觀察訊息佇立 Handler

MQDebugActivity.java

package com.jing.example.nknu_.mqdebugactivity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.util.Log;

import android.util.LogPrinter;

import android.view.View;

public class MQDebugActivity extends AppCompatActivity {

private static final String TAG = "EAT";

Handler mWorkerHandler;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_mqdebug);

Thread t = new Thread(){

@Override

public void run(){

Looper.prepare();

mWorkerHandler = new Handler(){

@Override

public void handleMessage(Message msg){

Log.d(TAG, "handleMessage - what = " + msg.what);

}

};

Looper.loop();//沒有此項目，則所有訊息會卡在佇立內

}

};

t.start();

}

public void Start(View v){

mWorkerHandler.sendEmptyMessageDelayed(1, 2000);

mWorkerHandler.sendEmptyMessage(2);

mWorkerHandler.obtainMessage(3,0,0,new Object()).sendToTarget();

mWorkerHandler.sendEmptyMessageDelayed(4, 300);

mWorkerHandler.postDelayed(new Runnable() {

@Override

public void run() {

Log.d(TAG, "Excute");

}

}, 400);

mWorkerHandler.sendEmptyMessage(5);

mWorkerHandler.dump(new LogPrinter(Log.DEBUG, TAG), "");

}

}

content_mqdebug.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

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"

app:layout_behavior="@string/appbar_scrolling_view_behavior"

tools:context="com.jing.example.nknu_.mqdebugactivity.MQDebugActivity"

tools:showIn="@layout/activity_mqdebug">

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="New Button"

android:id="@+id/Button"

android:layout_centerVertical="true"

android:layout_centerHorizontal="true"

android:onClick="Start" />

</RelativeLayout>