Android notification动态设置网络图片icon

公司项目有个需求，需要在发送Notification的时候动态加载服务器的图片，在网上找了半天，没有完整的代码。研究了半天总算实现了。大概思路如下

自定义Notification的布局文件，这样能够很方便设置View的属性。

首先加载网络图片，使用BitmapFactory.decodeStream解析出Bitmap，然后设置到自定义布局文件中的ImageView上。

自定义Notification布局如下：

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >

     <ImageView
         android:id="@+id/image"
         android:layout_width="45dip"
         android:layout_height="45dip"
         android:layout_alignParentLeft="true"
         android:layout_marginBottom="8.0dip"
         android:layout_marginLeft="8.0dip"
         android:layout_marginRight="10dp"
         android:layout_marginTop="8.0dip" />

     <TextView
         android:id="@+id/title"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="8.0dip"
         android:layout_toRightOf="@id/image"
         android:textSize="16.0dip" />

     <TextView
         android:id="@+id/text"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_below="@id/title"
         android:layout_marginTop="3.0dip"
         android:layout_toRightOf="@id/image"
         android:textSize="16.0dip" />

     <TextView
         android:id="@+id/time"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentRight="true"
         android:layout_centerVertical="true"
         android:layout_marginRight="8.0dip"
         android:textSize="16.0dip" />

 </RelativeLayout>

Java实现代码：

 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;

 import android.app.Activity;
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.AsyncTask;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.RemoteViews;

 public class MainActivity extends Activity {
     private String url = "http://www.takungpao.com/world/content/image/attachement/jpg/site2/20120605/d4bed9b92d221137df0511.jpg";
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         findViewById(R.id.btn).setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 set(url);
             }
         });
     }
     public void set(String urlStr) {
         new AsyncTask<String, Void, Bitmap>() {
             @Override
             protected Bitmap doInBackground(String... params) {
                 try {
                     URL url = new URL(params[0]);
                     HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                     conn.setConnectTimeout(6000);//设置超时
                     conn.setDoInput(true);
                     conn.setUseCaches(false);//不缓存
                     conn.connect();
                     int code = conn.getResponseCode();
                     Bitmap bitmap = null;
                     if(code==200) {
                         InputStream is = conn.getInputStream();//获得图片的数据流
                         bitmap = BitmapFactory.decodeStream(is);
                     }
                     return bitmap;
                 } catch (MalformedURLException e) {
                     e.printStackTrace();
                     return null;
                 } catch (IOException e) {
                     e.printStackTrace();
                     return null;
                 }
             }

             @Override
             protected void onPostExecute(Bitmap result) {
                 super.onPostExecute(result);
                 if (result != null) {
                     showNotification(result);
                 }
             }
         }.execute(urlStr);
     }
     private void showNotification(Bitmap bitmap){
         NotificationManager manager = (NotificationManager) MainActivity.this
                 .getSystemService(Context.NOTIFICATION_SERVICE);
         Notification noti = new Notification();
         noti.flags = Notification.FLAG_AUTO_CANCEL;
         noti.icon = R.drawable.ic_launcher;
         // 1、创建一个自定义的消息布局 notification.xml
         // 2、在程序代码中使用RemoteViews的方法来定义image和text。然后把RemoteViews对象传到contentView字段
         RemoteViews remoteView = new RemoteViews(this.getPackageName(),
                 R.layout.cus_noti);
         remoteView.setImageViewResource(R.id.image,
                 R.drawable.ic_launcher);
         remoteView.setImageViewBitmap(R.id.image, bitmap);
         remoteView.setTextViewText(R.id.text,
                 "Hello,this message is in a custom expanded view");
         noti.contentView = remoteView;
         // 3、为Notification的contentIntent字段定义一个Intent(注意，使用自定义View不需要setLatestEventInfo()方法)

         // 这儿点击后简答启动Settings模块
          PendingIntent contentIntent = PendingIntent.getActivity
          (MainActivity.this, 0,new
          Intent("android.settings.SETTINGS"), 0);
          noti.contentIntent = contentIntent;
         manager.notify(1, noti);
     }
 }