使用系统下载管理类DownloadManager

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import java.io.File;import java.util.HashMap;import android.annotation.TargetApi;import android.app.DownloadManager;import android.app.DownloadManager.Query;import android.app.DownloadManager.Request;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.database.Cursor;import android.net.Uri;import android.os.Build;import android.text.TextUtils;import android.webkit.MimeTypeMap;import android.widget.Toast;/** * @Description: 调用系统下载管理类（api>=9） * @time: 2014-4-25 下午5:16:17 * @version: 1.0 */public class DownloadManagerCtrl {    private static DownloadManagerCtrl mInstance;    private DownloadManager dm;    private Context mContext;    private DownloadReceiver mReceiver;    private HashMap<String, Long> downloadQueues = new HashMap<String, Long>();    private DownloadManagerCtrl(Context context) {        mContext = context;        mReceiver = new DownloadReceiver();        dm = (DownloadManager)context.getSystemService( Context.DOWNLOAD_SERVICE);    }    public static synchronized DownloadManagerCtrl getInstance(Context context) {        if(null == mInstance) {            mInstance = new DownloadManagerCtrl( context);        }        return mInstance;    }    @TargetApi(Build.VERSION_CODES.HONEYCOMB)    private void addToDownload(String url) {        Uri uri = Uri.parse( url);        Request request = new Request( uri);        // 设置可下载网络类型        request.setAllowedNetworkTypes( Request.NETWORK_MOBILE | Request.NETWORK_WIFI);        // 不允许漫游        request.setAllowedOverRoaming( false);        // 设置文件类型        MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();        String mimeString = mimeTypeMap.getMimeTypeFromExtension( MimeTypeMap.getFileExtensionFromUrl( url));        request.setMimeType( mimeString);        // 在通知栏中显示        request.setVisibleInDownloadsUi( true);        request.setDescription( mContext.getResources().getString( R.string.app_download_description));        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {            request.setNotificationVisibility( Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);        }        else {               request.setShowRunningNotification( true);        }        // 下载路径        String fileName = url.substring( url.lastIndexOf( '/') + 1);        int i = fileName.indexOf( '?');        if(i != -1) {            fileName = fileName.substring( 0, i);        }        String dirType = FileUtil.getDownlaodPath( mContext);        request.setDestinationInExternalPublicDir( dirType, fileName);        long downloadId = dm.enqueue( request);// 加入下载队列        downloadQueues.put( url, downloadId);    }    public DownloadReceiver getReceiver() {        return mReceiver;    }    public void startDownload(String url) {        if(TextUtils.isEmpty( url)) {            return;        }        Long downloadId = downloadQueues.get( url);        if(null == downloadId) {            addToDownload( url);        }        else {            checkDownloadStatus( downloadId.longValue(), url);        }    }    @TargetApi(Build.VERSION_CODES.HONEYCOMB)    private void checkDownloadStatus(long downloadId, String url) {        Query query = new Query();        query.setFilterById( downloadId);        Cursor c = dm.query( query);        if(c.moveToFirst()) {            int columnIndex = c.getColumnIndex( DownloadManager.COLUMN_STATUS);            int status = c.getInt( columnIndex);            System.out.println( " status " + status);            switch(status) {                case DownloadManager.STATUS_SUCCESSFUL:                    // 已下载完成，若再次点击就进入安装界面                    boolean installOk = false;                    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {                        installOk = startInstall( dm.getUriForDownloadedFile( downloadId));                    }                    else {                        String downloadFileUrl = c.getString( c.getColumnIndex( DownloadManager.COLUMN_LOCAL_URI));                        installOk = startInstall( Uri.parse( downloadFileUrl));                    }                    if(!installOk) {                        addToDownload( url);                    }                    break;                case DownloadManager.STATUS_PAUSED:                case DownloadManager.STATUS_PENDING:                case DownloadManager.STATUS_RUNNING:                    // 暂定、挂起、下载中；提示已加入下载队列                    Toast.makeText( mContext, "已加入下载队列", Toast.LENGTH_LONG).show();                    break;                case DownloadManager.STATUS_FAILED:                    // 下载失败，重新下载                    addToDownload( url);                    break;                default:                    break;            }        }        else {            // 本地文件已被删除，重新下载            addToDownload( url);        }        if(null != c) {            c.close();        }    }    private class DownloadReceiver extends BroadcastReceiver {        @TargetApi(Build.VERSION_CODES.HONEYCOMB)        @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( downloadId);                Cursor c = dm.query( query);                if(c.moveToFirst()) {                    int columnIndex = c.getColumnIndex( DownloadManager.COLUMN_STATUS);                    if(DownloadManager.STATUS_SUCCESSFUL == c.getInt( columnIndex)) {                        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {                            startInstall( dm.getUriForDownloadedFile( downloadId));                        }                        else {                            String downloadFileUrl = c.getString( c.getColumnIndex( DownloadManager.COLUMN_LOCAL_URI));                            startInstall( Uri.parse( downloadFileUrl));                        }                        c.close();                    }                }            }        }    }    private boolean startInstall(Uri uri) {        if(!new File( uri.getPath()).exists()) {            System.out.println( " local file has been deleted! ");            return false;        }        Intent intent = new Intent();        intent.addFlags( Intent.FLAG_ACTIVITY_NEW_TASK);        intent.setAction( Intent.ACTION_VIEW);        intent.setDataAndType( uri, "application/vnd.android.package-archive");        mContext.startActivity( intent);        return true;    }}
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