我的應(yīng)用程序很簡單，只是我有一個FragmentA和FragmentB第一個有一個按鈕通過第二個片段傳遞字符串數(shù)據(jù)（“嗨，我是 A”），第二個片段有一個文本來顯示此消息我的問題是為什么我的“ModifyTxt”方法不起作用？public class newFragmentA extends Fragment{ Button button; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.newfragmenta_layout,container,false); } newFragmentB newfragmentB; @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); button = getActivity().findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { newfragmentB.ModifyTxT("Hi I'm A"); } }); }}這是我的第二個 Fragment(FragmentB)public class newFragmentB extends Fragment { TextView textView; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.newfragmentb_layout,container,false); } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); textView = getActivity().findViewById(R.id.TV); } public void ModifyTxT(String string){ textView.setText(string); }}
2 回答
慕桂英4014372
TA貢獻1871條經(jīng)驗 獲得超13個贊
試試這個：
public class FragmentB extends Fragment {
// ...
public static FragmentB newInstance() {
return new FragmentB();
}
}
在片段A中：
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FragmentB newFragment = FragmentB.newInstance();
newFragment.modifyTxT("Hi I'm A");
}
});
注意編碼規(guī)則：類名首字母大寫，方法首字母小寫...
慕慕森
TA貢獻1856條經(jīng)驗 獲得超17個贊
更喜歡使用接口進行通信 Fragments
public class FragmentA extends Fragment{
public interface MyCallback{
void modifyTxT(String text); // method naming convention start with small letter.
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
button = getActivity().findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (newfragmentB instanceof MyCallback) {
((MyCallback)newfragmentB).modifyTxT("Hi I'm A");
}
}
});
}
}
public class FragmentB extends Fragment implements FragmentA.MyCallback{
public static FragmentB getInstance(){
return new FragmentB();
}
@Override
public void modifyTxT() {
}
}
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