如何每10秒刷新一次Android listview
我对安卓非常陌生。我正在做这件事,但是我在刷新时遇到了问题,无法理解如何刷新我的listview如何每10秒刷新一次Android listview,android,listview,refresh,Android,Listview,Refresh,我对安卓非常陌生。我正在做这件事,但是我在刷新时遇到了问题,无法理解如何刷新我的listview // Creating volley request obj JsonArrayRequest movieReq = new JsonArrayRequest(url, new Response.Listener<JSONArray>() { @Override public
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
// adding movie to movies array
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
/** REFRESH HERE /**
Thread t = new Thread() {
@Override
public void run() {
try {
while (!isInterrupted()) {
Thread.sleep(10000);
runOnUiThread(new Runnable() {
@Override
public void run() {
Log.e(TAG, "EVRY 10 SECOND START NOW ");
listView.invalidateViews();
listView.refreshDrawableState();
adapter.notifyDataSetChanged();
// Log.e(TAG, String.valueOf(movieList));
// fire the event
}
});
}
} catch (InterruptedException e) {
}
}
};
t.start();
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
使用处理程序及其postDelayed方法使列表的适配器无效,如下所示:
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
adapter.notifyDataSetChanged();
handler.postDelayed(this, 10 * 1000);
}
}, 10 * 1000);
只能在主(UI)线程中更新UI
通过在主线程中创建处理程序,您可以确保发布到处理程序的所有内容也在主线程中运行。将您的截取请求代码放入一个方法中,让我们命名为id
fetchData()代码>
然后,您可以在10秒后通过以下代码再次呼叫您的服务:
final Handler mHandler = new Handler();
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(10000);
mHandler.post(new Runnable() {
@Override
public void run() {
// Write your code here to call the method.
fetchData();
}
});
} catch (Exception e) {
// TODO: handle exception here
e.printStackTrace();
}
}
}
}).start();
试试这个,如果有问题请告诉我。使用计时器:
Timer timerAsync;
TimerTask timerTaskAsync;
timerAsync = new Timer();
timerTaskAsync = new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
doWork();
}
});
}
};
timerAsync.schedule(timerTaskAsync, 1000, 5000);// First Start 1 seconds 5 seconds repeat
是否要再次请求正在使用的web服务?是,发出新请求并使用新项目获取新json您可以在10秒后使用计时器调用web服务,然后使用onResponse()刷新listviewadapter.getData().clear();在刷新之前,我清理了数据和它的作品,然后我得到了循环,谢谢你,乐于帮助,乐于编码!!
Timer timerAsync;
TimerTask timerTaskAsync;
timerAsync = new Timer();
timerTaskAsync = new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
doWork();
}
});
}
};
timerAsync.schedule(timerTaskAsync, 1000, 5000);// First Start 1 seconds 5 seconds repeat