0
我正在爲我的移動應用程序開發最終項目開發一個android應用程序，該應用程序明天到期，並且遇到問題。直到昨天，我的應用程序才能在我的手機上正常工作，但從那以後，我不知何故弄糟了一些東西。該程序完美運行，並且在模擬器上完成了我需要的所有功能，即使在我從昨天開始添加的所有內容之後，我都認爲該應用程序已完成並準備就緒。不過，我跑了今天我的手機上，發現應用程序是在啓動下列活動崩潰......Android應用程序崩潰，沒有logcat錯誤
public class OrderDetails extends AppCompatActivity {
private List<PhoneBook> contactList;
private ListView listView;
private TextView name, number, address, orderTotal, amountReceived, tip, mileage, grandTotal;
private Button add;
private PhonebookAdapter adapter;
PhoneBookHandler db;
double dAmountReceived;
double dTotalCost;
double dSubtract;
double dMileage;
double dGrandTotal;
double dTip;
double dAdd;
double dMilesDriven;
double dMultiply;
double dRatePerMile;
String sAmountReceived;
String sTotalCost;
String sTip;
String sMileage;
String sGrandTotal;
String sAddress;
String ratePerDelivery;
String ratePerMile;
String milesDriven;
EditText eAmountReceived;
EditText eTotalCost;
EditText eTip;
EditText eMileage;
EditText eAddress;
EditText eGrandTotal;
EditText eMilesDriven;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order_details);
listView = (ListView) findViewById(R.id.contactlist);
db = new PhoneBookHandler(this);
contactList = db.getAllContacts();
adapter = new PhonebookAdapter(this, contactList);
eAddress = (EditText) findViewById(R.id.address);
eTotalCost = (EditText) findViewById(R.id.orderTotal);
eAmountReceived = (EditText) findViewById(R.id.amountReceived);
eTip = (EditText) findViewById(R.id.tip);
eMileage = (EditText) findViewById(R.id.mileage);
eGrandTotal = (EditText) findViewById(R.id.grandTotal);
eMilesDriven = (EditText) findViewById(R.id.milesDriven);
// use shared preferences to inflate mileage edittext with data entered in settings menu
ratePerDelivery = PreferenceManager.getDefaultSharedPreferences(this).getString("ratePerDeliveryPref", null);
ratePerMile = PreferenceManager.getDefaultSharedPreferences(this).getString("ratePerMilePref", null);
eAmountReceived.addTextChangedListener(new TextWatcher()
{
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after){}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count){}
@Override
public void afterTextChanged(Editable s)
{
if (getCurrentFocus() == eAmountReceived)
{
sAmountReceived = eAmountReceived.getText().toString();
sTotalCost = eTotalCost.getText().toString();
sMileage = eMileage.getText().toString();
sTip = eTip.getText().toString();
try
{
dAmountReceived = Double.parseDouble(sAmountReceived);
dTotalCost = Double.parseDouble(sTotalCost);
dSubtract = dAmountReceived - dTotalCost;
dMileage = Double.parseDouble(sMileage);
dGrandTotal = dSubtract + dMileage;
} catch(NumberFormatException e){}
sTip = String.valueOf(dSubtract);
DecimalFormat df = new DecimalFormat("0.00");
sTip = df.format(dSubtract);
eTip.setText(sTip);
sGrandTotal = String.valueOf(dGrandTotal);
sGrandTotal = df.format(dGrandTotal);
eGrandTotal.setText(sGrandTotal);
}
}
});
eTip.addTextChangedListener(new TextWatcher()
{
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after){}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count){}
@Override
public void afterTextChanged(Editable s) {
if (getCurrentFocus() == eTip)
{
sAmountReceived = eAmountReceived.getText().toString();
sTotalCost = eTotalCost.getText().toString();
sMileage = eMileage.getText().toString();
sTip = eTip.getText().toString();
try {
dTip = Double.parseDouble(sTip);
dTotalCost = Double.parseDouble(sTotalCost);
dAdd = dTotalCost + dTip;
dMileage = Double.parseDouble(sMileage);
dGrandTotal = dTip + dMileage;
} catch (NumberFormatException e) {
}
sAmountReceived = String.valueOf(dAdd);
DecimalFormat df = new DecimalFormat("0.00");
sAmountReceived = df.format(dAdd);
eAmountReceived.setText(sAmountReceived);
sGrandTotal = String.valueOf(dGrandTotal);
sGrandTotal = df.format(dGrandTotal);
eGrandTotal.setText(sGrandTotal);
}
}
});
if (ratePerMile.equals("") && !ratePerDelivery.equals(""))
{
eMileage.setText(ratePerDelivery);
}
else
{
eMilesDriven.addTextChangedListener(new TextWatcher()
{
@Override
public void beforeTextChanged(CharSequence s, int start,
int count, int after){}
@Override
public void onTextChanged(CharSequence s, int start,
int before, int count){}
@Override
public void afterTextChanged(Editable s)
{
if (getCurrentFocus() == eMilesDriven)
{
sAmountReceived = eAmountReceived.getText().toString();
sTotalCost = eTotalCost.getText().toString();
sMileage = eMileage.getText().toString();
sTip = eTip.getText().toString();
try
{
milesDriven = eMilesDriven.getText().toString();
dMilesDriven = Double.parseDouble(milesDriven);
dRatePerMile = Double.parseDouble(ratePerMile);
dMultiply = dRatePerMile * dMilesDriven;
dGrandTotal = dSubtract + dMultiply;
} catch(NumberFormatException e){}
sMileage = String.valueOf(dMultiply);
DecimalFormat df = new DecimalFormat("0.00");
sMileage = df.format(dMultiply);
eMileage.setText(sMileage);
sGrandTotal = String.valueOf(dGrandTotal);
sGrandTotal = df.format(dGrandTotal);
eGrandTotal.setText(sGrandTotal);
}
}
});
}
}
public void onClick(View view)
{
name = (EditText) findViewById(R.id.name);
number = (EditText) findViewById(R.id.number);
address = (EditText) findViewById(R.id.address);
orderTotal = (EditText) findViewById(R.id.orderTotal);
amountReceived = (EditText) findViewById(R.id.amountReceived);
tip = (EditText) findViewById(R.id.tip);
mileage = (EditText) findViewById(R.id.mileage);
grandTotal = (EditText) findViewById(R.id.grandTotal);
String cName = name.getText().toString();
String num = number.getText().toString();
String cAddress = address.getText().toString();
String cOrderTotal = orderTotal.getText().toString();
String cAmountReceived = amountReceived.getText().toString();
String cTip = tip.getText().toString();
String cMileage = mileage.getText().toString();
String cGrandTotal = grandTotal.getText().toString();
int id = db.addContact(new PhoneBook(cName, num, cAddress, cOrderTotal,
cAmountReceived, cTip, cMileage, cGrandTotal));
contactList.add(new PhoneBook(id, cName, num, cAddress, cOrderTotal,
cAmountReceived, cTip, cMileage, cGrandTotal));
adapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), "Entry Successfully Created.", Toast.LENGTH_LONG).show();
}
public void buttonClickFunction(View v)
{
Intent intent = new Intent(getApplicationContext(), display_database.class);
startActivity(intent);
}
public void sendMessage(View v)
{
eAddress = (EditText) findViewById(R.id.address);
sAddress = eAddress.getText().toString();
String map = "http://maps.google.com/maps?q=" + sAddress;
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(map));
startActivity(intent);
}
}
因爲昨天我已經加入的唯一的事情是對「eMilesDriven」設置TextWatcher將進行計算的變量。我唯一能想到的另一件事是，我今天改變了我的啓動器圖標，但是應用程序中的其他所有內容都正常工作，所以我不確定它是如此。我只是不明白爲什麼它在我的模擬器上完美地運行，並在我的手機上崩潰。我重新啓動了Android Studio幾次，並從手機上刪除了應用程序，並嘗試重新啓動它，但每次它都沒有提供logcat erros。我將不勝感激任何幫助。如果明天我無法解決它，我可能只需要在模擬器上展示我的應用程序，但我真的很想知道它爲什麼會崩潰。
編輯：的logcat的誤差如下：
FATAL EXCEPTION: main
Process: com.example.boley.databaseexample, PID: 15335
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.boley.databaseexample/com.example.boley.personaldeliveryassistant.OrderDetails}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at com.example.boley.personaldeliveryassistant.OrderDetails.onCreate(OrderDetails.java:173)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
從「只顯示選定的應用程序」 - >「無過濾器」更改您的Android監視器篩選器..總是有錯誤顯示 – ZeroOne
謝謝你。我不知道。我將用stacktrace更新我的問題。 –