java – Android将ArrayList从Activity传递给Fragment
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内容图文
嗨,我想发送数据ArrayList< Division>到Fragment类ListContentFragment.
在MainActivity中,我正在进行网络调用以获取数据(JSON)然后解析它以创建ArrayList< Division>,现在我想用我收到的数据填充列表视图(现在在ArrayList< Division>中)
主要活动
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Adding Toolbar to Main screen
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Setting ViewPager for each Tabs
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
// Set Tabs inside Toolbar
TabLayout tabs = (TabLayout) findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
// Create Navigation drawer and inlfate layout
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
// Adding menu icon to Toolbar
ActionBar supportActionBar = getSupportActionBar();
if (supportActionBar != null) {
VectorDrawableCompat indicator
= VectorDrawableCompat.create(getResources(), R.drawable.ic_menu, getTheme());
indicator.setTint(ResourcesCompat.getColor(getResources(),R.color.white,getTheme()));
supportActionBar.setHomeAsUpIndicator(indicator);
supportActionBar.setDisplayHomeAsUpEnabled(true);
}
// Set behavior of Navigation drawer
navigationView.setNavigationItemSelectedListener(
new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
// Set item in checked state
menuItem.setChecked(true);
// TODO: handle navigation
Toast.makeText(MainActivity.this, "Clicked: " + menuItem.getTitle(), Toast.LENGTH_SHORT).show();
// Closing drawer on item click
mDrawerLayout.closeDrawers();
return true;
}
});
// Adding Floating Action Button to bottom right of main view
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Hello Snackbar!",
Snackbar.LENGTH_LONG).show();
}
});
// Network request test with volley
NetworkRequests networkRequest = new NetworkRequests(this);
networkRequest.fetchDummyData();
divisionList = networkRequest.getDivisions();
}
// Add Fragments to Tabs
private void setupViewPager(ViewPager viewPager) {
Adapter adapter = new Adapter(getSupportFragmentManager());
adapter.addFragment(new ListContentFragment(), "List");
adapter.addFragment(new TileContentFragment(), "Tile");
adapter.addFragment(new CardContentFragment(), "Card");
viewPager.setAdapter(adapter);
}
片段(目前其硬编码,想要填充ArrayList)
public class ListContentFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
RecyclerView recyclerView = (RecyclerView) inflater.inflate(
R.layout.recycler_view, container, false);
ContentAdapter adapter = new ContentAdapter(recyclerView.getContext());
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return recyclerView;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView avator;
public TextView name;
public TextView description;
public ViewHolder(LayoutInflater inflater, ViewGroup parent) {
super(inflater.inflate(R.layout.item_list, parent, false));
avator = (ImageView) itemView.findViewById(R.id.list_avatar);
name = (TextView) itemView.findViewById(R.id.list_title);
description = (TextView) itemView.findViewById(R.id.list_desc);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context = v.getContext();
Intent intent = new Intent(context, DetailActivity.class);
intent.putExtra(DetailActivity.EXTRA_POSITION, getAdapterPosition());
context.startActivity(intent);
}
});
}
}
/**
* Adapter to display recycler view.
*/
public static class ContentAdapter extends RecyclerView.Adapter<ViewHolder> {
// Set numbers of List in RecyclerView.
private static final int LENGTH = 18;
private final String[] mPlaces;
private final String[] mPlaceDesc;
private final Drawable[] mPlaceAvators;
public ContentAdapter(Context context) {
Resources resources = context.getResources();
mPlaces = resources.getStringArray(R.array.places);
mPlaceDesc = resources.getStringArray(R.array.place_desc);
TypedArray a = resources.obtainTypedArray(R.array.place_avator);
mPlaceAvators = new Drawable[a.length()];
for (int i = 0; i < mPlaceAvators.length; i++) {
mPlaceAvators[i] = a.getDrawable(i);
}
a.recycle();
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(parent.getContext()), parent);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.avator.setImageDrawable(mPlaceAvators[position % mPlaceAvators.length]);
holder.name.setText(mPlaces[position % mPlaces.length]);
holder.description.setText(mPlaceDesc[position % mPlaceDesc.length]);
}
@Override
public int getItemCount() {
return LENGTH;
}
}
}
解决方法:
如果要将ArrayList传递给片段,则需要确保Model类实现了Parcelable.
在这里我可以展示一个例子.
public class ObjectName implements Parcelable {
public ObjectName(Parcel in) {
super();
readFromParcel(in);
}
public static final Parcelable.Creator<ObjectName> CREATOR = new Parcelable.Creator<ObjectName>() {
public ObjectName createFromParcel(Parcel in) {
return new ObjectName(in);
}
public ObjectName[] newArray(int size) {
return new ObjectName[size];
}
};
public void readFromParcel(Parcel in) {
Value1 = in.readInt();
Value2 = in.readInt();
Value3 = in.readInt();
}
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(Value1);
dest.writeInt(Value2);
dest.writeInt(Value3);
}
}
然后你可以添加ArrayList< ObjectName>到Bundle对象.
ArrayList<ObjectName> arraylist = new Arraylist<ObjectName>();
Bundle bundle = new Bundle();
bundle.putParcelableArrayList("arraylist", arraylist);
fragment.setArguments(bundle);
在此之后,您可以使用以下方式获取此数据：
Bundle extras = getIntent().getExtras();
ArrayList<ObjectName> arraylist = extras.getParcelableArrayList("arraylist");
最后,您可以在片段中显示包含这些数据的列表.希望这有助于得到您期望的答案.
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