• 一種方法是在dialog的onCreate里面加上

private void initWindow() {
        Window win = this.getWindow();
        win.getDecorView().setPadding(0, 0, 0, 0);
        WindowManager.LayoutParams lp = win.getAttributes();

        lp.width = WindowManager.LayoutParams.MATCH_PARENT;
        lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
        lp.gravity = Gravity.BOTTOM;
        win.setAttributes(lp);  
    }

但是這么改是在自定義的繼承自dialog里面才能這么寫
有時我們可能只是簡單的，這樣寫

final AlertDialog dialog = new AlertDialog.Builder(activity,R.style.dialog)
                .setView(view1)
                .create();
        dialog.show();

• 那么就是第二種方法，在dialog.show()之后再調(diào)用以下的代碼

Window window = dialog.getWindow();
        WindowManager.LayoutParams lp = window.getAttributes();
        lp.width = WindowManager.LayoutParams.MATCH_PARENT;
        lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
        lp.gravity = Gravity.BOTTOM;
        dialog.onWindowAttributesChanged(lp);
        window.setAttributes(lp);