Message, Handler, obtain, Thread

출처: 슈퍼드로이드

16. Activity에 대해서 - Thread 와 Android Main Thread

http://cafe.daum.net/superdroid/aAfL/98

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package com.test.ThreadTest;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.widget.TextView;

public class A extends Activity {

static final int REQUEST_DRAW_COUNT = 1;

TextView   mTextView = null;

Handler mHandler = null;

int mCount = 0;

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        

        mTextView = (TextView) findViewById(R.id.text_view);

        

        //mHandler = new Handler(); // runnable 방식

        

        mHandler = new Handler() // handleMessage 방식

        {

        public void handleMessage(Message msg) {

        switch (msg.what)

        {

        case REQUEST_DRAW_COUNT:

        mCount = msg.arg1;

        mTextView.setText("Count : " + mCount);

        break;

        }

        }

        };

    }

    

    public void onClick(View v)

    { 

    switch(v.getId())

    {

    case R.id.set_count_btn:

    new Thread()

    {

    public void run()

    {

    /*  // runnable방식

    Runnable runnable = new Runnable ()

    {

    public void run()

    {

    mTextView.setText("count : " + mCount);

    }

    };

    Message msg = Message.obtain(mHandler, runnable);

    mCount = 50; 

    mHandler.sendMessage(msg); */

   

    // handleMessage 방식

    Message msg = Message.obtain(mHandler, REQUEST_DRAW_COUNT);

    msg.arg1 = 50;

    mHandler.sendMessage(msg);

    }  

    }.start();

   

    /*    //오류

    new Thread()

    {

    @Override

        public void run() 

        {

    mTextView.setText("Count : " + 50);

        }

   

    }.start(); */

   

    break;

    }

    }

}