11

在我的代码中,我有一个具有多个子布局的 XML 文件。A而且我只想根据设备的屏幕宽度以编程方式设置这些子布局的宽度之一。到目前为止,我已经尝试过 Layout params、setparam 和其他方法,但它在获取布局 id 时显示空指针异常。

我的父布局是相对布局,第一个子布局是线性布局(“对于这个布局,我需要改变宽度”)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/parentlayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout
        android:id="@+id/childlayout"
        android:layout_width="250dip"
        android:layout_height="fill_parent"
        android:orientation="vertical" 
        android:background="#153746">
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:background="@drawable/sub_title"
            android:gravity="center_vertical" >
            <TextView
                android:id="@+id/menu_header_label"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textStyle="bold"
                android:text="asd"
                android:textColor="#ffffff"
                android:layout_marginLeft="10dip" />

            <ImageView
                android:id="@+id/menu_header"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal" />
        </LinearLayout>
        <ListView
            android:id="@+id/menu_listview"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:divider="@android:color/darker_gray"
            android:dividerHeight="1dip"
            android:scrollingCache="false" />
    </LinearLayout>

    <FrameLayout
        android:id="@+id/overlay"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </FrameLayout>

</LinearLayout>

Java代码:-

     public class SlideMenu extends LinearLayout {

    // keys for saving/restoring instance state
    public final static String KEY_MENUSHOWN = "menuWasShown";
    private final static String KEY_STATUSBARHEIGHT = "statusBarHeight";
    private final static String KEY_SUPERSTATE = "superState";

//  Display display = ((WindowManager) getWindowToken()).getDefaultDisplay(); 
//  int width = display.getWidth();  // deprecated
//  int height = display.getHeight();  // deprecated
//  float layWidth = (width*70)/100;
//  
////    LinearLayout view= (LinearLayout)findViewById(R.id.childlayout);
////    LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
////    params.width = 130;
////    view.setLayoutParams(params);
//  view.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, theSizeIWant));

    public static class SlideMenuItem {
        public int id;
        public Drawable icon;
        public String label;
    } 

这是我的代码片段,我评论了到目前为止我尝试过的部分并得到了任何好的结果..``

4

2 回答 2

12

你可以这样做:将 id 设置为此子线性布局,然后:

LinearLayout linLayout = (LinearLayout) findViewById(R.id.yourID);
LinearLayout .LayoutParams layoutParams= new 
LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 
LinearLayout.LayoutParams.MATCH_PARENT);//or whatever , you can set the width and height programmatically and then setLayoutParams()

编辑:

我看你已经试过了,对不起。但是有两个线性布局不是吗?

于 2012-12-05T10:38:00.537 回答
6

把它放在java代码中:

int width = 300;
int height = LayoutParams.WRAP_CONTENT;
LinearLayout childLayout = (LinearLayout) findViewById(R.id.childLayout);
childLayout.setLayoutParams(new LayoutParams(width, height));
于 2012-12-05T10:40:29.850 回答