Android中获取手机屏幕大小的方法

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  > 
  <TextView  
   android:id="@+id/tv"  
   android:layout_width="fill_parent"  
   android:layout_height="wrap_content"  
   android:text="手机分辨率为:"/> 
  <Button 
    android:id="@+id/btnOK" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="获取手机分辨率"/> 
</LinearLayout> 

public class TestActivity extends Activity { 
     
  private TextView tv; 
  private Button btn; 
   
  //获取手机屏幕分辨率的类 
   private DisplayMetrics dm; 
   
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main);  
     
    tv = (TextView)findViewById(R.id.tv); 
    btn = (Button)findViewById(R.id.btnOK); 
    btn.setOnClickListener(new View.OnClickListener() { 
       
     public void onClick(View v) { 
       dm = new DisplayMetrics(); 
     getWindowManager().getDefaultDisplay().getMetrics(dm); 
         //获得手机的宽度和高度像素单位为px 
     String strPM = "手机屏幕分辨率为:" + dm.widthPixels+"* "+dm.heightPixels; 
     tv.setText(strPM); 
      } 
    }); 
  } 
  
}