bundle.getString返回空字符串
bundle.getString返回空字符串
提问于 2019-05-12 19:01:05
我不能理解在将参数从一个活动传递到一个片段时我哪里错了。
在MyActivity.class中
Bundle bundle = new Bundle();
bundle.putString("name", "helloworld");
HomeFragment homefragment = new HomeFragment();
homefragment.setArguments(bundle);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, homefragment).commit();在我的代码片段中，我尝试以这种方式在onCreateView方法中获取参数，但字符串始终为空
onCreateView()
Bundle bundle = this.getArguments();
if(bundle != null)
mName = bundle.getString("name"); //mName here is null, checked with a simple print
//this is for the viewpager
models = new ArrayList<>();
Resources res = getResources();
mDescriptions = res.getStringArray(R.array.newGameDescription);
mTitle = res.getStringArray(R.array.newGame);
models.add(new Model(R.drawable.brochure,mTitle[0], mDescriptions[0]));
models.add(new Model(R.drawable.sticker,mTitle[1], mDescriptions[1]));
models.add(new Model(R.drawable.poster,mTitle[2], mDescriptions[2]));
models.add(new Model(R.drawable.namecard,mTitle[3], mDescriptions[3]));
adapter = new ViewPagerAdapter(getContext(), models, mName); // I pass the string value here to pass it to an activity (with putextra) after clicking on a page of the viewer
View view = inflater.inflate(R.layout.fragment_home,container,false);
viewPager = (ViewPager) view.findViewById(R.id.gameModeViewPager);
viewPager.setAdapter(adapter);
viewPager.setPadding(130,0,130,0);
Integer[] colors_temp = {
getResources().getColor(R.color.prova1),
getResources().getColor(R.color.prova2),
getResources().getColor(R.color.prova3),
getResources().getColor(R.color.prova4),
};
colors = colors_temp;
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) {
if (i < (adapter.getCount() - 1) && i < (colors.length -1)){
viewPager.setBackgroundColor((Integer)argbEvaluator.evaluate(v, colors[i], colors[i+1]));
}else{
viewPager.setBackgroundColor(colors[colors.length -1]);
}
}
@Override
public void onPageSelected(int i) {
}
@Override
public void onPageScrollStateChanged(int i) {
}
});
return view;在注释中被询问后添加的代码，我不会以任何方式操作字符串
回答 2
Stack Overflow用户
发布于 2019-05-12 19:10:09
从你的活动中
Bundle b = new Bundle();
b.putString("name", "123456789");
FragmentA fragmentA = new FragmentA ();
fragmentA .setArguments(b);
fm.beginTransaction()
.replace(R.id.fragment_container, new FragmentA())
.commit();这个在碎片里。
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String text = getArguments().getString("name");
return inflater.inflate(R.layout.fragment, container, false);
}Stack Overflow用户
发布于 2019-05-12 19:17:30
而不是
Bundle bundle = getArguments();使用这个
Bundle bundle = this.getArguments();页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56098554
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