Java 在我的代码中,getArgument每次都返回null
我已经尝试了每种类型的解决方案,但是片段get参数方法总是返回null 这是我的片段代码Java 在我的代码中,getArgument每次都返回null,java,android,android-studio,Java,Android,Android Studio,我已经尝试了每种类型的解决方案,但是片段get参数方法总是返回null 这是我的片段代码 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View view = inflate
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_main_activity, container, false);
**String data1 = getArguments().getString("data");
Toast.makeText(getActivity(), getArgument1, Toast.LENGTH_SHORT).show();**
}
在上面的代码中,data1总是返回null。
这是我的主要活动代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
chipNavigationBar = findViewById(R.id.bottomNavBar);
chipNavigationBar.setItemSelected(R.id.home, true);
getSupportFragmentManager().beginTransaction().replace(R.id.container1, new mainActivityFragment()).commit();
chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
@Override
public void onItemSelected(int i) {
Fragment fragment = null;
switch (i) {
case R.id.home:
**fragment = new mainActivityFragment();
Bundle bundle = new Bundle();
bundle.putString("data","anything");
fragment.setArguments(bundle);**
break;
case R.id.menu:
fragment = new menuFragment();
break;
case R.id.corona:
fragment = new CoronaFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.container1, fragment).commit();
}
});
}
我担心有两个地方可以加载
mainActivityFragment()
——第一个是默认情况下,当没有bundle参数时,第二个是当芯片导航栏时。调用setOnItemSelectedListener
。也许可以试试这样:
static mainActivityFragment createMainActivityFragment() {
mainActivityFragment fragment = new mainActivityFragment();
Bundle bundle = new Bundle();
bundle.putString("data","anything");
fragment.setArguments(bundle);
return fragment;
}
//IN ONCREATE:
getSupportFragmentManager().beginTransaction().replace(R.id.container1, mainActivityFragment.createMainActivityFragment()).commit();
//IN THE SWITCH
case R.id.home:
fragment = mainActivityFragment.createMainActivityFragment()
break;
那么这两个实例都应该有bundle是
data1
还是getArgument1
相同的东西?是否调用了chipNavigationBar.setOnItemSelectedListener
呢?是的data1和getArgument1都是相同的,是的chipNavigationBar被调用了。如果我的java有错误,我已经习惯了Kotlinno担心,如果它真的有效,你能把它标记为答案吗?