本帖最后由 我是楠楠 于 2017-11-28 10:01 编辑
可直接使用的刷新加载的自定义listviewONE Goal, ONE Passion!
每个项目中基本都会用到刷新,加载的功能.而且用的最多的就是PullRefrushListView开源框架,使用时每次还要导jar,用起来是挺好的,就是不想导包,那就自己写吧. 自定义MyListView 继承至ListView[AppleScript] 纯文本查看 复制代码 public class MyListView extends ListView {
Context mContext;
View headerView;//头布局
private View header_textView;//头布局中的textview
View footerView;//脚布局
private View footer_textView;//脚布局中的textview
int totalItemCount;// 总数量；
int lastVisibleItem;// 最后一个可见的item；
public MyListView(Context context) {
super(context,0);
}
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs,null);
}
public MyListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.mContext = context;
initView();
}
private void initView() {
LayoutInflater inflater = LayoutInflater.from(mContext);
//为Listview加载头布局
headerView = inflater.inflate(R.layout.header_layout, null);
header_textView = headerView.findViewById(R.id.header_view);
final Animation animation = AnimationUtils.loadAnimation(mContext, R.anim.rotate);
// header_textView.startAnimation(animation); //开始动画
header_textView.setVisibility(View.GONE);
this.addHeaderView(headerView);
//为Listview加载脚布局
footerView = inflater.inflate(R.layout.footer_layout, null);
footer_textView = footerView.findViewById(R.id.footer_layout);
// footer_textView.startAnimation(animation); //开始动画
footer_textView.setVisibility(View.GONE);
this.addFooterView(footerView);
}
int downY;
int moveY;
//防止多次触发move事件,所以在up事件中请求数据
boolean load_state = false;//加载的状态(开始加载)
boolean refresh_state = false;//开始刷新的状态(开始刷新)
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downY = (int) ev.getY();
break;
case MotionEvent.ACTION_MOVE:
moveY = (int) ev.getY();
//如果显示的是第一条则刷新数据
if (getFirstVisiblePosition() == 0) {
if ((moveY - downY) > 200) {
//让下拉刷新框显示
header_textView.setVisibility(View.VISIBLE);
refresh_state = true;
}
} else if (getLastVisiblePosition() == (getCount() - 1) && moveY - downY < -200) {
//如果是最后一个条目的话就加载更多
footer_textView.setVisibility(View.VISIBLE);
load_state = true;
}
break;
case MotionEvent.ACTION_UP:
if (refresh_state) {
mlistener.onRefresh();
}
if (load_state) {
mlistener.onLoadMore();
}
break;
}
return super.onTouchEvent(ev);
}
/**
* 当刷新完成是调用,以便更改一些标志符
*/
public void GetedRefreshData() {
header_textView.setVisibility(View.GONE);
refresh_state = false;
}
/*
* 当加载完成是调用,以便更改一些标志符
*/
public void GetedMoreData() {
footer_textView.setVisibility(View.GONE);
load_state = false;
}
public void setIOnPullListener(IOnPullListener listener) {
this.mlistener = listener;
}
IOnPullListener mlistener;
public interface IOnPullListener {
void onLoadMore();
void onRefresh();
}
}
使用到的一些资源:1,头布局header_layout.xml [AppleScript] 纯文本查看 复制代码 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/header_view"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="@drawable/dengdai" />
</LinearLayout>2,脚布局footer_layout.xml [AppleScript] 纯文本查看 复制代码 <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/footer_layout"
android:layout_width="40dp"
android:layout_height="40dp"
android:background="@drawable/dengdai" />
</LinearLayout>3,动画资源 [AppleScript] 纯文本查看 复制代码 <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="@android:anim/linear_interpolator">
<rotate
android:duration="6000"
android:fromDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:toDegrees="1080" />
</set>4,为头或脚布局添加动画: [AppleScript] 纯文本查看 复制代码 Animation animation = AnimationUtils.loadAnimation(mContext, R.anim.rotate);
//header_textView为布局中需要执行动画的组件
header_textView.startAnimation(animation); //开始动画
ListActivity 的java代码: [AppleScript] 纯文本查看 复制代码 public class ListActivity extends AppCompatActivity {
MyListView lv;
List<String> mList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
initDatas();
initView();
}
private void initView() {
lv = (MyListView) findViewById(R.id.lv);
adapter = new myAdapter(mList);
lv.setAdapter(adapter);
lv.setVerticalScrollBarEnabled(false);
lv.setIOnPullListener(new MyListView.IOnPullListener() {
@Override
public void onLoadMore() {
mList.add(需要加载更多的数据);
lv.GetedMoreData();
adapter.notifyDataSetChanged();
}
@Override
public void onRefresh() {
mList.add(0, 刷新需要更新的数据);
lv.GetedRefreshData();
adapter.notifyDataSetChanged();
}
});
}
private void initDatas() {
mList = new ArrayList<>();
for (int i = 'A'; i <= 'G'; i++) {
mList.add("" + (char) i);
}
}
myAdapter adapter;
class myAdapter extends BaseAdapter {
List<String> listData;
myAdapter(List<String> list) {
this.listData = list;
}
@Override
public int getCount() {
return listData.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) {
holder = null;
if (convertView == null) {
holder = new myViewHolder();
convertView = getLayoutInflater().inflate(R.layout.item_simple, null);
holder.tv = (TextView) convertView.findViewById(R.id.tv);
convertView.setTag(holder);
} else {
holder = (myViewHolder) convertView.getTag();
}
holder.tv.setText(listData.get(position) + "");
return convertView;
}
}
myViewHolder holder;
class myViewHolder {
TextView tv;
}
}activity_list.xml布局文件: [AppleScript] 纯文本查看 复制代码 <?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.activity.ListActivity">
<com.example.view.MyListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent">
</com.example.view.MyListView>
</RelativeLayout>滑动条 [AppleScript] 纯文本查看 复制代码 //listview不显示滑动条
lv.setVerticalScrollBarEnabled(false); 分割线 [AppleScript] 纯文本查看 复制代码 // 此属性可设置分割线的样式
android:divider="@drawable/"
//不使用分割线
android:divider="null"
![]()
传智播客·黑马程序员郑州校区地址 河南省郑州市 高新区长椿路11号大学科技园（西区）东门8号楼三层 联系电话 0371-56061160/61/62 来校路线 地铁一号线梧桐街站A口出
| 
收藏
淘帖
踩
