Android：自动刷新列表视图的位置和方式（我有刷新功能）
这是我的主要活动，我真的需要帮助创建一个功能，将自动刷新列表视图每分钟 在我的主要活动中，我有以下代码：Android：自动刷新列表视图的位置和方式（我有刷新功能）,android,Android,这是我的主要活动，我真的需要帮助创建一个功能，将自动刷新列表视图每分钟 在我的主要活动中，我有以下代码： //This method is called when swipe refresh is pulled down @Override public void onRefresh() { fetchOrders(); } 我已经读了一些关于处理程序的文章，我得说我不知道把处理程序的代码放在哪里，因此如果你能帮我一把，并把我完整的main活动
//This method is called when swipe refresh is pulled down
@Override
public void onRefresh() {
fetchOrders();
}
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
private int mInterval = 5000; // 5 seconds by default, can be changed later
private Handler mHandler;
private String TAG = MainActivity.class.getSimpleName();
private String URL = "http://troyka.esy.es/troyka/orders.php";
private SwipeRefreshLayout swipeRefreshLayout;
private ListView listView;
private SwipeListAdapter adapter;
private List<Order> orderList;
// initially offset will be 0, later will be updated while parsing the json
private int offSet = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
//RelativeLayout.LayoutParams layout_description = new RelativeLayout.LayoutParams(50,10);
//Rl.setLayoutParams(layout_description);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
orderList = new ArrayList<>();
adapter = new SwipeListAdapter(this, orderList);
listView.setAdapter(adapter);
swipeRefreshLayout.setOnRefreshListener(this);
/**
* Showing Swipe Refresh animation on activity create
* As animation won't start on onCreate, post runnable is used
*/
swipeRefreshLayout.post(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(true);
fetchOrders();
}
}
);
mHandler = new Handler();
startRepeatingTask();
}
Runnable mStatusChecker = new Runnable() {
@Override
public void run() {
//updateStatus(); //this function can change value of mInterval.
mHandler.postDelayed(mStatusChecker, mInterval);
}
};
void startRepeatingTask() {
mStatusChecker.run();
}
void stopRepeatingTask() {
mHandler.removeCallbacks(mStatusChecker);
}
/**
* This method is called when swipe refresh is pulled down
*/
@Override
public void onRefresh() {
fetchOrders();
}
/**
* Fetching movies json by making http call
*/
private void fetchOrders() {
// showing refresh animation before making http call
swipeRefreshLayout.setRefreshing(true);
// appending offset to url
String url = URL + offSet;
// Volley's json array request object
JsonArrayRequest req = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
if (response.length() > 0) {
// looping through json and adding to order list
for (int i = 0; i < response.length(); i++) {
try {
JSONObject orderObj = response.getJSONObject(i);
int rank = orderObj.getInt("rank");
String title = orderObj.getString("title");
Order m = new Order(rank, title);
orderList.add(0, m);
// updating offset value to highest value
if (rank >= offSet)
offSet = rank;
} catch (JSONException e) {
Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
adapter.notifyDataSetChanged();
}
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Server Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
});
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(req);
}
}
public类MainActivity扩展AppCompatActivity实现SwipeRefreshLayout.OnRefreshListener{
private int mInterval=5000；//默认为5秒，可以稍后更改
私人经理人；
私有字符串标记=MainActivity.class.getSimpleName（）；
专用字符串URL=”http://troyka.esy.es/troyka/orders.php";
私人SwipeRefreshLayout SwipeRefreshLayout；
私有列表视图列表视图；
专用SwipeListAdapter适配器；
私有列表订单列表；
//初始偏移量为0，稍后在解析json时更新
私有整数偏移=0；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
listView=（listView）findViewById（R.id.listView）；
//RelativeLayout.LayoutParams布局\ U描述=新的RelativeLayout.LayoutParams（50,10）；
//Rl.setLayoutParams（布局描述）；
swipeRefreshLayout=（swipeRefreshLayout）findViewById（R.id.swipe\u refresh\u layout）；
orderList=新的ArrayList（）；
适配器=新SwipeListAdapter（此为订单列表）；
setAdapter（适配器）；
swipeRefreshLayout.setOnRefreshListener（此）；
/**
*在“创建活动”上显示滑动刷新动画
*由于动画不会在onCreate上启动，因此会使用post runnable
*/
swipeRefreshLayout.post（新的Runnable（）{
@凌驾
公开募捐{
swipeRefreshLayout.setRefreshing（true）；
fetchOrders（）；
}
}
);
mHandler=新处理程序（）；
startRepeatingTask（）；
}
Runnable mStatusChecker=new Runnable（）{
@凌驾
公开募捐{
//updateStatus（）；//此函数可以更改mInterval的值。
mHandler.postDelayed（mStatusChecker，mInterval）；
}
};
void startRepeatingTask（）{
mStatusChecker.run（）；
}
void stopRepeatingTask（）{
mHandler.removeCallbacks（mStatusChecker）；
}
/**
*下拉滑动刷新时调用此方法
*/
@凌驾
公共void onRefresh（）{
fetchOrders（）；
}
/**
*通过http调用获取电影json
*/
私人订单（）{
//在进行http调用之前显示刷新动画
swipeRefreshLayout.setRefreshing（true）；
//将偏移量追加到url
字符串url=url+偏移量；
//Volley的json数组请求对象
JsonArrayRequest req=新的JsonArrayRequest（url，
新的Response.Listener（）{
@凌驾
公共void onResponse（JSONArray响应）{
Log.d（TAG，response.toString（））；
if（response.length（）>0）{
//通过json循环并添加到订单列表
对于（int i=0；i=偏移）
偏移量=秩；
}捕获（JSONException e）{
Log.e（标记“JSON解析错误：”+e.getMessage（））；
}
}
adapter.notifyDataSetChanged（）；
}
//停止刷卡刷新
swipeRefreshLayout.setRefreshing（false）；
}
}，new Response.ErrorListener（）{
@凌驾
公共无效onErrorResponse（截击错误）{
Log.e（标记“服务器错误：+Error.getMessage（））；
Toast.makeText（getApplicationContext（），error.getMessage（），Toast.LENGTH_LONG.show（）；
//停止刷卡刷新
swipeRefreshLayout.setRefreshing（false）；
}
});
//将请求添加到请求队列
MyApplication.getInstance（）.addToRequestQueue（req）；
}
}
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
private int mInterval = 5000; // 5 seconds by default, can be changed later
private Handler mHandler;
private String TAG = MainActivity.class.getSimpleName();
private String URL = "http://troyka.esy.es/troyka/orders.php";
private SwipeRefreshLayout swipeRefreshLayout;
private ListView listView;
private SwipeListAdapter adapter;
private List<Order> orderList;
// initially offset will be 0, later will be updated while parsing the json
private int offSet = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
//RelativeLayout.LayoutParams layout_description = new RelativeLayout.LayoutParams(50,10);
//Rl.setLayoutParams(layout_description);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
orderList = new ArrayList<>();
adapter = new SwipeListAdapter(this, orderList);
listView.setAdapter(adapter);
swipeRefreshLayout.setOnRefreshListener(this);
/**
* Showing Swipe Refresh animation on activity create
* As animation won't start on onCreate, post runnable is used
*/
swipeRefreshLayout.post(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(true);
fetchOrders();
}
}
);
mHandler = new Handler();
startRepeatingTask();
}
Runnable mStatusChecker = new Runnable() {
@Override
public void run() {
//updateStatus(); //this function can change value of mInterval.
mHandler.postDelayed(mStatusChecker, mInterval);
}
};
void startRepeatingTask() {
mStatusChecker.run();
}
void stopRepeatingTask() {
mHandler.removeCallbacks(mStatusChecker);
}
//added code start here
Runnable mAutoRefreshRunnable = new Runnable() {
@Override
public void run() {
fetchOrders()
mHandler.postDelayed(mAutoRefreshRunnable, 1000);
}
};
@Override
protected void onResume() {
mHandler.postDelayed(mAutoRefreshRunnable, 1000);
}
@Override
protected void onPause() {
mHandler.removeCallbacks(mAutoRefreshRunnable);
}
//added code ends here
/**
* This method is called when swipe refresh is pulled down
*/
@Override
public void onRefresh() {
fetchOrders();
}
/**
* Fetching movies json by making http call
*/
private void fetchOrders() {
// showing refresh animation before making http call
swipeRefreshLayout.setRefreshing(true);
// appending offset to url
String url = URL + offSet;
// Volley's json array request object
JsonArrayRequest req = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
if (response.length() > 0) {
// looping through json and adding to order list
for (int i = 0; i < response.length(); i++) {
try {
JSONObject orderObj = response.getJSONObject(i);
int rank = orderObj.getInt("rank");
String title = orderObj.getString("title");
Order m = new Order(rank, title);
orderList.add(0, m);
// updating offset value to highest value
if (rank >= offSet)
offSet = rank;
} catch (JSONException e) {
Log.e(TAG, "JSON Parsing error: " + e.getMessage());
}
}
adapter.notifyDataSetChanged();
}
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, "Server Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
});
// Adding request to request queue
MyApplication.getInstance().addToRequestQueue(req);
}
}
public类MainActivity扩展AppCompatActivity实现SwipeRefreshLayout.OnRefreshListener{
private int mInterval=5000；//默认为5秒，可以稍后更改
私人经理人；
私有字符串标记=MainActivity.class.getSimpleName（）；
专用字符串URL=”http://troyka.esy.es/troyka/orders.php";
私人SwipeRefreshLayout SwipeRefreshLayout；
私有列表视图列表视图；
专用SwipeListAdapter适配器；
私有列表订单列表；
//初始偏移量为0，稍后在解析json时更新
私有整数偏移=0；
@凌驾
创建时受保护的void（捆绑