我正在开发一个使用片段的应用程序。在线程应用程序崩溃时调用 Web 服务。当方向改变时，日志以红色显示以下异常：
12-14 14:36:51.770: E/WindowManager(5270): Activity com.weg.ecatalogfragment.ECatalogFragmentActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41457e20 that was originally added here
12-14 14:36:51.770: E/WindowManager(5270): android.view.WindowLeaked: Activity com.weg.ecatalogfragment.ECatalogFragmentActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41457e20 that was originally added here
12-14 14:36:51.770: E/WindowManager(5270): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:345)
12-14 14:36:51.770: E/WindowManager(5270): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:268)
12-14 14:36:51.770: E/WindowManager(5270): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:216)
12-14 14:36:51.770: E/WindowManager(5270): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:141)
12-14 14:36:51.770: E/WindowManager(5270): at android.view.Window$LocalWindowManager.addView(Window.java:537)
12-14 14:36:51.770: E/WindowManager(5270): at android.app.Dialog.show(Dialog.java:278)
12-14 14:36:51.770: E/WindowManager(5270): at android.app.ProgressDialog.show(ProgressDialog.java:117)
12-14 14:36:51.770: E/WindowManager(5270): at android.app.ProgressDialog.show(ProgressDialog.java:100)
12-14 14:36:51.770: E/WindowManager(5270): at android.app.ProgressDialog.show(ProgressDialog.java:95)
12-14 14:36:51.770: E/WindowManager(5270): at com.weg.ecatalogfragment.HomeScreen.syncWithServer(HomeScreen.java:416)
12-14 14:36:51.770: E/WindowManager(5270): at com.weg.ecatalogfragment.HomeScreen.onClick(HomeScreen.java:622)
12-14 14:36:51.770: E/WindowManager(5270): at android.view.View.performClick(View.java:3528)
12-14 14:36:51.770: E/WindowManager(5270): at android.view.View$PerformClick.run(View.java:14235)
12-14 14:36:51.770: E/WindowManager(5270): at android.os.Handler.handleCallback(Handler.java:605)
12-14 14:36:51.770: E/WindowManager(5270): at android.os.Handler.dispatchMessage(Handler.java:92)
12-14 14:36:51.770: E/WindowManager(5270): at android.os.Looper.loop(Looper.java:137)
12-14 14:36:51.770: E/WindowManager(5270): at android.app.ActivityThread.main(ActivityThread.java:4424)
12-14 14:36:51.770: E/WindowManager(5270): at java.lang.reflect.Method.invokeNative(Native Method)
12-14 14:36:51.770: E/WindowManager(5270): at java.lang.reflect.Method.invoke(Method.java:511)
12-14 14:36:51.770: E/WindowManager(5270): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
12-14 14:36:51.770: E/WindowManager(5270): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
12-14 14:36:51.770: E/WindowManager(5270): at dalvik.system.NativeStart.main(Native Method)
再次调用此 Activity 后，由于代码流的原因，上下文无法出现在警报框和应用程序崩溃。
12-14 14:37:16.950: E/AndroidRuntime(5270): FATAL EXCEPTION: main
12-14 14:37:16.950: E/AndroidRuntime(5270): java.lang.NullPointerException
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.AlertDialog.<init>(AlertDialog.java:98)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.ProgressDialog.<init>(ProgressDialog.java:78)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.ProgressDialog.show(ProgressDialog.java:111)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.ProgressDialog.show(ProgressDialog.java:100)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.ProgressDialog.show(ProgressDialog.java:95)
12-14 14:37:16.950: E/AndroidRuntime(5270): at com.weg.ecatalogfragment.HomeScreen$1.dispatchMessage(HomeScreen.java:141)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.os.Looper.loop(Looper.java:137)
12-14 14:37:16.950: E/AndroidRuntime(5270): at android.app.ActivityThread.main(ActivityThread.java:4424)
12-14 14:37:16.950: E/AndroidRuntime(5270): at java.lang.reflect.Method.invokeNative(Native Method)
12-14 14:37:16.950: E/AndroidRuntime(5270): at java.lang.reflect.Method.invoke(Method.java:511)
12-14 14:37:16.950: E/AndroidRuntime(5270): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:817)
12-14 14:37:16.950: E/AndroidRuntime(5270): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
12-14 14:37:16.950: E/AndroidRuntime(5270): at dalvik.system.NativeStart.main(Native Method)
要么它不应该再次调用 Activity，要么此时流应该停止。
如果使用此片段，请建议我，我应该如何处理我的网络服务。下面是我的代码：
public class HomeScreen extends Fragment implements OnClickListener,OnItemSelectedListener,IServerResponse
{
private Handler _handler = new Handler() {
public void dispatchMessage(Message msg) {
switch (msg.arg2) {
case Constant.PID_GETUPDATEDATA:
final ProgressDialog progressDialog = ProgressDialog.show(HomeScreen.this.getActivity(),"", Constant.MSG_SYNC);
final String msgData = (String) msg.obj;
new Thread(new Runnable() {
public void run() {
Looper.prepare();
try{
if (msgData.equalsIgnoreCase("We apologize, no data was found.")) {
HomeScreen.this.getActivity().runOnUiThread(new Runnable() {
public void run() {
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR,
Constant.MSG_NOUPDATE, HomeScreen.this.getActivity(), false);
}
});
}else{
JSONObject jsonObject=new JSONObject(msgData);
JSONObject electricObject = jsonObject.getJSONObject("NewDataSet");
JSONArray electricDBArray=electricObject.getJSONArray("Electrical_DB");
int count=electricDBArray.length();
String PrivousDateTime=myPref.getString("PREVIOUS_DATETIME", "");
if(PrivousDateTime.equals("")||PrivousDateTime==null)
{
_eCatalogueTable.deleteTable(ECatalogueDatabase.DATABASE_TABLE);
}
for(int j=0;j<count;j++)
{
String productLineID=electricDBArray.getJSONObject(j).getString("id");
String productLine=electricDBArray.getJSONObject(j).getString("productline");
String hp = electricDBArray.getJSONObject(j).getString("outputhp");
String rpm = electricDBArray.getJSONObject(j).getString("rpm");
String voltage = electricDBArray.getJSONObject(j).getString("voltage");
String frame = electricDBArray.getJSONObject(j).getString("frame");
if(!isProductIDPresentInDb(productLineID))
{
_eCatalogueTable.InsertECatalogue(productLineID,productLine,hp, rpm, voltage, frame);
}else
{
_eCatalogueTable.updateECatalogue(productLineID,productLine, hp, rpm, voltage, frame);
}
}
HomeScreen.this.getActivity().runOnUiThread(new Runnable() {
public void run() {
Constant.showAlertDialog(Constant.DIALOG_TITLE_SUCCESS,Constant.MSG_SUCCESS, HomeScreen.this.getActivity(), false);
findGMTDateTime();
_mEditPref=myPref.edit();
_mEditPref.putString("PREVIOUS_DATETIME", dateTimeValue);
_mEditPref.commit();
}
});
}
}catch(Exception e)
{
e.printStackTrace();
HomeScreen.this.getActivity().runOnUiThread(new Runnable() {
public void run() {
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR,
Constant.MSG_SERVER_FAIL, HomeScreen.this.getActivity(), false);
}
});
}
progressDialog.cancel();
}
}).start();
break;
case Constant.PID_ALERTDIGLOG:
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR,Constant.MSG_SERVER_FAIL, HomeScreen.this.getActivity(),false);
break;
}
};
};
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mContentView = inflater.inflate(R.layout.home_screen , container, false);
_eCatalogueTable=new ECatalogueDatabase(HomeScreen.this.getActivity());
_eCatalogueTable.open();
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
_headetRelativelayout=(RelativeLayout)mContentView.findViewById(R.id.header_layout);
_headetRelativelayout.setVisibility(View.GONE);
}
if(savedInstanceState!=null)
{
saveState="SavedInstance";
rotateSaveInstace=true;
Constant.checkPdf=false;
//Toast.makeText(this.getActivity(),"savedInstaceState", Toast.LENGTH_LONG).show();
}else
{
saveStateBoolea=true;
saveState="NoSavedInstance";
// Toast.makeText(this.getActivity(),"No savedInstaceState", Toast.LENGTH_LONG).show();
}
_productText=(TextView)mContentView.findViewById(R.id.productline_txt);
_hpText=(TextView)mContentView.findViewById(R.id.hp_txt);
_rpmText=(TextView)mContentView.findViewById(R.id.rpm_txt);
_voltageText=(TextView)mContentView.findViewById(R.id.voltage_txt);
_frameSizeText=(TextView)mContentView.findViewById(R.id.frame_txt);
_searchBypartEditText=(EditText)mContentView.findViewById(R.id.searchpart_edittxt);
_searchButton=(Button)mContentView.findViewById(R.id.serach_btn);
_searchButton.setEnabled(false);
_searchButton.setOnClickListener(this);
_syncButton=(Button)mContentView.findViewById(R.id.sync_btn);
_syncButton.setOnClickListener(this);
_productSpinner=(Spinner)mContentView.findViewById(R.id.productline_spinner);
_productSpinner.setOnItemSelectedListener(this);
_hpSpinner=(Spinner)mContentView.findViewById(R.id.hp_spinner);
_hpSpinner.setOnItemSelectedListener(this);
_rpmSpinner=(Spinner)mContentView.findViewById(R.id.rpm_spinner);
_rpmSpinner.setOnItemSelectedListener(this);
_voltageSpinner=(Spinner)mContentView.findViewById(R.id.voltage_spinner);
_voltageSpinner.setOnItemSelectedListener(this);
_frameSpinner=(Spinner)mContentView.findViewById(R.id.frame_spinner);
_frameSpinner.setOnItemSelectedListener(this);
_productRealtiveLayout=(RelativeLayout)mContentView.findViewById(R.id.product_layout);
_productRealtiveLayout.setOnClickListener(this);
_hpRelativeLayout=(RelativeLayout)mContentView.findViewById(R.id.hp_layout);
_hpRelativeLayout.setOnClickListener(this);
_rpmRelativeLayout=(RelativeLayout)mContentView.findViewById(R.id.rpm_layout);
_rpmRelativeLayout.setOnClickListener(this);
_voltageRelativeLayout=(RelativeLayout)mContentView.findViewById(R.id.voltage_layout);
_voltageRelativeLayout.setOnClickListener(this);
_framSizeRelativeLayout=(RelativeLayout)mContentView.findViewById(R.id.frame_layout);
_framSizeRelativeLayout.setOnClickListener(this);
useTextwatcher();
_mHPArrayList.add(0, getString(R.string.hp_txt));
_mRPMArrayList.add(0, getString(R.string.rpm_txt));
_mVoltageArrayList.add(0,getString(R.string.voltage_txt));
_mFrameSizeLineArrayList.add(0,getString(R.string.frame_txt));
_productSpinner.setSelection(0);
_hpSpinner.setSelection(0);
_rpmSpinner.setSelection(0);
_voltageSpinner.setSelection(0);
_frameSpinner.setSelection(0);
fetchProductLineFromDatabase();
_productLineArrayAdapter = new ArrayAdapter(this.getActivity(),android.R.layout.simple_spinner_dropdown_item,_mProductLineArrayList);
_hpArrayAdapter=new ArrayAdapter(this.getActivity(),android.R.layout.simple_spinner_dropdown_item,_mHPArrayList);
_rpmArrayAdapter = new ArrayAdapter(this.getActivity(),android.R.layout.simple_spinner_dropdown_item,_mRPMArrayList);
_voltageArrayAdapter = new ArrayAdapter(this.getActivity(),android.R.layout.simple_spinner_dropdown_item,_mVoltageArrayList);
_frameSizeArrayAdapter=new ArrayAdapter(this.getActivity(),android.R.layout.simple_spinner_dropdown_item,_mFrameSizeLineArrayList);
_productSpinner.setAdapter(_productLineArrayAdapter);
_hpSpinner.setAdapter(_hpArrayAdapter);
_rpmSpinner.setAdapter(_rpmArrayAdapter);
_voltageSpinner.setAdapter(_voltageArrayAdapter);
_frameSpinner.setAdapter(_frameSizeArrayAdapter);
// GMT Date Time
date=new Date();
simpleDateFormat=new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
myPref=getActivity().getPreferences(Context.MODE_PRIVATE);
String PrivousDateTime=myPref.getString("PREVIOUS_DATETIME", "");
boolean firstCheckAlert=myPref.getBoolean("FIRST_ALRT", firstTimeShowAllert);
if(!firstCheckAlert)
{
showMessageAlert();
}
if(PrivousDateTime.equals("")||PrivousDateTime==null)
{
dateTimeValue= "01/01/2012 00:00:00";
}else
{
dateTimeValue=PrivousDateTime;
}
return mContentView;
}
private void syncWithServer() {
if (NetworkAvailablity.checkNetworkStatus(HomeScreen.this.getActivity()))
{
final ProgressDialog progressDialog = ProgressDialog.show(HomeScreen.this.getActivity(),"",Constant.MSG_SYNC);
new Thread(new Runnable() {
public void run() {
String response = "";
SoapObject request = new SoapObject(WebServiceDetails.SERVICENAMESPACE,WebServiceDetails.METHOD_CHECKLATESTDATADATE);
request.addProperty("lastmodifieddate",dateTimeValue);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = true;
envelope.setOutputSoapObject(request);
AndroidHttpTransport httpTransport = new AndroidHttpTransport(WebServiceDetails.URL);
httpTransport.debug = true;
try {
httpTransport.call(WebServiceDetails.SOAP_CHECKLATESTDATADATE, envelope); // send
Object data = envelope.getResponse();
if (data instanceof SoapObject) {
SoapObject data2 = (SoapObject) data;
response = data2.toString();
} else if (data instanceof SoapPrimitive) {
SoapPrimitive data3 = (SoapPrimitive) data;
response = data3.toString();
} else if (data != null) {
response = data.toString();
} else if (data == null) {
response = "nodata";
}
serverResponse(response,Constant.PID_GETUPDATEDATA);
}catch (Exception e) {
e.printStackTrace();
serverResponse(null,Constant.PID_ALERTDIGLOG);
}
progressDialog.dismiss();
}
}).start();
}
else {
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR,Constant.MSG_INTERNETERROR, HomeScreen.this.getActivity(),false);
}
}
public void onClick(View v) {
fetchTextvalue();
switch (v.getId()) {
case R.id.serach_btn:
if (NetworkAvailablity.checkNetworkStatus(HomeScreen.this.getActivity())){
FragmentManager fm = this.getActivity().getSupportFragmentManager();
int count=fm.getBackStackEntryCount();
System.out.println("gdfgdgcvbccccccccccccccccccc "+count);
for(int i = 0; i < count; ++i) {
fm.popBackStack();
}
fetchTextvalue();
if(!(_fetchProductText.equalsIgnoreCase(getString(R.string.product_txt))||_fetchHpText.equalsIgnoreCase( getString(R.string.hp_txt))
||_fetchRPMText.equalsIgnoreCase( getString(R.string.rpm_txt))||_fetchVoltageText.equalsIgnoreCase(getString(R.string.voltage_txt))
||_fetchFrameSizeText.equalsIgnoreCase(getString(R.string.frame_txt))))
{
if(_mGetEditValue.equalsIgnoreCase(getString(R.string.enterpart_txt))||_mGetEditValue==null)
{
dataSheetCall();
}else
{
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR, Constant.MSG_ENABLESEARCH, HomeScreen.this.getActivity(), false);
_searchBypartEditText.setText("");
_searchButton.setEnabled(true);
_mGetEditValue=(getString(R.string.enterpart_txt));
}
}else if((!_mGetEditValue.equalsIgnoreCase(getString(R.string.enterpart_txt)))||_mGetEditValue!=null)
{
if((_fetchProductText.equalsIgnoreCase(getString(R.string.product_txt))&&_fetchHpText.equalsIgnoreCase( getString(R.string.hp_txt))
&&_fetchRPMText.equalsIgnoreCase( getString(R.string.rpm_txt))&&_fetchVoltageText.equalsIgnoreCase(getString(R.string.voltage_txt))
&&_fetchFrameSizeText.equalsIgnoreCase(getString(R.string.frame_txt))))
{
dataSheetCall();
}
else
{
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR, Constant.MSG_ENABLESEARCH, HomeScreen.this.getActivity(), false);
_searchBypartEditText.setText("");
_searchButton.setEnabled(true);
resetValue();
}
}
}else{
Constant.showAlertDialog(Constant.DIALOG_TITLE_ERROR,Constant.MSG_INTERNETERROR, HomeScreen.this.getActivity(),false);
_productSpinner.setSelection(0);
}
break;
case R.id.sync_btn:
syncWithServer();
break;
default:
break;
}
}
private void dataSheetCall()
{
if (getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
Intent datasheetIntent=new Intent(this.getActivity(),DataSheetScreenActivity.class);
datasheetIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
datasheetIntent.putExtra("PRODUCTLINE", _productString);
datasheetIntent.putExtra("HP", _hpString);
datasheetIntent.putExtra("RPM",_rpmString);
datasheetIntent.putExtra("VOLTAGE", _voltageString);
datasheetIntent.putExtra("FRAMESIZE", _frameSizeString);
datasheetIntent.putExtra("PART NUMBER", _mGetEditValue);
Constant.putAllValue(_productString, _hpString, _rpmString, _voltageString, _frameSizeString,_mGetEditValue);
startActivity(datasheetIntent);
} else {
if(saveStateBoolea)
{
ImageFragment rightFrag = (ImageFragment) getFragmentManager().findFragmentByTag("imageFragmentTag");
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.remove(rightFrag);
ft.commit();
saveStateBoolea=false;
}else if(saveState.equalsIgnoreCase("SavedInstance")&&(rotateSaveInstace==true))
{
ImageFragment rightFrag = (ImageFragment) getFragmentManager().findFragmentByTag("imageFragmentTag");
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.remove(rightFrag);
ft.commit();
rotateSaveInstace=false;
}
DataSheetScreenFragment dataSheetFragment = new DataSheetScreenFragment();
fragmentTransaction = this.getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.top_right_datasheet_relative_layout, dataSheetFragment, "rightDrawingFragmentTag"); //First parameter is the container id
fragmentTransaction.addToBackStack("1");
fragmentTransaction.show(dataSheetFragment);
fragmentTransaction.commit();
Constant.putAllValue(_productString, _hpString, _rpmString, _voltageString, _frameSizeString,_mGetEditValue);
_pdfIcon=(ImageButton)this.getActivity().findViewById(R.id.pdf_icon);
_pdfIcon.setVisibility(View.VISIBLE);
_pdfText=(TextView)this.getActivity().findViewById(R.id.pdf_txt);
_pdfText.setVisibility(View.VISIBLE);
}
resetValue();
}
public void onNothingSelected(AdapterView<?> arg0) {
Toast.makeText(this.getActivity(), "No select", Toast.LENGTH_LONG).show();
}
@Override
public void onDestroy() {
_eCatalogueTable.close();
super.onDestroy();
}
@Override
public void onResume() {
super.onResume();
if(!Constant.checkPdf)
{
_productSpinner.setSelection(0);
}
}
public void serverResponse(String response, int processid) {
Message msg = new Message();
msg.arg2 = processid;
msg.obj = response;
_handler .sendMessage(msg);
}
@Override
public void onPause() {
super.onPause();
}
}