Android background thread, by implementing Thread object, provided with a Runnable object.

In last exercise "Android background thread, by extending Thread", a thread was created by implementing a object of a new class extends Thread. It's another way to create a thread, implement a object of Thread class with a Runnable object provided. Actually, both version have the same out, difference in implementation only.

main.xml is same as last exercise "Android background thread, by extending Thread"

AndroidBackgroundThread.java

package com.exercise.AndroidBackgroundThread;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class AndroidBackgroundThread extends Activity {
 
 Thread backgroundThread;
 TextView myText;
 boolean myTextOn = true;
 boolean running = false;
 
 Handler handler = new Handler(){

  @Override
  public void handleMessage(Message msg) {
   // TODO Auto-generated method stub
   //super.handleMessage(msg);
   if (myTextOn){
    myTextOn = false;
    myText.setVisibility(View.GONE);
   }
   else{
    myTextOn = true;
    myText.setVisibility(View.VISIBLE);
   }
  }

 };
 
 void setRunning(boolean b){
  running = b;
 }
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       myText = (TextView)findViewById(R.id.mytext);
      
       Toast.makeText(this, "onCreate()", Toast.LENGTH_LONG).show();       
   }
  
  

 @Override
 protected void onStart() {
  // TODO Auto-generated method stub
  super.onStart();
  
       Toast.makeText(this, "onStart()", Toast.LENGTH_LONG).show();
      
       backgroundThread = new Thread(new Runnable(){

   @Override
   public void run() {
    // TODO Auto-generated method stub
    while(running){
     try {
      Thread.sleep(1000);
     } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
     handler.sendMessage(handler.obtainMessage());
    }
   }
        
       });
      
       setRunning(true);
       backgroundThread.start();
 }

 @Override
 protected void onStop() {
  // TODO Auto-generated method stub
  super.onStop();
  
  boolean retry = true;
  setRunning(false);
  
  while(retry){
   try {
    backgroundThread.join();
    retry = false;
   } catch (InterruptedException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   
  }
  
  Toast.makeText(this, "onStop()", Toast.LENGTH_LONG).show();
  
 }
}

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