//獲取螢幕的1/3寬度 Display display = getWindow().getWindowManager().getDefaultDisplay();//獲得整個螢幕 DisplayMetrics outMetrics = new DisplayMetrics(); display.getMetrics(outMetrics); int mScreen1_3 =outMetrics.widthPixels/3;//橫屏的1/3 ImageView mTabLine = new ImageView(MainActivity.this); //設定Tab的寬度為整屏的1/3 ViewGroup.LayoutParams lp = mTabLine.getLayoutParams(); lp.width = mScreen1_3; mTabLine.setLayoutParams(lp);