec.getSize(widthMeasureSpec));
            Measure.this.setResult(Activity.RESULT_OK, data);
            // Tell this activity to finish, so the result is passed back.
            Measure.this.finish();
        }
    }
}

If for some reason you don't want to add another activity to the Android manifest, you can do it this way:

public class MainActivity extends Activity {
    static Activity measuringActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        Bundle extras = getIntent().getExtras();
        if (extras == null) {
            extras = new Bundle();
        }
        int width = extras.getInt("Width", -2);
        if (width == -2) {
            // First time in, just start another copy of this activity.
            extras.putInt("Width", -1);
            startActivityForResult(new Intent(this, MainActivity.class).putExtras(extras), 1);
            // Return without setting the layout, that will be done in onActivityResult.
            return;
        }
        if (width == -1) {
            // Second time in, here is where the measurement takes place.
            // Create a LinearLayout with a MeasureFrameLayout in it.
            // Just putting a subclass of LinearLayout in works fine, but to future proof things, I do it this way.
            LinearLayout linearLayout = new LinearLayout(measuringActivity = this);
            LinearLayout.LayoutParams matchParent = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
            MeasureFrameLayout measureFrameLayout = new MeasureFrameLayout(this);
            measureFrameLayout.setLayoutParams(matchParent);
            linearLayout.addView(measureFrameLayout);
            this.addContentView(linearLayout, matchParent);
            // measureFrameLayout will now request this second activity to finish, sending back the width.
        }
    }

    @Override
    protected void onActivityResult (int requestCode, int resultCode, Intent data) {
        // Probably can never happen, but just in case.
        if (resultCode == RESULT_CANCELED) {
            finish();
            return;
        }
        int width = data.getIntExtra("Width", -3);
        // Width is now set to the precise available width, and a layout can now be created. 
        ...
    }

class MeasureFrameLayout extends FrameLayout {
    boolean finished = false;
    public MeasureFrameLayout(Context context) {
        super(context);
    }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (finished) {
            return;
        }
        finished = true;
        // Send the width back as the result.
        Intent data = new Intent().putExtra("Width", MeasureSpec.getSize(widthMeasureSpec));
        MainActivity.measuringActivity.setResult(Activity.RESULT_OK, data);
        // Tell the (second) activity to finish.
        MainActivity.measuringActivity.finish();
    }
}    

Answered   2023-09-21 08:07:10

  • Obviously, you can also pass back the height in the bundle too. - anyone

Much simpler in Kotlin.

val displayMetrics = Resources.getSystem().displayMetrics
displayMetrics.heightPixels
displayMetrics.widthPixels

Answered   2023-09-21 08:07:10

  • This one is very short and precise!! Kudos !! - anyone
  • Watch out - [as others pointed out] this one is only using the static system values, check the source/comments for Resources.getSystem if you wanna make sure this one suits your purpose. - anyone