【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=""

            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=""

            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 *  / ;

//                linearParams.gravity = Gravity.CENTER_VERTICAL;

                ll.setLayoutParams(linearParams);

                view.setTag(holder);

            } else {

                holder = (ViewHolder) view.getTag();

            }