我已经在 android 2.3.6 (API 10) 上开发了我的应用程序，它工作正常，然后我退出 Activity，但它的服务在 1 小时后在后台执行，当我再次运行它然后它由于一些致命异常它强制停止但再次运行并正常工作。
请帮助我理解这个堆栈跟踪并帮助我解决这个问题。
提前致谢。
OnOffScreen 类：
public class OnOffScreen extends Activity {
private TextView txtDevId,txtdevTag,txtOnOffSt,btnonoffMain,lblAlarm,txtMonitor,txtVersion,txtOcc;
private TextView txtOnOffDevType,txtTimerApp,txtStartTime,txtStartAct,txtStopTime,txtStopAct;
private ListView lstDeviceInfo;
private Button btnReport,btnOn,btnOff,btnConfig,btnStatus;
@SuppressWarnings("unused")
private Context context;
private ExceptionDialog dlg;
private SharedPreferences prefs;
private DataBaseAdapter dba;
private UtilityFunction utility;
@SuppressWarnings("unused")
private ImageView imgMain;
private String DevId,SwId;
private Bundle bundle;
private SendSMS smsSend;
private SMSReceiver receivedSms;
private Cursor cursor,curCord;
private customCursorAdapter adpt;
private TableRow trSwitchId;
@SuppressWarnings("unused")
private ConstantClass ccl;
private static String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";
public OnOffScreen(){
dba = new DataBaseAdapter(this);
smsSend = new SendSMS(this);
receivedSms = new SMSReceiver(this);
utility = new UtilityFunction(this);
ccl = new ConstantClass();
}
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
final boolean isCsTitle = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.onoffscr);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
if(isCsTitle)
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title);
final TextView mtxTitle = (TextView)findViewById(R.id.lblMyTitle);
mtxTitle.setText("Device On/Off Screen");
ConstantClass.Clear_Main_Screen=false;
ConstantClass.afterSendGotoMain = true;
try{
if(dba.IsConOpenOrClose()==false)
dba.Open();
bundle = getIntent().getExtras();
if(bundle!=null){
DevId = bundle.getString("devIdTag");
SwId = bundle.getString("SwIdTag");
prefs = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("DeviceId", DevId);
editor.putString("SwitchId", SwId);
//////finally saved the data/////////
editor.commit();
}
txtDevId = (TextView)findViewById(R.id.txtOnScDevID);
txtdevTag = (TextView)findViewById(R.id.txtOnScDevTag);
txtOnOffSt = (TextView)findViewById(R.id.txtOnScDevStatus);
txtMonitor = (TextView) findViewById(R.id.txtOnScDevMonitor);
txtOnOffDevType = (TextView)findViewById(R.id.txtonoffDevType);
txtVersion = (TextView)findViewById(R.id.txtOnOffDevAppVer);
lstDeviceInfo = (ListView)findViewById(R.id.lstDeviceInfo);
lblAlarm = (TextView)findViewById(R.id.lblOnOffAlarm);
txtTimerApp = (TextView)findViewById(R.id.txtOnOffDevTimer);
txtOcc = (TextView)findViewById(R.id.txtOnOffDevOcc);
txtStartTime = (TextView)findViewById(R.id.txtOnOffStartTime);
txtStartAct = (TextView)findViewById(R.id.txtOnOffDevStartAct);
txtStopTime = (TextView)findViewById(R.id.txtOnOffDevStopTime);
txtStopAct = (TextView)findViewById(R.id.txtOnOffDevStopAct);
//imgMain = (ImageView)findViewById(R.id.imgOnOffDevice);
btnOn = (Button)findViewById(R.id.btnOnOffOn);
btnOff = (Button)findViewById(R.id.btnOnOffOff);
btnStatus = (Button)findViewById(R.id.btnStatus);
btnConfig = (Button)findViewById(R.id.btnOnOffConfig);
btnReport = (Button)findViewById(R.id.btnOnOffSeeReport);
btnonoffMain = (Button)findViewById(R.id.btnOnOffMain);
trSwitchId = (TableRow)findViewById(R.id.tbRowSwitchId);
btnOn.setOnClickListener(btnClick);
btnOn.setBackgroundResource(R.drawable.onbutton);
btnOff.setOnClickListener(btnClick);
btnOff.setBackgroundResource(R.drawable.offbutton);
btnStatus.setOnClickListener(btnClick);
btnStatus.setBackgroundResource(R.drawable.checkstatus);
btnConfig.setOnClickListener(btnClick);
btnonoffMain.setOnClickListener(btnClick);
btnReport.setOnClickListener(btnClick);
if(SwId.equals("0000")){
trSwitchId.setVisibility(TableRow.GONE);
}else
trSwitchId.setVisibility(TableRow.VISIBLE);
/************Filling the Coordinator number to cursor***************/
curCord = dba.getCoord(dba.CurrentWorkingCoordinator(DataBaseAdapter.Key_SendCoord, 1));
if(curCord!=null){
ConstantClass.address = curCord.getString(curCord.getColumnIndex(DataBaseAdapter.Key_MbNo)).toString();
startManagingCursor(curCord);
}
cursor = dba.SelFromDeviceStorage(DevId, SwId);
startManagingCursor(cursor);
if (cursor.getCount()>0){
fillControl(cursor);
}
String tag = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevTag));
String alarm =utility.ReturnAlarm(DevId, tag);
lblAlarm.setText(alarm);
lblAlarm.setFocusable(true);
lblAlarm.setOnClickListener(btnClick);
}catch(SQLiteException e){
Toast.makeText(this,e.getMessage(), Toast.LENGTH_SHORT).show();
}finally{
if(curCord!=null)
curCord.close();
}
}
View.OnClickListener btnClick = new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.lblOnOffAlarm:
if(lblAlarm.getText().toString()!=null){
dlg = new ExceptionDialog(OnOffScreen.this,"Alarm " ,lblAlarm.getText().toString());
dlg.show();
}
break;
case R.id.btnOnOffOn:
try{
//ConstantClass.address = "5556";
if (ConstantClass.timer != null)
ConstantClass.timer.cancel();
ConstantClass.timer = new Timer();
ConstantClass.timer.schedule(new AuditTimerTask(OnOffScreen.this), 300000);
String msg = "<"+Integer.toHexString(26)+"3" + txtDevId.getText().toString() + SwId + Integer.toHexString(1)+">";
smsSend.send_SMS( msg.toUpperCase());
////////go to mainn Screen //////
}catch(Exception e){
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
break;
case R.id.btnOnOffOff:
try{
//ConstantClass.address = "5556";
if (ConstantClass.timer != null)
ConstantClass.timer.cancel();
ConstantClass.timer = new Timer();
ConstantClass.timer.schedule(new AuditTimerTask(OnOffScreen.this),300000);
String msg = "<"+Integer.toHexString(26)+"3" + txtDevId.getText().toString() + SwId + Integer.toHexString(0)+">";
smsSend.send_SMS( msg.toUpperCase());
//////////now going to Main Screen//////////////
}catch(Exception e){
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
break;
case R.id.btnStatus:
try{
if (ConstantClass.timer != null)
ConstantClass.timer.cancel();
ConstantClass.timer = new Timer();
ConstantClass.timer.schedule(new AuditTimerTask(OnOffScreen.this),300000);
String msg = "<"+Integer.toHexString(26)+"3" + txtDevId.getText().toString() + SwId + Integer.toHexString(9)+">";
smsSend.send_SMS( msg.toUpperCase());
}catch(Exception e){
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
break;
case R.id.btnOnOffConfig:
/*
* code for go on to the Config Device Screen from OnOffScreen *
*/
Intent onOffConfig = new Intent(OnOffScreen.this,ConfigDevice.class);
onOffConfig.putExtra("DeviceId", txtDevId.getText().toString());
onOffConfig.putExtra("SwId", SwId);
OnOffScreen.this.startActivity(onOffConfig);
break;
case R.id.btnOnOffMain:
/*
* code for go on to main Zigbee Activity Class from the OnOffScreen *
*/
try{
Intent onOffMain = new Intent(OnOffScreen.this,ZigbeeActivity.class);
onOffMain.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
if(dba.IsConOpenOrClose()==false)
dba.Open();
String sQuery = new String("UPDATE " + ConstantClass.dbName[3] + " SET " + DataBaseAdapter.Key_AlarmID + " = " + "0" +
" WHERE " + DataBaseAdapter.Key_AlarmDevID + " = ?");
dba.UpdateQuery(sQuery, DevId);
OnOffScreen.this.startActivity(onOffMain);
}catch(Exception e){
Toast.makeText(OnOffScreen.this, "On OffScreen " + e.getMessage(),Toast.LENGTH_LONG).show();
}
break;
case R.id.btnOnOffSeeReport:
Intent rptInt = new Intent(OnOffScreen.this,ReportHistory.class);
String dTag = null,stag = null,devsr=null, pic=null;
if(cursor!=null){
DevId = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevID));
SwId = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_SwID));
dTag = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevTag));
stag = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_SwTag));
devsr = String.valueOf(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevSr)));
pic = String.valueOf(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevPic)));
rptInt.putExtra("DeviceID",DevId);
rptInt.putExtra("SwitchId", SwId);
rptInt.putExtra("DeviceTag", dTag);
rptInt.putExtra("SwitchTag",stag );
rptInt.putExtra("DeviceSr", devsr);
rptInt.putExtra("DevicePic", pic);
OnOffScreen.this.startActivity(rptInt);
}
else
OnOffScreen.this.startActivity(rptInt);
break;
}
}
};
@Override
public void onStart(){
super.onStart();
///////registering the Receiver for sms receiving///////////
registerReceiver(smsSend.sms_send,smsSend.getSentIntentFilter());
registerReceiver(smsSend.sms_delivered,smsSend.getDeliveredFilter());
IntentFilter filter = new IntentFilter(SMS_RECEIVED);
registerReceiver(receivedSms,filter);
}
@Override
public void onResume(){
super.onResume();
try{
dba.Open();
//////loading the prefrences////////
SharedPreferences prefs = getPreferences(MODE_PRIVATE);
DevId = prefs.getString("DeviceId", "");
SwId = prefs.getString("SwitchId", "");
cursor = dba.SelFromDeviceStorage(DevId, SwId);
startManagingCursor(cursor);
if (cursor.getCount()>0){
fillControl(cursor);
}
}catch(Exception e){
Log.d("Resume On Off", e.getMessage());
}
}
@Override
public void onPause(){
super.onPause();
if(cursor!=null)
cursor.close();
ConstantClass.Clear_Main_Screen = true;
}
@Override
public void onBackPressed(){
try{
Intent onOffMain = new Intent(OnOffScreen.this,ZigbeeActivity.class);
onOffMain.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
if(dba.IsConOpenOrClose()==false)
dba.Open();
String sQuery = new String("UPDATE " + ConstantClass.dbName[3] + " SET " + DataBaseAdapter.Key_AlarmID + " = " + "0" +
" WHERE " + DataBaseAdapter.Key_AlarmDevID + " = ?");
dba.UpdateQuery(sQuery, DevId);
OnOffScreen.this.startActivity(onOffMain);
}catch(Exception e){
Toast.makeText(OnOffScreen.this, "On OffScreen " + e.getMessage(),Toast.LENGTH_LONG).show();
}
}
@Override
public void onDestroy(){
super.onDestroy();
unregisterReceiver(receivedSms);
unregisterReceiver(smsSend.sms_send);
unregisterReceiver(smsSend.sms_delivered);
if(cursor!=null)
cursor.close();
if(dba!=null)
dba.Close();
}
public String setDtTime(String temp){
String dd,mm,yy,hh,min;
dd = temp.substring(0, 2);
mm = temp.substring(2, 4);
int mon = Integer.valueOf(mm);
mm = Integer.toString(mon+1);
if(mm.length()!=2)
mm = "0" + mm;
yy = temp.substring(4, 6);
hh = temp.substring(6, 8);
min = temp.substring(8, 10);
return dd+"/" + mm + "/" + yy + " " + hh + ":" + min;
}
public void fillControl(Cursor cursor){
try{
if(cursor!=null)
cursor.moveToFirst();
adpt = new customCursorAdapter(this,cursor);
lstDeviceInfo.setAdapter(adpt);
txtDevId.setText(cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevID)).toString());
txtDevId.setTextColor(Color.BLACK);
txtdevTag.setText(cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevTag)));
txtdevTag.setTextColor(Color.BLACK);
if(cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_SwID)).toString().equals("0000")){
txtOnOffDevType.setText("Plug");
}else
txtOnOffDevType.setText("Switch");
txtOnOffDevType.setTextColor(Color.BLACK);
if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOnOff))==1)
txtOnOffSt.setText("ON");
else
txtOnOffSt.setText("OFF");
txtMonitor.setTextColor(Color.BLACK);
if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevRu))==1)
txtMonitor.setText("Yes");
else
txtMonitor.setText("NO");
txtOnOffSt.setTextColor(Color.BLACK);
if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevTmr))==2)
txtTimerApp.setText("Yes");
else
txtTimerApp.setText("NO");
txtTimerApp.setTextColor(Color.BLACK);
if((cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOc))==1)|| cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOc))==0){
txtOcc.setText("Once");
}else if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOc))==2){
txtOcc.setText("Daily");
}else if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOc))==4){
txtOcc.setText("Annualy");
}else
txtOcc.setText("Weakly");
txtOcc.setTextColor(Color.BLACK);
String onTime = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevOnTm)).toString();
/* for catching the On Status Device */
txtStartTime.setText(setDtTime( onTime));
txtStartTime.setTextColor(Color.BLACK);
if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOnSt))==1)
txtStartAct.setText("ON");
else
txtStartAct.setText("OFF");
txtStartAct.setTextColor(Color.BLACK);
String offTime =cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevOffTm)).toString();
/* for getting the timer Off act from the dbase*/
txtStopTime.setText(setDtTime(offTime));
txtStopTime.setTextColor(Color.BLACK);
if(cursor.getInt(cursor.getColumnIndex(DataBaseAdapter.Key_DevOffSt))==1)
txtStopAct.setText("ON");
else
txtStopAct.setText("OFF");
txtStopAct.setTextColor(Color.BLACK);
String tem = cursor.getString(cursor.getColumnIndex(DataBaseAdapter.Key_DevVersion));
txtVersion.setText(tem.substring(0, 1)+ "." + tem.substring(1, 2) + "." + tem.substring(2));
txtVersion.setTextColor(Color.BLACK);
}catch(Exception e){
Toast.makeText(getApplicationContext(), e.getMessage(), Toast.LENGTH_LONG).show();
}
}
}
堆栈跟踪：
06-15 14:37:35.734: E/AndroidRuntime(31310): FATAL EXCEPTION: main
06-15 14:37:35.734: E/AndroidRuntime(31310): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zigbee/com.zigbee.OnOffScreen}: java.lang.NullPointerException
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.os.Handler.dispatchMessage(Handler.java:99)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.os.Looper.loop(Looper.java:130)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.ActivityThread.main(ActivityThread.java:3687)
06-15 14:37:35.734: E/AndroidRuntime(31310): at java.lang.reflect.Method.invokeNative(Native Method)
06-15 14:37:35.734: E/AndroidRuntime(31310): at java.lang.reflect.Method.invoke(Method.java:507)
06-15 14:37:35.734: E/AndroidRuntime(31310): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
06-15 14:37:35.734: E/AndroidRuntime(31310): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
06-15 14:37:35.734: E/AndroidRuntime(31310): at dalvik.system.NativeStart.main(Native Method)
06-15 14:37:35.734: E/AndroidRuntime(31310): Caused by: java.lang.NullPointerException
06-15 14:37:35.734: E/AndroidRuntime(31310): at com.zigbee.OnOffScreen.onCreate(OnOffScreen.java:122)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-15 14:37:35.734: E/AndroidRuntime(31310): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
06-15 14:37:35.734: E/AndroidRuntime(31310): ... 11 more