自定义listView与scrollView使用

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.fuicuiedu.xc.listview_20170222.MainActivity">

<com.fuicuiedu.xc.listview_20170222.MyListView
android:id="@+id/listview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</ScrollView>
</RelativeLayout>

自定义listView

package etest.ll.com.mylistview;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

/**
* 自定义一个可以嵌套在ScrollView中的ListView
*/

public class MyListView extends ListView {
public MyListView(Context context) {
super(context);
}

public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public MyListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

//重写该方法，达到使ListView可以正确的嵌套在ScrollView中
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//自定义绘制规则
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >>2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}

//编写activity

package etest.ll.com.mylistview;

public class MainActivity extends AppCompatActivity {

private ListView mLv;
private List<String> datas;
private ArrayAdapter<String> adapter;
private Handler handler;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

handler = new Handler();

mLv = (ListView) findViewById(R.id.listview);

datas = new ArrayList<>();

//添加假数据
for (int i = 0; i < 50; i++) {
datas.add("第" + i + "条数据");
}

adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,datas);

mLv.setAdapter(adapter);

//动态的设置ListView高度
setListViewHeight(mLv);
}

//动态的设置ListView高度（拿到所有item的高度，设置到listView身上）
private void setListViewHeight(ListView listview) {
//获取listView对应的Adapter
ListAdapter listAdapter = listview.getAdapter();
if (listAdapter == null){
return;
}

int totalHeight = 0;
for (int i = 0; i < listAdapter.getCount(); i++) {
View listItem = listAdapter.getView(i,null,listview);
//计算item的宽高（调用一个绘制的方法）
listItem.measure(0,0);
//统计所有子项的高度
totalHeight += listItem.getMeasuredHeight();
}

//获取分割线的总高度
int dividerHeight = listview.getDividerHeight() * (listAdapter.getCount() - 1);

//拿到listView布局参数
ViewGroup.LayoutParams parms = listview.getLayoutParams();
parms.height= totalHeight + dividerHeight;
listview.setLayoutParams(parms);
}
}

！！adapter使用系统自带的进行演示