我在选项卡式视图模式下的导航活动中有三个可滑动片段。每个片段都必须显示API中的JSON数据。问题是我无法获取片段中的数据..我使用recyclerView来查看数据。
这是我的片段：
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
import droidmentor.bnv_with_viewpager.MyAdapter;
import droidmentor.bnv_with_viewpager.Config;
import droidmentor.bnv_with_viewpager.R;
import droidmentor.bnv_with_viewpager.Products;
public class FindFragment extends Fragment implements SearchView.OnQueryTextListener {
/*private RecyclerView recyclerview;
private List<CountryModel> mCountryModel;
private RVAdapter adapter;*/
//Creating Views
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
private List<Products> productsList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_find, container, false);
/* recyclerview = (RecyclerView) view.findViewById(R.id.recyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerview.setLayoutManager(layoutManager);
//Initializing Views */
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
final ProgressDialog loading = new ProgressDialog(getActivity());
loading.setMessage("Loading Data");
loading.show();
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//Dismissing progress dialog
loading.dismiss();
// parseData(response);
JSONArray array = response;
for(int i = 0; i<array.length(); i++) {
Products products = new Products();
JSONObject json = null;
try {
json = array.getJSONObject(i);
products.setImageUrl(json.getString(Config.TAG_IMAGE_URL));
products.setNamee(json.getString(Config.TAG_NAME));
products.setRank(json.getInt(Config.TAG_RANK));
products.setRealName(json.getString(Config.TAG_REAL_NAME));
} catch (JSONException e) {
e.printStackTrace();
}
productsList.add(products);
}
//Finally initializing our adapter
adapter = new MyAdapter(productsList, getActivity());
//Adding adapter to recyclerview
recyclerView.setAdapter(adapter);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(jsonArrayRequest);
/* String[] locales = Locale.getISOCountries();
mCountryModel = new ArrayList<>();
for (String countryCode : locales) {
Locale obj = new Locale("", countryCode);
mCountryModel.add(new CountryModel(obj.getDisplayCountry(), obj.getISO3Country()));
}
adapter = new RVAdapter(mCountryModel);
recyclerview.setAdapter(adapter);*/
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
MenuItemCompat.setOnActionExpandListener(item,
new MenuItemCompat.OnActionExpandListener() {
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Do something when collapsed
// adapter.setFilter(mCountryModel);
return true; // Return true to collapse action view
}
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true; // Return true to expand action view
}
});
}
@Override
public boolean onQueryTextChange(String newText) {
// final List<CountryModel> filteredModelList = filter(mCountryModel, newText);
// adapter.setFilter(filteredModelList);
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
private List<CountryModel> filter(List<CountryModel> models, String query) {
query = query.toLowerCase();
final List<CountryModel> filteredModelList = new ArrayList<>();
for (CountryModel model : models) {
final String text = model.getName().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
return filteredModelList;
}
//This method will parse json data
private void parseData(JSONArray array){
for(int i = 0; i<array.length(); i++) {
Products products = new Products();
JSONObject json = null;
try {
json = array.getJSONObject(i);
products.setImageUrl(json.getString(Config.TAG_IMAGE_URL));
products.setNamee(json.getString(Config.TAG_NAME));
products.setRank(json.getInt(Config.TAG_RANK));
products.setRealName(json.getString(Config.TAG_REAL_NAME));
} catch (JSONException e) {
e.printStackTrace();
}
productsList.add(products);
}
//Finally initializing our adapter
adapter = new MyAdapter(productsList, getActivity());
//Adding adapter to recyclerview
recyclerView.setAdapter(adapter);
}
}
导航活动：
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.util.Log;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import droidmentor.bnv_with_viewpager.Fragment.FindFragment;
import droidmentor.bnv_with_viewpager.Fragment.AnalyseFragment;
import droidmentor.bnv_with_viewpager.Fragment.ContactsFragment;
public class Display extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
BottomNavigationView bottomNavigationView;
//This is our viewPager
private ViewPager viewPager;
//Fragments
AnalyseFragment analyseFragment;
FindFragment findFragment;
ContactsFragment contactsFragment;
MenuItem prevMenuItem;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
//Initializing viewPager
viewPager = (ViewPager) findViewById(R.id.viewpager);
//Initializing the bottomNavigationView
bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottom_navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(
new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.action_call:
viewPager.setCurrentItem(0);
break;
case R.id.action_chat:
viewPager.setCurrentItem(1);
break;
case R.id.action_contact:
viewPager.setCurrentItem(2);
break;
}
return false;
}
});
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
if (prevMenuItem != null) {
prevMenuItem.setChecked(false);
}
else
{
bottomNavigationView.getMenu().getItem(0).setChecked(false);
}
Log.d("page", "onPageSelected: "+position);
bottomNavigationView.getMenu().getItem(position).setChecked(true);
prevMenuItem = bottomNavigationView.getMenu().getItem(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
/* //Disable ViewPager Swipe
viewPager.setOnTouchListener(new View.OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
return true;
}
});
*/
setupViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
findFragment=new FindFragment();
analyseFragment=new AnalyseFragment();
contactsFragment=new ContactsFragment();
adapter.addFragment(findFragment);
adapter.addFragment(analyseFragment);
adapter.addFragment(contactsFragment);
viewPager.setAdapter(adapter);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.display, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
adapterVieawPage：
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
import java.util.ArrayList;
import java.util.List;
import droidmentor.bnv_with_viewpager.Fragment.AnalyseFragment;
import droidmentor.bnv_with_viewpager.Fragment.ContactsFragment;
import droidmentor.bnv_with_viewpager.Fragment.FindFragment;
/**
* Created by hamza on 23/4/17.
*/
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
// return mFragmentList.get(position);
switch (position) {
case 0:
FindFragment findFragment = new FindFragment();
return findFragment;
case 1:
AnalyseFragment analyseFragment = new AnalyseFragment();
return analyseFragment;
case 2:
ContactsFragment contactsFragment = new ContactsFragment();
return contactsFragment;
default:
return null;
}
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment) {
mFragmentList.add(fragment);
}
}
recyclerView适配器：
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* Created by hamza on 07/05/2017.
*/
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private ImageLoader imageLoader;
private Context context;
// private RequestQueue mRequestQueue;
// private ImageLoader mImageLoader;
private LayoutInflater inflater;
//List of products
List<Products> productsList;
public MyAdapter(List<Products> productsList, Context context){
super();
//Getting all the productsList
this.productsList = productsList;
inflater = LayoutInflater.from(context);
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.product_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v,context,productsList);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Products products = productsList.get(position);
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(products.getImageUrl(), ImageLoader.getImageListener(holder.imageView,
R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
/* mRequestQueue = Volley.newRequestQueue(context);
mImageLoader = new ImageLoader(mRequestQueue, new ImageLoader.ImageCache() {
private final LruCache<String, Bitmap> mCache = new LruCache<String, Bitmap>(10);
public void putBitmap(String url, Bitmap bitmap) {
mCache.put(url, bitmap);
}
public Bitmap getBitmap(String url) {
return mCache.get(url);
}
});*/
holder.imageView.setImageUrl(products.getImageUrl(), imageLoader);
//holder.imageView.setImageUrl(products.getImageUrl(), mImageLoader);
holder.textViewName.setText(products.getNamee());
holder.textViewRank.setText(String.valueOf(products.getRank()));
holder.textViewRealName.setText(products.getRealName());
}
@Override
public int getItemCount() {
if(productsList != null)
return productsList.size();
return 0;
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public NetworkImageView imageView;
public TextView textViewName;
public TextView textViewRank;
public TextView textViewRealName;
public List<Products> productsList = new ArrayList<Products>();
public Context context;
public ViewHolder(View itemView , Context context,List<Products> productsList ) {
super(itemView);
itemView.setOnClickListener(this);
this.productsList = productsList;
this.context = context;
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewName = (TextView) itemView.findViewById(R.id.textViewName);
textViewRank= (TextView) itemView.findViewById(R.id.textViewRank);
textViewRealName= (TextView) itemView.findViewById(R.id.textViewRealName);
}
@Override
public void onClick(View v) {
int position = getAdapterPosition();
Products productsList = this.productsList.get(position);
BitmapDrawable bd = (BitmapDrawable) ((NetworkImageView) v.findViewById(R.id.imageViewProduct))
.getDrawable();
Bitmap bitmap=bd.getBitmap();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bd.getBitmap().compress(Bitmap.CompressFormat.PNG, 100, baos);
byte[] imgByte = baos.toByteArray();
Intent intent = new Intent(this.context,start.class);
intent.putExtra("image",imgByte);
intent.putExtra("name",productsList.getNamee());
this.context.startActivity(intent);
}
}
}