[英]How to navigate between fragments?
我是Android Fragments的新手。 我有2個不同的片段,並希望使用按鈕從一個片段導航到另一個片段。 例如,在fragmentA中,當我按下一個按鈕時,我轉到fragmentB並進行了比較。
這是我的簡單代碼:
FragmentA.java
public class FragmentA extends Fragment {
public FragmentA(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_a, container, false);
return rootView;
}
}
fragmenta.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="670dp"
android:gravity="top"
android:orientation="vertical" >
<TextView
android:id="@+id/txtLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="15dp"
android:text="Fragment 1"
android:textStyle="bold"
android:textSize="22dp" />
</LinearLayout>
FragmentB.java
public class FragmentB extends Fragment {
public FragmentB(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_b, container, false);
return rootView;
}
}
fragment.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="670dp"
android:gravity="top"
android:orientation="vertical" >
<TextView
android:id="@+id/txtLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="15dp"
android:text="Fragment 2"
android:textStyle="bold"
android:textSize="22dp" />
</LinearLayout>
我需要按鈕的代碼(java和xml)。 從頭開始的幫助將不勝感激。 提前致謝!!
查看本教程和下面的代碼以獲得參考
Fragment1.java
public class Fragment1 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment1, container, false);
}
public void onClick(View view) {
Fragment2 fragment2 = new Fragment2();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment1, fragment2);
fragmentTransaction.commit();
}
}
Fragment2.java
public class Fragment2 extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment2, container, false);
}
}
活動中的代碼
public class MyActivity extends FragmentActivity implements OnListenerChangeFragment {
FragmentA mFragmentA;
FragmentB mFragmentB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
// transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
@Override
public void onShowFragmenA() {
//replace mFragmentB by mFragmentA
}
@Override
public void onShowFragmenB() {
//replace mFragmentA by mFragmentA
}
}
//片段代碼
public class FragmentA extends Fragment {
private OnListenerChangeFragment mCallback;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
Button mButton = new Button(getActivity());
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mCallback.onShowFragmenB();
}
});
return mButton;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (OnListenerChangeFragment) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()+ " must implement OnListenerChangeFragment");
}
}
}
public class FragmentB extends Fragment {
private OnListenerChangeFragment mCallback;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Button mButton = new Button(getActivity());
mButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mCallback.onShowFragmenA();
}
});
return mButton;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (OnListenerChangeFragment) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()+ " must implement OnListenerChangeFragment");
}
}
}
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