我尝试通过按下按钮将片段替换为另一个片段。
按钮的代码是：
nextB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(client_fizic_existentCB.isChecked())
{
Fragment fragment2 = new ComandaClientFizicExistentFragment();
FragmentTransaction transaction = getActivity().getFragmentManager().beginTransaction();
transaction.replace(R.id.frame_container, fragment2);
transaction.commit();
}
}
});
代码不起作用。当我按下第一个片段中的按钮时，应用程序会崩溃。
有人知道为什么吗？
logcat的：
04-13 12:46:30.902: W/dalvikvm(986): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
04-13 12:46:30.914: E/AndroidRuntime(986): FATAL EXCEPTION: main
04-13 12:46:30.914: E/AndroidRuntime(986): java.lang.NullPointerException
04-13 12:46:30.914: E/AndroidRuntime(986): at info.androidhive.slidingmenu.ComandaClientFizicExistentFragment.onCreateView(ComandaClientF izicExistentFragment.java:47)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.app.BackStackRecord.run(BackStackRecord.java:635)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.os.Handler.handleCallback(Handler.java:615)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.os.Handler.dispatchMessage(Handler.java:92)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.os.Looper.loop(Looper.java:137)
04-13 12:46:30.914: E/AndroidRuntime(986): at android.app.ActivityThread.main(ActivityThread.java:4745)
04-13 12:46:30.914: E/AndroidRuntime(986): at java.lang.reflect.Method.invokeNative(Native Method)
04-13 12:46:30.914: E/AndroidRuntime(986): at java.lang.reflect.Method.invoke(Method.java:511)
04-13 12:46:30.914: E/AndroidRuntime(986): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
04-13 12:46:30.914: E/AndroidRuntime(986): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-13 12:46:30.914: E/AndroidRuntime(986): at dalvik.system.NativeStart.main(Native Method)
第一个片段，ComandaNouaFragment：
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CheckBox;
public class ComandaNouaFragment extends Fragment {
public CheckBox client_fizic_nouCB;
//public CheckBox client_fizic_existentCB;
public CheckBox client_juridic_nouCB;
public CheckBox client_juridic_existentCB;
public Button nextB;
public Intent i=null;
public ComandaNouaFragment(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_comanda_noua1, container, false);
client_fizic_nouCB=(CheckBox)rootView.findViewById(R.id.client_fizic_nouCB);
final CheckBox client_fizic_existentCB=(CheckBox)rootView.findViewById(R.id.client_fizic_existentCB);
client_juridic_nouCB=(CheckBox)rootView.findViewById(R.id.client_juridic_nouCB);
client_juridic_existentCB=(CheckBox)rootView.findViewById(R.id.client_juridic_existentCB);
nextB=(Button)rootView.findViewById(R.id.nextB);
nextB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(client_fizic_nouCB.isChecked())
{}
else
if(client_fizic_existentCB.isChecked())
{
Fragment fragment2 = new ComandaClientFizicExistentFragment();
FragmentTransaction transaction = getFragmentManager()
.beginTransaction();
transaction.replace(R.id.frame_container, fragment2)
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.addToBackStack(null).commit();
}
else
if(client_juridic_nouCB.isChecked())
{}
else
if(client_juridic_existentCB.isChecked())
{ }
}
});
return rootView;
}
}
第二个片段，ComandaClientFizicExistentFragment：
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
public class ComandaClientFizicExistentFragment extends Fragment{
public Button selecteazaB;
public EditText cautareClientET;
public RadioButton dupaNumeRB;
public RadioButton dupaCnpRB;
private String numeClient="";
private String cnpClient="";
private Intent i=null;
public ComandaClientFizicExistentFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_select_client_fizic_existent, container, false);
selecteazaB=(Button)rootView.findViewById(R.id.selecteazaB);
cautareClientET=(EditText)rootView.findViewById(R.id.cautareClientTV);
dupaNumeRB=(RadioButton)rootView.findViewById(R.id.dupaNumeRB);
dupaCnpRB=(RadioButton)rootView.findViewById(R.id.dupaCnpRB);
if(dupaNumeRB.isChecked())
numeClient=cautareClientET.getText().toString();
else
cnpClient=cautareClientET.getText().toString();
selecteazaB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//MainActivity ma= new MainActivity();
//ma.trecere();
//final FragmentTransaction ft = getFragmentManager().beginTransaction();
//ft.replace(R.id.details, new ComandaNouaAlegereProduseFragment, "NewFragmentTag");
//ft.commit();
//i = new Intent(getActivity(), ComandaNouaAlegereProduseFragment.class);
//startActivity(i);
Fragment fragment3 = new ComandaNouaAlegereProduseFragment();
FragmentTransaction transaction = getActivity().getFragmentManager().beginTransaction();
transaction.replace(R.id.frame_container, fragment3);
transaction.commit();
}
});