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getWindow().setLayout(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

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WindowManager m = getWindowManager();
Display d = m.getDefaultDisplay(); // Ϊ»ñÈ¡ÆÁÄ»¿í¡¢¸ß
android.view.WindowManager.LayoutParams p =           
                            getWindow().getAttributes(); 
p.width = d.getWidth(); // ¿í¶ÈÉèÖÃΪÆÁÄ»µÄ0.7
getWindow().setAttributes(p);