/**
 * 螢幕相關的輔助類
 * 
 * @since 2015-05-27
 * @author lixi
 */
public class ScreenUtils {

    private ScreenUtils() {
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * 獲得螢幕高度
     */
    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;
    }

    /**
     * 獲得螢幕寬度
     */
    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;
    }

    /**
     * 獲得狀態列的高度
     */
    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;
    }

    /**
     * 獲取當前螢幕截圖，包含狀態列
     */
    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;

    }

    /**
     * 獲取當前螢幕截圖，不包含狀態列
     */
    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;
    }


    /**
     * 應用activity介面截圖
     * @param activity
     * @param shareBtn 去除activity介面底部要不顯示的元件
     * @param sportDate 運動日期元件
     * @return
     */
    public static Bitmap takeScreenShot(RelativeLayout topView,Activity activity, FrameLayout shareBtn, LinearLayout sportDate) {
        // 螢幕截圖,通過設定隱藏，截圖，再顯示的方式，去掉頭部，尾部的ui顯示
        topView.setVisibility(View.INVISIBLE);
        shareBtn.setVisibility(View.INVISIBLE);
        sportDate.setVisibility(View.VISIBLE);
        View view = activity.getWindow().getDecorView();
        view.setDrawingCacheEnabled(true);
        view.buildDrawingCache();
        Bitmap b1 = view.getDrawingCache();
        shareBtn.setVisibility(View.VISIBLE);
        sportDate.setVisibility(View.INVISIBLE);
        topView.setVisibility(View.VISIBLE);

        // 獲取狀態列高度
        Rect frame = new Rect();
        activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
        int statusBarHeight = frame.top;


        // 獲取螢幕長和高
        int width = activity.getWindowManager().getDefaultDisplay().getWidth();
        int height = activity.getWindowManager().getDefaultDisplay()
                .getHeight();
        // 去掉標題欄
        Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight,width,height-statusBarHeight );
        view.destroyDrawingCache();
        return b;
    }
}