Android HandlerThread、Looper、Handler知識ポイント整理

続行...
テストdemoコード:
  TestHandlerThreadActivity.java:

package com.example.testandroid;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Handler.Callback;
import android.os.HandlerThread;
import android.os.Message;

public class TestHandlerThreadActivity extends Activity {
	HandlerThread handlerThread = new HandlerThread("test");
	Handler handler;

	Handler mMainHandler;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		System.out.println("cur_id=" + Thread.currentThread().getId());

		handlerThread.start();
		System.out.println("handlerThread.id=" + handlerThread.getId());
		// post(runnable)，       run()，run() ThreadId UIThread    
		// handler = new Handler();
		// post(runnable)， runnable   handlerThread ，   UIThread 
		handler = new Handler(handlerThread.getLooper(), new Callback() {

			@Override
			public boolean handleMessage(Message msg) {
				System.out
						.println("receive Callback message.whatA=" + msg.what);
				if (msg.what == 1) {
					return true;//        
				} else if (msg.what == 3) {
					System.out.println("handlerThread msg thread_id="
							+ Thread.currentThread().getId());
					for (int i = 0; i < 20; i++) {
						try {
							Thread.sleep(1000);
							System.out.printf("    %d 
", i);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
					return true;
				} else {
					return false; //    handleMessage()     
				}
			}
		}) {
			@Override
			public void handleMessage(Message msg) {
				// TODO Auto-generated method stub
				super.handleMessage(msg);
				System.out.println("receive message.whatB=" + msg.what);
			}
		};
		
		handler.post(new Runnable() {

			@Override
			public void run() {
				System.out.println("handler_post_cur_id="
						+ Thread.currentThread().getId());
				handler.sendEmptyMessage(1);
				handler.sendEmptyMessage(2);
			}
		});

		mMainHandler = new Handler(){
			@Override
			public void handleMessage(Message msg) {
				// TODO Auto-generated method stub
				super.handleMessage(msg);
				System.out.println("mMainHandler msg thread_id="
						+ Thread.currentThread().getId());
			}
		};
		mMainHandler.post(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				System.out.println("mMainHandle_post_cur_id="
						+ Thread.currentThread().getId());
			}
		});

		handler.sendEmptyMessage(3);
		mMainHandler.sendEmptyMessage(1);
		
	}

}