[英]Fragment already added
I have 3 Fragments, and 3 buttons, when i click on a button, it changes fragment, but when i click on a item on a fragment list, it opens up a new fragment. 我有3个片段和3个按钮,当我单击一个按钮时,它会更改片段,但是当我单击片段列表中的一个项目时,它将打开一个新片段。
public class MainActivity extends FragmentActivity implements ContactFragment.OnContactClickedListener{
private CalendarFragment calendarFragment;
private CommunicationFragment communicationFragment;
private ContactFragment contactFragment;
private SingleContactFragment singleContactFragment;
//
private FragmentManager manager;
//
private Button btn_calendar, btn_contact, btn_communication;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bind();
initFragments();
manager = getSupportFragmentManager();
manager.beginTransaction()
.add(R.id.fl_main_container, calendarFragment).commit();
}
private void bind() {
btn_calendar = (Button) findViewById(R.id.btn_main_calendar);
btn_communication = (Button) findViewById(R.id.btn_main_communication);
btn_contact = (Button) findViewById(R.id.btn_main_contact);
btn_calendar.setOnClickListener(listener);
btn_communication.setOnClickListener(listener);
btn_contact.setOnClickListener(listener);
}
private void initFragments() {
calendarFragment = new CalendarFragment();
communicationFragment = new CommunicationFragment();
contactFragment = new ContactFragment();
singleContactFragment = new SingleContactFragment();
}
private void changeFragment(Fragment f) {
manager.beginTransaction().replace(R.id.fl_main_container, f).commit();
manager.executePendingTransactions();
}
private void displayContact(ContactObject contact){
manager.beginTransaction().replace(R.id.fl_main_container, singleContactFragment).addToBackStack(null).commit();
manager.executePendingTransactions();
}
private OnClickListener listener = new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn_main_calendar:
changeFragment(calendarFragment);
break;
case R.id.btn_main_communication:
changeFragment(communicationFragment);
break;
case R.id.btn_main_contact:
changeFragment(contactFragment);
break;
}
}
};
@Override
public void onClick(ContactObject contact) {
// TODO Auto-generated method stub
displayContact(contact);
}
}
When i click on Contact, i choose a contact, and i click on contact again and then i start to tap on my back button, a "IllegalStateException ; Fragment already added : ContactFragment" is thrown. 当我单击“联系人”时,我选择一个联系人,然后再次单击“联系人”,然后开始点击我的“后退”按钮,将引发“ IllegalStateException;已添加的片段:ContactFragment”。 And i don't see why. 而且我不明白为什么。
Here's the logcat : 这是logcat:
07-02 13:32:31.046: E/AndroidRuntime(11412): FATAL EXCEPTION: main
07-02 13:32:31.046: E/AndroidRuntime(11412): java.lang.IllegalStateException: Fragment already added: ContactFragment{420b6a40 #0 id=0x7f060000}
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1192)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:646)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:482)
07-02 13:32:31.046: E/AndroidRuntime(11412): at com.big5media.ercoiffure.MainActivity.changeFragment(MainActivity.java:57)
07-02 13:32:31.046: E/AndroidRuntime(11412): at com.big5media.ercoiffure.MainActivity.access$1(MainActivity.java:55)
07-02 13:32:31.046: E/AndroidRuntime(11412): at com.big5media.ercoiffure.MainActivity$1.onClick(MainActivity.java:79)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.view.View.performClick(View.java:4240)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.view.View$PerformClick.run(View.java:17721)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.os.Handler.handleCallback(Handler.java:730)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.os.Handler.dispatchMessage(Handler.java:92)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.os.Looper.loop(Looper.java:137)
07-02 13:32:31.046: E/AndroidRuntime(11412): at android.app.ActivityThread.main(ActivityThread.java:5103)
07-02 13:32:31.046: E/AndroidRuntime(11412): at java.lang.reflect.Method.invokeNative(Native Method)
07-02 13:32:31.046: E/AndroidRuntime(11412): at java.lang.reflect.Method.invoke(Method.java:525)
07-02 13:32:31.046: E/AndroidRuntime(11412): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
07-02 13:32:31.046: E/AndroidRuntime(11412): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-02 13:32:31.046: E/AndroidRuntime(11412): at dalvik.system.NativeStart.main(Native Method)
如果不需要导航,请在您的changeFragment方法上尝试添加addToBackStack(null)...否则,最好删除片段并再次添加。
manager.beginTransaction().replace(R.id.fl_main_container, f).addToBackStack(null).commit();
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