错误提示：
Process: com.example.accountapp, PID: 3987
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app
Caused by: java.lang.IllegalStateException: commit already called
at androidx.fragment.app.BackStackRecord.commitInternal(BackStackRecord.java:315)
at androidx.fragment.app.BackStackRecord.commit(BackStackRecord.java:294)
这是一个Android应用程序中的严重错误，其中涉及到"java.lang.IllegalStateException"异常。具体来说，错误信息是"Could not execute method for android:onClick"，并且也提到了"commit already called"的问题。这种错误通常出现在Fragment的事务提交上，可能是由于重复调用了commit方法导致的。
原因：
在Android中，每个 FragmentTransaction 对象只能提交一次。一旦调用了 commit() 方法提交一个事务，该事务就被提交到活动的 FragmentManager 中，之后再次调用 commit() 方法会导致 "Can not perform this action after onSaveInstanceState" 异常或者 "commit already called" 异常。这是因为 commit() 方法已经被调用，再次调用会导致不可预测的行为。
原有代码：
package com.example.accountapp.pages;import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentContainerView;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;import android.os.Bundle;
import android.view.View;
import android.widget.TextView;import com.example.accountapp.R;
import com.example.accountapp.fragment.addaccount.AddExchangeFragment;
import com.example.accountapp.fragment.addaccount.AddInFragment;
import com.example.accountapp.fragment.addaccount.AddOutFragment;public class AddAccount extends AppCompatActivity {private int tabIndex = 1; //当前选中的tab页private TextView tab1,tab2,tab3,cancelTxt;private View divider1,divider2;private FragmentContainerView fragmentContainerView;private FragmentManager fragmentManager;private FragmentTransaction fragmentTransaction;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_add_account);initView();// 动态加载 FragmentFragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务fragmentTransaction.add(R.id.icon_frag,new AddOutFragment());fragmentTransaction.commit();}// 切换 tab页 点击方法public void tabChange(View view) {int index = view.getId();if(index == R.id.tab1){System.out.println("支出");divider1.setVisibility(View.INVISIBLE);divider2.setVisibility(View.VISIBLE);tab1.setBackgroundResource(R.drawable.selec_tab);tab3.setBackgroundResource(0);tab2.setBackgroundResource(0);fragmentTransaction.replace(R.id.icon_frag,new AddOutFragment());}else if(index == R.id.tab2){System.out.println("收入");divider1.setVisibility(View.INVISIBLE);divider2.setVisibility(View.INVISIBLE);tab2.setBackgroundResource(R.drawable.selec_tab);tab1.setBackgroundResource(0);tab3.setBackgroundResource(0);FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务fragmentTransaction.replace(R.id.icon_frag,new AddInFragment());}else{System.out.println("转账");divider1.setVisibility(View.VISIBLE);divider2.setVisibility(View.INVISIBLE);tab3.setBackgroundResource(R.drawable.selec_tab);tab1.setBackgroundResource(0);tab2.setBackgroundResource(0);fragmentTransaction.replace(R.id.icon_frag,new AddExchangeFragment());}fragmentTransaction.commit();}
}修改过后:
每次创建新的 FragmentTransaction 对象
package com.example.accountapp.pages;import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentContainerView;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;import android.os.Bundle;
import android.view.View;
import android.widget.TextView;import com.example.accountapp.R;
import com.example.accountapp.fragment.addaccount.AddExchangeFragment;
import com.example.accountapp.fragment.addaccount.AddInFragment;
import com.example.accountapp.fragment.addaccount.AddOutFragment;public class AddAccount extends AppCompatActivity {private int tabIndex = 1; //当前选中的tab页private TextView tab1,tab2,tab3,cancelTxt;private View divider1,divider2;private FragmentContainerView fragmentContainerView;private FragmentManager fragmentManager;private FragmentTransaction fragmentTransaction;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_add_account);initView();// 动态加载 FragmentFragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务fragmentTransaction.add(R.id.icon_frag,new AddOutFragment());fragmentTransaction.commit();}// 切换 tab页 点击方法public void tabChange(View view) {int index = view.getId();if(index == R.id.tab1){System.out.println("支出");divider1.setVisibility(View.INVISIBLE);divider2.setVisibility(View.VISIBLE);tab1.setBackgroundResource(R.drawable.selec_tab);tab3.setBackgroundResource(0);tab2.setBackgroundResource(0);FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务fragmentTransaction.replace(R.id.icon_frag,new AddOutFragment());fragmentTransaction.commit();}else if(index == R.id.tab2){System.out.println("收入");divider1.setVisibility(View.INVISIBLE);divider2.setVisibility(View.INVISIBLE);tab2.setBackgroundResource(R.drawable.selec_tab);tab1.setBackgroundResource(0);tab3.setBackgroundResource(0);FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务fragmentTransaction.replace(R.id.icon_frag,new AddInFragment());fragmentTransaction.commit();}else{System.out.println("转账");divider1.setVisibility(View.VISIBLE);divider2.setVisibility(View.INVISIBLE);tab3.setBackgroundResource(R.drawable.selec_tab);tab1.setBackgroundResource(0);tab2.setBackgroundResource(0);FragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();//开启事务fragmentTransaction.replace(R.id.icon_frag,new AddExchangeFragment());fragmentTransaction.commit();}}
}
