从activity中进行跳转失败，在网上看了很多都没有弄好

[m0_46615472]

没有bug 在logcat看到有一个地方错误 at com.example.myapplication.LoginActivity.onCreate(LoginActivity.java:38) 对应的地方 getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, fristFragment).show(fristFragment).commit(); 整个的源码 package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentTransaction; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.LinearLayout; import android.widget.TextView; import fragment.FouthFragment; import fragment.FristFragment; import fragment.SecondFragment; import fragment.ThirdFragment; public class LoginActivity extends AppCompatActivity implements View.OnClickListener { private Fragment[] mfragments; private FristFragment fristFragment; private SecondFragment secondFragment; private ThirdFragment thirdFragment; private FouthFragment fouthFragment; private int index; private int currentTabIndex; private static final int FRAGMENT_frist= 0; private static final int FRAGMENT_second= 1; private static final int FRAGMENT_third = 2; private static final int FRAGMENT_fouth = 3; private LinearLayout[] mTabs; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); mfragments=new Fragment[]{fristFragment,secondFragment,thirdFragment,fouthFragment}; getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, fristFragment).show(fristFragment).commit(); mTabs = new LinearLayout[mfragments.length]; mTabs[FRAGMENT_frist]=findViewById(R.id.fragment_frist); mTabs[FRAGMENT_second]=findViewById(R.id.fragment_second); mTabs[FRAGMENT_third]=findViewById(R.id.fragment_third); mTabs[FRAGMENT_fouth]=findViewById(R.id.fragment_fouth); mTabs[FRAGMENT_frist].setOnClickListener(this); mTabs[FRAGMENT_second].setOnClickListener(this); mTabs[FRAGMENT_third].setOnClickListener(this); mTabs[FRAGMENT_fouth].setOnClickListener(this); mTabs[FRAGMENT_frist].setSelected(true); } @Override public void onClick(View v) 能知道是哪里错误的帮我看一下吧 谢谢

[m0_46615472]

引用 1 楼 Xia_焱的回复:

你改一下呢
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.fragment_container, fristFragment);
transaction.commitAllowingStateLoss();

//这段去掉呢
show(fristFragment)
最好让我看一下你xml 代码

我按照你写的改了 还是不行 at com.example.myapplication10.Main.onCreate(Main.java:44) transaction.replace(R.id.fragment_frist,fristFragment);

[m0_46615472]

引用 1 楼 Xia_焱的回复:

你改一下呢
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.fragment_container, fristFragment);
transaction.commitAllowingStateLoss();

//这段去掉呢
show(fristFragment)
最好让我看一下你xml 代码

我就是在mainactivity弄了一个button 想实现点击这个button进入主界面

[Xia_燚]

你改一下呢
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction transaction = fm.beginTransaction();
transaction.replace(R.id.fragment_container, fristFragment);
transaction.commitAllowingStateLoss();

//这段去掉呢
show(fristFragment)
最好让我看一下你xml 代码

[王能]

错误语是啥？日志说明也很重要，不要只发一行

[JMSissi]

如果你是要Fragment跳转啥的com.github.1079374315:GT:v1.1.3 用这个依赖

[简单吗]

是报空了吧，没有初始化