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作为一个菜鸟，每个星期写一篇随笔来记录这周所学是很有必要的：
1.gson解析json，重点在于构建json数据的实体类，不过现在android studio里有gson Formart这个快速构建实体类的工具了，所以比较容易上手。
2.thinkandroid框架中的联网请求，同步（SyncHttpClient）,异步（AsyncHttpClient）,但可能有点过时了，毕竟这个框架几年都没有更新维护了。
3.自定义空间及属性。
4.glide图片加载缓存，okhttp联网请求及其封装的类OkHttpClientManager。
5.以上几点主要是jar包什么的，其实基本上就那么几个固定的方法。所以着重讲的是消息推送机制，由于使用的API是23的，所以跟以往的不太一样。具体如下：
（一）.首先是activity_main.xml布局：
1 <?xml version="1.0" encoding="utf-8"?> 2 <RelativeLayout 3 xmlns:android="http://schemas.android.com/apk/res/android" 4 xmlns:app="http://schemas.android.com/apk/res-auto" 5 xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 6 android:layout_height="match_parent" android:fitsSystemWindows="true" 7 tools:context=".MainActivity"> 8 9 <Button 10 android:layout_width="fill_parent" 11 android:layout_height="wrap_content" 12 android:text="send" 13 android:onClick="sendNews" 14 android:layout_marginTop="36dp" 15 android:id="@+id/button" 16 android:layout_alignParentTop="true" 17 android:layout_alignParentStart="true" /> 18 <Button 19 android:layout_width="fill_parent" 20 android:layout_height="wrap_content" 21 android:text="clean" 22 android:onClick="cleanNews" 23 android:layout_below="@+id/button" 24 android:layout_alignParentStart="true" 25 android:layout_marginTop="33dp" /> 26 27 </RelativeLayout>
（二）.然后就是MainActivity.java文件：
1 package com.example.administrator.mynotification; 2 3 import android.app.Activity; 4 import android.content.Intent; 5 import android.os.Bundle; 6 import android.support.design.widget.FloatingActionButton; 7 import android.support.design.widget.Snackbar; 8 import android.support.v7.app.AppCompatActivity; 9 import android.support.v7.widget.Toolbar; 10 import android.view.View; 11 import android.view.Menu; 12 import android.view.MenuItem; 13 14 public class MainActivity extends Activity { 15 16 @Override 17 protected void onCreate(Bundle savedInstanceState) { 18 super.onCreate(savedInstanceState); 19 setContentView(R.layout.activity_main); 20 } 21 public void sendNews(View view){ 22 Intent intent = new Intent(); 23 intent.setAction("cjj_SERVICE"); 24 startService(intent); 25 } 26 public void cleanNews(View view){ 27 Intent intent = new Intent(); 28 intent.setAction("cjj_SERVICE"); 29 stopService(intent); 30 } 31 }
（三）.最后就是NotificationService文件：
1 package com.example.administrator.mynotification; 2 3 import android.app.Notification; 4 import android.app.NotificationManager; 5 import android.app.PendingIntent; 6 import android.app.Service; 7 import android.content.Context; 8 import android.content.Intent; 9 import android.os.IBinder; 10 11 /** 12 * Created by Administrator on 2015/10/30. 13 */ 14 public class NotificationService extends Service { 15 private Notification.Builder notification; 16 private Intent mintent; 17 private PendingIntent pendingIntent; 18 private NotificationManager notificationManager = null; 19 private MessageThread messageThread; 20 private int notificationID = 1; 21 22 @Override 23 public IBinder onBind(Intent intent) { 24 return null; 25 } 26 27 @Override 28 public int onStartCommand(Intent intent, int flags, int startId) { 29 notification = new Notification.Builder(getApplicationContext()); 30 notification.setSmallIcon(R.mipmap.ic_launcher); 31 notification.setContentTitle("来消息啦！"); 32 notification.setDefaults(Notification.DEFAULT_SOUND); 33 mintent = new Intent(this,MainActivity.class); 34 pendingIntent =PendingIntent.getActivity(this,0,mintent,0); 35 notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 36 messageThread = new MessageThread(); 37 messageThread.start(); 38 return super.onStartCommand(intent, flags, startId); 39 40 41 } 42 class MessageThread extends Thread{ 43 public void run(){ 44 notification.setContentText("已收到信息！"); 45 notification.setContentIntent(pendingIntent); 46 notificationManager.notify(notificationID,notification.build()); 47 notificationID++; 48 } 49 } 50 51 @Override 52 public void onDestroy() { 53 super.onDestroy(); 54 } 55 }
（四）.当然也不能忘记在manifest.xml文件中注册service
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="com.example.administrator.mynotification" > 4 5 <application 6 android:allowBackup="true" 7 android:icon="@mipmap/ic_launcher" 8 android:label="@string/app_name" 9 android:supportsRtl="true" 10 android:theme="@style/AppTheme" > 11 <activity 12 android:name=".MainActivity" 13 android:label="@string/app_name" 14 android:theme="@style/AppTheme.NoActionBar" > 15 <intent-filter> 16 <action android:name="android.intent.action.MAIN" /> 17 18 <category android:name="android.intent.category.LAUNCHER" /> 19 </intent-filter> 20 </activity> 21 <service android:name=".NotificationService"> 22 <intent-filter> 23 <action android:name="cjj_SERVICE"></action> 24 </intent-filter> 25 </service> 26 </application> 27 28 </manifest>
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原文地址：http://www.cnblogs.com/up513194962/p/4927446.html
