如何通过 Intent 转移到 nex Activity
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【中文标题】如何通过 Intent 转移到 nex Activity【英文标题】：How can I move to nex Activity through Intent 【发布时间】：2021-06-12 06:44:19 【问题描述】：我正在尝试制作银行应用程序，并且正在尝试制作 Success Activity，当我尝试从 MainActivity.java 移动到 SuccessActivity.java 时，我得到一个空白页。
这是我的 MainActivity.java：
package com.example.bankapp.ui;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.example.bankapp.R;
import com.example.bankapp.data.AccountRepository;
import com.example.bankapp.databinding.ActivityMainBinding;
import com.example.bankapp.domain.BankAccount;
import com.example.bankapp.domain.SuccessPayment;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.UUID;
public class MainActivity extends AppCompatActivity
private ActivityMainBinding binding;
private BankAccount bankAccount;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
bankAccount = new AccountRepository().getAccount();
binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
bindBankDataToRadioButtons(bankAccount);
bindBankDataToViews(bankAccount);
binding.rbGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
@Override
public void onCheckedChanged(RadioGroup group, int checkedId)
binding.bnpagar.setEnabled(true);
if (checkedId == R.id.rbotraCantidad)
binding.etnuevaCantidad.setVisibility(View.VISIBLE);
binding.ingreseCantidad.setVisibility(View.VISIBLE);
else
binding.etnuevaCantidad.setVisibility(View.GONE);
binding.ingreseCantidad.setVisibility(View.GONE);
);
binding.bnpagar.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
double amountToPay = getAmountToPay();
if (amountToPay == -1.0)
showToastMessage(getString(R.string.err_cantidadIncorrecta));
else if (amountToPay <= bankAccount.getAccountBalance())
SuccessPayment successPayment = makePayment(amountToPay, bankAccount);
Intent intent = new Intent(getApplicationContext(), SuccessActivity.class);
intent.putExtra("SUCCESS_EXTRA", successPayment);
startActivity(intent);
finish();
else
showToastMessage(getString(R.string.err_saldoInsuficiente));
);
private double getAmountToPay()
double amount;
switch (binding.rbGroup.getCheckedRadioButtonId())
case R.id.rbdeudaActual:
amount = bankAccount.getCurrentDebt();
break;
case R.id.rbsinInteres:
amount = bankAccount.getMinimumPaymentDue();
break;
case R.id.rbpagoMinimo:
amount = bankAccount.getPaymentDue();
break;
default:
amount = getAmountFromEditText(binding.etnuevaCantidad);
return amount;
private double getAmountFromEditText(EditText editText)
try
String text = editText.getText().toString();
return Double.parseDouble(text);
catch (NumberFormatException e)
return -1.0;
private void bindBankDataToRadioButtons(BankAccount bankAccount)
binding.rbdeudaActual.setText(
getString(R.string.label_deudaActual, bankAccount.getCurrentDebt())
);
binding.rbsinInteres.setText(
getString(R.string.label_sinInteres, bankAccount.getMinimumPaymentDue())
);
binding.rbpagoMinimo.setText(
getString(R.string.label_pagoMinimo, bankAccount.getPaymentDue())
);
private void bindBankDataToViews(BankAccount bankAccount)
binding.cardLayout.tvAccountName.setText(bankAccount.getAccountName());
//El string label_peso_sign pide un número, por eso el método getString recibe
//un segundo parámetro, que en este caso es el accountBalance.
binding.cardLayout.tvAccountBalance.setText(getString(R.string.label_peso_sign, bankAccount.getAccountBalance()));
binding.cardLayout.tvAccountNumber.setText(bankAccount.getAccountNumber());
binding.cardLayout.tvCardName.setText(bankAccount.getCardName());
binding.cardLayout.tvCardNumber.setText(bankAccount.getCardNumber());
binding.cardLayout.tvCurrentDebtAmount.setText(getString(R.string.label_peso_sign, bankAccount.getCurrentDebt()));
binding.cardLayout.tvClosingDateBalanceAmount.setText(getString(R.string.label_peso_sign, bankAccount.getClosingDateBalance()));
binding.cardLayout.tvPaymentDate.setText(bankAccount.getPaymentDueDate());
private void showToastMessage(String message)
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
private SuccessPayment makePayment(double amount, BankAccount bankAccount)
String date = new SimpleDateFormat(
"dd 'de' MMMM 'de' yyyy",
new Locale("es", "MX")
).format(new Date(Calendar.getInstance().getTimeInMillis()));
String referenceNumber = UUID.randomUUID().toString().substring(0, 10);
// amount -> double
// date -> String
// referenceNumber -> String
// bankAccount -> BankAccount
return new SuccessPayment(
amount,
date,
referenceNumber,
bankAccount
);
这是我的 Activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="vertical">
<include
android:id="@+id/cardLayout"
layout="@layout/card_layout" />
<RadioGroup
android:layout_
android:layout_
android:id="@+id/rbGroup">
<RadioButton
android:id="@+id/rbdeudaActual"
android:layout_
android:layout_
android:layout_marginTop="10dp"
android:layout_marginStart="10dp"
android:text="@string/label_deudaActual" />
<RadioButton
android:id="@+id/rbpagoMinimo"
android:layout_
android:layout_
android:layout_marginTop="10dp"
android:layout_marginStart="10dp"
android:text="@string/label_pagoMinimo" />
<RadioButton
android:id="@+id/rbsinInteres"
android:layout_
android:layout_
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:text="@string/label_sinInteres" />
<RadioButton
android:id="@+id/rbotraCantidad"
android:layout_
android:layout_
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:text="@string/label_otraCantidad" />
<TextView
android:layout_
android:layout_
android:textColor="@color/black"
android:layout_marginTop="10dp"
android:layout_marginStart="5dp"
android:text="@string/label_nuevaCantidad"
android:id="@+id/ingreseCantidad"/>
<EditText
android:id="@+id/etnuevaCantidad"
android:layout_marginStart="5dp"
android:layout_
android:layout_
android:inputType="number"
android:imeOptions="actionDone">
</EditText>
</RadioGroup>
<Space
android:id="@+id/espacio"
android:layout_
android:layout_
android:layout_weight="1" />
<Button
android:id="@+id/bnpagar"
android:layout_
android:layout_
android:text="@string/label_pagar" />
</LinearLayout>
这是我的成功Activity.java：
package com.example.bankapp.ui;
import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.example.bankapp.R;
import com.example.bankapp.databinding.ActivitySuccessBinding;
import com.example.bankapp.domain.SuccessPayment;
public class SuccessActivity extends AppCompatActivity
private ActivitySuccessBinding binding;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
binding = ActivitySuccessBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_success);
SuccessPayment payment = getIntent().getParcelableExtra("SUCCESS_EXTRA");
这是我的 ActivitySuccess.xml ：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:orientation="vertical">
<ImageView
android:id="@+id/imageView2"
android:layout_
android:layout_
android:contentDescription="@string/label_current_debt"
tools:srcCompat="@tools:sample/avatars" />
</LinearLayout>
这是我的 Android 清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.bankapp">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.BankApp">
<activity android:name=".ui.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ui.SuccessActivity" > </activity>
</application>
</manifest>
【问题讨论】：
您检查过您的 logcat 是否有任何错误？ 【参考方案1】：首先我不知道你为什么使用这种方法来膨胀布局，而不是仅仅使用 setContentview 方法并将活动作为上下文添加到相应的 xml 中。
第二次尝试在你的 onCreate 方法中保持对 super.onCreate 的调用
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
binding = ActivitySuccessBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
setContentView(R.layout.activity_success);
SuccessPayment payment = getIntent().getParcelableExtra("SUCCESS_EXTRA");
【讨论】：
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