android gets the implementation of the screen height and width

This article illustrates how android gets the height and width of the screen. Share to everybody for everybody reference. The specific analysis is as follows:

We need to get the physical size of the Android phone or Pad screen for interface design or other functions. So let's talk about lecture 1 how do you get the physical size of the screen

The following code gets the screen size.
In the onCreate method of 1 Activity, write the following code:

DisplayMetrics metric = new DisplayMetrics();  

   getWindowManager().getDefaultDisplay().getMetrics(metric);  

   int width = metric.widthPixels;     //  Screen width (pixels)   

   int height = metric.heightPixels;   //  Screen height (pixels)   

   float density = metric.density;      //  Screen density ( 0.75 / 1.0 / 1.5 )   

   int densityDpi = metric.densityDpi;  //  The density of the screen DPI ( 120 / 160 / 240 ) 

However, it should be noted that on a low density small screen phone, the above code alone will not get the correct size. For example, a 240x320 pixel low-density phone running this code will get a screen size of 320x427. Therefore, it was found that without multi-resolution support, the Android system would convert the low-density (120) size of 240x320 to the medium-density (160) size, which would greatly affect the coding of the program. Therefore, it is necessary to add ES22en-ES23en node into the AndroidManifest. xml file of the project, and the specific content is as follows:

<supports-screens  

   android:smallScreens="true"  

   android:normalScreens="true"  

   android:largeScreens="true"  

   android:resizeable="true"  

   android:anyDensity="true" />

This way, the current Android program supports multiple resolutions, so you get the correct physical size.

import android.app.Activity;  

import android.os.Bundle;  

import android.util.DisplayMetrics;  

import android.widget.TextView;  

public class TextCanvasActivity extends Activity {  

    public void onCreate(Bundle savedInstanceState) {  

          super.onCreate(savedInstanceState);  

        //setContentView(new MyView(this));  

            

        // define DisplayMetrics  object     

         setContentView(R.layout.main);    

         DisplayMetrics  dm = new DisplayMetrics();    

        // Get window properties     

         getWindowManager().getDefaultDisplay().getMetrics(dm);    

          

        // Window width     

         int screenWidth = dm.widthPixels;    

         

        // Window height     

         int screenHeight = dm.heightPixels;           

         TextView textView = (TextView)findViewById(R.id.tv1);           

         textView.setText(" The width of the screen : " + screenWidth + "\n Screen height:  " + screenHeight);   

    }  

}

Hopefully, this article has been helpful in your Android programming.