Android remote control Java source code, client

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This code is from project: Raspberry pi and android simple remote control

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AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ctrl"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="10" />
  <uses-permission android:name="android.permission.INTERNET"> </uses-permission>
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"> </uses-permission>
  <uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.ctrl.Control_1"
            android:label="Home Control" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

control_1.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="@drawable/background"
    tools:context=".Control_1">

    <ToggleButton
        android:id="@+id/tb_1"
        android:layout_width="100dp"
        android:layout_height="60dp"
        android:layout_alignParentLeft="true"
        android:textOn="ON"
        android:textOff="OFF"
        android:layout_alignParentTop="true"/>

    <ToggleButton
        android:id="@+id/tb_2"
        android:layout_width="100dp"
        android:layout_height="60dp"
        android:layout_alignLeft="@+id/tb_1"
        android:layout_below="@+id/tb_1"
        android:textOn="ON"
        android:textOff="OFF"
        android:layout_marginTop="22dp"/>

    <ToggleButton
        android:id="@+id/tb_3"
        android:layout_width="100dp"
        android:layout_height="60dp"
        android:layout_alignLeft="@+id/tb_2"
        android:layout_below="@+id/tb_2"
        android:textOn="ON"
        android:textOff="OFF"
        android:layout_marginTop="22dp"/>

    <ToggleButton
        android:id="@+id/tb_4"
        android:layout_width="100dp"
        android:layout_height="60dp"
        android:layout_alignLeft="@+id/tb_3"
        android:layout_below="@+id/tb_3"
        android:textOn="ON"
        android:textOff="OFF"
        android:layout_marginTop="22dp"/>

    <TextView
        android:id="@+id/tv_Status"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:layout_alignLeft="@+id/tb_4"
        android:layout_below="@+id/tb_4"
        android:layout_marginTop="20dp"
        android:textColor="#ffffff"
        android:shadowColor="#ff0000"/>

    <TextView
        android:id="@+id/tv_B1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/tb_1"
        android:layout_alignBottom="@+id/tb_1"
        android:layout_marginLeft="22dp"
        android:layout_toRightOf="@+id/tb_1"
        android:singleLine="true"
        android:textColor="#ffffff"
        android:textAppearance="?android:attr/textAppearanceMedium"/>

    <TextView
        android:id="@+id/tv_B2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/tb_2"
        android:layout_alignBottom="@+id/tb_2"
        android:layout_alignLeft="@+id/tv_B1"
        android:singleLine="true"
        android:textColor="#ffffff"
        android:textAppearance="?android:attr/textAppearanceMedium"/>

    <TextView
        android:id="@+id/tv_B3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/tb_3"
        android:layout_alignBottom="@+id/tb_3"
        android:layout_alignLeft="@+id/tv_B2"
        android:singleLine="true"
        android:textColor="#ffffff"
        android:textAppearance="?android:attr/textAppearanceMedium"/>

    <TextView
        android:id="@+id/tv_B4"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/tb_4"
        android:layout_alignBottom="@+id/tb_4"
        android:layout_alignLeft="@+id/tv_B3"
        android:singleLine="true"
        android:textColor="#ffffff"   
        android:textAppearance="?android:attr/textAppearanceMedium"/>

</RelativeLayout>

dimens.xml

<resources>

    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>

</resources>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Ctrl</string>

</resources>

styles.xml

<resources>

    <!--
        Base application theme, dependent on API level. This theme is replaced
        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
    -->
    <style name="AppBaseTheme" parent="android:Theme.Light">
        <!--
            Theme customizations available in newer API levels can go in
            res/values-vXX/styles.xml, while customizations related to
            backward-compatibility can go here.
        -->
    </style>

    <!-- Application theme. -->
    <style name="AppTheme" parent="AppBaseTheme">
        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
    </style>

</resources>

CommandManager.java

package com.example.ctrl;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;

import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.UnknownHostException;



// Main class
public class CommandManager {
   
   private String serverIpAddress = null; 
   private int    serverPort      = 0;
   
   private String responceString = null;     // here will be answer from 
                                             // raspberry
   
   private int    readWaitSecTime = 0;       // wait for reply from raspberry
   private int    error           = 0;       // status of communication
   

   // getter, setter
   public String getServerIpAddress() {
      return serverIpAddress;
   }


   public void setServerIpAddress(String serverIpAddress) {
      this.serverIpAddress = serverIpAddress;
   }


   public void setServerPort(int serverPort) {
      this.serverPort = serverPort;
   }


   public int getError() {
      return error;
   }


   public int setReadWaitSecTime(int readWaitSecTime) {
      int prev = this.readWaitSecTime;
      
      this.readWaitSecTime = readWaitSecTime;      
      return prev;
   }


   public String getResponceString() {
      return responceString;
   }
  


   // This method sends command to other side of the wire and
   // fetch response. If there was any error, then 'error' variable
   // is set.

   // When send -> recv will success, function returns 'true' if not,
   // 'false'.

   public boolean execute(String command) {
      
      InetAddress serverAddr              = null;
      Socket         serverSocket         = null;
      InputStream    serverInputStream    = null;
      OutputStream   serverOutputStream   = null;
      boolean        readOk               = false;
      
      InetSocketAddress inetAddr          = null;

      this.error           = 0;
      this.responceString  = null;
                  
      try {

         serverAddr  = InetAddress.getByName(serverIpAddress);
         inetAddr    = new InetSocketAddress(serverAddr, serverPort);

      } catch (UnknownHostException e1) {

         this.error = -3;
         return readOk;

      }  
      
      try {

         serverSocket = new Socket();
         serverSocket.connect(inetAddr, 100);

      } catch (IOException e) {

         this.error = -1;
         return readOk;

      }
      
      try {

         if (serverSocket.isConnected() == true) {                               

            serverInputStream  = serverSocket.getInputStream();
            serverOutputStream = serverSocket.getOutputStream();
         
            command+="\r\n";
            serverOutputStream.write(command.getBytes());   
     
            // loop pools input stream for data 
            for(int i = 0; i < readWaitSecTime * 50; i++) {

               // weak, but working
               int bytesToRead = serverInputStream.available();
               
               if ( bytesToRead != 0) {
                  
                  byte[] bytes = new byte[30];
                     
                  serverInputStream.read(bytes,0, bytesToRead);

                  this.responceString = new String(bytes,0, bytesToRead );
                                    
                  readOk = true;
                  break;
               }

               Thread.sleep(10);
            }
         
            if (readOk == false)
               this.error = -2;

            serverInputStream.close();
            serverOutputStream.close();

            } else {
               this.error = -1;
            }
               
         serverSocket.close();

      } catch (IOException e) {

         this.error = -4;
         return readOk;    

      } catch (InterruptedException e) {

         this.error = -5;
         return readOk;

      }
      
      return readOk;
   }


}

Control_1.java

package com.example.ctrl;

import java.util.ArrayList;

import android.os.Bundle;
import android.app.Activity;
import android.app.KeyguardManager;
import android.app.KeyguardManager.KeyguardLock;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGestureListener;
import android.support.v4.view.GestureDetectorCompat;

import android.view.GestureDetector;
import android.view.MotionEvent;


import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.ToggleButton;

// Main class 
public class Control_1 extends Activity implements OnCheckedChangeListener {

   private GestureDetectorCompat mDetector; 

   // arrays for buttons and thier descriptions
   ArrayList<ToggleButton> buttons     = new ArrayList<ToggleButton>();
   ArrayList<TextView>     buttonsText = new ArrayList<TextView>();
   
   TextView       tvStatus;

   final int      WAIT_SHORT     = 1;
   final int      WAIT_LONG      = 4;
   
   int            screenNum      = 0; 
   boolean        screenChange   = false;
   
   KeyguardManager   keyguardManager   = null;
   KeyguardLock      lock              = null; ;
   
   // create new object to communicate with raspberry
   CommandManager cm = new CommandManager();
  
 

   // This method refreshes button prefixes, descriptions and states 
   // Once we've make a gesture (left, right), screen prefix was changed
   // and button prefixes, description and states needs to be updated.

   private void refreshButtons(int screenNum) {

      short i;
     
      // update new screen number 
      this.setTitle("Control " + screenNum);
      
      // set all buttons to OFF
      for (ToggleButton b : buttons)
         b.setChecked(false);    
      
      // clear all buttons descriptions
      for (TextView t : buttonsText)
         t.setText("");
      
      // check if is worth to fetch descriptions and staes.
      if( !cm.execute("GET PING CONN") ) {
         showError();
         return;
      }
  

      // send, recv. and set names for buttons with
      // new prefixes 
      i = 1;
      for (TextView t : buttonsText)
          if( cm.execute("GET NAME B" + (4*screenNum + i++)) )
            t.setText(cm.getResponceString());
    
      
      // send, recv. and set states for buttons with
      // new prefixes 
      i = 1;
      for (ToggleButton b : buttons)
          if( cm.execute("GET STATE B" + (4*screenNum + i++ )) )
            b.setChecked( cm.getResponceString().contains("ON"));

      // show last error
      showError();
   }
   
   
   @Override
   protected void onPause() {
      // when app goes into pause, reenable screen lock
      lock.reenableKeyguard();
      super.onPause();
   }
   

   @Override
   protected void onResume() {

      // refresh button desc. , names and states
      screenChange = true; // this will prevent to fire
                           // OnCheckedChangeListener logic

      refreshButtons(screenNum);
      screenChange = false;

      // disable screen lock
      lock.disableKeyguard();

      super.onResume();
   }

   
   @Override
   protected void onDestroy() {
      // when app goes off, reenable screen lock
      lock.reenableKeyguard();
      super.onDestroy();      
   }
   
   
   @Override
   public void finish() {
      // when app goes off, reenable screen lock
      lock.reenableKeyguard();
      super.finish();
   }
   

   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      
      setContentView(R.layout.control_1);
             
      keyguardManager   = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
      lock              = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
      
      lock.disableKeyguard();

      mDetector = new GestureDetectorCompat(this, new MyGestureListener());
      
      cm.setServerIpAddress("192.168.1.104");
      cm.setServerPort(8000);
      
      cm.setReadWaitSecTime(WAIT_SHORT);
      
      buttons.add( (ToggleButton) findViewById(R.id.tb_1) );
      buttons.add( (ToggleButton) findViewById(R.id.tb_2) );
      buttons.add( (ToggleButton) findViewById(R.id.tb_3) );
      buttons.add( (ToggleButton) findViewById(R.id.tb_4) );

      // add listener      
       for (ToggleButton b : buttons)
          b.setOnCheckedChangeListener(this);
      
      tvStatus = (TextView)    findViewById(R.id.tv_Status);
      
      buttonsText.add( (TextView) findViewById(R.id.tv_B1) );
      buttonsText.add( (TextView) findViewById(R.id.tv_B2) );
      buttonsText.add( (TextView) findViewById(R.id.tv_B3) );
      buttonsText.add( (TextView) findViewById(R.id.tv_B4) );
      
      setStatus("empty");
   }


   @Override 
   public boolean onTouchEvent(MotionEvent event){ 
     this.mDetector.onTouchEvent(event);
     return super.onTouchEvent(event);
   }


   class MyGestureListener extends GestureDetector.SimpleOnGestureListener implements OnGestureListener {

      @Override
      public boolean onFling(MotionEvent arg0, MotionEvent arg1,
            float arg2, float arg3) {

         // slide from right to left on screen
         if ((arg0.getX() - arg1.getX()) > 0 ) {
            
            // slide on upper 1/5 of screen will jump by 5 screens
            if(arg0.getY() < 110)
               screenNum+=5;           
            else  // slide on 4/5 of screen will jump by 1 screen
               screenNum++;

            screenChange = true; // prevent onChecked... logic
            refreshButtons(screenNum);
            screenChange = false;
         }
         
         // slide from left to right
         if ((arg1.getX() - arg0.getX()) > 0 ) {
            
            if(arg0.getY() < 110)
               screenNum-=5;           
            else
               screenNum--;            
            
            if (screenNum < 0) {
               screenNum = 0;
            }
            screenChange = true;
            refreshButtons(screenNum); 
            screenChange = false;
         }
         
         return false; 
      }

 
      public  boolean onDoubleTap(MotionEvent e) {
         // on double tap, refresh current screen
         screenChange = true;
         refreshButtons(screenNum);
         screenChange = false;
         return false;
      }

      
      public  void onLongPress(MotionEvent e) {
         screenNum = 0;
         screenChange = true;
         refreshButtons(screenNum);
         screenChange = false;
      }


      @Override
      public void onGesture(GestureOverlayView arg0, MotionEvent arg1) {}


      @Override
      public void onGestureCancelled(GestureOverlayView arg0, MotionEvent arg1) {}

      
      @Override
      public void onGestureEnded(GestureOverlayView arg0, MotionEvent arg1) {}


      @Override
      public void onGestureStarted(GestureOverlayView arg0, MotionEvent arg1) {}
   }


   @Override
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
     
      // do nothing when screen is changed 
      if (screenChange == true ) {
         return;
      }
      
      String bName = "";
      
      // fetch prefix of changed button
      switch(buttonView.getId()) {     
         case  R.id.tb_1: { bName = "B"+(4*screenNum + 1 ); } break;    
         case  R.id.tb_2: { bName = "B"+(4*screenNum + 2 ); } break;       
         case  R.id.tb_3: { bName = "B"+(4*screenNum + 3 ); } break;       
         case  R.id.tb_4: { bName = "B"+(4*screenNum + 4 ); } break;
      }  

      int prev = cm.setReadWaitSecTime(WAIT_SHORT);
      
      // send new state, recv. respnoce and set new button status
      if( cm.execute("SET STATE " + bName + " " + isChecked) ) {
         buttonView.setChecked( cm.getResponceString().contains("ON"));       
      } else {
         showError();
         buttonView.setChecked(false);
      }

      cm.setReadWaitSecTime(prev);
   }
   

   public void setStatus(String status) {       
      tvStatus.setText("Status: " +status);
   }
   

   public boolean showError() {
      if(cm.getError() == 0) {
         setStatus("ok");
         return false;
      }
               
      switch(cm.getError()) {
         case -1: setStatus("Server not reached"); break;            
         case -2: setStatus("Read timeout"); break;         
         case -3: setStatus("Unknown host"); break;         
         case -4: setStatus("Interrupted");break;
      };
      
      return true;
   }


}