android – Button在Fragment中单击以打开新片段

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() {

}

@Override
public 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: main
04-01 03:45:25.508: E/AndroidRuntime(1618): java.lang.NullPointerException
04-01 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$1.run(FragmentManager.java:441)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at android.os.Handler.handleCallback(Handler.java:730)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at android.os.Looper.loop(Looper.java:137)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at android.app.ActivityThread.main(ActivityThread.java:5103)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at java.lang.reflect.Method.invokeNative(Native Method)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at java.lang.reflect.Method.invoke(Method.java:525)
04-01 03:45:25.508: E/AndroidRuntime(1618):     at com.android.internal.os.ZygoteInit$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)

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>