Android 开发工具类 07_ScreenUtils

获得屏幕相关的辅助类：

1、获得屏幕高度；

2、获得屏幕宽度；

3、获得状态栏的高度；

4、获取当前屏幕截图，包含状态栏；

5、获取当前屏幕截图，不包含状态栏。

 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Rect;
 import android.util.DisplayMetrics;
 import android.view.View;
 import android.view.WindowManager;

 // 获得屏幕相关的辅助类
 public class ScreenUtils
 {
     private ScreenUtils()
     {
         /* cannot be instantiated */
         throw new UnsupportedOperationException("cannot be instantiated");
     }

     /**
      * 获得屏幕高度
      *
      * @param context
      * @return
      */
     public static int getScreenWidth(Context context)
     {
         WindowManager wm = (WindowManager) context
                 .getSystemService(Context.WINDOW_SERVICE);
         DisplayMetrics outMetrics = new DisplayMetrics();
         wm.getDefaultDisplay().getMetrics(outMetrics);
         return outMetrics.widthPixels;
     }

     /**
      * 获得屏幕宽度
      *
      * @param context
      * @return
      */
     public static int getScreenHeight(Context context)
     {
         WindowManager wm = (WindowManager) context
                 .getSystemService(Context.WINDOW_SERVICE);
         DisplayMetrics outMetrics = new DisplayMetrics();
         wm.getDefaultDisplay().getMetrics(outMetrics);
         return outMetrics.heightPixels;
     }

     /**
      * 获得状态栏的高度
      *
      * @param context
      * @return
      */
     public static int getStatusHeight(Context context)
     {

         int statusHeight = -1;
         try
         {
             Class<?> clazz = Class.forName("com.android.internal.R$dimen");
             Object object = clazz.newInstance();
             int height = Integer.parseInt(clazz.getField("status_bar_height")
                     .get(object).toString());
             statusHeight = context.getResources().getDimensionPixelSize(height);
         } catch (Exception e)
         {
             e.printStackTrace();
         }
         return statusHeight;
     }

     /**
      * 获取当前屏幕截图，包含状态栏
      *
      * @param activity
      * @return
      */
     public static Bitmap snapShotWithStatusBar(Activity activity)
     {
         View view = activity.getWindow().getDecorView();
         view.setDrawingCacheEnabled(true);
         view.buildDrawingCache();
         Bitmap bmp = view.getDrawingCache();
         int width = getScreenWidth(activity);
         int height = getScreenHeight(activity);
         Bitmap bp = null;
         bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
         view.destroyDrawingCache();
         return bp;

     }

     /**
      * 获取当前屏幕截图，不包含状态栏
      *
      * @param activity
      * @return
      */
     public static Bitmap snapShotWithoutStatusBar(Activity activity)
     {
         View view = activity.getWindow().getDecorView();
         view.setDrawingCacheEnabled(true);
         view.buildDrawingCache();
         Bitmap bmp = view.getDrawingCache();
         Rect frame = new Rect();
         activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
         int statusBarHeight = frame.top;

         int width = getScreenWidth(activity);
         int height = getScreenHeight(activity);
         Bitmap bp = null;
         bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
                 - statusBarHeight);
         view.destroyDrawingCache();
         return bp;

     }
 }