Up Navigate from Settings Activity to Main Activity

Override Original Method in Setting Activity

 @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            // Respond to the action bar's Up/Home button
            case android.R.id.home:
                super.onBackPressed();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

cited from Stack Overflow

Android 上的 Modbus TCP/IP 測試 App

I realized almost all RW features in Bit, Byte, Word, INT, DINT, REAL, LREAL.
It is a nice app for testing modbus tcp/ip with your android smartphone.

Signed APK can be found in Release folder.
PLZ give me feedback if you find bugs.

よろしくお願いいたします。

https://github.com/s94285/TcpTest1/releases/

在 Android Studio 中使用 Java 8 Lamda ---- Retrolambda Plugin

Android 目前只有 7.0 以上支援JVM8.0，因此在舊版系統中，必須使用插件來轉換
如此一來便能使用匿名表達方式Lambda來撰寫程式

ref	link
retrolambda	https://github.com/orfjackal/retrolambda
gradle-retrolambda	https://github.com/evant/gradle-retrolambda

Intent 啟動 Activity 方法

Intent 可以用來執行許多動作，這裡我們使用Intent來啟動另一個Activity
Bundle 可以放入不同類型的物件，以便在新Activity中取用

Intent intent = new Intent(MainActivity.this,ResultActivity.class);  //建立新Intent來開啟ResultActivity
Bundle bundle = new Bundle();  //建立新Bundle物件
bundle.putBooleanArray("spaced", spaced);  //放入物件 bundle.putInt("標籤名", 目標物件);
bundle.putInt("columns", columns);
bundle.putInt("inputQuantity", inputQuantity);
intent.putExtras(bundle);  //在Intent中加入Bundle物件
startActivity(intent);  //執行Intent

當你在目標Activity中，欲取出物件時

Bundle bundle = this.getIntent().getExtras();  //取得此次呼叫Intent所附帶的Bundle
spaced = bundle.getBooleanArray("spaced");  //用標籤名取得對應元件
columns = bundle.getInt("columns");
inputQuantity = bundle.getInt("inputQuantity");

利用ModbusTCPIP為Android遠端控制PLC

利用Modbus4J製作App

能夠正確讀寫 ModbusTCP/IP中的Hoding Registers
進而達到手機遠端監控PLC的目的
支援以下變數
"Bit","Byte","Word","INT","DINT","REAL","LREAL"

TcpTest1
Git: https://github.com/s94285/TcpTest1/

Modbus4J
SourceForge: https://sourceforge.net/projects/modbus4j/