自定义对话框太小

我有一个实现自定义对话框的android活动。应用程序运行正常，但对话框太小，我想显示一个更大的对话框。如何实现此目的？这是我的布局xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
android:orientation="vertical" >

         <LinearLayout 
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
         android:background="@drawable/view_more_borders">

         <LinearLayout 
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:orientation="horizontal"
             android:layout_marginTop="4dp"
             android:gravity="center_vertical">

             <TextView
                 android:id="@+id/share_amount"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_weight="1"
                 android:text="Company Name:"
                 android:textAppearance="?android:attr/textAppearanceSmall"
                 android:textColor="@color/nice_blue"
                 android:typeface="sans" />

            <TextView
                android:id="@+id/textViewCompanyName"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1.80"
                android:text=" "
                android:textAppearance="?android:attr/textAppearanceSmall" />

         </LinearLayout>


         <LinearLayout 
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_marginTop="4dp"
             android:gravity="center_vertical">

             <TextView
                android:id="@+id/textView5"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Price per share:"

                android:textAppearance="?android:attr/textAppearanceSmall"
                android:textColor="@color/nice_blue" />

            <TextView
                android:id="@+id/textViewprice_pershare"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:layout_alignBaseline="@+id/Yesterday"
                android:layout_alignBottom="@+id/Yesterday"
                android:layout_marginLeft="38dp"
                android:fontFamily="sans-serif"
                android:layout_toRightOf="@+id/company"
                android:text=" "
                android:textAppearance="?android:attr/textAppearanceSmall" />
         </LinearLayout>

         <LinearLayout 
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_marginTop="4dp"
             android:gravity="center_vertical">

              <TextView
                    android:id="@+id/textView4"
                  android:layout_width="0dp"
                  android:layout_height="wrap_content"
                  android:layout_weight="1"
                  android:text="Total cost:"

                  android:textAppearance="?android:attr/textAppearanceSmall"
                  android:textColor="@color/nice_blue" />

            <TextView
                android:id="@+id/textview_totalcost"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:layout_alignBaseline="@+id/Yesterday"
                android:layout_alignBottom="@+id/Yesterday"
                android:layout_marginLeft="38dp"
                android:fontFamily="sans-serif"
                android:layout_toRightOf="@+id/company"
                android:text=" "
                android:textAppearance="?android:attr/textAppearanceSmall" />
         </LinearLayout>


         <LinearLayout 
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_marginTop="4dp"
             android:gravity="center_vertical">

                 <TextView
            android:id="@+id/textView3"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
                     android:layout_weight="1"
                     android:text="Number of shares:"

                     android:textAppearance="?android:attr/textAppearanceSmall"
                     android:textColor="@color/nice_blue" />

            <EditText
                android:id="@+id/shareNumber"
                android:layout_width="0dp"
                android:layout_weight="2"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:fontFamily="sans-serif"
                android:textSize="12sp"
                 >

            <requestFocus />
            </EditText>
         </LinearLayout>

         <LinearLayout 
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_marginTop="4dp"
             android:gravity="center_vertical">


              <TextView
        android:id="@+id/textView2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Payment method:"

                android:textAppearance="?android:attr/textAppearanceSmall"
                android:textColor="@color/nice_blue" />

             <Spinner
                 android:id="@+id/spinner_paymentmode"
                 android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_weight="2" />

         </LinearLayout>   
     </LinearLayout>
     <Button
    android:id="@+id/button_buy_shares"
    style="@style/ButtonText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/blue_button"
    android:text="Buy" />

这是我的输出。我想增加对话框的宽度和高度。

和我的java文件

public class MyDialogFragment extends DialogFragment {

public MyDialogFragment() {

}

private EditText mEditText;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.dialogfragment, container);
    // mEditText = (EditText) view.findViewById(R.id.txt_your_name);
    // getDialog().setTitle("Hello");
    getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);

    return view;
}
}