package com.anyun.exam.lib;
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import android.app.DownloadManager;
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import android.bluetooth.BluetoothDevice;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.Environment;
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import android.util.Log;
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import java.io.File;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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public class DownloadManagerUtil {
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public static final String TAG = DownloadManagerUtil.class.getCanonicalName();
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private Context context;
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private DownloadManager downloadManager = null;
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private static DownloadManagerUtil instance = null;
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private DownloadManagerCallback callback = null;
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class DownloadItem {
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long id;
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String fileName;
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String url;
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public DownloadItem (long id, String fileName, String url) {
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this.id = id;
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this.fileName = fileName;
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this.url = url;
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}
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}
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public static DownloadManagerUtil getInstance(Context context) {
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if (instance == null) {
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synchronized (DownloadManagerUtil.class) {
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if (instance == null) {
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instance = new DownloadManagerUtil(context);
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}
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}
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}
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return instance;
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}
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private DownloadManagerUtil(Context context) {
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this.context = context;
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if (downloadManager == null) {
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downloadManager = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
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}
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RegisterDownload();
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}
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public void RegisterDownload() {
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IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
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context.registerReceiver(mReceiver, filter);
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}
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public void SetDMCallback(final DownloadManagerCallback cb) {
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callback = cb;
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}
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private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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String action = intent.getAction();
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if (action.equals(DownloadManager.ACTION_DOWNLOAD_COMPLETE)) {
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long id = intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, -1);
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DownloadManager.Query query = new DownloadManager.Query();
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Cursor cursor = downloadManager.query(query);
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while (cursor != null && cursor.moveToFirst()) {
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int cid = cursor.getInt( cursor.getColumnIndex(DownloadManager.COLUMN_ID) );
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int status = cursor.getInt( cursor.getColumnIndex(DownloadManager.COLUMN_STATUS) );
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if (id == cid && status == DownloadManager.STATUS_SUCCESSFUL) {
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String title = cursor.getString( cursor.getColumnIndex(DownloadManager.COLUMN_TITLE) );
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String fileUri = cursor.getString(cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_LOCAL_URI));
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Log.d(TAG, "下载完毕 " + fileUri);
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if (callback != null) {
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callback.DownloadComplete(title, Uri.parse(fileUri).getPath());
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}
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break;
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}
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}
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}
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}
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};
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public void DownloadFile(String url, String saveFileName, String title, String desc) {
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Log.d(TAG, "下载文件 " + url);
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// 跳过已经在下载的
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if (CheckAndClear(title) == 1) {
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Log.d(TAG, "跳过已经在下载的 " + title);
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return;
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}
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DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
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File file = new File(context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), saveFileName);
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request.setDestinationUri(Uri.fromFile(file));
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request.setTitle(title);
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request.setDescription(desc);
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if (downloadManager != null) {
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long idx = downloadManager.enqueue(request);
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Log.d(TAG, "新建下载任务 id = " + idx);
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}
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}
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public int CheckAndClear(String title) {
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DownloadManager.Query query = new DownloadManager.Query();
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Cursor cursor = downloadManager.query(query);
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while (cursor != null && cursor.moveToNext()) {
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String theTitle = cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_TITLE));
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if (theTitle.equals(title)) {
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int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
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long id = cursor.getLong(cursor.getColumnIndex(DownloadManager.COLUMN_ID));
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Log.d(TAG, "当前该文件下载状态 " + status);
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if (status == DownloadManager.STATUS_FAILED || status == DownloadManager.STATUS_SUCCESSFUL) {
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downloadManager.remove(id);
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return 0;
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} else if (status != DownloadManager.STATUS_RUNNING) {
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// 如果是多次处于暂停\挂起状态，还是删除
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downloadManager.remove(id);
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return 0;
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}
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return 1;
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}
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}
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return 0;
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}
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public int CheckDownloadStatus(int id) {
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DownloadManager.Query query = new DownloadManager.Query();
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Cursor cursor = downloadManager.query(query);
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while (cursor != null && cursor.moveToNext()) {
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int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
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if (id == cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_ID))) {
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return status;
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}
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}
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return -1;
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}
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}
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