通過捆綁包傳遞時在途中丟失數據，我得到嘗試在 String bundlePassData = this.getArguments（）.getString（“tagName”） 上的空對象引用上調用虛擬方法 'java.lang.String.String android.os.bundle.getString（java.lang.String）'這是我的代碼示例。主要活動-> tagsView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { Bundle bundle = new Bundle(); TextView textView = (TextView) view.findViewById(R.id.tagName); String selectedItemName = textView.getText().toString(); bundle.putString("tagName", selectedItemName); TaskAssignFragment taskAssignFragment = new TaskAssignFragment(); taskAssignFragment.setArguments(bundle); FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); transaction.commit(); getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new TaskAssignFragment()).addToBackStack(null).commit(); Log.i("ListView", selectedItemName); } });TaskAssignFragment->@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_task_assign, container, false); TextView test = view.findViewById(R.id.testerView); String bundlePassData = this.getArguments().getString("tagName"); test.setText(bundlePassData); return view;}我應該試試嗎？但是，如果我需要將數據作為變量，而不僅僅是在函數中，因為我會在.interfacesfragment
4 回答
守著星空守著你
TA貢獻1799條經驗 獲得超8個贊
在代碼中，替換時將創建新片段。
TaskAssignFragment taskAssignFragment = new TaskAssignFragment();
taskAssignFragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new TaskAssignFragment()).addToBackStack(null).commit();
使用已在其中設置參數的已創建的片段實例
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
taskAssignFragment).addToBackStack(null).commit();
茅侃侃
TA貢獻1842條經驗 獲得超22個贊
您正在創建新對象，同時替換片段。
TaskAssignFragment taskAssignFragment = new TaskAssignFragment();
taskAssignFragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
taskAssignFragment).addToBackStack(null).commit();
試試這個
慕工程0101907
TA貢獻1887條經驗 獲得超5個贊
tagsView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Bundle bundle = new Bundle();
TextView textView = (TextView) view.findViewById(R.id.tagName);
String selectedItemName = textView.getText().toString();
bundle.putString("tagName", selectedItemName);
TaskAssignFragment taskAssignFragment = new TaskAssignFragment();
taskAssignFragment.setArguments(bundle);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.commit();
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
taskAssignFragment).addToBackStack(null).commit();
Log.i("ListView", selectedItemName);
}
});
請嘗試此代碼，創建一個新的 TaskAssignFragment（） 實例，并在沒有參數的情況下傳遞它
慕村225694
TA貢獻1880條經驗 獲得超4個贊
您可以直接在片段上調用方法，例如：
TaskAssignFragment taskAssignFragment = new TaskAssignFragment();
// Call here your own method (from fragment)
taskAssignFragment.setSelectedItemName(selectedItemName);
在你的片段中：
public void setSelectedItemName(String selectedItemName) {
// Store data as field in class
this.selectedName = selectedItemName
}
其中 是類中的字段。selectedName
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