DownloadManager 下載完成並安裝

話說blog還是要堅持寫的。僅僅是一個態度的問題 …….

DownloadManager 是Android系統提供的一個很好用的下載類。通過此類可以很方便的下載檔案並在通知欄顯示進度，不用再重寫通知欄。所以記錄一下使用方法與一些技巧。望批判

直接上程式碼吧

public void download(String downloadUrl) {
        DownloadManager manager = (DownloadManager) mContext
                .getSystemService
 
(Context.DOWNLOAD_SERVICE);
        DownloadManager.Request request = new DownloadManager.Request(
                Uri.parse(downloadUrl));
        request.setDescription("更新APP");
        request.allowScanningByMediaScanner();// 設定可以被掃描到
        request.setVisibleInDownloadsUi(true);// 設定下載可見
        request.setNotificationVisibility
 
(
                DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);//下載完成後通知欄任然可見
        String fileName = downloadUrl.substring(downloadUrl.lastIndexOf("/"));// 解析fileName
        request.setDestinationInExternalPublicDir(
                Environment.DIRECTORY_DOWNLOADS, fileName);// 設定下載位置，sdcard/Download/fileName
 

        long refernece = manager.enqueue(request);// 加入下載並取得下載ID  
        SharedPreferences sPreferences = mContext.getSharedPreferences(
                "downloadplato", 0);
        sPreferences.edit().putLong("plato", refernece).commit();//儲存此次下載ID

    }

獲取並儲存此次下載ID為了方便監聽下載完成，並處理相關下載後的事情，比如下載一個app，為了提高使用者體驗就要自動彈出安裝介面。這時候我們就要進行下載監聽

DownLoadBroadcastReceiver.java

package com.android.browser;

import android.annotation.SuppressLint;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;

import com.android.browser.core.LogUtils;
/**
 * 下載完成廣播監聽：比如下載APP
 * 
 * */
public class DownLoadBroadcastReceiver extends BroadcastReceiver {

    @SuppressLint("NewApi")
    public void onReceive(Context context, Intent intent) {
        long myDwonloadID = intent.getLongExtra(
                DownloadManager.EXTRA_DOWNLOAD_ID, -1);
        LogUtils.i("下載完成 ID = " + myDwonloadID);
        SharedPreferences sPreferences = context.getSharedPreferences(
                "downloadplato", 0);
        long refernece = sPreferences.getLong("plato", 0);
        if (refernece == myDwonloadID) {
            String serviceString = Context.DOWNLOAD_SERVICE;
            DownloadManager dManager = (DownloadManager) context
                    .getSystemService(serviceString);
            Intent install = new Intent(Intent.ACTION_VIEW);
            Uri downloadFileUri = dManager
                    .getUriForDownloadedFile(myDwonloadID);
            install.setDataAndType(downloadFileUri,
                    "application/vnd.android.package-archive");
            install.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(install);
        }

    }

}

 // 記得註冊廣播

完成 Thank you . 謝謝