Java tutorial
/* * Copyright (C) 2013 Snowdream Mobile <yanghui1986527@gmail.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.github.snowdream.android.app.downloader; import android.content.Context; import android.text.TextUtils; import android.webkit.URLUtil; import com.j256.ormlite.field.DatabaseField; import com.j256.ormlite.table.DatabaseTable; import org.apache.commons.lang3.builder.ToStringBuilder; /** * The download task * * @author snowdream <yanghui1986527@gmail.com> * @version v1.0 * @date Sep 29, 2013 */ @DatabaseTable(tableName = "downloadtask") public class DownloadTask extends Object { @DatabaseField(persisted = false) private Context context = null; /** * the time of finish downloading */ @DatabaseField private long finishTime = 0; /** * id */ @DatabaseField(generatedId = true, canBeNull = false) private int id = 0; @DatabaseField(persisted = false) private DownloadListener listener = null; /** * mimetype */ @DatabaseField private String mimeType = ""; /** * name */ @DatabaseField private String name = ""; /** * the save path on the sdcard */ @DatabaseField(canBeNull = false) private String path = ""; /** * total size */ @DatabaseField private long size = 0; /** * the time of start downloading */ @DatabaseField private long startTime = 0; /** * download status */ @DatabaseField private int status = DownloadStatus.STATUS_PENDING; @DatabaseField(persisted = false) private AsycDownloadTask task = null; /** * type */ @DatabaseField private int type = DownloadType.TYPE_UNKNOWN; /** * url */ @DatabaseField(canBeNull = false) private String url = ""; @SuppressWarnings("unused") private DownloadTask() { } public DownloadTask(Context context) { super(); this.context = context; } public DownloadTask(DownloadTask task) { if (task == null) return; this.context = task.context; this.startTime = task.startTime; this.finishTime = task.finishTime; this.id = task.id; this.mimeType = task.mimeType; this.name = task.name; this.path = task.path; this.size = task.size; this.status = task.status; this.type = task.type; this.url = task.url; this.task = task.task; this.listener = task.listener; } @Override public boolean equals(Object obj) { return super.equals(obj); } @Override public int hashCode() { return url.hashCode(); } @Override public String toString() { return ToStringBuilder.reflectionToString(this); } public Context getContext() { return context; } public void setContext(Context context) { this.context = context; } public long getFinishTime() { return finishTime; } public void setFinishTime(long finishTime) { this.finishTime = finishTime; } public int getId() { return id; } public void setId(int id) { this.id = id; } public DownloadListener getListener() { return listener; } public void setListener(DownloadListener listener) { this.listener = listener; } public String getMimeType() { return mimeType; } public void setMimeType(String mimeType) { this.mimeType = mimeType; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPath() { return path; } public void setPath(String path) { this.path = path; } public long getSize() { return size; } public void setSize(long size) { this.size = size; } public long getStartTime() { return startTime; } public void setStartTime(long startTime) { this.startTime = startTime; } public int getStatus() { return status; } public void setStatus(int status) { this.status = status; } public int getType() { return type; } public void setType(int type) { this.type = type; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } /** * url, name and path is not empty. * * @return true is valid,otherwise not. */ public boolean isComplete() { return !TextUtils.isEmpty(url) && !TextUtils.isEmpty(name) && !TextUtils.isEmpty(path); } /** * Check whether the Task is valid. * * @return true is valid,otherwise not. */ public boolean isValid() { return URLUtil.isNetworkUrl(url); } protected void setDownloadTask(DownloadTask task) { //this.context = task.context; this.startTime = task.startTime; //this.finishTime = task.finishTime; this.id = task.id; if (TextUtils.isEmpty(this.mimeType)) { this.mimeType = task.mimeType; } if (TextUtils.isEmpty(this.name)) { this.name = task.name; } if (TextUtils.isEmpty(this.path)) { this.path = task.path; } this.size = task.size; this.status = task.status; this.type = task.type; this.url = task.url; //this.task = task.task; //this.listener = task.listener; } /** * Start the Task * * @param context Context * @param listener DownloadListener */ @SuppressWarnings({ "rawtypes", "unchecked" }) protected void start(Context context, DownloadListener listener, boolean isOnlyGetHead) { //Get context,which will be used to communicate with sqlite. if (this.context == null && context != null) { this.context = context; } if (task != null) { task.cancel(false); } task = new AsycDownloadTask(listener, isOnlyGetHead); task.execute(this); } /** * Stop the task */ protected void stop() { setStatus(DownloadStatus.STATUS_STOPPED); if (task != null) { task.cancel(false); } } /** * Delete the task */ protected void delete() { setStatus(DownloadStatus.STATUS_DELETED); if (task != null) { task.cancel(false); } } }