沒有簽名者授權交易

當試圖boundContract通過. 我錯過了獲取簽名者的方法。我只看到了簽名者的介面，但沒有辦法得到它的實現。geth-api@karalabeaar

java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
   Caused by: java.lang.reflect.InvocationTargetException
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
   Caused by: java.lang.Exception: no signer to authorize the transaction with
       at go.Seq.throwException(Seq.java:52)
       at org.ethereum.geth.BoundContract.transfer(Native Method)
       at org.ligi.ewallet.MainActivity$onCreate$function$1.invoke(MainActivity.kt:68)
       at org.ligi.ewallet.MainActivity$onCreate$function$1.invoke(MainActivity.kt:27)
       at org.ligi.ewallet.MainActivityKt$sam$OnClickListener$af810d58.onClick(MainActivity.kt:0)
       at android.view.View.performClick(View.java:5697)
       at android.view.View$PerformClick.run(View.java:22526)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:158)
       at android.app.ActivityThread.main(ActivityThread.java:7225)
       at java.lang.reflect.Method.invoke(Native Method) 
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

當試圖在一個boundContract

您可以創建一個使用 AccountManager 簽署交易的 Signer 實現。

這是一個假設您的 AccountManager 包含已解鎖帳戶的範例：

final AccountManager am = new AccountManager(this.getFilesDir() + "/keystore", Geth.LightScryptN, Geth.LightScryptP);

Signer mySigner = new Signer() {
   @Override
   public Transaction sign(Address address, Transaction transaction) throws Exception {
       byte[] signature = am.sign(address, transaction.getSigHash().getBytes());
       return transaction.withSignature(signature);
   }
};

而這個使用密碼字元串代替：

final AccountManager am = new AccountManager(this.getFilesDir() + "/keystore", Geth.LightScryptN, Geth.LightScryptP);

Signer mySigner = new Signer() {
   @Override
   public Transaction sign(Address address, Transaction transaction) throws Exception {
       byte[] signature = am.signWithPassphrase(address, "password", transaction.getSigHash().getBytes());
       return transaction.withSignature(signature);
   }
};

引用自：https://ethereum.stackexchange.com/questions/9193