我正在使用名为global的类来扩展Application，以便将第一个活动中的值保存到下一个活动中，我使用getter和setter函数来使用此类。每当我想从当前活动中获取或设置任何值时，我都会创建一个全局类的静态对象。应用程序将在第一次启动时正常工作，也可在半小时后正常工作。如果我想在半小时后恢复应用程序，那么全局类中所有变量变为null，并且恢复活动的变量也变为空。
我确信我的代码中存在一些问题。我请求任何人帮我摆脱这个错误。
请在此处查看我的代码 包com.globalnest;
import android.app.Application;
公共类GlobalClass扩展Application { public int displayTab = 0;
public int getDisplayTab() {
return displayTab;
}
public void setDisplayTab(int displayTab) {
this.displayTab = displayTab;
}
public boolean isLeaddetails;
public boolean isLeaddetails() {
return isLeaddetails;
}
public void setLeaddetails(boolean isLeaddetails) {
this.isLeaddetails = isLeaddetails;
}
public static boolean startedApp;
public boolean isStartedApp() {
return startedApp;
}
public void setStartedApp(boolean startedApp1) {
startedApp = startedApp1;
}
public String accessToken;
public String boothId;
public String eventBrite;
public String scanedQR;
public String fname;
public String lname;
public String cname;
public String Id;
public String emailId;
public String ph;
public String note;
public String title;
public String date;
public String cat;
public String booth_fname;
public void setMyBoothFirstName(String booth_fname) {
this.booth_fname = booth_fname;
}
public String getMyBoothFirstName() {
return booth_fname;
}
public void setMyCategory(String cat) {
this.cat = cat;
}
public String getMyCategory() {
return cat;
}
public void setMyDate(String date) {
this.date = date;
}
public String getMyDate() {
return date;
}
public void setMyTitle(String title) {
this.title = title;
}
public String getMyTitle() {
return title;
}
public void setMyNote(String note) {
this.note = note;
}
public String getMyNote() {
return note;
}
public void setMyPh(String ph) {
this.ph = ph;
}
public String getMyPh() {
return ph;
}
public void setMyEmailId(String emailId) {
this.emailId = emailId;
}
public String getMyEmailId() {
return emailId;
}
public void setMyScanedId(String Id) {
this.Id = Id;
}
public String getMyScanedId() {
return Id;
}
public void setMyfname(String fname) {
this.fname = fname;
}
public String getMyfname() {
return fname;
}
public void setMylname(String lname) {
this.lname = lname;
}
public String getMylname() {
return lname;
}
public void setMycname(String cname) {
this.cname = cname;
}
public String getMycname() {
return cname;
}
public void setMyAccessToken(String accessToken) {
this.accessToken = accessToken;
}
public String getMyAccessToken() {
return accessToken;
}
public void setMyBoothId(String boothId) {
this.boothId = boothId;
}
public String getMyBoothId() {
return boothId;
}
public void setMyEventBrite(String eventBrite) {
this.eventBrite = eventBrite;
}
public String getMyEvetBrite() {
return eventBrite;
}
public void setMyScanedQR(String scanedQR) {
this.scanedQR = scanedQR;
}
public String getMyScanedQR() {
return scanedQR;
}
}
公共类AutoSearchText扩展了ListActivity {
static String rFirstName = null, rLastName = null, rCompanyName = null,
string_qrcode;
private static final String TABLE_NAME = "qr";
private ListView listView;
static AutoCompleteTextView et;
String resp;
int a;
private MyArrayAdapter adapter;
static ProgressDialog progressDialog;
private static List<String> data, fname;
private static List<String> newdata, newdata1, qrcode, sorted_qrcode;
private static List<String> data1, sorted_visits, company;
static GlobalClass global;
Cursor cur = null;
String s = null;
String result = null;
String[] array1, array2;
String[] array, arry_qrcode;
static EditText textView;
static String clickQR = null;
TextView total;
Runnable r;
Bundle inBundle;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
inBundle = savedInstanceState;
setContentView(R.layout.list_main);
r = new Runnable() {
@Override
public void run() {
data = new LinkedList<String>();
fname = new LinkedList<String>();
sorted_visits = new LinkedList<String>();
data1 = new LinkedList<String>();
company = new LinkedList<String>();
newdata = new LinkedList<String>();
newdata1 = new LinkedList<String>();
qrcode = new LinkedList<String>();
sorted_qrcode = new LinkedList<String>();
global = (GlobalClass) getApplication();
System.out.println("Start posting");
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog = ProgressDialog.show(getParent(),
"Loading...", "Leads");
}
});
// TODO Auto-generated method stub
get_leads();
total = (TextView) findViewById(R.id.textView1);
final TextView tv = (TextView) findViewById(R.id.txt_lead);
// Cursor cur = null;
// data.add(s);
System.out.println("data" + data);
if (data != null && result != null) {
// tv.setText(data.size()+" Leads");
runOnUiThread(new Runnable() {
@Override
public void run() {
tv.setText(data.size() + " Leads");
}
});
// tv.setText(a+" Leads");
array = new String[data.size()];
array1 = new String[data1.size()];
array2 = new String[company.size()];
arry_qrcode = new String[qrcode.size()];
for (int i = 0; i < data.size(); i++) {
array[i] = data.get(i);
array1[i] = data1.get(i);
array2[i] = company.get(i);
arry_qrcode[i] = qrcode.get(i);
}
String[] a = { "1", "2" };
adapter = new MyArrayAdapter(AutoSearchText.this, array,
array1, array2, arry_qrcode);
runOnUiThread(new Runnable() {
@Override
public void run() {
setListAdapter(adapter);
progressDialog.dismiss();
}
});
}
listView = getListView();
listView.setItemsCanFocus(false);
listView.setTextFilterEnabled(true);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
ViewHolder holder = (ViewHolder) arg1.getTag();
clickQR = holder.getQrcode();
global.setMyScanedQR(clickQR);
if (isOnline()) {
progressDialog = ProgressDialog.show(getParent(),
"Verifying ..", "Please Wait..");
try {
InputMethodManager imethodManager = (InputMethodManager) getApplicationContext()
.getSystemService(
Context.INPUT_METHOD_SERVICE);
imethodManager.hideSoftInputFromWindow(
textView.getWindowToken(), 0);
} catch (Exception e) {
e.printStackTrace();
}
new GetDataTask().execute();
} else {
alert("Warning",
"Please check your Data Connection");
}
// Toast.makeText(AutoSearchText.this,
// holder.getQrcode(),Toast.LENGTH_LONG).show();
}
});
}
};
textView = (EditText) findViewById(R.id.et_search);
textView.addTextChangedListener(new TextWatcher() {
public void onTextChanged(CharSequence s, int start, int before,
int count){
int textlength=0;
if(s!=null){
textlength = s.length();
}
else{
Toast.makeText(getApplicationContext(), "EDit text is null", 600000).show();
return;
}
newdata.clear();
newdata1.clear();
sorted_visits.clear();
sorted_qrcode.clear();
for (int i = 0; i < array.length; i++) {
if (textlength <= array[i].length()) {
if (array[i].subSequence(0, array[i].length())
.toString().toUpperCase()
.indexOf(s.toString().toUpperCase()) != -1) {
newdata.add(array[i]);
newdata1.add(array2[i]);
sorted_visits.add(array1[i]);
sorted_qrcode.add(arry_qrcode[i]);
}
}
}
if (newdata.size() > 0) {
listView.setVisibility(View.VISIBLE);
String[] a = { "1", "2" };
adapter = new MyArrayAdapter(getParent(),
(String[]) newdata.toArray(new String[0]),
(String[]) sorted_visits.toArray(new String[0]),
(String[]) newdata1.toArray(new String[0]),
(String[]) sorted_qrcode.toArray(new String[0]));
setListAdapter(adapter);
listView = getListView();
} else {
listView.setVisibility(View.INVISIBLE);
}
listView.setItemsCanFocus(false);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
public void afterTextChanged(Editable s) {
/*
* if (newdata != null&&result!=null) { array = new
* String[newdata.size()]; array1= new String[newdata.size()];
* for (int i = 0; i < newdata.size(); i++) { array[i] =
* newdata.get(i); array1[i]=newdata.get(i); } String[]
* a={"1","2"}; adapter = new MyArrayAdapter(getParent(),
* array,array1); setListAdapter(adapter); } listView =
* getListView(); listView.setItemsCanFocus(false);
* listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);}
*/}
});
}
/*******************************************************************
*
* @Desc : This method to diplsy alert when connection not available and
* control navigate to scan
* @param : String
* @return : none
*
* ********************************************************
*/
private void alert(String title, String error) {
if (progressDialog.isShowing())
progressDialog.dismiss();
AlertDialog alertDialog = new AlertDialog.Builder(getParent()).create();
alertDialog.setCancelable(false);
alertDialog.setTitle(title);
alertDialog.setMessage(error);
alertDialog.setCancelable(false);
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
try {
global.setDisplayTab(0);
Intent i = new Intent(getParent(), AdminTabHost.class);
startActivity(i);
} catch (Exception e) {
e.printStackTrace();
}
}
});
alertDialog.show();
}
private void get_leads() {
// TODO Auto-generated method stub
try {
String url = "https://ap1.salesforce.com/services/apexrest/getLead?Id="
+ global.getMyBoothId();
// URLEncoder.encode(textView.getText().toString(),"UTF-8"));
HttpGet httpGet = new HttpGet(url);
System.out.println("url" + url);
// https://na7.salesforce.com/services/apexrest/GlobalNestEM/Verify_Lead?Id"+global.getMyBoothId()+"&Barcode=100000051
HttpParams httpParameters = new BasicHttpParams();
// set up time out connection 30s
int timeoutConnection = 3000;
HttpConnectionParams.setConnectionTimeout(httpParameters,
timeoutConnection);
int timeoutSocket = 3000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
String token = "00DA0000000L49t!AQ8AQFxfw19eJBNw_NNxyesR.PTOiFMpZP4SrXkEpSZ3tl_Hr4btzhggN_KVwT5x3cS1o0ohcVSeIBYC1aLkhWMitSA05JUt";
httpGet.addHeader("Authorization",
"OAuth " + global.getMyAccessToken());
// System.out.println("post acessToken"+global.getMyAccessToken());
DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpResponse httpResponse;
httpResponse = httpClient.execute(httpGet);
result = EntityUtils.toString(httpResponse.getEntity());
System.out.println("res for getLead" + result);
JSONArray ja;
String s = null;
// progressDialog.dismiss();
try {
ja = new JSONArray(result);
// JSONObject j=new JSONObject(ja);
ja.length();
a = ja.length();
System.out.println("xxxx" + ja.length());
for (int i = 0; i < ja.length(); i++) {
String visits = null;
String date_global = null, temp = null;
try {
visits = ja
.getJSONObject(i)
.get("Attendee_NextFollowUpDate__c")
.toString();
DateFormat df1 = new SimpleDateFormat("yyyy-MM-dd");
DateFormat df2 = new SimpleDateFormat("MM-dd-yyyy");
temp = df2.format(df1.parse(visits));
date_global = temp.replace('-', '/').toString();
// s=visits.replace('-','/').toString();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
rLastName = ja.getJSONObject(i)
.get("Attendee_LastName__c")
.toString();
rCompanyName = ja.getJSONObject(i)
.get("Attendee_Company__c")
.toString();
rFirstName = ja.getJSONObject(i)
.get("Attendee_FirstName__c")
.toString();
System.out.println("rFirstName" + rFirstName + ja.length());
try {
string_qrcode = ja.getJSONObject(i)
.get("Attendee_BarCode1__c")
.toString();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
fname.add(rFirstName);
data.add(rFirstName + " " + rLastName);
// data.add(rFirstName + "\n" + rLastName);
// newdata.add(rFirstName+"\n"+rLastName);
data1.add(date_global);
company.add(rCompanyName);
qrcode.add(string_qrcode);
}
// System.out.println(""+ja.getJSONObject(0).get("Attendee_LastName__c"));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("Result lead details" + result);
} catch (ClientProtocolException e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
alert("Warning", "Please check your Data Connection");
}
});
e.printStackTrace();
} catch (IOException e) {
runOnUiThread(new Runnable() {
@Override
public void run() {
alert("Warning", "Please check your Data Connection");
}
});
e.printStackTrace();
} catch (Exception e) {
alert("Warning", "Please check your Data Connection");
}
}
private Boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if (ni != null && ni.isConnected())
return true;
return false;
}
private void alertDialog(String string) {
// TODO Auto-generated method stub
AlertDialog.Builder d1 = new AlertDialog.Builder(getParent());
d1.setMessage(string);
d1.setTitle("Search Result");
d1.setPositiveButton("ok", null);
d1.setCancelable(true);
d1.create().show();
}
public static String postPost(String s) throws NoNetWorkException {
System.out.println("Start posting");
global.setMyfname(null);
global.setMyEmailId(null);
global.setMyNote(null);
global.setMylname(null);
global.setMyDate(null);
global.setMycname(null);
global.setMyPh(null);
global.setMyTitle(null);
String result = null;
try {
String url = "https://ap1.salesforce.com/services/apexrest/Verify_Lead?Id="
+ global.getMyBoothId()
+ "&Barcode="
+ clickQR
+ "&EventBrite=" + global.getMyEvetBrite() + "";
HttpGet httpGet = new HttpGet(url);
System.out.println("url" + url);
// https://na7.salesforce.com/services/apexrest/GlobalNestEM/Verify_Lead?Id"+global.getMyBoothId()+"&Barcode=100000051
HttpParams httpParameters = new BasicHttpParams();
// set up time out connection 30s
/* int timeoutConnection = 30000;
HttpConnectionParams.setConnectionTimeout(httpParameters,
timeoutConnection);
int timeoutSocket = 30000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);*/
httpGet.addHeader("Authorization",
"OAuth " + global.getMyAccessToken());
// System.out.println("post acessToken"+global.getMyAccessToken());
DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpResponse httpResponse;
httpResponse = httpClient.execute(httpGet);
result = EntityUtils.toString(httpResponse.getEntity());
System.out.println("Verify result" + result);
// return result;
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new NoNetWorkException();
} catch (IOException e) {
e.printStackTrace();
throw new NoNetWorkException();
}
return result;
}
private class GetDataTask extends AsyncTask<Void, Void, String> {
@Override
protected String doInBackground(Void... params) {
if (isOnline()) {
try {
Thread.sleep(0);
resp = postPost("");
System.out.println(" post responceforVerify= " + resp);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (NoNetWorkException e) {
Log.d("No NetWork", "No NetWork");
resp = "no network";
return resp;
}
}
return resp;
}
@Override
protected void onPostExecute(String result) {
progressDialog.dismiss();
super.onPostExecute(result);
if (resp.equalsIgnoreCase("no network")) {
runOnUiThread(new Runnable() {
@Override
public void run() {
alert("Warning", "Please check your Data Connection");
}
});
} else if (result != null) {
if (!result.contains("Error__c")) {
try {
// response manipulation
String currentDateTimeString = getdate();
JSONObject ja = new JSONObject(result);
global.setMyfname(ja.get(
"Attendee_FirstName__c")
.toString());
try {
try {
global.setMyCategory(ja
.get("Attendee_LeadCategory__c")
.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
global.setMyEmailId(ja.get(
"Attendee_EmailId__c")
.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
global.setMyNote(ja
.get("Attendee_GatheredComments__c")
.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
global.setMyTitle(ja
.get("Attendee_Designation__c")
.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
String v, d_g, t;
v = ja.get(
"Attendee_NextFollowUpDate__c")
.toString();
DateFormat df1 = new SimpleDateFormat(
"yyyy-MM-dd");
DateFormat df2 = new SimpleDateFormat(
"MM-dd-yyyy");
t = df2.format(df1.parse(v));
d_g = t.replace('-', '/').toString();
global.setMyDate(d_g);
// global.setMyDate(ja.get("Attendee_NextFollowUpDate__c").toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
global.setMyPh(ja
.get("Attendee_PhoneNumber__c")
.toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ja.get("Attendee_Company__c");
// global.setMyScanedId(ja.get("Id").toString());
global.setMycname(ja.get(
"Attendee_Company__c")
.toString());
global.setMylname(ja.get(
"Attendee_LastName__c")
.toString());
System.out.println("verify values" + resp);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
global.setDisplayTab(1);
global.setLeaddetails(true);
Intent edit = new Intent(getParent(), LeadDetails.class);
TabGroupActivity parentActivity = (TabGroupActivity) getParent();
parentActivity.startChildActivity("Verify", edit);
} catch (Exception e) {
e.printStackTrace();
alertDialog("Invalid QR Code");
}
} else {
try {
JSONObject ja = new JSONObject(result);
alertDialog(ja.get("Error__c").toString());
// startChildActivity("EditActivity", new
// Intent(this,LeadDetails.class));
/*
* Intent edit = new Intent(getParent(),
* LeadDetails.class); TabGroupActivity parentActivity =
* (TabGroupActivity)getParent();
* parentActivity.startChildActivity("LeadDetails",
* edit);
*/
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} else {
runOnUiThread(ne
答案 0 :(得分：0)
我认为问题不一定在您的代码中，当Android没有足够的内存用于前台应用程序并且它从后台应用程序的内存对象中释放时，就会发生这种情况。我认为这是在你的案件也.. 我认为唯一要做的就是检查你使用的对象是否为空，并使用一些默认值再次启动它们。 请参阅此处：Activity life cycle了解更多信息..
答案 1 :(得分：0)
问题肯定存在于您的生命周期管理中。只要JVM（在本例中为Davlik）运行，静态变量的值就会存在。但OS可以在它喜欢这个想法时杀掉它 - 所以很可能你的变量在完全重启后是null。
从您的源代码看，您是子类化应用程序类。如果是这种情况，您还应在清单中使用它。
我也在你的runnable中看到问题 - 你在run（）方法中执行findViewById（） - 这不是最理想的（你应该在活动的onCreateMethod（）中这样做）
您的全局存储类将无法在应用程序重新启动后继续存在 - 所有值都将丢失。
如果你想保持状态持久性，你应该将值存储在其他地方（共享偏好是这个的好选择）。为了让您的生活更轻松，您可以抓住我写的小型图书馆：
我将使您的生活更轻松地将对象字段编组和解组为首选项对象。
答案 2 :(得分：0)
好的，你走了，
您可以使用Application
getApplicationContext()课程中设置值
((GlobalClass)getApplicationContext()).setLastName("Poptani");