Android uses dowanloadmanager to download objects and obtain the download progress.

Package com. koolsee. gallery; import java. util. arrayList; import java. util. list; import java. util. timer; import java. util. timerTask; import android. app. activity; import android. app. downloadManager; import android. app. downloadManager. request; import android. content. broadcastReceiver; import android. content. context; import android. content. intent; import android. content. intentFilter; import android. dat Abase. contentObserver; import android. database. cursor; import android.net. uri; import android. OS. bundle; import android. OS. environment; import android. OS. handler; import android. util. log; import android. view. keyEvent; import android. view. motionEvent; import android. view. view; import android. view. view. onKeyListener; import android. view. view. onTouchListener; import android. widget. adapterView; import Android. widget. adapterView. onItemClickListener; import android. widget. adapterView. onItemSelectedListener; import android. widget. button; import android. widget. imageView; import android. widget. textView; import com. koolsee. gallery. adapter. recommendAdapter; import com. koolsee. gallery. model. recommend; import com. koolsee. gallery. widget. galleryFlow;/*** homepage ** @ author zengxiaotao */public class testA Ctivity extends Activity {private DownloadManager dowanloadmanager = null; private DownloadChangeObserver downloadObserver; private long lastDownloadId = 0; public static final Uri CONTENT_URI = Uri. parse ("content: // downloads/my_downloads"); @ Override protected void onCreate (Bundle savedInstanceState) {// TODO Auto-generated method stub super. onCreate (savedInstanceState); setContentView (R. layout. Test); String serviceString = Context. DOWNLOAD_SERVICE; dowanloadmanager = (DownloadManager) getSystemService (DOWNLOAD_SERVICE); Uri uri = Uri. parse ("http://commonsware.com/misc/test.mp4"); Environment. getExternalStoragePublicDirectory (Environment. DIRECTORY_DOWNLOADS ). mkdir (); lastDownloadId = dowanloadmanager. enqueue (new DownloadManager. request (uri ). setAllowedNetworkTypes (DownloadManager. requ Est. NETWORK_MOBILE | DownloadManager. request. NETWORK_WIFI ). setAllowedOverRoaming (false ). setDestinationInExternalPublicDir (Environment. DIRECTORY_DOWNLOADS, "test.mp4"); registerReceiver (receiver, new IntentFilter (DownloadManager. ACTION_DOWNLOAD_COMPLETE); downloadObserver = new DownloadChangeObserver (null); getContentResolver (). registerContentObserver (CONTENT_URI, true, downloadObserver);} cl Ass DownloadChangeObserver extends ContentObserver {public DownloadChangeObserver (Handler handler) {super (handler); // TODO Auto-generated constructor stub} @ Override public void onChange (boolean selfChange) {queryDownloadStatus () ;}} private BroadcastReceiver receiver ER = new BroadcastReceiver () {@ Override public void onReceive (Context context, Intent intent) {// The download id can be obtained here, in this way, you can know which file has been downloaded. Applicable to the monitoring logs of multiple download tasks. v ("tag", "" + intent. getLongExtra (DownloadManager. EXTRA_DOWNLOAD_ID, 0); queryDownloadStatus () ;}}; private void queryDownloadStatus () {DownloadManager. query query = new DownloadManager. query (); query. setFilterById (lastDownloadId); Cursor c = dowanloadmanager. query (query); if (c! = Null & c. moveToFirst () {int status = c. getInt (c. getColumnIndex (DownloadManager. COLUMN_STATUS); int reasonIdx = c. getColumnIndex (DownloadManager. COLUMN_REASON); int titleIdx = c. getColumnIndex (DownloadManager. COLUMN_TITLE); int fileSizeIdx = c. getColumnIndex (DownloadManager. COLUMN_TOTAL_SIZE_BYTES); int bytesDLIdx = c. getColumnIndex (DownloadManager. COLUMN_BYTES_DOWNLOADED_SO_FAR); String title = C. getString (titleIdx); int fileSize = c. getInt (fileSizeIdx); int bytesDL = c. getInt (bytesDLIdx); // Translate the pause reason to friendly text. int reason = c. getInt (reasonIdx); StringBuilder sb = new StringBuilder (); sb. append (title ). append ("\ n"); sb. append ("Downloaded "). append (bytesDL ). append ("/"). append (fileSize); // Display the status Log. d ("tag", sb. toString (); switch (status) {case Dow NloadManager. STATUS_PAUSED: Log. v ("tag", "STATUS_PAUSED"); case DownloadManager. STATUS_PENDING: Log. v ("tag", "STATUS_PENDING"); case DownloadManager. STATUS_RUNNING: // download. v ("tag", "STATUS_RUNNING"); break; case DownloadManager. STATUS_SUCCESSFUL: // complete Log. v ("tag", "download completed"); // dowanloadmanager. remove (lastDownloadId); break; case DownloadManager. STATUS_FAILED: // clear the downloaded content and download the Log again. v ("tag ", "STATUS_FAILED"); dowanloadmanager. remove (lastDownloadId); break ;}}@ Override protected void onDestroy () {// TODO Auto-generated method stub super. onDestroy (); unregisterReceiver (receiver); getContentResolver (). unregisterContentObserver (downloadObserver) ;}} package com. koolsee. gallery; import java. util. arrayList; import java. util. list; import java. util. timer; import java. util. timerTask; import Android. app. activity; import android. app. downloadManager; import android. app. downloadManager. request; import android. content. broadcastReceiver; import android. content. context; import android. content. intent; import android. content. intentFilter; import android. database. contentObserver; import android. database. cursor; import android.net. uri; import android. OS. bundle; import android. OS. environment; import android. OS. handler; import android. util. log; import android. view. keyEvent; import android. view. motionEvent; import android. view. view; import android. view. view. onKeyListener; import android. view. view. onTouchListener; import android. widget. adapterView; import android. widget. adapterView. onItemClickListener; import android. widget. adapterView. onItemSelectedListener; import android. widget. button; import android. widget. im AgeView; import android. widget. textView; import com. koolsee. gallery. adapter. recommendAdapter; import com. koolsee. gallery. model. recommend; import com. koolsee. gallery. widget. galleryFlow;/*** homepage ** @ author zengxiaotao */public class testActivity extends Activity {private DownloadManager dowanloadmanager = null; private DownloadChangeObserver downloadObserver; private long lastDownloadId = 0; public s Tatic final Uri CONTENT_URI = Uri. parse ("content: // downloads/my_downloads"); @ Override protected void onCreate (Bundle savedInstanceState) {// TODO Auto-generated method stub super. onCreate (savedInstanceState); setContentView (R. layout. test); String serviceString = Context. DOWNLOAD_SERVICE; dowanloadmanager = (DownloadManager) getSystemService (DOWNLOAD_SERVICE); Uri uri = Uri. parse ("http: // commonsw Are.com/misc/test.mp4 "); Environment. getExternalStoragePublicDirectory (Environment. DIRECTORY_DOWNLOADS ). mkdir (); lastDownloadId = dowanloadmanager. enqueue (new DownloadManager. request (uri ). setAllowedNetworkTypes (DownloadManager. request. NETWORK_MOBILE | DownloadManager. request. NETWORK_WIFI ). setAllowedOverRoaming (false ). setDestinationInExternalPublicDir (Environment. DIRECTORY_DOWNLOADS, "test. mp 4 "); registerReceiver (receiver, new IntentFilter (DownloadManager. ACTION_DOWNLOAD_COMPLETE); downloadObserver = new DownloadChangeObserver (null); getContentResolver (). response (CONTENT_URI, true, downloadObserver);} class DownloadChangeObserver extends ContentObserver {public DownloadChangeObserver (Handler handler) {super (handler); // TODO Auto-generated constructor stub} @ Overr Ide public void onChange (boolean selfChange) {queryDownloadStatus () ;}} private BroadcastReceiver receiver ER = new BroadcastReceiver () {@ Override public void onReceive (Context context, Intent intent) {// The download id can be obtained here, so that you can know which file has been downloaded. Applicable to the monitoring logs of multiple download tasks. v ("tag", "" + intent. getLongExtra (DownloadManager. EXTRA_DOWNLOAD_ID, 0); queryDownloadStatus () ;}}; private void queryDownloadStatus () {DownloadManager. query query = new DownloadManager. query (); query. setFilterById (lastDownloadId); Cursor c = dowanloadmanager. query (query); if (c! = Null & c. moveToFirst () {int status = c. getInt (c. getColumnIndex (DownloadManager. COLUMN_STATUS); int reasonIdx = c. getColumnIndex (DownloadManager. COLUMN_REASON); int titleIdx = c. getColumnIndex (DownloadManager. COLUMN_TITLE); int fileSizeIdx = c. getColumnIndex (DownloadManager. COLUMN_TOTAL_SIZE_BYTES); int bytesDLIdx = c. getColumnIndex (DownloadManager. COLUMN_BYTES_DOWNLOADED_SO_FAR); String title = c. getString (titleIdx); int fileSize = c. getInt (fileSizeIdx); int bytesDL = c. getInt (bytesDLIdx); // Translate the pause reason to friendly text. int reason = c. getInt (reasonIdx); StringBuilder sb = new StringBuilder (); sb. append (title ). append ("\ n"); sb. append ("Downloaded "). append (bytesDL ). append ("/"). append (fileSize); // Display the status Log. d ("tag", sb. toString (); switch (status) {case DownloadManager. STATUS_PAUSED: Log. v ("tag", "STATUS_PAUSED"); case DownloadManager. STATUS_PENDING: Log. v ("tag", "STATUS_PENDING"); case DownloadManager. STATUS_RUNNING: // download. v ("tag", "STATUS_RUNNING"); break; case DownloadManager. STATUS_SUCCESSFUL: // complete Log. v ("tag", "download completed"); // dowanloadmanager. remove (lastDownloadId); break; case DownloadManager. STATUS_FAILED: // clear the downloaded content and download the Log again. v ("tag", "STATUS_FAILED"); dowanloadmanager. remove (lastDownloadId); break ;}}@ Override protected void onDestroy () {// TODO Auto-generated method stub super. onDestroy (); unregisterReceiver (receiver); getContentResolver (). unregisterContentObserver (downloadObserver );}}