当然我在get行中有nullPointerException。 我知道有人说：你好sqlite更好，但我试着理解领域lib和服务如何合作。
这是我的代码： 主：
public class MainActivity extends AppCompatActivity {
List<String> shopsNames;
ArrayList<RowModel> rowModels;
protected RealmService mService;
protected boolean mBound = false;
public Realm mRealm;
@BindView(R.id.toolbar_layout)
CollapsingToolbarLayout toolbarLayout;
@BindView(R.id.app_bar)
AppBarLayout appBar;
private ShopsAdapter adapter;
@BindView(R.id.recycler_view)
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
ButterKnife.bind(this);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ConnectionDetector connectionDetector = new ConnectionDetector(this);
if (!connectionDetector.isConnection()){
finish();
}
rowModels = new ArrayList<>();
shopsNames = new ArrayList<>();
mRealm = Realm.getInstance(this);
initCollapsingToolbar();
adapter = new ShopsAdapter(MainActivity.this, shopsNames);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getApplicationContext(), 2);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapter);
Intent intent = new Intent(getApplicationContext(), RealmService.class);
bindService(intent, mConnection, this.BIND_AUTO_CREATE);
AsyncTaskRetro asyncTaskRetro = new AsyncTaskRetro();
asyncTaskRetro.execute();
}
private class AsyncTaskRetro extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... voids) {
PlacesAPI.Factory.getInstance().getPlaces().enqueue(new Callback<Places>() {
@Override
public void onResponse(Call<Places> call, Response<Places> response) {
for (int i = 0; i < response.body().getPosts().size(); i++) {
RowModel rowModel = new RowModel(response.body().getPosts().get(i).getNazwa(),
Double.parseDouble(response.body().getPosts().get(i).getSzer()),
Double.parseDouble(response.body().getPosts().get(i).getDlug()));
rowModels.add(rowModel);
}
String oldName;
oldName = rowModels.get(0).getName();
shopsNames.add(rowModels.get(0).getName());
mRealm.beginTransaction();
RowModel rowModelRealm = mRealm.createObject(RowModel.class);
mRealm.commitTransaction();
for (int j = 0; j < rowModels.size(); j++) {
mRealm.beginTransaction();
rowModelRealm.setName(rowModels.get(j).getName());
rowModelRealm.setLattitude(rowModels.get(j).getLattitude());
rowModelRealm.setLongitude(rowModels.get(j).getLongitude());
mRealm.commitTransaction();
if (rowModels.get(j).getName().equals(oldName)) {
continue;
}
oldName = rowModels.get(j).getName();
shopsNames.add(rowModels.get(j).getName());
}
mService.setRealm(mRealm);
RealmResults<RowModel> rw = mRealm.where(RowModel.class).findAll();
Log.d("sdfsd", Integer.toString(rw.size()));
//sortowanie listy z nazwami sklepow
Collections.sort(shopsNames);
adapter = new ShopsAdapter(MainActivity.this, shopsNames);
recyclerView.setAdapter(adapter);
try {
Glide.with(getApplicationContext()).load("http://www.wp.pl/shop-local-logo.png").
into((ImageView) findViewById(R.id.backdrop));
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onFailure(Call<Places> call, Throwable t) {
}
});
return null;
}
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
RealmService.LocalBinder binder = (RealmService.LocalBinder) service;
mService = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
private void initCollapsingToolbar() {
final CollapsingToolbarLayout collapsingToolbar =
(CollapsingToolbarLayout) findViewById(R.id.toolbar_layout);
collapsingToolbar.setTitle(" ");
AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.app_bar);
appBarLayout.setExpanded(true);
// hiding & showing the title when toolbar expanded & collapsed
appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
boolean isShow = false;
int scrollRange = -1;
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
if (scrollRange == -1) {
scrollRange = appBarLayout.getTotalScrollRange();
}
if (scrollRange + verticalOffset == 0) {
collapsingToolbar.setTitle(getString(R.string.app_name));
isShow = true;
} else if (isShow) {
collapsingToolbar.setTitle(" ");
isShow = false;
}
}
});
}
}
我的第二堂课：
public class Test extends AppCompatActivity {
protected RealmService mService;
protected boolean mBound = false;
public Realm mRealm;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
Intent intent = new Intent(this, RealmService.class);
bindService(intent, mConnection, this.BIND_AUTO_CREATE);
mRealm = mService.getRealm();
mRealm.beginTransaction();
RealmResults<RowModel> rowModels = mRealm.where(RowModel.class).findAll();
if(!rowModels.isEmpty()){
String s;
for (int i = 0; i < rowModels.size(); i++) {
s = rowModels.get(i).getName() + " " + rowModels.get(i).getLattitude()
+ " " + rowModels.get(i).getLongitude();
Log.d("S: ", s);
}
}
}
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
RealmService.LocalBinder binder = (RealmService.LocalBinder) service;
mService = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
}
和服务：
public class RealmService extends Service {
public Realm getRealm() {
return realm;
}
public void setRealm(Realm realm) {
this.realm = realm;
}
public Realm realm;
private final IBinder iBinder = new LocalBinder();
@Nullable
@Override
public IBinder onBind(Intent intent) {
return iBinder;
}
public class LocalBinder extends Binder {
RealmService getService() {
return RealmService.this;
}
}
}