在 Bundle 中传递多个值，最后一个字符串中分配的值被传递给所有字符串
Passing Multiple value in Bundle, value assigned in last String is getting passed to all string
我正在尝试通过 Bundle 将 9 个字符串从一个 java class 传递到另一个 class。但是在另一个屏幕中，分配给最后一个额外内容的值被所有其他字符串覆盖。
Class1
public class HomeScreen extends AppCompatActivity {
public static String Buy_Price;
public static String Sell_Price;
public static String QUANTITY;
public static String BROKERAGE;
public static String ActualProfitLoss_String;
public static String TurnOver_String;
public static String STT_String;
public static String ServiceTax_String;
public static String TotalCharge_String;
public static String x;
private static String Strin ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_screen);
}
public void calculateProfit(View view) {
Intent intent = new Intent(this, displayProfit.class);
Bundle extras =new Bundle();
EditText editText=(EditText) findViewById(R.id.editText);
EditText editText4=(EditText) findViewById(R.id.editText4);
EditText editText2=(EditText) findViewById(R.id.editText2);
EditText editText3=(EditText) findViewById(R.id.editText3);
String buyPriceString = editText3.getText().toString();
Float BuyPrice = Float.parseFloat(buyPriceString);
String quantityString = editText2.getText().toString();
Float Quantity = Float.parseFloat(quantityString);
String sellPriceString = editText4.getText().toString();
Float SellPrice = Float.parseFloat(sellPriceString);
String brokerageString = editText.getText().toString();
Float Brokerage = Float.parseFloat(brokerageString);
double TurnOver=(BuyPrice*Quantity)+(SellPrice*Quantity);
double Sell1 =SellPrice-(SellPrice*(Brokerage/100));
double Buy1 = BuyPrice+(BuyPrice*(Brokerage/100));
double TotalBrokerage = ((Sell1*.03)+(Buy1*0.3));
double STT = (Quantity*(SellPrice-(SellPrice*(Brokerage/100))))*(.025/100);
double TrnxChrge = TurnOver*(0.00275/100);
double ServiceTax = (TotalBrokerage+STT)*(15/100);
double SEBICharge = (TurnOver*(.0002/100));
double TotalCharge = ServiceTax+TrnxChrge+SEBICharge+STT;
double NetProfit = (Sell1-Buy1)*Quantity;
double ActualProfitLoss = (NetProfit -TotalCharge);
String ActualProfitLossString=Double.toString(ActualProfitLoss);
String TurnOverString=Double.toString(TurnOver);
String STTString=Double.toString(STT);
String ServiceTaxString=Double.toString(ServiceTax);
String TotalChargeString=Double.toString(TotalCharge);
extras.putString(ActualProfitLoss_String,ActualProfitLossString);
extras.putString(TurnOver_String,TurnOverString);
extras.putString(STT_String,STTString);
extras.putString(ServiceTax_String,ServiceTaxString);
extras.putString(TotalCharge_String,TotalChargeString);
extras.putString(Buy_Price,buyPriceString);
extras.putString(Sell_Price,sellPriceString);
extras.putString(BROKERAGE,brokerageString);
extras.putString(QUANTITY,quantityString);
intent.putExtras(extras);
startActivity(intent);
}
Class 2:
public class displayProfit extends AppCompatActivity {
private static String Strin ;
protected void onCreate(Bundle savedInstanceState) {
Log.d(Strin, "buyPrice :::");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_profit);
Intent intent =getIntent();
Bundle extras = intent.getBundleExtra(HomeScreen.x);
String Buy_Price = extras.getString(HomeScreen.Buy_Price);
String Sell_Price = extras.getString(HomeScreen.Sell_Price);
String QUANTITY = extras.getString(HomeScreen.QUANTITY);
String BROKERAGE = extras.getString(HomeScreen.BROKERAGE);
String ActualProfitLoss_String = extras.getString(HomeScreen.ActualProfitLoss_String);
String TurnOver_String = extras.getString(HomeScreen.TurnOver_String);
String STT_String = extras.getString(HomeScreen.STT_String);
String ServiceTax_String = extras.getString(HomeScreen.ServiceTax_String);
String TotalCharge_String = extras.getString(HomeScreen.TotalCharge_String);
TextView Buy_Price1= (TextView) findViewById(R.id.Buy_Price1);
TextView Sell_Price1= (TextView) findViewById(R.id.Sell_Price1);
TextView QUANTITY1= (TextView) findViewById(R.id.QUANTITY1);
TextView BROKERAGE1= (TextView) findViewById(R.id.BROKERAGE1);
TextView ActualProfitLoss_String1= (TextView) findViewById(R.id.ActualProfitLoss_String1);
TextView TurnOver_String1= (TextView) findViewById(R.id.TurnOver_String1);
TextView STT_String1= (TextView) findViewById(R.id.STT_String1);
TextView ServiceTax_String1= (TextView) findViewById(R.id.ServiceTax_String1);
TextView TotalCharge_String1= (TextView) findViewById(R.id.TotalCharge_String1);
Buy_Price1.setText(Buy_Price);
Sell_Price1.setText(Sell_Price);
QUANTITY1.setText(QUANTITY);
BROKERAGE1.setText(BROKERAGE);
ActualProfitLoss_String1.setText(ActualProfitLoss_String);
TurnOver_String1.setText(TurnOver_String);
STT_String1.setText(STT_String);
ServiceTax_String1.setText(ServiceTax_String);
TotalCharge_String1.setText(TotalCharge_String);
}
}
在 class2 的末尾，我放置了日志，发现所有字符串都填充了分配给 QUANTITY 的值。
请澄清以上内容。如果您需要更多代码，将共享相同的代码。
Logs for the same after changing the Class1 as suggested in answer
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
I/art: Background sticky concurrent mark sweep GC freed 25273(2MB) AllocSpace objects, 15(264KB) LOS objects, 44% free, 4MB/8MB, paused 14.345ms total 168.562ms
[ 02-20 23:21:14.614 3314: 3314 D/ ]
buyPrice :::
[ 02-20 23:21:14.861 3314: 3314 D/ ]
NotNull::::::
D/AndroidRuntime: Shutting down VM
--------- beginning of crash
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.tax, PID: 3314
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.tax/com.test.tax.displayProfit}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at com.test.tax.displayProfit.onCreate(displayProfit.java:29)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Disconnected from the target VM, address: 'localhost:8625', transport: 'socket'
只需使用 唯一 值初始化您用于将项目添加到 Bundle 中的所有上述 public static Strings，否则它们将相互覆盖。例如
public static String Buy_Price = "a";
public static String Sell_Price = "b";
public static String QUANTITY = "c";
public static String BROKERAGE = "d";
public static String ActualProfitLoss_String = "e";
public static String TurnOver_String = "f";
public static String STT_String = "g";
public static String ServiceTax_String = "h";
public static String TotalCharge_String = "i";
public static String x = = "j";
此外，理想情况下它们应该是 public static final String。请考虑也使用一致的命名约定 (TOTAL_CHARGE、TURN_OVER)。
你可以把Bundle想象成一个Map，如果你用相同的键放置值，值将被覆盖。这就是为什么你得到所有键的 QUANTITY 值的原因，因为所有键都是空的（相等的）并且 QUANTITY 是你放入 Bundle.[=28 的最后一个键=]
编辑：
对于 NullPointerException.
在 Class 1 (HomeScreen) 中，在 calculateProfit(View view) 方法中，您将 Bundle 放入 Intent 中，无需使用密钥。
intent.putExtras(extras);
然后在 Class 2 (displayProfit) inside onCreate(Bundle savedInstanceState) 你得到 Bundle from the Intent with a key.
intent.getBundleExtra(HomeScreen.x);
所以像这样在 HomeScreen 中使用相同的键放置 extras
intent.putExtra(HomeScreen.x, extras);
我正在尝试通过 Bundle 将 9 个字符串从一个 java class 传递到另一个 class。但是在另一个屏幕中，分配给最后一个额外内容的值被所有其他字符串覆盖。
Class1
public class HomeScreen extends AppCompatActivity {
public static String Buy_Price;
public static String Sell_Price;
public static String QUANTITY;
public static String BROKERAGE;
public static String ActualProfitLoss_String;
public static String TurnOver_String;
public static String STT_String;
public static String ServiceTax_String;
public static String TotalCharge_String;
public static String x;
private static String Strin ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_screen);
}
public void calculateProfit(View view) {
Intent intent = new Intent(this, displayProfit.class);
Bundle extras =new Bundle();
EditText editText=(EditText) findViewById(R.id.editText);
EditText editText4=(EditText) findViewById(R.id.editText4);
EditText editText2=(EditText) findViewById(R.id.editText2);
EditText editText3=(EditText) findViewById(R.id.editText3);
String buyPriceString = editText3.getText().toString();
Float BuyPrice = Float.parseFloat(buyPriceString);
String quantityString = editText2.getText().toString();
Float Quantity = Float.parseFloat(quantityString);
String sellPriceString = editText4.getText().toString();
Float SellPrice = Float.parseFloat(sellPriceString);
String brokerageString = editText.getText().toString();
Float Brokerage = Float.parseFloat(brokerageString);
double TurnOver=(BuyPrice*Quantity)+(SellPrice*Quantity);
double Sell1 =SellPrice-(SellPrice*(Brokerage/100));
double Buy1 = BuyPrice+(BuyPrice*(Brokerage/100));
double TotalBrokerage = ((Sell1*.03)+(Buy1*0.3));
double STT = (Quantity*(SellPrice-(SellPrice*(Brokerage/100))))*(.025/100);
double TrnxChrge = TurnOver*(0.00275/100);
double ServiceTax = (TotalBrokerage+STT)*(15/100);
double SEBICharge = (TurnOver*(.0002/100));
double TotalCharge = ServiceTax+TrnxChrge+SEBICharge+STT;
double NetProfit = (Sell1-Buy1)*Quantity;
double ActualProfitLoss = (NetProfit -TotalCharge);
String ActualProfitLossString=Double.toString(ActualProfitLoss);
String TurnOverString=Double.toString(TurnOver);
String STTString=Double.toString(STT);
String ServiceTaxString=Double.toString(ServiceTax);
String TotalChargeString=Double.toString(TotalCharge);
extras.putString(ActualProfitLoss_String,ActualProfitLossString);
extras.putString(TurnOver_String,TurnOverString);
extras.putString(STT_String,STTString);
extras.putString(ServiceTax_String,ServiceTaxString);
extras.putString(TotalCharge_String,TotalChargeString);
extras.putString(Buy_Price,buyPriceString);
extras.putString(Sell_Price,sellPriceString);
extras.putString(BROKERAGE,brokerageString);
extras.putString(QUANTITY,quantityString);
intent.putExtras(extras);
startActivity(intent);
}
Class 2:
public class displayProfit extends AppCompatActivity {
private static String Strin ;
protected void onCreate(Bundle savedInstanceState) {
Log.d(Strin, "buyPrice :::");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_profit);
Intent intent =getIntent();
Bundle extras = intent.getBundleExtra(HomeScreen.x);
String Buy_Price = extras.getString(HomeScreen.Buy_Price);
String Sell_Price = extras.getString(HomeScreen.Sell_Price);
String QUANTITY = extras.getString(HomeScreen.QUANTITY);
String BROKERAGE = extras.getString(HomeScreen.BROKERAGE);
String ActualProfitLoss_String = extras.getString(HomeScreen.ActualProfitLoss_String);
String TurnOver_String = extras.getString(HomeScreen.TurnOver_String);
String STT_String = extras.getString(HomeScreen.STT_String);
String ServiceTax_String = extras.getString(HomeScreen.ServiceTax_String);
String TotalCharge_String = extras.getString(HomeScreen.TotalCharge_String);
TextView Buy_Price1= (TextView) findViewById(R.id.Buy_Price1);
TextView Sell_Price1= (TextView) findViewById(R.id.Sell_Price1);
TextView QUANTITY1= (TextView) findViewById(R.id.QUANTITY1);
TextView BROKERAGE1= (TextView) findViewById(R.id.BROKERAGE1);
TextView ActualProfitLoss_String1= (TextView) findViewById(R.id.ActualProfitLoss_String1);
TextView TurnOver_String1= (TextView) findViewById(R.id.TurnOver_String1);
TextView STT_String1= (TextView) findViewById(R.id.STT_String1);
TextView ServiceTax_String1= (TextView) findViewById(R.id.ServiceTax_String1);
TextView TotalCharge_String1= (TextView) findViewById(R.id.TotalCharge_String1);
Buy_Price1.setText(Buy_Price);
Sell_Price1.setText(Sell_Price);
QUANTITY1.setText(QUANTITY);
BROKERAGE1.setText(BROKERAGE);
ActualProfitLoss_String1.setText(ActualProfitLoss_String);
TurnOver_String1.setText(TurnOver_String);
STT_String1.setText(STT_String);
ServiceTax_String1.setText(ServiceTax_String);
TotalCharge_String1.setText(TotalCharge_String);
}
}
在 class2 的末尾，我放置了日志，发现所有字符串都填充了分配给 QUANTITY 的值。
请澄清以上内容。如果您需要更多代码，将共享相同的代码。
Logs for the same after changing the Class1 as suggested in answer
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection W/IInputConnectionWrapper: finishComposingText on inactive InputConnection W/IInputConnectionWrapper: finishComposingText on inactive InputConnection I/art: Background sticky concurrent mark sweep GC freed 25273(2MB) AllocSpace objects, 15(264KB) LOS objects, 44% free, 4MB/8MB, paused 14.345ms total 168.562ms
[ 02-20 23:21:14.614 3314: 3314 D/ ]buyPrice :::
[ 02-20 23:21:14.861 3314: 3314 D/ ] NotNull:::::: D/AndroidRuntime: Shutting down VM
--------- beginning of crashE/AndroidRuntime: FATAL EXCEPTION: main Process: com.test.tax, PID: 3314 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.tax/com.test.tax.displayProfit}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference at com.test.tax.displayProfit.onCreate(displayProfit.java:29) at android.app.Activity.performCreate(Activity.java:6662) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Disconnected from the target VM, address: 'localhost:8625', transport: 'socket'
只需使用 唯一 值初始化您用于将项目添加到 Bundle 中的所有上述 public static Strings，否则它们将相互覆盖。例如
public static String Buy_Price = "a";
public static String Sell_Price = "b";
public static String QUANTITY = "c";
public static String BROKERAGE = "d";
public static String ActualProfitLoss_String = "e";
public static String TurnOver_String = "f";
public static String STT_String = "g";
public static String ServiceTax_String = "h";
public static String TotalCharge_String = "i";
public static String x = = "j";
此外，理想情况下它们应该是 public static final String。请考虑也使用一致的命名约定 (TOTAL_CHARGE、TURN_OVER)。
你可以把Bundle想象成一个Map，如果你用相同的键放置值，值将被覆盖。这就是为什么你得到所有键的 QUANTITY 值的原因，因为所有键都是空的（相等的）并且 QUANTITY 是你放入 Bundle.[=28 的最后一个键=]
编辑：
对于 NullPointerException.
在 Class 1 (HomeScreen) 中，在 calculateProfit(View view) 方法中，您将 Bundle 放入 Intent 中，无需使用密钥。
intent.putExtras(extras);
然后在 Class 2 (displayProfit) inside onCreate(Bundle savedInstanceState) 你得到 Bundle from the Intent with a key.
intent.getBundleExtra(HomeScreen.x);
所以像这样在 HomeScreen 中使用相同的键放置 extras
intent.putExtra(HomeScreen.x, extras);