how to get total screen size on an android device programmatically

问题

if i use the code shown here to get the total screen size it is always short on height to the total screen size as shown in the documented specs for the device. for example I tried to get the screen size by using the code to get the size for a tablet listed as 1280 X 800 and the result from the code is: 1216 X 800. so where is the missing 64 pixels going to?

i can guess that it could be the bar at the bottom of the screen that holds the back and home buttons. but that does not sound right as the content views is supposed to be the root of all views. what is going on here?

the only possible explanation could be this part of the UI

code used to get screen size

  // gets the content view windows width and height size
   DisplayMetrics displaymetrics = new DisplayMetrics();
   getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
   int widthContentView = displaymetrics.widthPixels;
   int heightContentView = displaymetrics.heightPixels;
   Toast.makeText(MainActivity.this, "width of content view: " + widthContentView  Toast.LENGTH_SHORT).show();
   Toast.makeText(MainActivity.this, "height of content view: " + heightContentView, Toast.LENGTH_SHORT).show();

回答1:

If you're calling this outside of an Activity, you'll need to pass the context in (or get it through some other call). Then use that to get your display metrics:

DisplayMetrics metrics = context.getResources().getDisplayMetrics();
int width = metrics.widthPixels;
int height = metrics.heightPixels;

回答2:

I'm not sure what api you use but if you use api starting from 17 you can use this:

display.getRealSize();

回答3:

try this code...

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


it will give screen's width and height,And according to width and height write if-    conditions for each device's screen resolution.

回答4:

int screenSize = getResources().getConfiguration().screenLayout &
    Configuration.SCREENLAYOUT_SIZE_MASK;

switch(screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
    Toast.makeText(this, "Large screen",Toast.LENGTH_LONG).show();
    break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
    Toast.makeText(this, "Normal screen",Toast.LENGTH_LONG).show();
    break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
    Toast.makeText(this, "Small screen",Toast.LENGTH_LONG).show();
    break;
default:
    Toast.makeText(this, "Screen size is neither large, normal or small" ,  Toast.LENGTH_LONG).show();
}

回答5:

You are right, It is showing you the resolution of your app screen and hence you getting the difference.Instead of getMetrics(), use getRealMetrics(). You can use the following code to get the actual screen size of device.

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

    DisplayMetrics metrics = new DisplayMetrics();
    display.getRealMetrics(metrics);
    int width = metrics.widthPixels;
    int height = metrics.heightPixels;

    return width + "*" + height;

回答6:

int density;
    private DisplayMetrics metrics;
    private int widthPixels;
    private float scaleFactor;
    private float widthDp;
metrics = new DisplayMetrics();
                getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

                density= getResources().getDisplayMetrics().densityDpi;

                widthPixels = metrics.widthPixels;

                scaleFactor = metrics.density;

                widthDp = widthPixels / scaleFactor;
System.out.println("widthDp== "+widthDp );
if(density==DisplayMetrics.DENSITY_HIGH)
                        System.out.println("Density is high");

                    if(density==DisplayMetrics.DENSITY_XXHIGH)
                        System.out.println("Density is xxhigh");

                    if(density==DisplayMetrics.DENSITY_XXXHIGH)
                        System.out.println("Density is xxxhigh");

                    if(density==DisplayMetrics.DENSITY_TV)
                        System.out.println("Density is Tv");

回答7:

    int Measuredwidth = 0;
    int Measuredheight = 0;
    Point size = new Point();
    WindowManager w = getWindowManager();

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

回答8:

Get all Display set your width and height as you required.

    Display display;
    display=getWindowManager().getDefaultDisplay();
    text1.setWidth(display.getWidth()-380);
    text1.setHeight(display.getHeight()-720);

来源：https://stackoverflow.com/questions/20262972/how-to-get-total-screen-size-on-an-android-device-programmatically

标签

android

user-interface

screen