Java tutorial
/* Copyright(c) 2016 kobaken0029 All Rights Reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package click.kobaken.rxirohaandroid_sample.presenter; import android.content.ClipData; import android.content.ClipDescription; import android.content.ClipboardManager; import android.content.Context; import android.graphics.Bitmap; import android.os.Handler; import android.support.annotation.NonNull; import android.support.v4.widget.SwipeRefreshLayout; import android.text.Editable; import android.text.TextWatcher; import android.util.Log; import android.view.View; import android.widget.Toast; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.google.zxing.WriterException; import java.io.IOException; import java.security.InvalidKeyException; import java.security.KeyStoreException; import java.security.NoSuchAlgorithmException; import java.security.UnrecoverableKeyException; import javax.crypto.NoSuchPaddingException; import click.kobaken.rxirohaandroid.Iroha; import click.kobaken.rxirohaandroid.model.Account; import click.kobaken.rxirohaandroid.model.KeyPair; import click.kobaken.rxirohaandroid_sample.R; import click.kobaken.rxirohaandroid_sample.exception.ErrorMessageFactory; import click.kobaken.rxirohaandroid_sample.model.TransferQRParameter; import click.kobaken.rxirohaandroid_sample.util.QRCodeGenerator; import click.kobaken.rxirohaandroid_sample.view.AssetReceiveView; import io.reactivex.android.schedulers.AndroidSchedulers; import io.reactivex.disposables.CompositeDisposable; import io.reactivex.disposables.Disposable; import io.reactivex.observers.DisposableObserver; import io.reactivex.schedulers.Schedulers; import static android.content.Context.CLIPBOARD_SERVICE; public class AssetReceivePresenter implements Presenter<AssetReceiveView> { public static final String TAG = AssetReceivePresenter.class.getSimpleName(); private final Gson gson = new GsonBuilder().disableHtmlEscaping().create(); private AssetReceiveView assetReceiveView; private CompositeDisposable compositeDisposable; private Handler refreshHandler; private Runnable transactionRunnable; private String uuid; private String publicKey; private Bitmap qr; @Override public void setView(@NonNull AssetReceiveView view) { assetReceiveView = view; } @Override public void onCreate() { compositeDisposable = new CompositeDisposable(); } @Override public void onStart() { refreshHandler = new Handler(); transactionRunnable = this::fetchAccountAssetFromApi; generateQR(); fetchAccountAsset(); setPublicKey(); } @Override public void onResume() { // nothing } @Override public void onPause() { // nothing } @Override public void onStop() { // nothing } @Override public void onDestroy() { compositeDisposable.dispose(); } public void setUuid(String uuid) { this.uuid = uuid; } public SwipeRefreshLayout.OnRefreshListener onSwipeRefresh() { return () -> refreshHandler.postDelayed(transactionRunnable, 1500); } public View.OnClickListener onPublicKeyTextClicked() { return view -> { final String CLIP_DATA_LABEL_TEXT_DATA = "text_data"; final Context context = assetReceiveView.getContext(); ClipData.Item item = new ClipData.Item(assetReceiveView.getPublicKey()); String[] mimeType = new String[1]; mimeType[0] = ClipDescription.MIMETYPE_TEXT_URILIST; ClipData cd = new ClipData(new ClipDescription(CLIP_DATA_LABEL_TEXT_DATA, mimeType), item); ClipboardManager cm = (ClipboardManager) context.getSystemService(CLIPBOARD_SERVICE); cm.setPrimaryClip(cd); Toast.makeText(context, R.string.message_copy_to_clipboard, Toast.LENGTH_SHORT).show(); }; } public TextWatcher textWatcher() { return new TextWatcher() { private boolean isAmountEmpty; @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { String amount = assetReceiveView.getAmount(); isAmountEmpty = amount == null || amount.isEmpty(); } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { if (isAmountEmpty && charSequence.toString().equals("0")) { assetReceiveView.setAmount(""); return; } changeQR(); } @Override public void afterTextChanged(Editable editable) { // nothing } }; } private void fetchAccountAsset() { String assetValue = assetReceiveView.getHasAssetValue(); if (assetValue == null) { fetchAccountAssetFromApi(); } else { assetReceiveView.setHasAssetValue(assetValue); } } private void fetchAccountAssetFromApi() { if (uuid == null || uuid.isEmpty()) { uuid = getUuid(); } Disposable disposable = Iroha.getInstance().findAccount(uuid).observeOn(AndroidSchedulers.mainThread()) .subscribeOn(Schedulers.io()).subscribeWith(new DisposableObserver<Account>() { @Override public void onNext(Account result) { if (assetReceiveView.isRefreshing()) { assetReceiveView.setRefreshing(false); } if (result != null && result.assets != null && !result.assets.isEmpty()) { assetReceiveView.setHasAssetValue(result.assets.get(0).value); } } @Override public void onError(Throwable e) { if (assetReceiveView.isRefreshing()) { assetReceiveView.setRefreshing(false); } assetReceiveView.showError(ErrorMessageFactory.create(assetReceiveView.getContext(), e)); } @Override public void onComplete() { Log.d(TAG, "onComplete: "); } }); compositeDisposable.add(disposable); } private void setPublicKey() { assetReceiveView.setPublicKey(getPublicKey()); } private String getPublicKey() { if (publicKey == null || publicKey.isEmpty()) { final Context context = assetReceiveView.getContext(); try { publicKey = KeyPair.getKeyPair(context).publicKey; } catch (NoSuchPaddingException | UnrecoverableKeyException | NoSuchAlgorithmException | KeyStoreException | InvalidKeyException | IOException e) { Log.e(TAG, "getKeyPair: ", e); assetReceiveView.showError(ErrorMessageFactory.create(context, e)); return ""; } } return publicKey; } private String getUuid() { final Context context = assetReceiveView.getContext(); if (uuid == null || uuid.isEmpty()) { try { uuid = Account.getUuid(context); } catch (NoSuchPaddingException | UnrecoverableKeyException | NoSuchAlgorithmException | KeyStoreException | InvalidKeyException | IOException e) { assetReceiveView.showError(ErrorMessageFactory.create(context, e)); return ""; } } return uuid; } private void generateQR() { try { if (qr == null) { Log.d(TAG, "generateQR: new generation!"); qr = QRCodeGenerator.generateQR(generateQrParamsText(), 500, QRCodeGenerator.ENCODE_CHARACTER_TYPE_UTF_8); } setQR(qr); } catch (WriterException e) { assetReceiveView.showError(ErrorMessageFactory.create(assetReceiveView.getContext(), e)); } } private void changeQR() { try { qr = QRCodeGenerator.generateQR(generateQrParamsText(), 500, QRCodeGenerator.ENCODE_CHARACTER_TYPE_UTF_8); setQR(qr); } catch (WriterException e) { assetReceiveView.showError(ErrorMessageFactory.create(assetReceiveView.getContext(), e)); } } private void setQR(Bitmap qr) { assetReceiveView.setQR(qr); assetReceiveView.invalidate(); } private String generateQrParamsText() { final TransferQRParameter qrParams = new TransferQRParameter(); qrParams.account = getPublicKey(); qrParams.amount = getValueForReceiveAmount(); return gson.toJson(qrParams, TransferQRParameter.class); } private int getValueForReceiveAmount() { int value; try { value = Integer.parseInt(assetReceiveView.getAmount()); } catch (NumberFormatException e) { value = 0; } return value; } }