android–Button在Fragment中单击以打开新片段

概述我不知道如何在按钮点击上打开一个新片段,我只知道如何使用intent打开新的Activity但是当我尝试打开新片段时我的项目应用程序崩溃希望有人可以帮助我解决我的问题这就是我所拥有的：importandroid.app.Fragment;importandroid.os.Bundle;importandroid.app.FragmentManager;

我不知道如何在按钮点击上打开一个新片段,我只知道如何使用intent打开新的Activity但是当我尝试打开新片段时我的项目应用程序崩溃希望有人可以帮助我解决我的问题

这就是我所拥有的：

import androID.app.Fragment;import androID.os.Bundle;import androID.app.FragmentManager;import androID.app.FragmentTransaction;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.vIEw.VIEwGroup;import androID.Widget.ArrayAdapter;import androID.Widget.button;import androID.Widget.Spinner;public class FragmentTwo extends Fragment {public FragmentTwo() {}@OverrIDepublic VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container,        Bundle savedInstanceState) {    VIEw vIEw = inflater.inflate(R.layout.fragment_layout_two, container,            false);    // SPINNER1    Spinner spinner1 = (Spinner) vIEw.findVIEwByID(R.ID.spinnerSpecialty);    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromresource(            getActivity(), R.array.specialty_arrays,            androID.R.layout.simple_spinner_item);    adapter.setDropDownVIEwResource(androID.R.layout.simple_spinner_dropdown_item);    spinner1.setAdapter(adapter);    // SPINNER2    Spinner spinner2 = (Spinner) vIEw.findVIEwByID(R.ID.spinnerLocation);    ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromresource(            getActivity(), R.array.city_array,            androID.R.layout.simple_spinner_item);    adapter2.setDropDownVIEwResource(androID.R.layout.simple_spinner_dropdown_item);    spinner2.setAdapter(adapter);    // button    button btnSearch = (button) vIEw.findVIEwByID(R.ID.btnSearch);    btnSearch.setonClickListener(new VIEw.OnClickListener() {         @OverrIDe            public voID onClick(VIEw v) {                switch (v.getID()) {                case R.ID.btnSearch:                    //what to put here                   FragmentManager fm = getFragmentManager();                   FragmentTransaction ft = fm.beginTransaction();                   ft.replace(R.ID.content_frame, new FragmentThree());                    ft.commit();                 break;                }            }       });       return vIEw;}

}

logcat的：

04-01 03:45:25.508: E/AndroIDRuntime(1618): FATAL EXCEPTION: main04-01 03:45:25.508: E/AndroIDRuntime(1618): java.lang.NullPointerException04-01 03:45:25.508: E/AndroIDRuntime(1618):     at          com.droID.FragmentThree.onCreateVIEw(FragmentThree.java:30)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at  androID.app.Fragment.performCreateVIEw(Fragment.java:1695)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.app.FragmentManagerImpl.movetoState(FragmentManager.java:885)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at   androID.app.FragmentManagerImpl.movetoState(FragmentManager.java:1057)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.app.BackStackRecord.run(BackStackRecord.java:682)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.app.FragmentManagerImpl.run(FragmentManager.java:441)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.os.Handler.handleCallback(Handler.java:730)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.os.Handler.dispatchMessage(Handler.java:92)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.os.Looper.loop(Looper.java:137)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at androID.app.ActivityThread.main(ActivityThread.java:5103)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at java.lang.reflect.Method.invokeNative(Native Method)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at java.lang.reflect.Method.invoke(Method.java:525)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:553)04-01 03:45:25.508: E/AndroIDRuntime(1618):     at dalvik.system.NativeStart.main(Native Method)

解决方法:

试试这个：

从下面代码更改ID show_fragment以匹配您的布局XML ID ..

 @OverrIDe            public voID onClick(VIEw v) {                switch (v.getID()) {                case R.ID.btnSearch:                    //what to put here                   FragmentManager fm = getFragmentManager();                   FragmentTransaction ft = fm.beginTransaction();                   ft.replace(R.ID.show_fragment, new TestFragment(), "fragment_screen");                    ft.commit();                 break;                }            }   <FrameLayout        androID:ID="@+ID/show_fragment"        androID:layout_wIDth="match_parent"        androID:layout_height="0dp">    </FrameLayout>

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