1:上佈局代碼;
<?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.example.administrator.myapplication.MainActivity">
<ListView
android:id="@+id/lv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
</RelativeLayout>
2:設置數據;
ArrayList<String> datas = new ArrayList<>();
for (int i = 0; i < 50; i++) {
datas.add("測試數據" + i);
}
ListView listView = (ListView) findViewById(R.id.lv);
listView.setAdapter(new MyBaseAdapter(datas));
3:適配器;
//適配器
private class MyBaseAdapter extends BaseAdapter {
private ArrayList<String> datas;
private MyBaseAdapter(ArrayList<String> datas) {
this.datas = datas;
}
@Override
public int getCount() {
return datas.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView = new TextView(MainActivity.this);
textView.setText(datas.get(position));
textView.setPadding(0, 40, 0, 40);
textView.setGravity(Gravity.CENTER_HORIZONTAL);
return textView;
}
}
3:關鍵的一步,在設置過適配器以後,調用以下方法爲ListView設置高度;
public void setListViewHeightBasedOnChildren(ListView listView) {
// 獲取ListView對應的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);
//計算item的寬高
listItem.measure(0, 0);
//累計所有item的高度
totalHeight += listItem.getMeasuredHeight();
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
params.height = totalHeight + (listView.getDividerHeight()) *(listAdapter.getCount()-1);
listView.setLayoutParams(params);
}