Android屏幕相關輔助類 ScreenUtils

 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;

/**

獲得屏幕相關的輔助類 


*/

public class ScreenUtils

{

private ScreenUtils()

{

/* cannot be instantiated */  
throw new UnsupportedOperationException("cannot be instantiated");  

}
/**

獲得屏幕高度 

@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;

}  

/**

獲得屏幕寬度 

@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;

}  

/**

獲得狀態欄的高度 

@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;

}


/**

獲取當前屏幕截圖，包含狀態欄 

@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;  

}
/**

獲取當前屏幕截圖，不包含狀態欄 

@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;


}


}  </pre>