編輯:Android資訊
本文通過建立一個線程,在後台持續輪詢獲取服務器推送消息,主要實現以下幾個功能:
@EBean public class PushThread extends Thread { private Handler advertisementHandler; private Handler appPushHandler; private Context mContext; private int period = 2000; private NotificationManager mNM; private Notification notification; private boolean run; @Pref MyPrefs_ myPrefs; /** * 構造方法,初始化參數 * @param mContext */ public PushThread(Context mContext) { this.mContext = mContext; } /** * 啟動線程 */ public void startThread() { L.d("[PushThread] startThread"); run = true; advertisementHandler = new Handler(); appPushHandler = new Handler(); advertisementHandler.postDelayed(getAdvertisementRunable, period); L.d("PushThread run"); } /** * 停止線程 */ public void stopThread() { L.d("[PushThread] stopThread"); run = false; advertisementHandler.removeCallbacks(getAdvertisementRunable); appPushHandler.removeCallbacks(getAppPushRunable); } }
startThread()初始化Handler,啟動線程;stopThread()移除線程,標志位run用來確保關閉所有線程。
/** * 獲取advertisement的線程 */ Runnable getAdvertisementRunable = new Runnable() { @Override public void run() { L.d("getAdvertisementRunable"); IotClass.getAdvertisementInfo("advertisement", new IotClass.OnPushInfoListener() { @Override public void receive(String respons) { Gson gson = new Gson(); AdvertismentBean advertismentBean = gson.fromJson(respons, AdvertismentBean.class); L.d("respons advertismentBean: " + advertismentBean); // L.d("respons: " + respons); if (myPrefs.advertisementId().get() == advertismentBean.getMessageId()) { if (myPrefs.advertisementFrequency().get() <= (System.currentTimeMillis() / 1000)) { L.d("[PushThread] getAdvertisementRunable time to show"); showNotification(advertismentBean); } else { L.d("[PushThread] getAdvertisementRunable wait..."); } } else { L.d("[PushThread] getAdvertisementRunable first show"); showNotification(advertismentBean); } } }); if (run) appPushHandler.postDelayed(getAppPushRunable, period); } };
IotClass是自己寫好的一個網絡請求的類,IotClass.getAdvertisementInfo方法獲取推送消息,結果回調後進行處理,通過Gjson序列化成對象:
Gson gson = new Gson(); AdvertismentBean advertismentBean = gson.fromJson(respons, AdvertismentBean.class);
後面是判斷messageId,如果是第一次獲取到messageId則顯示消息,否則等到時間間隔過了後再顯示,最後通過appPushHandler.postDelayed(getAppPushRunable, period);繼續去輪詢APP更新推送
/** * 獲取app推送信息的線程 */ Runnable getAppPushRunable = new Runnable() { @Override public void run() { IotClass.getAdvertisementInfo("android", new IotClass.OnPushInfoListener() { @Override public void receive(String respons) { String description; Gson gson = new Gson(); AppBean appBean = gson.fromJson(respons, AppBean.class); L.d("respons appBean: " + appBean); // L.d("respons: " + respons); if (myPrefs.appPushId().get() == appBean.getMessageId()){ if (myPrefs.appPushFrequency().get() <= (System.currentTimeMillis()/1000)) { description = getAppDescription(appBean); showUpgradeDialog(appBean, Utils.appDowanloadUrl+appBean.getAndroid_filename(), description); L.d("[PushThread] getAppPushRunable time to show"); } else{ L.d("[PushThread] getAppPushRunable wait..."); } }else{ description = getAppDescription(appBean); showUpgradeDialog(appBean, Utils.appDowanloadUrl+appBean.getAndroid_filename(), description); L.d("[PushThread] getAppPushRunable first show"); } } }); if (run) advertisementHandler.postDelayed(getAdvertisementRunable, period); } };
同理,獲取app更新推送的處理與獲取推廣信息的方式類似,在最後通過advertisementHandler.postDelayed(getAdvertisementRunable, period);重新去獲取推廣信息的推送,相互調用,達到後台線程持續輪詢推送消息的效果,其中getAppDescription用來判斷系統語言,用於選擇更新提示中用英文還是中文描述:
/** * 判斷系統語言版本,返回相應的更新說明 * @param appBean * @return */ private String getAppDescription(AppBean appBean) { if (Tools.isZh(mContext)) { return appBean.getDescription(); }else { return appBean.getDescription_en(); } }
下面是AppBean的類
public class AppBean { String result; int messageId; long frequency; int android_build; String versionCode; String description; String description_en; String android_filename; String android_file_size; String android_id; @Override public String toString() { return "AppBean [result=" + result + ", messageId=" + messageId + ", frequency=" + frequency + ", android_build=" + android_build + ", versionCode=" + versionCode + ", description=" + description + ", description_en=" + description_en + ", android_filename=" + android_filename + ", android_file_size=" + android_file_size + ", android_id=" + android_id + "]"; } public String getResult() { return result; } public void setResult(String result) { this.result = result; } public int getMessageId() { return messageId; } public void setMessageId(int messageId) { this.messageId = messageId; } public long getFrequency() { return frequency; } public void setFrequency(long frequency) { this.frequency = frequency; } public int getAndroid_build() { return android_build; } public void setAndroid_build(int android_build) { this.android_build = android_build; } public String getVersionCode() { return versionCode; } public void setVersionCode(String versionCode) { this.versionCode = versionCode; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } public String getDescription_en() { return description_en; } public void setDescription_en(String description_en) { this.description_en = description_en; } public String getAndroid_filename() { return android_filename; } public void setAndroid_filename(String android_filename) { this.android_filename = android_filename; } public String getAndroid_file_size() { return android_file_size; } public void setAndroid_file_size(String android_file_size) { this.android_file_size = android_file_size; } public String getAndroid_id() { return android_id; } public void setAndroid_id(String android_id) { this.android_id = android_id; } }
AdvertismentBean與此類似,就不占篇幅了
/** * notification通知advertisement * @param advertismentBean */ private void showNotification(AdvertismentBean advertismentBean) { myPrefs.advertisementId().put(advertismentBean.getMessageId()); myPrefs.advertisementFrequency().put((int) (System.currentTimeMillis()/1000 + advertismentBean.getFrequency())); // The PendingIntent to launch our activity if the user selects this notification String url = advertismentBean.getUrl(); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(url)); PendingIntent contentIntent = PendingIntent.getActivity(mContext, 0, intent, 0); //get largeIcon from url Bitmap largeIcon = getBitmap(advertismentBean.getLargeIcon()); // Set the info for the views that show in the notification panel. notification = new Notification.Builder(mContext) .setSmallIcon(R.drawable.logo) .setLargeIcon(largeIcon) .setWhen(System.currentTimeMillis()) .setTicker(advertismentBean.getContentTitle()) .setContentTitle(advertismentBean.getContentTitle()) .setContentText(advertismentBean.getContentText()) .setSubText(advertismentBean.getSubText()) .setContentIntent(contentIntent) .build(); // Send the notification. mNM.notify(advertismentBean.getMessageId(), notification); }
首先是存儲ID號和時間間隔,以便下次輪詢判斷使用,後面設置點擊事件,跳轉到相應網頁頁面
String url = advertismentBean.getUrl(); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(url)); PendingIntent contentIntent = PendingIntent.getActivity(mContext, 0, intent, 0);
其他的則是常規的notification的消息內容設置,另外,下面用於獲取推送消息中的圖片url並顯示於notification上:
/** * 通過URL獲取圖片,生成bitmap * @param path * @return */ public static Bitmap getBitmap(String path) { try { URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setRequestMethod("GET"); if (conn.getResponseCode() == 200) { InputStream inputStream = conn.getInputStream(); Bitmap bitmap = BitmapFactory.decodeStream(inputStream); return bitmap; } } catch (MalformedURLException e) { e.printStackTrace(); } catch (ProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; }
該方法實現通過url轉化為bitmap,用於notification大圖標顯示
/** * 更新檢測對話框 * @param downloadUrl * @param newVersionInfo */ @UiThread void showUpgradeDialog(AppBean appBean, final String downloadUrl, String newVersionInfo) { myPrefs.appPushId().put(appBean.getMessageId()); myPrefs.appPushFrequency().put((int) (System.currentTimeMillis()/1000 + appBean.getFrequency())); final AlertDialog.Builder builder = new AlertDialog.Builder(mContext); builder.setTitle(R.string.Found_new_version).setMessage(newVersionInfo); builder.setPositiveButton(R.string.upgrade, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { IotClass.downLoadAppOrBin(mContext, downloadUrl, new ProgressDialog(mContext), IotClass.TYPE_APP); } }).setNegativeButton(R.string.show_next_time, null).show(); }
與消息推送類似,點擊升級按鈕後下載並安裝,下載及安裝的操作封裝在IotClass.downLoadAppOrBin中,此處不做具體展示。
主要的代碼到這裡基本結束,感覺還比較粗糙,耦合性比較大,後續還可以進行封裝,比如設置接口,將一些設置或處理暴露給外面進行處理等,這方面目前也在學習中,有什麼建議歡迎一起探討!
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