[英]Passing a data from Activity to Tabbed Layout Fragment?
我有两个活动。 第一个是包含列表视图的普通活动,第二个是带有两个选项卡的选项卡式布局。 一个是“描述”选项卡,另一个是“样本代码”选项卡。
我为每个创建了两个单独的片段,即“ OneFragment”和“ TwoFragment”。 我需要做的就是,当用户单击我正常活动中的某个项目时,该项目将存储在字符串中,并且该字符串应传递到选项卡式布局,并应显示在OneFragment中,即“说明”选项卡
(例)。 我的列表包含{“ Android”,“ Studio”}如果用户单击Android,则此文本应传递到说明标签,并使用TextView显示该文本。 请帮我。 在这里,我包括我各自的代码。
NormalActivity-> ListActi.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
lv = (ListView) findViewById(R.id.listView);
final List<String> ListElementsArrayList = new ArrayList<String>(Arrays.asList(listElements));
final ArrayAdapter<String> adapter = new ArrayAdapter<String>
(getApplicationContext(), android.R.layout.simple_list_item_1, ListElementsArrayList);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Toast.makeText(getApplicationContext(), listElements[position],Toast.LENGTH_LONG).show();
s = listElements[position];
if(position == 1){
s = listElements[position];
Bundle bundle = new Bundle();
bundle.putString("ClickedItem", listElements[position]);
OneFragment fragobj = new OneFragment();
TwoFragment fag = new TwoFragment();
fragobj.setArguments(bundle);
fag.setArguments(bundle);
Intent i = new Intent(getApplicationContext(),BothLay.class);
startActivity(i);
}
}
});
}
}
TabActivity-> BothLay
public class BothLay extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_both_lay);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new OneFragment(), "Description");
adapter.addFragment(new TwoFragment(), "Sample Code");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount(){
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
解密选项卡-> OneFragment (我所需要的只是将数据从“正常活动”传递到此Fragment)
public class OneFragment extends Fragment{
String strtext = "Ajay";
public OneFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.fragment_one, container, false);
TextView textView = (TextView) rootview.findViewById(R.id.t1);
//strtext = getIntent().getStringExtra("ClickedItem"); //this doesn't work
textView.setText(strtext);
return rootview;
}
}
样本代码选项卡-> Twofragment
public class TwoFragment extends Fragment{
public TwoFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_two, container, false);
}
}
这里:
fragobj.setArguments(bundle);
fag.setArguments(bundle);
单击按钮不起作用,因为当前正在启动BothLay
Activity,而不是将Fragment添加到FragmentManager
。
要使其正常工作:
1.单击按钮时,将使用Intent的包传递给BothLay
Acivity:
Intent i = new Intent(getApplicationContext(),BothLay.class);
i.putExtras(bundle);
startActivity(i);
2.从BothLay
Activity的onCreate
的Intent中获取Bundle,然后在调用adapter.addFragment
方法时将其传递给Fragment的:
Bundle bundle = getIntent().getExtras();
tabLayout.setupWithViewPager(viewPager,bundle);
将捆绑包传递给Fragment对象:
private void setupViewPager(ViewPager viewPager,Bundle bundle) {
...
Fragment fragmentOne=new OneFragment();
fragmentOne.setArguments(bundle);
adapter.addFragment(fragmentOne, "Description");
// do same for second Framgment
}
编辑:
要在Fragment中获取数据,请在Fragment的onCreateView
中调用getArguments
方法:
Bundle bundle=getArguments();
if(bundle!=null){
if(bundle.containsKey("ClickedItem")){
String strClickedItem=bundle.getString("ClickedItem");
}
}
做我提供链接的所有步骤。
恢复片段后,需要执行第四步。
下面的代码将出现在您的活动中,
SelectedBundle selectedBundle;
最后,您将在selectedBundle上获得fragment的实例。
因此,您可以轻松地将值传递给片段。 喜欢,
fragment.setData(String passedData);
就这样。
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