＆QUOT;犯已经称为QUOT;错误在Android的碎片addToBackStack [英] "commit already called" error in android addToBackStack for fragment

问题描述

我创造了一个家庭的活动，其中包括一个导航抽屉的onclick与片段。我已经包括 fragmentTransaction.addToBackStack（空）.commit（）; 的片段交易code回去previous页面。

我要的要求是 NavigationDrawer - ＆GT;片段1 - ＆GT; Fragment2 - ＆GT;在后退按钮preSS - ＆GT;片段1（上后退按钮pressed） - 方式＆gt; MainActivity

不过，现在我只能移动到片段1 ，但不能移动到 Fragment2 。
它显示了一个错误 java.lang.IllegalStateException：已提交名为

在我的MainActivity

  @燮pressWarnings（StatementWithEmptyBody）
@覆盖
公共布尔onNavigationItemSelected（菜单项项）{
    FragmentManager fragmentManager = getSupportFragmentManager（）;
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction（）;
    //处理导航视图项点击这里。
    INT ID = item.getItemId（）;
    RelativeLayout的mainLayout =（RelativeLayout的）findViewById（R.id.mainlayout）;  如果（ID == R.id.nav_project）{
        ProjectFragment片段=新ProjectFragment（）;
        mainLayout.removeAllViews（）;
        fragmentTransaction.add（R.id.mainlayout，片段）;
        fragmentTransaction.addToBackStack（空）.commit（）;    }    DrawerLayout抽屉=（DrawerLayout）findViewById（R.id.drawer_layout）;
    drawer.closeDrawer（GravityCompat.START）;
    返回true;
}
 @覆盖
    公共无效onBack pressed（）{
        DrawerLayout抽屉=（DrawerLayout）findViewById（R.id.drawer_layout）;
        如果（drawer.isDrawerOpen（GravityCompat.START））{
            drawer.closeDrawer（GravityCompat.START）;
        }其他{
            super.onBack pressed（）;
        }
    }
 

我的第一块碎片

 进口android.os.Bundle;
进口android.support.annotation.Nullable;
进口android.support.v4.app.Fragment;
进口android.support.v4.app.FragmentManager;
进口android.support.v4.app.FragmentTransaction;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.Button;
进口android.widget.ImageView;
进口android.widget.RelativeLayout;
/ **
 *一个简单的{@link片段}子类。
 * /
公共类LoginFragment扩展片段{
    按钮登入，登录;
    ImageView的标志;    @Nullable
    @覆盖
    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{
        视图V = inflater.inflate（R.layout.fragment_login，集装箱，FALSE）;
        FragmentManager fragmentManager = getFragmentManager（）;
        最后FragmentTransaction fragmentTransaction =
                fragmentManager.beginTransaction（）;
        最终的RelativeLayout mainLayout =（RelativeLayout的）getActivity（）findViewById（R.id.mainlayout）。
        登入=（按钮）v.findViewById（R.id.button2）;        signin.setOnClickListener（新View.OnClickListener（）{
            @覆盖
            公共无效的onClick（视图v）{
                SignUpFragment片段=新SignUpFragment（）;
                mainLayout.removeAllViews（）;
                fragmentTransaction.add（R.id.mainlayout，片段）;
                fragmentTransaction.commit（）;
                fragmentTransaction.addToBackStack（空）.commit（）;
            }
        }）;
        登录=（按钮）v.findViewById（R.id.button）;
        login.setOnClickListener（新View.OnClickListener（）{
            @覆盖
            公共无效的onClick（视图v）{
                LoginEnterFragment片段=新LoginEnterFragment（）;
                mainLayout.removeAllViews（）;
                fragmentTransaction.add（R.id.mainlayout，片段）;
                fragmentTransaction.commit（）;
                fragmentTransaction.addToBackStack（空）.commit（）;
            }
        }）;
        LOGO =（ImageView的）v.findViewById（R.id.imageView）;        返回伏;
    }}
 

我的第三个片段

 进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.view.LayoutInflater;
进口android.view.View;
进口android.view.ViewGroup;/ **
 *一个简单的{@link片段}子类。
 * /
公共类LoginEnterFragment扩展片段{    公共LoginEnterFragment（）{
        //必需的空公共构造
    }
    @覆盖
    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
                             捆绑savedInstanceState）{
        //充气的布局该片段
        返回inflater.inflate（R.layout.fragment_login_enter，集装箱，FALSE）;
    }
}
 

我的logcat

  11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：致命异常：主要
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：工艺：com.example.rubin，PID：676
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：java.lang.IllegalStateException：提交已经叫
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.support.v4.app.BackStackRecord.commitInternal（BackStackRecord.java:621）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.support.v4.app.BackStackRecord.commit（BackStackRecord.java:613）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在com.example.root5solutions.mirrealtors.LoginFragment $ 2.onClick（LoginFragment.java:53）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.view.View.performClick（View.java:4780）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.view.View $ PerformClick.run（View.java:19866）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.os.Handler.handleCallback（Handler.java:739）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.os.Handler.dispatchMessage（Handler.java:95）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.os.Looper.loop（Looper.java:135）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在android.app.ActivityThread.main（ActivityThread.java:5254）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在java.lang.reflect.Method.invoke（本机方法）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在java.lang.reflect.Method.invoke（Method.java:372）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:903）
11-01 23：44：17.237 676-676 / com.example.rubin E / AndroidRuntime：在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:698）
 

解决方案

  

IllegalStateException异常：已提交名为

由于调用提交（）方法二时间 LoginFragment 在登入和登录按钮点击：

  fragmentTransaction.commit（）;
fragmentTransaction.addToBackStack（空）.commit（）;
 

线引起的问题。

使用 addToBackStack 方法：

  fragmentTransaction.addToBackStack（空）.commit（）;
 

I had Created a Home activity which includes a Navigation Drawer onclick with fragment. I had included fragmentTransaction.addToBackStack(null).commit(); with the fragment transaction code to go back to previous page.

My Desired requirement was NavigationDrawer-->Fragment1-->Fragment2--> On BackButtonPress-->Fragment1(On BackButton Pressed)-->MainActivity.

But,Now i am only able to move to Fragment1,But cant move to Fragment2. It shows an error java.lang.IllegalStateException: commit already called

In My MainActivity

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    // Handle navigation view item clicks here.
    int id = item.getItemId();
    RelativeLayout mainLayout=(RelativeLayout)findViewById(R.id.mainlayout);

  if (id == R.id.nav_project) {
        ProjectFragment fragment = new ProjectFragment();
        mainLayout.removeAllViews();
        fragmentTransaction.add(R.id.mainlayout, fragment);
        fragmentTransaction.addToBackStack(null).commit();

    } 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}
 @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

My First Fragment

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;


/**
 * A simple {@link Fragment} subclass.
 */
public class LoginFragment extends Fragment {
    Button signin,login;
    ImageView logo;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_login,container,false);
        FragmentManager fragmentManager = getFragmentManager();
        final FragmentTransaction fragmentTransaction =
                fragmentManager.beginTransaction();
        final RelativeLayout mainLayout=(RelativeLayout)getActivity().findViewById(R.id.mainlayout);
        signin=(Button)v.findViewById(R.id.button2);

        signin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                SignUpFragment fragment = new SignUpFragment();
                mainLayout.removeAllViews();
                fragmentTransaction.add(R.id.mainlayout, fragment);
                fragmentTransaction.commit();
                fragmentTransaction.addToBackStack(null).commit();
            }
        });
        login=(Button)v.findViewById(R.id.button);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                LoginEnterFragment fragment = new LoginEnterFragment();
                mainLayout.removeAllViews();
                fragmentTransaction.add(R.id.mainlayout, fragment);
                fragmentTransaction.commit();
                fragmentTransaction.addToBackStack(null).commit();
            }
        });
        logo=(ImageView)v.findViewById(R.id.imageView);

        return v;
    }

}

My third Fragment

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;



/**
 * A simple {@link Fragment} subclass.
 */
public class LoginEnterFragment extends Fragment {

    public LoginEnterFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_login_enter, container, false);
    }


}

My Logcat

11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime: FATAL EXCEPTION: main
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime: Process: com.example.rubin, PID: 676
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime: java.lang.IllegalStateException: commit already called
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:621)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:613)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at com.example.root5solutions.mirrealtors.LoginFragment$2.onClick(LoginFragment.java:53)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.view.View.performClick(View.java:4780)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:19866)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:135)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5254)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
11-01 23:44:17.237 676-676/com.example.rubin E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

解决方案

IllegalStateException: commit already called

Because calling commit() method two time in LoginFragment Fragment on signin and login Button click :

fragmentTransaction.commit();
fragmentTransaction.addToBackStack(null).commit();

lines causing issue.

Use addToBackStack method as:

fragmentTransaction.addToBackStack(null).commit();

这篇关于＆QUOT;犯已经称为QUOT;错误在Android的碎片addToBackStack的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！