Android之HandlerThread源码分析和简单使用（主线程和子线程通信、子线程和子线程通信1）

<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"
    tools:context="com.example.handler.MainActivity1" >
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ParentToChile" />
    <Button
        android:layout_below="@+id/button1"
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ChileToParent" />
    <Button
        android:layout_below="@+id/button2"
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ChileToChile" />
</RelativeLayout>

package com.example.handler;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends ActionBarActivity {
  public static final String TAG = "HandlerTest";
  public HandlerThread mHandlerThread;
  public Handler mChileHandler;
  public Handler mHandlerCToP = new Handler(){
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      int id =  (int) Thread.currentThread().getId();
      Log.d(TAG, "mHandlerCToP currentThread id is:" + id);
    }
  };
  public Button mButtonPtoC;
  public Button mButtonCtoP;
  public Button mButtonCtoC;
  public Handler mHandler = new Handler();
  public Handler mHandlerCtoC = null;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    int id =  (int) Thread.currentThread().getId();
    Log.d(TAG, "onCreate currentThread id is:" + id);
    initUIAndThread();
  }
  public void initUIAndThread() {
    mHandlerThread = new HandlerThread("chenyu");
    mHandlerThread.start();
    mHandler = new Handler(mHandlerThread.getLooper()) {
            @Override
            public void handleMessage(Message msg) {
              int id =  (int) Thread.currentThread().getId();
              Log.d(TAG, "initThread() mHandler handleMessage currentThread id is:" + id);
          switch(msg.what) {
          case 0:
            mHandlerCToP.post(new Runnable(){
              @Override
              public void run() {
                int id =  (int) Thread.currentThread().getId();
                      Log.d(TAG, "initThread() mHandlerCToP post currentThread id is:" + id);
                mButtonPtoC.setText("chenyu");
              }
            });
            break;
          case 1:
            mHandlerCToP.post(new Runnable(){
              @Override
              public void run() {
                int id =  (int) Thread.currentThread().getId();
                      Log.d(TAG, "initThread() mHandlerCToP post currentThread id is:" + id);
                mButtonCtoC.setText("chenyu");
              }
            });
          default:
            break;
          }
            }
        };
    mButtonPtoC = (Button)findViewById(R.id.button1);
    mButtonCtoP = (Button)findViewById(R.id.button2);
    mButtonCtoC = (Button)findViewById(R.id.button3);
    mButtonPtoC.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        int id =  (int) Thread.currentThread().getId();
            Log.d(TAG, "mButtonPtoC currentThread id is:" + id);
        Log.d(TAG, "mHandlerPToc msg.what is 0");
        mHandler.sendEmptyMessage(0);
      }
    });
    mButtonCtoP.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        int id =  (int) Thread.currentThread().getId();
              Log.d(TAG, "mButtonCtoP currentThread id is:" + id);
        Log.d(TAG, "mHandlerPToc msg.what is 0");
        mHandlerCToP.sendEmptyMessage(0);
      }
    });
    mButtonCtoC.setOnClickListener(new OnClickListener(){
      @Override
      public void onClick(View v) {
        new Thread(new Runnable(){
          @Override
          public void run() {
            int id =  (int) Thread.currentThread().getId();
                  Log.d(TAG, "mButtonCtoC currentThread id is:" + id);
            Log.d(TAG, "mHandlerCToc msg.what is 1");
            mHandler.sendEmptyMessage(1);
          }
        }).start();
      }
    });
  }
   @Override
   protected void onDestroy() {
     super.onDestroy();
       mHandlerThread.quit();
   }    
}