java - 从 Activity 中的按钮打开的 fragment

Question

MainActivity.java

btn_search.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentOne fragment = new FragmentOne();
                fragmentTransaction.add(R.id.layoutFragmentContainer, fragment);
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.commit();
            }
        });

...

FragmentOne.java

public class FragmentOne extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater,  ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.list,container,false);
    }
}

当我单击搜索按钮时，会出现 fragment ，但是当我再次单击它时，应用程序崩溃了。有人可以帮忙吗，我是 Android 新手，无法解决这个问题。

....日志:

 Process: com.example.user1.volleyballmanager, PID: 26892
                                                                                     java.lang.IllegalStateException: commit already called
                                                                                         at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:625)
                                                                                         at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:617)
                                                                                         at com.example.user1.volleyballmanager.MainActivity$2.onClick(MainActivity.java:52)--- 
line 52 : fragmentTransaction.commit();
                                                                                         at android.view.View.performClick(View.java:5156)
                                                                                         at android.view.View$PerformClick.run(View.java:20755)
                                                                                         at android.os.Handler.handleCallback(Handler.java:739)
                                                                                         at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                         at android.os.Looper.loop(Looper.java:145)
                                                                                         at android.app.ActivityThread.main(ActivityThread.java:5832)
                                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                                         at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
                                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)

Answer 1

将此方法放入您的主要 Activity 中

//FRAGMENT BACK STACK
public void getFragmentWithTag(Fragment fragment, String tag) {
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.addToBackStack(null);
    transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
    transaction.replace(R.id.activityFrame, fragment, tag).commit();
}

您可以像这样从 fragment 中调用它..

activity.getFragmentWithTag(Fragment, FragmentTag)