如何获得屏幕的宽度和高度

I tried to use following code to get screen width and height in android app development:

我尝试用下面的代码在android app开发中获取屏幕的宽度和高度:

Display display = getWindowManager().getDefaultDisplay(); 
int screenWidth = display.getWidth();
int screenHeight = display.getHeight();

but I got NullPointerException for my display, why? how to get screen width and height then?

但是我的显示有NullPointerException，为什么?那么如何得到屏幕的宽度和高度呢?

13 个解决方案

#1

124

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:

如果您在活动之外调用它，则需要传入上下文(或者通过其他调用获得上下文)。然后使用它来获取显示度量:

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

UPDATE: With API level 17+, you can use getRealSize:

更新:使用API级别17+，可以使用getRealSize:

Point displaySize = new Point();
activity.getWindowManager().getDefaultDisplay().getRealSize(displaySize);

If you want the available window size, you can use getDecorView to calculate the available area by subtracting the decor view size from the real display size:

如果您想要可用的窗口大小，可以使用getDecorView从实际显示大小中减去装饰视图大小来计算可用的区域:

Point displaySize = new Point();
activity.getWindowManager().getDefaultDisplay().getRealSize(displaySize);

Rect windowSize = new Rect();
ctivity.getWindow().getDecorView().getWindowVisibleDisplayFrame(windowSize);

int width = displaySize.x - Math.abs(windowSize.width());
int height = displaySize.y - Math.abs(windowSize.height());
return new Point(width, height);

getRealMetrics may also work (requires API level 17+), but I haven't tried it yet:

getRealMetrics也可以工作(需要API级别17+)，但是我还没有尝试过:

DisplayMetrics metrics = new DisplayMetrics();
activity.GetWindowManager().getDefaultDisplay().getRealMetrics(metrics);

#2

Within an activity, you can call:

在活动中，您可以调用:

int width = this.getResources().getDisplayMetrics().widthPixels;
int height = this.getResources().getDisplayMetrics().heightPixels;

When you're in a View, then you need to get the Context first:

当你在一个视图中，那么你需要首先获得上下文:

int width = getApplicationContext().getResources().getDisplayMetrics().widthPixels;
int height = getApplicationContext().getResources().getDisplayMetrics().heightPixels;

This will work in all Android version, available since API 1, and never deprecated.

这将适用于所有的Android版本，从API 1开始就可以使用，并且不会被弃用。

#3

From service:

从服务:

Display  display= ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int width = display.getWidth(); 
int height = display.getHeight();

#4

This is what finally worked for me:

这就是最终对我起作用的:

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

#5

Try via context.getResources().getDisplayMetrics() if you have a context available.

如果您有可用的上下文，可以通过context. getresources (). getdisplaymetrics()进行尝试。

#6

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

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

i guess the code which you wrote is deprecated.

我想您写的代码是不赞成的。

#7

if (Build.VERSION.SDK_INT >= 11) {
        Point size = new Point();
        try {
            this.getWindowManager().getDefaultDisplay().getRealSize(size);
            screenWidth = size.x;
            screenHeight = size.y;
        } catch (NoSuchMethodError e) {
             screenHeight = this.getWindowManager().getDefaultDisplay().getHeight();
             screenWidth=this.getWindowManager().getDefaultDisplay().getWidth();
        }

    } else {
        DisplayMetrics metrics = new DisplayMetrics();
        this.getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenWidth = metrics.widthPixels;
        screenHeight = metrics.heightPixels;
    }

#8

Try with the following code to get width and height of screen

试试下面的代码来获得屏幕的宽度和高度。

int widthOfscreen =0;
int heightOfScreen = 0;
DisplayMetrics dm = new DisplayMetrics();
        try {
            ((Activity) context).getWindowManager().getDefaultDisplay()
                    .getMetrics(dm);
        } catch (Exception ex) {
        }
         widthOfscreen  = dm.widthPixels;
heightOfScreen  = dm.heightPixels;

#9

WindowManager w = getWindowManager();
Display d = w.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
d.getMetrics(metrics);

Log.d("WIDTH: ", String.valueOf(d.getWidth()));
Log.d("HEIGHT: ", String.valueOf(d.getHeight()));

#10

       /*
        *DisplayMetrics: A structure describing general information about a display, such as its size, density, and font scaling.
        * */

 DisplayMetrics metrics = getResources().getDisplayMetrics();

       int DeviceTotalWidth = metrics.widthPixels;
       int DeviceTotalHeight = metrics.heightPixels;

#11

    int scrWidth  = getWindowManager().getDefaultDisplay().getWidth();
    int scrHeight = getWindowManager().getDefaultDisplay().getHeight();

#12

Display display = getActivity().getWindowManager().getDefaultDisplay(); 
int screenWidth = display.getWidth();
int screenHeight = display.getHeight();
Log.d("Tag", "Getting Width >> " + screenWidth);
Log.d("Tag", "Getting Height >> " + screenHeight);

This worked properly in my application

这在我的应用程序中运行得很好

#13

Alternative way using function

替代方法使用函数

private int[] getScreenSIze(){
        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
        int h = displaymetrics.heightPixels;
        int w = displaymetrics.widthPixels;

        int[] size={w,h};
        return size;

    }

on button click or on your create function add the following code

在按钮上单击或在创建函数上添加以下代码

int[] screenSize= getScreenSIze();
        int width=screenSize[0];
        int height=screenSize[1];
        screenSizes.setText("Phone Screen sizes \n\n  width = "+width+" \n Height = "+height);

See demo source code

看到演示源代码

#1

124