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- Changing main thread db queries to be executed in a room observer way

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This commit is contained in:
Javier Varona 2018-10-10 21:57:40 -04:00
parent 303011e419
commit 62edb37143
2 changed files with 67 additions and 49 deletions
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3
app/src/main/java/cy/agorise/crystalwallet/dao/CryptoCurrencyDao.java
View file

@ -23,6 +23,9 @@ public interface CryptoCurrencyDao {
@Query("SELECT * FROM crypto_currency WHERE id = :id") @Query("SELECT * FROM crypto_currency WHERE id = :id")
CryptoCurrency getById(long id); CryptoCurrency getById(long id);
@Query("SELECT * FROM crypto_currency WHERE id = :id")
LiveData<CryptoCurrency> getLDById(long id);
@Query("SELECT * FROM crypto_currency WHERE name = :name AND crypto_net = :cryptoNet") @Query("SELECT * FROM crypto_currency WHERE name = :name AND crypto_net = :cryptoNet")
CryptoCurrency getByNameAndCryptoNet(String name,String cryptoNet); CryptoCurrency getByNameAndCryptoNet(String name,String cryptoNet);

113
app/src/main/java/cy/agorise/crystalwallet/views/CryptoCoinBalanceViewHolder.java
View file

@ -69,66 +69,81 @@ public class CryptoCoinBalanceViewHolder extends RecyclerView.ViewHolder {
this.clear(); this.clear();
} else { } else {
//Retrieves the preferred currency selected by the user //Retrieves the preferred currency selected by the user
LiveData<GeneralSetting> preferedCurrencySetting = CrystalDatabase.getAppDatabase(this.context).generalSettingDao().getByName(GeneralSetting.SETTING_NAME_PREFERRED_CURRENCY); final LiveData<GeneralSetting> preferedCurrencySetting = CrystalDatabase.getAppDatabase(this.context).generalSettingDao().getByName(GeneralSetting.SETTING_NAME_PREFERRED_CURRENCY);
//Retrieves the currency of this balance //Retrieves the currency of this balance
final CryptoCurrency currencyFrom = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getById(balance.getCryptoCurrencyId()); //final CryptoCurrency currencyFrom = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getById(balance.getCryptoCurrencyId());
//Sets the name and amount of the balance in the view LiveData<CryptoCurrency> currencyFromLD = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getLDById(balance.getCryptoCurrencyId());
String balanceString = String.format("%.2f",balance.getBalance()/Math.pow(10,currencyFrom.getPrecision()));
cryptoCoinName.setText(currencyFrom.getName());
cryptoCoinBalance.setText(balanceString);
//Observes the preferred currency of the user. If the user changes it, this will change the equivalent value
preferedCurrencySetting.observe((LifecycleOwner) this.context, new Observer<GeneralSetting>() { currencyFromLD.observe((LifecycleOwner) this.context, new Observer<CryptoCurrency>() {
@Override @Override
public void onChanged(@Nullable GeneralSetting generalSetting) { public void onChanged(@Nullable final CryptoCurrency currencyFrom) {
if (generalSetting != null) { //Sets the name and amount of the balance in the view
//Gets the currency object of the preferred currency String balanceString = String.format("%.2f",balance.getBalance()/Math.pow(10,currencyFrom.getPrecision()));
LiveData<CryptoCurrency> currencyToLiveData = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getLiveDataByName(generalSetting.getValue()); cryptoCoinName.setText(currencyFrom.getName());
cryptoCoinBalance.setText(balanceString);
currencyToLiveData.observe((LifecycleOwner) context, new Observer<CryptoCurrency>() { //Observes the preferred currency of the user. If the user changes it, this will change the equivalent value
@Override preferedCurrencySetting.observe((LifecycleOwner) context, new Observer<GeneralSetting>() {
public void onChanged(@Nullable CryptoCurrency cryptoCurrency) { @Override
if (cryptoCurrency != null) { public void onChanged(@Nullable GeneralSetting generalSetting) {
CryptoCurrency currencyTo = cryptoCurrency; if (generalSetting != null) {
//Gets the currency object of the preferred currency
LiveData<CryptoCurrency> currencyToLiveData = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getLiveDataByName(generalSetting.getValue());
//Retrieves the equivalent value of this balance using the "From" currency and the "To" currency currencyToLiveData.observe((LifecycleOwner) context, new Observer<CryptoCurrency>() {
LiveData<CryptoCurrencyEquivalence> currencyEquivalenceLiveData = CrystalDatabase.getAppDatabase(context) @Override
.cryptoCurrencyEquivalenceDao().getByFromTo( public void onChanged(@Nullable CryptoCurrency cryptoCurrency) {
currencyTo.getId(), if (cryptoCurrency != null) {
currencyFrom.getId() CryptoCurrency currencyTo = cryptoCurrency;
); //Retrieves the equivalent value of this balance using the "From" currency and the "To" currency
LiveData<CryptoCurrencyEquivalence> currencyEquivalenceLiveData = CrystalDatabase.getAppDatabase(context)
.cryptoCurrencyEquivalenceDao().getByFromTo(
currencyTo.getId(),
currencyFrom.getId()
//Observes the equivalent value. If the equivalent value changes, this will keep the value showed correct
currencyEquivalenceLiveData.observe((LifecycleOwner) context, new Observer<CryptoCurrencyEquivalence>() {
@Override
public void onChanged(@Nullable CryptoCurrencyEquivalence cryptoCurrencyEquivalence) {
if (cryptoCurrencyEquivalence != null) {
CryptoCurrency toCurrency = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getById(cryptoCurrencyEquivalence.getFromCurrencyId());
double equivalentValue = 0;
String equivalenceString = "";
if (cryptoCurrencyEquivalence.getValue() > 0) {
equivalentValue = (balance.getBalance() / Math.pow(10, currencyFrom.getPrecision())) /
(cryptoCurrencyEquivalence.getValue() / Math.pow(10, toCurrency.getPrecision()));
equivalenceString = String.format(
"%.2f",
equivalentValue
); );
} else {
equivalentValue = 0;
equivalenceString = "0";
}
cryptoNetBalanceViewHolder.setEquivalentBalance(balance,equivalentValue); //Observes the equivalent value. If the equivalent value changes, this will keep the value showed correct
cryptoCoinBalanceEquivalence.setText( currencyEquivalenceLiveData.observe((LifecycleOwner) context, new Observer<CryptoCurrencyEquivalence>() {
equivalenceString + " " + toCurrency.getName()); @Override
} public void onChanged(final @Nullable CryptoCurrencyEquivalence cryptoCurrencyEquivalence) {
if (cryptoCurrencyEquivalence != null) {
LiveData<CryptoCurrency> toCurrencyLD = CrystalDatabase.getAppDatabase(context).cryptoCurrencyDao().getLDById(cryptoCurrencyEquivalence.getFromCurrencyId());
toCurrencyLD.observe((LifecycleOwner) context, new Observer<CryptoCurrency>() {
@Override
public void onChanged(@Nullable CryptoCurrency toCurrency) {
double equivalentValue = 0;
String equivalenceString = "";
if (cryptoCurrencyEquivalence.getValue() > 0) {
equivalentValue = (balance.getBalance() / Math.pow(10, currencyFrom.getPrecision())) /
(cryptoCurrencyEquivalence.getValue() / Math.pow(10, toCurrency.getPrecision()));
equivalenceString = String.format(
"%.2f",
equivalentValue
);
} else {
equivalentValue = 0;
equivalenceString = "0";
}
cryptoNetBalanceViewHolder.setEquivalentBalance(balance,equivalentValue);
cryptoCoinBalanceEquivalence.setText(
equivalenceString + " " + toCurrency.getName());
}
});
}
}
});
} }
}); }
} });
} }
}); }
} });
} }
}); });
} }