android - 按钮在 Fragment 内部单击以打开新的 Fragment

Question

我不知道如何在单击按钮时打开新 fragment ，我只知道如何使用 Intent 打开新 Activity 但是当我尝试打开新 fragment 时我的项目应用程序崩溃希望有人能帮助我解决我的问题

这是我的:

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;
}

洛卡特:

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)

Answer 1

试试这个:

从下面的代码更改 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>