Android 使用 DowanloadManager 实现下载并获取下载进度实例代码
Android 使用 DowanloadManager 实现下载并获取下载进度实例代码
实现代码:
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.ImageView; import android.widget.TextView; import com.koolsee.gallery.adapter.RecommendAdapter; import com.koolsee.gallery.model.Recommend; import com.koolsee.gallery.widget.GalleryFlow; /** * 首页 * * @author zengxiaotao */ public class testActivity 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.Request.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); } class DownloadChangeObserver extends ContentObserver { public DownloadChangeObserver(Handler handler) { super(handler); // TODO Auto-generated constructor stub } @Override public void onChange(boolean selfChange) { queryDownloadStatus(); } } private BroadcastReceiver receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { //这里可以取得下载的id,这样就可以知道哪个文件下载完成了。适用与多个下载任务的监听 Log.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: // 正在下载,不做任何事情 Log.v("tag", "STATUS_RUNNING"); break; case DownloadManager.STATUS_SUCCESSFUL: // 完成 Log.v("tag", "下载完成"); // dowanloadmanager.remove(lastDownloadId); break; case DownloadManager.STATUS_FAILED: // 清除已下载的内容,重新下载 Log.v("tag", "STATUS_FAILED"); dowanloadmanager.remove(lastDownloadId); break; } } } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); unregisterReceiver(receiver); getContentResolver().unregisterContentObserver(downloadObserver); } }
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