Praktikum 7 | Thread

Praktikum kali ini untuk membuat sebuah thread yang akan menampilkan pesan secara terus menerus dan sebuah bilangan acak.

Buatlah project baru seperti ketentuan berikut :
Project Name : Thread
Buitl Target : Android 2.2
Application name : Thread
Package name : www.percobaan2.com
Activity : database4

Buka file values/string.xml :

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Aplysit - IT Solution Center</string>
    <string name="app_name">Try Thread - www.aplysit.com</string>
</resources>

Selanjutnya main.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button android:text="Start"
    android:layout_height="wrap_content"
android:id="@+id/btn_start"
android:layout_width="wrap_content">
   
</Button>
<Button android:text="Stop"
    android:layout_height="wrap_content"
android:id="@+id/btn_stop"
android:layout_width="wrap_content">
   
</Button>
</LinearLayout>
 

Mythread.java :

package www.percobaan2.com;


import android.content.Context;
import android.os.Handler;

public class Mythread {
 public Handler mhandler;
 public showText text;

 public Mythread (Context context, Handler handler){
  mhandler = handler;
 }

 public synchronized void startShowText() {
  if (text == null) {
   text = new showText();
   text.start();
  }
 }

 public synchronized void stopShowText() {
  if (text != null) {
   text.requestStop();
   text = null;
  }
 }

 private class showText extends Thread {
  private volatile boolean stop = false;
   
  public void run() {
   while ((!stop)){   
    mhandler.obtainMessage(threadsimple.run,"Pesan dari thread" + Math.random()).sendToTarget();
    try {
     sleep(3000);
    }
    catch (Exception e){}
   }
   if (stop) {
    mhandler.obtainMessage(threadsimple.stop).sendToTarget();
   }
  }
 
  public synchronized void requestStop() {
            stop = true;
  }
 }
}









threadsimple.java :

package www.percobaan2.com;

import www.percobaan2.com.R;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class threadsimple extends Activity {
 public static final int run = 1;
 public static final int stop = 2;
 public Mythread thread;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        Button start = (Button)findViewById(R.id.btn_start);
        start.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {
    //  TODO Auto-generated method stub
       thread.startShowText();
       System.out.println("run");
   }
        });
       
        Button stop = (Button)findViewById(R.id.btn_stop);
        stop.setOnClickListener(new OnClickListener() {
   public void onClick(View v) {
    //  TODO Auto-generated method stub
       thread.stopShowText();
       System.out.println("stop");
   }
        });
    }
    public void onStart() {
        super.onStart();
        thread = new Mythread(this, mHandler);
       }
      
       private final Handler mHandler = new Handler() {
           @Override
           public void handleMessage(Message msg) {
               switch (msg.what) {
               case run:
                Toast.makeText(getApplicationContext(), msg.obj.toString(), 2).show();
               break;
               case stop:
                Toast.makeText(getApplicationContext(), "Thread Stop", 2).show();
               break;
               }
           }
       };
   }
    
Hasil Running :