目的
使用DownloadManager下載檔案，並取出下載進度
問題
- permission denial
解：
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> - 使用 DownloadManager.Request.VISIBILITY_HIDDEN 時，發生SecurityException
解：
加入<uses-permission android:name="android.permission.DOWNLOAD_WITHOUT_NOTIFICATION" />
實作
public class DownloadActivity extends Activity {
private TextView mConsole;
private void setupUnit() {
mConsole = (TextView) findViewById(R.id.console);
}
private void init() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_download);
setupUnit();
init();
Downloader d = new Downloader();
d.download(this, "http://www.wall001.com/1280x1024/"
+ "1280_1024_nature_scene_wallpapers_06/"
+ "mxxx01/1280_1024_nature_wallpaper_3210710877.jpg");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_download, menu);
return true;
}
private Handler mHander = new Handler() {
public void handleMessage(Message msg) {
String log = (String) msg.obj;
mConsole.append(log);
}
};
private class Downloader {
DownloadManager downloadManager;
long downloadId;
boolean is = true;
Cursor c;
public void download(Context context, String url) {
downloadManager = (DownloadManager) context
.getSystemService(Context.DOWNLOAD_SERVICE);
Uri uri = Uri.parse(url);
downloadId= downloadManager.enqueue(new DownloadManager.Request(
uri)
.setAllowedNetworkTypes(
DownloadManager.Request.NETWORK_WIFI |
DownloadManager.Request.NETWORK_MOBILE)
.setAllowedOverRoaming(false)
.setNotificationVisibility(
DownloadManager.Request.VISIBILITY_HIDDEN)
.setDestinationInExternalPublicDir(
Environment.DIRECTORY_DOWNLOADS, "test.jpg"));
final Query query = new DownloadManager.Query();
query.setFilterById(downloadId);
// 取出下載進度
new Thread(new Runnable() {
long size = 0;
long total = 0;
@Override
public void run() {
while (is) {
c = downloadManager.query(query);
if (c != null) {
if (c.moveToFirst()) {
size = c.getInt(c
.getColumnIndex(
downloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
total = c.getLong(c
.getColumnIndex(downloadManager.COLUMN_TOTAL_SIZE_BYTES));
mHander.sendMessage(mHander.obtainMessage(-1,
"Progress- " + size + " / " + total
+ "\n"));
if (size == total)
is = false;
}
}
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
}
}
