我正在检查一个值：borrow[0] ，在此基础上我需要刷新TextView称为message 。 所有这些都发生在一个method()内，该在我的片段onCreateView()中从事件中调用button.setOnClickListener。
if (borrow[0]) {
Log.i("inside borrow", borrow[0] +"");
message.setText("You have successfully borrowed the book. Due date is" + dueDate[0].substring(0, Math.min(dueDate[0].length(), 10)));
}
if (!borrow[0]){
Log.i("inside borrow", borrow[0] +"");
message.setText("This book is already borrowed by you.");
}
此按钮可以多次单击。
我从其他论坛了解到我需要以不同的生命周期方法刷新它。谁能建议我可以使用哪种方法？因为我的borrow[0]只能在我的method()中访问，所以需要找到一种方法 - 存储在哪里，以便可以从"该生命周期方法"访问它。欣赏示例代码，因为我不太熟悉生命周期方法。提前非常感谢。
让我粘贴我的整个方法代码：
public void borrowItem(String patronId, final String itemId) {
final int DEFAULT_TIMEOUT = 200000 * 1000000000;
String str;
// final boolean[] borrow = new boolean[1];
// final String[] dueDate = new String[1];
AsyncHttpClient client = new AsyncHttpClient();
client.setTimeout(DEFAULT_TIMEOUT);
progress.setMessage("Please Wait...");
progress.setIndeterminate(false);
progress.setCancelable(false);
progress.show();
// final String[] names = new String[4];
final CountDownLatch latch = new CountDownLatch(1);
Thread t = new Thread() {
public void run() {
Looper.prepare(); //For Preparing Message Pool for the child Thread
HttpClient client = new DefaultHttpClient();
HttpConnectionParams.setConnectionTimeout(client.getParams(), 100000000); //Timeout Limit
HttpResponse response;
try {
HttpPost post = new HttpPost("http://...........");
JSONObject json = new JSONObject();
try {
json.put("itemID", itemId);
json.put("userID", sharedpreferences.getString("PatronID", null));
json.put("sessionID", sharedpreferences.getString("PatronIdKey", null));
Log.i("CVPL --> sessionid", sharedpreferences.getString("PatronIdKey", null));
} catch (JSONException e) {
e.printStackTrace();
}
StringEntity se = new StringEntity(json.toString());
Log.i("CVPL --> json", json.toString());
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post.setEntity(se);
response = client.execute(post);
// Toast.makeText(getActivity().getApplicationContext(), "XML File:" + response , Toast.LENGTH_LONG).show();
/*Checking response */
if (response != null) {
HttpEntity entity = response.getEntity();
String result = EntityUtils.toString(entity);
// Log.i("CVPL - AccFrag", result);
progress.dismiss();
final CountDownLatch latch = new CountDownLatch(1);
final String[] names = new String[4];
JSONArray mArray, mArray1, mArray2;
// int totalCount=0;
// int avail=0;
String value, title, publisher;
try {
JSONObject obj = new JSONObject(result);
//Results
if (obj.getJSONObject("Results") != null) {
JSONObject obj1 = obj.getJSONObject("Results");
//LookupTitleInfoResponse
if (obj1.getJSONObject("CheckoutResponse") != null) {
JSONObject obj2 = obj1.getJSONObject("CheckoutResponse");
// Log.i("obj2.getString(dueDate)", obj2.getString("dueDate"));
//TitleInfo
if (!obj2.getString("dueDate").equals("null")) {
JSONObject obj3 = obj2.getJSONObject("dueDate");
value = obj3.getString("value");
// if(value != null)
Log.i("due date:", value.substring(0, Math.min(value.length(), 10)));
// Toast.makeText(getActivity().getApplicationContext(), "Due Date:" + value , Toast.LENGTH_LONG).show();
// AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
// builder.setMessage("You have successfully borrowed the book. Due date is" + value).create().show();
borrow[0] = true;
dueDate[0] = value;
Log.i("borrow", borrow[0] + "");
} else {
// AlertDialog.Builder builder = new AlertDialog.Builder(getActivity().getApplicationContext());
// builder.setMessage("This book is already borrowed by you.").create().show();
borrow[0] = false;
Log.i("borrow", borrow[0] + "");
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
// replaceFragment(result);
}
} catch (Exception e) {
e.printStackTrace();
}
}
};
t.start();
Log.i("borrow after thread", borrow[0] + "");
if (borrow[0]) {
Log.i("inside borrow", borrow[0] +"");
message.setText("You have successfully borrowed the book. Due date is" + dueDate[0].substring(0, Math.min(dueDate[0].length(), 10)));
}
if (!borrow[0]){
Log.i("inside borrow", borrow[0] +"");
message.setText("This book is already borrowed by you.");
}
}
我的按钮事件：
borrowBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (v.getId() == R.id.checkout_button) {
if (first_time_check()== true) {
// getAccInfo(sharedpreferences.getString("PatronIdKey", null), getArguments().getString("barcode"));
borrowItem(sharedpreferences.getString("PatronIdKey", null), getArguments().getString("barcode"));
Log.i("after borrow", borrow[0] + "");
if (borrow[0]) {
Log.i("inside borrow", borrow[0] +"");
message.setText("You have successfully borrowed the book. Due date is: " + dueDate[0].substring(0, Math.min(dueDate[0].length(), 10)));
}
if (!borrow[0]){
Log.i("inside borrow", borrow[0] +"");
message.setText("This book is already borrowed by you.");
}
}
}
}
});
我的变量声明：
public class Checkout extends Fragment {
final boolean[] borrow = new boolean[1];
final String[] dueDate = new String[1];
启动线程后不确定，为什么不调用剩余代码？我主要看到 - "这本书已经被你借了。不确定是否由于线程？
在某个时间段内回想一下您的方法，没有任何神奇的生命周期事件可以异步刷新您的TextViews
CountDownTimer t = new CountDownTimer(MAX_VALUE , 10000) {
// This is called every 10 seconds interval.
public void onTick(long millisUntilFinished) {
refreshViews();
}
public void onFinish() {
start();
}
}.start();
public void refreshViews(){
if (first_time_check()== true) {
borrowItem(sharedpreferences.getString("PatronIdKey", null), getArguments().getString("barcode"));
Log.i("after borrow", borrow[0] + "");
if (borrow[0]) {
Log.i("inside borrow", borrow[0] +"");
message.setText("You have successfully borrowed the book. Due date is: " + dueDate[0].substring(0, Math.min(dueDate[0].length(), 10)));
}
if (!borrow[0]){
Log.i("inside borrow", borrow[0] +"");
message.setText("This book is already borrowed by you.");
}
}
将TextView声明为 Fragment 类中的公共变量。然后在生命周期方法中获取onCreateView TextView的视图引用。现在，可以从您那里的method()功能轻松访问TextView。下面是一个可能对你有所帮助的示例代码。
public class MyFragment extends Fragment {
private TextView message;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.your_fragment_layout, container, false);
message = (TextView) v.findViewById(R.id.message);
// Here's your button.setOnClickListener
}
private void method() {
if (borrow[0]) {
Log.i("inside borrow", borrow[0] +"");
message.setText("You have successfully borrowed the book. Due date is" + dueDate[0].substring(0, Math.min(dueDate[0].length(), 10)));
} else {
Log.i("inside borrow", borrow[0] +"");
message.setText("This book is already borrowed by you.");
}
}
}
在此处检查您的线程是否返回 null。
obj1.getJSONObject("CheckoutResponse")