我嘗試將字符串從活動傳遞到片段。如您所見，我正在使用if語句來防止應用程序崩潰。Toast 消息始終顯示“捆綁空”。如何防止聯邦為空？活動：public class SettingsActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getSupportFragmentManager().beginTransaction() .replace(android.R.id.content, new SetttingsFragment()) .commit(); Bundle bundle = new Bundle(); bundleSettings.putString("my_bundle_key", "Bundle"); SetttingsFragment setttingsFragment = new SetttingsFragment(); setttingsFragment.setArguments(bundle);片段：public class SetttingsFragment extends PreferenceFragmentCompat {@Overridepublic void onCreatePreferences(Bundle bundle, String rootKey) { setPreferencesFromResource(R.xml.preferences, rootKey); Bundle bundle = getArguments(); if(bundle != null){ String bundleString = bundle.getString("my_bundle_key"); Log.i("my_bundle_key", bundleString); } else{ Toast.makeText(getActivity(), "Bundle null", Toast.LENGTH_LONG).show(); }
5 回答
呼啦一陣風
TA貢獻1802條經驗 獲得超6個贊
在代碼中，您將捆綁包設置為未使用的片段變量
創建捆綁包
創建片段
在片段中設置捆綁包
顯示片段
這是您需要以片段形式傳遞參數的方式
public class SettingsActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SettingsFragment settingsFragment = new SettingsFragment();
if (savedInstanceState == null) {
Bundle bundle = new Bundle();
bundle.putString("my_bundle_key", "Bundle");
settingsFragment.setArguments(bundle);
}
else {
settingsFragment.setArguments(savedInstanceState);
}
getSupportFragmentManager().beginTransaction()
.replace(android.R.id.content, settingsFragment)
.commit();
收到一只叮咚
TA貢獻1821條經驗 獲得超5個贊
在調用之前，您必須調用捆綁包，如下所示：fragment
Bundle bundle = new Bundle();
bundleSettings.putString("my_bundle_key", "Bundle");
SetttingsFragment setttingsFragment = new SetttingsFragment();
setttingsFragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction()
.replace(android.R.id.content, setttingsFragment)
.commit();
Cats萌萌
TA貢獻1805條經驗 獲得超9個贊
在您的活動中，您正在創建兩個片段對象，您正在執行的第二個對象未附加到視圖且未在使用中。您的片段應按如下方式附加到視圖：setargument
Bundle bundle = new Bundle();
bundleSettings.putString("my_bundle_key", "Bundle");
SetttingsFragment setttingsFragment = new SetttingsFragment();
setttingsFragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction()
.replace(android.R.id.content, setttingsFragment)
.commit();
一只萌萌小番薯
TA貢獻1795條經驗 獲得超7個贊
From Activity you send data with intent as:
Bundle bundle = new Bundle();
bundle.putString("edttext", "From Activity");
Fragmentclass obj = new Fragmentclass();
obj .setArguments(bundle);
在片段創建視圖方法中：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String strtext = getArguments().getString("edttext");
return inflater.inflate(R.layout.fragment, container, false);
}
慕雪6442864
TA貢獻1812條經驗 獲得超5個贊
活動
AbcFragment fragment = AbcFragment .newInstance(**Value**);
getSupportFragmentManager.beginTransaction()
.replace(R.id.layout_container, fragment)
.commit();
在片段中
public static AbcFragment newInstance(String Value) {
Bundle args = new Bundle();
args.putString("Value", Value);
AbcFragment fragment = new AbcFragment ();
fragment.setArguments(args);
return fragment;
}
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