Android 如何从片段中获取getArguments数据?
我正在为我的应用程序使用一个片段。我也在片段中添加了一个bundle,但是当我想从bundle中获取添加的字符串时,编译器会显示一个空指针错误,如下所示Android 如何从片段中获取getArguments数据?,android,android-fragments,android-bundle,Android,Android Fragments,Android Bundle,我正在为我的应用程序使用一个片段。我也在片段中添加了一个bundle,但是当我想从bundle中获取添加的字符串时,编译器会显示一个空指针错误,如下所示 Process: com.softmaker.gazi_opu.personalhealthcare, PID: 3253 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toStrin
Process: com.softmaker.gazi_opu.personalhealthcare, PID: 3253
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference
at com.softmaker.gazi_opu.personalhealthcare.fragment.GeneralInformationFragment.setValue(GeneralInformationFragment.java:67)
at com.softmaker.gazi_opu.personalhealthcare.fragment.GeneralInformationFragment.onCreateView(GeneralInformationFragment.java:59)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:458)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
下面给出了我添加的代码和获取添加的数据代码
public static GeneralInformationFragment getInstance(String profileID){
Bundle bundle = new Bundle();
bundle.putString("profileId",profileID);
GeneralInformationFragment generalFragment = new GeneralInformationFragment();
generalFragment.setArguments(bundle);
return generalFragment;
}
现在从onCreateMethod中的这个片段获取数据
String id = getArguments().getString("profileId");
Log.e("ID :", "" + id.toString());
有人能推荐我吗。我哪里出错了?在转换为字符串之前,请始终检查null
String id = getArguments().getString("profileId");
if(id!=null){
Log.e("ID :", "" + id.toString());
}
我总是这样传递数据,并且工作得非常完美:
public class CategoryResultFragment extends BaseListFragment {
private static final String CATEGORY_ID = "EXTRA_CATEGORY_ID";
private static final String CATEGORY_SLUG = "EXTRA_CATEGORY_SLUG";
private String mCategoryId;
private String mCategorySlug;
public static CategoryResultFragment newInstance(String categoryId, String categorySlug) {
Bundle bundle = new Bundle();
bundle.putString(CATEGORY_ID, categoryId);
bundle.putString(CATEGORY_SLUG, categorySlug);
CategoryResultFragment categoryResultFragment = new CategoryResultFragment();
categoryResultFragment.setArguments(bundle);
return categoryResultFragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (getArguments() != null) {
mCategoryId = getArguments().getString(CATEGORY_ID);
mCategorySlug = getArguments().getString(CATEGORY_SLUG);
}
return super.onCreateView(inflater, container, savedInstanceState);
}
}
检查profileID值,它可能为nullcheck getArguments()=在onCreateView中为null您的代码看起来很好,正如您在我的回答中所看到的,建议对静态方法使用“final\u statics\u String”。是的,兄弟,我检查profileID值它为null。。。这就是我面临问题的原因。这不只是为了检查问题吗!!!!亲爱的,我只是想知道。我是否正确添加了捆绑字符串。如果正确,那么为什么会出现此错误。如果不是的话,那是什么错误…输入“id”的字符串必须为空,并且您正试图对其执行字符串操作。假设,我只使用id,那么??是的,我认为这是一个好方法。。。但是如果我想从另一个活动调用这个片段,比如CategoryResultFragment(getIntent().getStringExtra(“CATEGRY_ID”),getIntent.getStringExtra(“CATEGORY_SLUG”);那么CATEGORY\u ID和CATEGORY\u SLUG将返回什么值??或者我如何将值作为参数传递到这个片段中