我正在使用Android DownloadManager
下载一些XMB
文件,如果DownloadManager
完成下载,则会在正常情况下发送broadcast
操作android.intent.action.DOWNLOAD_COMPLETE
。
我的问题是,如果互联网连接丢失了。它会发送任何广播吗?如果服务器停止提供DownloadManager
所做的事情,则介于两者之间。也许这是一个愚蠢的问题,我的文件非常小,所以我无法测试这种情况。
有人可以告诉我DownloadManager
在这种情况下的作用吗?
答案 0 :(得分:2)
广播将被发送。您需要检查DownloadManager
的状态以确定它是否成功。例如:
private DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {
long downloadId = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0);
Query query = new Query();
query.setFilterById(enqueue);
Cursor c = dm.query(query);
if (c.moveToFirst()) {
int columnIndex = c.getColumnIndex(DownloadManager.COLUMN_STATUS);
if (DownloadManager.STATUS_SUCCESSFUL == c.getInt(columnIndex)) {
// handle data
} else if (DownloadManager.STATUS_FAILED == c.getInt(columnIndex)) {
// handle error
}
}
}
}
};
答案 1 :(得分:0)
礼貌:Android DownloadManager Example
我仅在 DownloadManager.ACTION_DOWNLOAD_COMPLETE 广播中注册接收器。仅当下载成功完成时才调用
遵循这三个步骤
按照下面的代码片段所示创建一个BroadcastReceiver,在接收器内部,我们只需将接收到的下载ID与入队下载进行匹配,即可检查接收到的广播是否是我们的下载内容。
private BroadcastReceiver onDownloadComplete = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
//Fetching the download id received with the broadcast
long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
//Checking if the received broadcast is for our enqueued download by matching download id
if (downloadID == id) {
Toast.makeText(MainActivity.this, "Download Completed", Toast.LENGTH_SHORT).show();
}
}
};
创建了BroadcastReceiver之后,您可以在活动的onCreate方法中注册ACTION_DOWNLOAD_COMPLETE。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
registerReceiver(onDownloadComplete,new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
}
在onDestroy中注销BroadcastReceiver也是很重要的。这样可以确保您仅在活动处于活动状态时才收听此广播
@Override
public void onDestroy() {
super.onDestroy();
unregisterReceiver(onDownloadComplete);
}
完整示例here