獲得屏幕相關的Android輔助類

    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>