【Android多屏适配】动态改变Listview item高度

在ListView的Adapter中去直接获取传入View的LayoutParams是会报空指针异常的，唯一的方法是在xml中嵌套布局一层LinearLayout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:background="@drawable/subject_item_bg"
android:orientation="vertical" >
<!-- 这层需要嵌套 -->
<LinearLayout
android:id="@+id/subject_ll"
android:layout_width="fill_parent"
android:layout_height="120dp"
android:orientation="vertical" >

<ImageView
android:id="@+id/subject_ico"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="17"
android:layout_margin="5dp"
android:scaleType="fitXY"
android:src="@drawable/woji" />

<TextView
android:id="@+id/subject_title"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="5"
android:layout_marginLeft="10dp"
android:singleLine="true"
android:text="曾经啊减肥的撒飞机 合集合集合集肥的撒飞机 合肥的撒飞机 合"
android:textColor="#000000"
android:textSize="18sp" />
</LinearLayout>

</LinearLayout>

然后再在Adapter的getView中去动态改变即可，关键代码：

if (view == null) {
view = getActivity().getLayoutInflater().inflate(
R.layout.subject_list_item, null);
holder = new ViewHolder();
LinearLayout ll = (LinearLayout)view.findViewById(R.id.subject_ll);
holder.tvTitle = (TextView) view
.findViewById(R.id.subject_title);
holder.imgIco = (ImageView) view.findViewById(R.id.subject_ico);

LayoutParams linearParams = (LayoutParams) ll
.getLayoutParams();
linearParams.height = screenWidth * 250 / 460;
//                linearParams.gravity = Gravity.CENTER_VERTICAL;
ll.setLayoutParams(linearParams);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}