不使用第三方框架编写的多线程断线续传功能

  一、背景
  
  最近需要个断线续传功能,但是觉得一些框架不太适合,所以基于原理编写了一个多线程断线续传功能
  
  支持技术分享,但是复制和转发我的博客时候请标明出处,谢谢 https://my.oschina.net/grkj/blog/2907188
  
  二、断线续传的个人理解:
  
  1、断线续传在个人理解,其实就是在出现正常下载流程之外的事情的时候,保存好当前文件下载的进度,然后点击继续下载的时候,从上次的下载进度继续进行下载。
  
  2、如何从上次下载进度继续进行下载呢? 主要就是设置头部信息进行告知实现的
  
  setRequestProperty("Range", "bytes=" + progress + "-" + total);//设置下载范围
  
  三、主要功能有
  
  1、支持多线程断线续传
  
  2、支持回调事件拓展,使用泛型定义对象,支持更加灵活的去拓展对象
  
  3、如果要下载的资源在要保存的文件夹中存在,那么会自动进行下载位置校准和下载
  
  4、支持自定义资源请求的方式(GET和POST方式)和请求超时时间
  
  5、我编不下了,如果你发现了就帮我写上去,谢谢....... 效果图如下
  
  下载3只是装饰,你可以换个地址和修改一下MainActivity的按钮监控那块的代码,抄下载下载1和下载2的代码即可 下载中 下载完毕
  
  后面我会完善个功能,只要连上网络就进行检查,然后自动进行资源下载,如果有需要可以给我留言
  
  四、直接上源码讲解
  
  篇幅太长,贴不了那么多,只贴8点 代码下载地址为:点击下载 源码里面DownLoadTask构造函数里面有个地方写错了,写死成了GET方式,如果下载源码的要使用,可以复制下面的DownLoadTask源码进去覆盖掉就好了
  
  1、多线程实例,主要的内容都在这里了
  
  //执行下载的线程
  
  public class DownLoadTask implements Runnable {
  
  private static final String TAG = "DownLoadTask";
  
  public static final int CACHE_SIZE = 4 * 1024;//缓冲区间,4应该足够了
  
  public static final int DEFAULT_TIME_OUT = 5000;//单位是毫秒,默认是5秒,支持自定义
  
  //线程安全的资源列表,key是文件名称,value是下载实例
  
  private static ConcurrentHashMap<String, DownLoadEntity> mResourceMap = new ConcurrentHashMap<String, DownLoadEntity>();
  
  /**
  
  * @Description 停止下载
  
  * [@author](https://my.oschina.net/arthor) 姚旭民
  
  * [@date](https://my.oschina.net/u/2504391) 2018/11/20 16:37
  
  */
  
  public static void stop(String key) throws NullPointerException {
  
  try {
  
  if (key == null)
  
  throw new NullPointerException();
  
  mResourceMap.get(key).setStop(true);
  
  } catch (Exception e) {
  
  Log.e(TAG, e.toString());
  
  }
  
  }
  
  /**
  
  * [@param](https://my.oschina.net/u/2303379) key 文件凭证
  
  * @Description 资源删除
  
  * @author 姚旭民
  
  * @date 2018/11/20 17:22
  
  */
  
  public static void remove(String key) throws NullPointerException {
  
  if (key == null || mResourceMap.get(key) == null)
  
  throw new NullPointerException("参数为null或者下载数据不存在");
  
  mResourceMap.get(key).setDelete(true);
  
  }
  
  //下载实体
  
  DownLoadEntity mDownLoadEntity;
  
  //回调对象,只要进行实现,就可以获得各种事件的观察回调,IDownLoadCallBack源码在 第2点 有贴出来
  
  IDownLoadCallBack mCallBack;
  
  //传输方式,是一个枚举类型,支持自定义传输
  
  TransmissionType mType;
  
  //下载的超时时间
  
  int mTimeout;
  
  public DownLoadTask(DownLoadEntity downLoadEntity, IDownLoadCallBack mCallBack) {
  
  this(downLoadEntity, mCallBack, TransmissionType.TYPE_GET);
  
  }
  
  public DownLoadTask(DownLoadEntity downLoadEntity, IDownLoadCallBack mCallBack, TransmissionType type) {
  
  this(downLoadEntity, mCallBack, type, DEFAULT_TIME_OUT);
  
  }
  
  public DownLoadTask(DownLoadEntity downLoadEntity, IDownLoadCallBack mCallBack, TransmissionType type, int timeout) {
  
  this.mDownLoadEntity www.dfgjpt.com= downLoadEntity;
  
  this.mCallBack =www.gcyl152.com/ mCallBack;
  
  this.mType = type;
  
  this.mTimeout www.gcyL157.com= timeout;
  
  //数据存储
  
  mResourceMap.put(downLoadEntity.getKey(), downLoadEntity);
  
  Log.v(TAG, "存放数据进入键值对,key:" + downLoadEntity.getKey() + ",downLoadEntity:" + downLoadEntity);
  
  }
  
  @Override
  
  public void run(www.michenggw.com) {
  
  //下载路径
  
  String downUrl = mDownLoadEntity.getDownUrl();
  
  //保存路径
  
  String savePath = mDownLoadEntity.getSavePath();
  
  //已经下载的进度
  
  long progress = mDownLoadEntity.getProgress();//已经下载好的长度
  
  long total = mDownLoadEntity.getTotal();//文件的总长度
  
  String key = mDownLoadEntity.getKey();
  
  HttpURLConnection connection = null;
  
  //有人可能觉得NIO 的 FileChannel 也可以的话,那么你也可以替换掉
  
  RandomAccessFile randomAccessFile = null;
  
  try {
  
  //设置文件写入位置
  
  File file = new File(savePath);
  
  //父类文件夹是否存在
  
  File fileParent = file.getParentFile();
  
  if (!fileParent.exists(www.mcyllpt.com)) {//如果父类文件夹不存在,即创建文件夹
  
  Log.v(TAG, "父类文件夹:" + fileParent.getPath() + ",不存在,开始创建");
  
  fileParent.mkdirs();
  
  }
  
  if (file != null) {//这一步是针对于断线续传的文件,用于比对数据库和真实的数据,避免出现误差
  
  long fileSize = file.length();
  
  if (progress != fileSize) {//如果文件有问题,以实际下载的文件大小为准
  
  Log.v(TAG, "文件传输节点不一致,开始修复传数据节点");
  
  progress = fileSize;
  
  mDownLoadEntity.setProgress(progress);
  
  }
  
  }
  
  int precent = (int) www.mhylpt.com ((float) progress / (float) total * 100);
  
  //开始下载之前先回调开始下载的进度
  
  mCallBack.onNext(key, precent);
  
  URL url = new URL(downUrl);
  
  connection = (HttpURLConnection) url.openConnection();
  
  //请求方式默认为GET
  
  connection.setRequestMethod(mType.getType());
  
  //超时时间
  
  connection.setConnectTimeout(mTimeout);
  
  //从上次下载完成的地方下载
  
  //设置下载位置(从服务器上取要下载文件的某一段)
  
  connection.setRequestProperty("Range", "bytes=" + progress + "-" + total);//设置下载范围
  
  randomAccessFile = new RandomAccessFile(file, "rwd");
  
  //从文件的某一位置开始写入
  
  randomAccessFile.seek(progress);
  
  if (connection.getResponseCode() == 206) {//文件部分下载,返回码为206
  
  InputStream is = connection.getInputStream();
  
  byte[] buffer = new byte[CACHE_SIZE];
  
  //接收到的资源大小
  
  int len;
  
  while ((len =www.furong157.com is.read(buffer)) != -1) {
  
  //写入文件
  
  randomAccessFile.write(buffer, 0, len);
  
  progress += len;
  
  precent = (int) ((float) progress / (float) total * 100);
  
  //更新进度回调
  
  mCallBack.onNext(key, precent);
  
  //停止下载
  
  if (mDownLoadEntity.isStop()) {
  
  mDownLoadEntity.setProgress(progress);
  
  mCallBack.onPause(mDownLoadEntity, key, precent, progress, total);
  
  return;
  
  }
  
  //取消下载
  
  if (mDownLoadEntity.isDelete()) {
  
  mResourceMap.remove(key);
  
  //文件删除
  
  file.delete();
  
  mCallBack.onDelete(mDownLoadEntity, key);
  
  return;
  
  }
  
  }
  
  }
  
  //资源删除
  
  mResourceMap.remove(mDownLoadEntity.getFileName());
  
  //下载完成
  
  mCallBack.onSuccess(mDownLoadEntity, key);
  
  } catch (Exception e) {
  
  //资源删除
  
  mResourceMap.remove(mDownLoadEntity.getFileName());
  
  mDownLoadEntity.setProgress(progress);
  
  //防止意外
  
  mDownLoadEntity.setStop(false);
  
  //失败原因回调
  
  mCallBack.onFail(mDownLoadEntity, key, e.toString());
  
  StringBuffer sb = new StringBuffer();
  
  Writer writer = new StringWriter();
  
  PrintWriter printWriter = new PrintWriter(writer);
  
  e.printStackTrace(printWriter);
  
  Throwable cause = e.getCause();
  
  while (cause != null) {
  
  cause.printStackTrace(printWriter);
  
  cause = cause.getCause();
  
  }
  
  printWriter.close();
  
  //异常的详细内容
  
  String result = writer.toString();
  
  Log.e(TAG, result);
  
  } finally {
  
  if (connection != null) {
  
  connection.disconnect();
  
  }
  
  try {
  
  if (randomAccessFile != null) {
  
  randomAccessFile.close();
  
  }
  
  } catch (IOException e) {
  
  StringBuffer sb = new StringBuffer();
  
  Writer writer = new StringWriter();
  
  PrintWriter printWriter = new PrintWriter(writer);
  
  e.printStackTrace(printWriter);
  
  Throwable cause = e.getCause();
  
  while (cause != null) {
  
  cause.printStackTrace(printWriter);
  
  cause = cause.getCause();
  
  }
  
  printWriter.close();
  
  //异常的详细内容
  
  String result = writer.toString();
  
  Log.e(TAG, result);
  
  }
  
  }
  
  }
  
  }
  
  2、IDownLoadCallBack源码,这里的泛型主要是因为和公司一些业务有关,这里没有列出来,这里的泛型其实可以去掉的,因为基本这里没什么用的,T 都改成 DownLoadEntity实例即可
  
  public interface IDownLoadCallBack<T> {
  
  /**
  
  * @param key     下载的文件的标识,主要用于显示的时候辨别是哪个文件在操作,由使用的人去定义
  
  * @param precent 已经下载的百分比 取值区间为 [0,100]
  
  * @Description
  
  * @author 姚旭民
  
  * @date 2018/11/20 9:46
  
  */
  
  public abstract void onNext(String key, int precent);
  
  /**
  
  * @param t            下载的文件的实体封装类
  
  * @param key          下载的文件的标识,主要用于显示的时候辨别是哪个文件在操作,由使用的人去定义
  
  * @param precent      已经下载的百分比
  
  * @param downLoadSize 已经下载的长度
  
  * @param total        资源的总长度
  
  * @Description
  
  * @author 姚旭民
  
  * @date 2018/11/20 10:48
  
  */
  
  public abstract void onPause(T t, String key, int precent, long downLoadSize, long total);
  
  /**
  
  * @Description 删除文件回调
  
  * @author 姚旭民
  
  * @date 2018/11/22 10:47
  
  *
  
  * @param t 操作的下载对象
  
  * @param key 文件凭证
  
  */
  
  public abstract void onDelete(T t, String key);
  
  /**
  
  * @param t   自定义的值
  
  * @param key 下载的文件的标识,主要用于显示的时候辨别是哪个文件在操作,由使用的人去定义
  
  * @Description
  
  * @author 姚旭民
  
  * @date 2018/11/20 9:46
  
  */
  
  public abstract void onSuccess(T t, String key);
  
  /**
  
  * @param t      自定义的值
  
  * @param key    下载的文件的标识,主要用于显示的时候辨别是哪个文件在操作,由使用的人去定义
  
  * @param reason 失败原因
  
  * @Description
  
  * @author 姚旭民
  
  * @date 2018/11/20 9:46
  
  */
  
  public abstract void onFail(T t, String key, String reason);
  
  3、IDownLoadCallBack包装类继承,包装类用于包装泛型对象,其实这一步可以不要的,只是有点别的考虑,所以这样写
  
  /**
  
  * @Description 包装类
  
  * @author 姚旭民
  
  * @date 2018/11/20 13:57
  
  */
  
  public interface IResumeCallBack extends IDownLoadCallBack<ResumeEntity> {
  
  }
  
  4、ResumeEntity对象源码主要继承了DownLoadEntity(第5点),其他没什么的
  
  public class ResumeEntity extends DownLoadEntity {
  
  public static enum STATUS {
  
  FAIL(-1),//下载失败
  
  DOWNLOAD(0),//下载中
  
  SUCCESS(1);//下载成功,可以使用
  
  private int value;
  
  private STATUS(int value) {
  
  this.value = value;
  
  }
  
  public int getValue() {
  
  return value;
  
  }
  
  }
  
  ResumeEntity(builder builder) {
  
  this.fileName = builder.fileName;
  
  this.downUrl = builder.downUrl;
  
  this.savePath = builder.savePath;
  
  this.total = builder.total;
  
  this.progress = builder.progress;
  
  this.status = builder.status;
  
  this.key = builder.key;
  
  }
  
  //链式编程,防止对象不一致,用static修饰,避免被保留强引用
  
  public static class builder {
  
  private String fileName;
  
  private String downUrl;
  
  private String savePath;
  
  private long total;
  
  private long progress;
  
  private int status;
  
  private boolean stop;
  
  private String key;
  
  public builder fileName(String fileName) {
  
  this.fileName = fileName;
  
  return this;
  
  }
  
  public builder downUrl(String downUrl) {
  
  this.downUrl = downUrl;
  
  return this;
  
  }
  
  public builder savePath(String savePath) {
  
  this.savePath = savePath;
  
  return this;
  
  }
  
  public builder total(long total) {
  
  this.total = total;
  
  return this;
  
  }
  
  public builder progress(long progress) {
  
  this.progress = progress;
  
  return this;
  
  }
  
  public builder status(int status) {
  
  this.status = status;
  
  return this;
  
  }
  
  public builder stop(boolean stop) {
  
  this.stop = stop;
  
  return this;
  
  }
  
  public builder key(String key) {
  
  this.key = key;
  
  return this;
  
  }
  
  public ResumeEntity builder() {
  
  return new ResumeEntity(this);
  
  }
  
  }
  
  @Override
  
  public String toString() {
  
  return "{" +
  
  "fileName='" + fileName + '\'' +
  
  ", downUrl='" + downUrl + '\'' +
  
  ", savePath='" + savePath + '\'' +
  
  ", total=" + total +
  
  ", progress=" + progress +
  
  ", status=" + status +
  
  ", stop=" + stop +
  
  ", key='" + key + '\'' +
  
  '}';
  
  }
  
  }
  
  5、DownLoadEntity源码区域
  
  public class DownLoadEntity {
  
  //资源文件的名称
  
  protected String fileName;
  
  //资源文件的下载路径
  
  protected String downUrl;
  
  //资源文件的保存完整路径
  
  protected String savePath;
  
  //下载的资源的总长度
  
  protected long total;
  
  //已经下载的进度
  
  protected long progress;
  
  //资源的状态 //下载的状况 1为下载成功,0为可下载, -1为下载失败 默认为0
  
  protected int status;
  
  //是否暂停下载 true为暂停下载, false代表可以下载, 默认为false
  
  protected boolean stop;
  
  //下载的文件的标识,让使用者更加灵活的去定义如何识别正在下载的文件
  
  protected String key;
  
  //是否删除下载的文件
  
  protected boolean delete;
  
  //这里是各种set和get,不花费篇幅粘贴了,直接用工具生成就好了
  
  }
  
  6、IDownLoadCallBack的实现类,我是不想每次都创建一个匿名类了,太长了也繁琐,我直接用activity去实现IDownLoadCallBack,感觉也挺好的,这里是随便写的activity,主要用来测试的,UI界面源码在第7点
  
  public class MainActivity extends AppCompatActivity implements View.OnClickListener, IResumeCallBack, INetCallBack {
  
  private static final String TAG = "MainActivity";
  
  //数据库操作辅助类
  
  private ResumeDbHelper mHelper = ResumeDbHelper.getInstance();
  
  private ResumeService mResumeService = ResumeService.getInstance();
  
  private MainActivity mInstance = this;
  
  private Button downloadBtn1, downloadBtn2, downloadBtn3;
  
  private Button pauseBtn1, pauseBtn2, pauseBtn3;
  
  private Button cancelBtn1, cancelBtn2, cancelBtn3;
  
  private ProgressBar mProgress1, mProgress2, mProgress3;
  
  private String url1 = "http://192.168.1.103/2.bmp";
  
  private String url2 = "http://192.168.1.103/testzip.zip";
  
  private String url3 = "http://192.168.1.103/photo.png";
  
  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
  try {
  
  super.onCreate(savedInstanceState);
  
  setContentView(R.layout.activity_main);
  
  NetReceiver.setCallBack(this);
  
  downloadBtn1 = bindView(R.id.main_btn_down1);
  
  downloadBtn2 = bindView(R.id.main_btn_down2);
  
  downloadBtn3 = bindView(R.id.main_btn_down3);
  
  pauseBtn1 = bindView(R.id.main_btn_pause1);
  
  pauseBtn2 = bindView(R.id.main_btn_pause2);
  
  pauseBtn3 = bindView(R.id.main_btn_pause3);
  
  cancelBtn1 = bindView(R.id.main_btn_cancel1);
  
  cancelBtn2 = bindView(R.id.main_btn_cancel2);
  
  cancelBtn3 = bindView(R.id.main_btn_cancel3);
  
  mProgress1 = bindView(R.id.main_progress1);
  
  mProgress2 = bindView(R.id.main_progress2);
  
  mProgress3 = bindView(R.id.main_progress3);
  
  downloadBtn1.setOnClickListener(this);
  
  downloadBtn2.setOnClickListener(this);
  
  downloadBtn3.setOnClickListener(this);
  
  pauseBtn1.setOnClickListener(this);
  
  pauseBtn2.setOnClickListener(this);
  
  pauseBtn3.setOnClickListener(this);
  
  cancelBtn1.setOnClickListener(this);
  
  cancelBtn2.setOnClickListener(this);
  
  cancelBtn3.setOnClickListener(this);
  
  } catch (Exception e) {
  
  Log.e(TAG, e.toString());
  
  }
  
  }
  
  @Override
  
  public void onClick(View v) {
  
  try {
  
  switch (v.getId()) {
  
  case R.id.main_btn_down1:
  
  Log.d(TAG, "点击了下载1,url1:" + url1);
  
  ThreadUtils.exeMgThread3(new Runnable() {
  
  @Override
  
  public void run() {
  
  mResumeService.download("1", url1, FileConts.IMG_PATH, mInstance);
  
  }
  
  });
  
  break;
  
  case R.id.main_btn_down2:
  
  Log.d(TAG, "点击了下载2");
  
  ThreadUtils.exeMgThread3(new Runnable() {
  
  @Override
  
  public void run() {
  
  mResumeService.download("2", url2, FileConts.IMG_PATH, mInstance);
  
  }
  
  });
  
  break;
  
  case R.id.main_btn_down3:
  
  Log.d(TAG, "点击了下载3");
  
  break;
  
  case R.id.main_btn_pause1:
  
  ThreadUtils.exeMgThread3(new Runnable() {
  
  @Override
  
  public void run() {
  
  Log.v(TAG, "点击暂停1");
  
  ResumeService.getInstance().stop("1");
  
  }
  
  });
  
  break;
  
  case R.id.main_btn_pause2:
  
  ThreadUtils.exeMgThread3(new Runnable() {
  
  @Override
  
  public void run() {
  
  Log.v(TAG, "点击暂停2");
  
  ResumeService.getInstance().stop("2");
  
  }
  
  });
  
  break;
  
  case R.id.main_btn_pause3:
  
  //                ResumeService.getInstance().cancel(url3);
  
  break;
  
  case R.id.main_btn_cancel1:
  
  ThreadUtils.exeMgThread3(new Runnable() {
  
  @Override
  
  public void run() {
  
  ResumeService.getInstance().remove(url1, "1");
  
  }
  
  });
  
  break;
  
  case R.id.main_btn_cancel2:
  
  ThreadUtils.exeMgThread3(new Runnable() {
  
  @Override
  
  public void run() {
  
  ResumeService.getInstance().remove(url2, "2");
  
  }
  
  });
  
  break;
  
  case R.id.main_btn_cancel3:
  
  //                ResumeService.getInstance().cancel(url3);
  
  break;
  
  }
  
  } catch (Exception e) {
  
  StringBuffer sb = new StringBuffer();
  
  Writer writer = new StringWriter();
  
  PrintWriter printWriter = new PrintWriter(writer);
  
  e.printStackTrace(printWriter);
  
  Throwable cause = e.getCause();
  
  while (cause != null) {
  
  cause.printStackTrace(printWriter);
  
  cause = cause.getCause();
  
  }
  
  printWriter.close();
  
  //异常的详细内容
  
  String result = writer.toString();
  
  Log.e(TAG, result);
  
  }
  
  }
  
  private <T extends View> T bindView(@IdRes int id) {
  
  View viewById = findViewById(id);
  
  return (T) viewById;
  
  }
  
  @Override
  
  protected void onDestroy() {
  
  super.onDestroy();
  
  Log.v(TAG, "onDestroy");
  
  }
  
  //IDownLoadCallBack 接口 的各种回调 事件 开始
  
  //下载的进度回调
  
  @Override
  
  public void onNext(String key, int precent) {
  
  if ("1".equals(key)) {
  
  mProgress1.setMax(100);
  
  mProgress1.setProgress(precent);
  
  } else if ("2".equals(key)) {
  
  mProgress2.setMax(100);
  
  mProgress2.setProgress(precent);
  
  }
  
  }
  
  //下载的停止回调,同时会将暂停状态保存进入数据库
  
  @Override
  
  public void onPause(ResumeEntity resumeEntity, String key, int precent, long downLoadSize, long total) {
  
  Log.v(TAG, "onNext| 下载 暂停 回调方法,resumeEntity:" + resumeEntity);
  
  mHelper.update(resumeEntity);
  
  }
  
  //删除文件回调
  
  @Override
  
  public void onDelete(ResumeEntity resumeEntity, String key) {
  
  Log.v(TAG, "onDelete| 下载 删除 回调方法,resumeEntity:" + resumeEntity);
  
  mHelper.delete(resumeEntity.getFileName());
  
  }
  
  //下载成功的回调
  
  @Override
  
  public void onSuccess(ResumeEntity resumeEntity, String key) {
  
  Log.v(TAG, "onNext| 下载 成功 回调方法,resumeEntity:" + resumeEntity);
  
  resumeEntity.setStatus(ResumeEntity.STATUS.SUCCESS.getValue());
  
  mHelper.update(resumeEntity);
  
  }
  
  //下载失败的回调
  
  @Override
  
  public void onFail(ResumeEntity resumeEntity, String key, String reason) {
  
  Log.v(TAG, "onFail| 下载 失败 回调方法,resumeEntity:" + resumeEntity + ",reason:" + reason);
  
  resumeEntity.setStatus(ResumeEntity.STATUS.FAIL.getValue());
  
  mHelper.update(resumeEntity);
  
  }
  
  //IDownLoadCallBack 接口 的各种回调 事件 结束
  
  //网络状态回调区域,这里是我用来接着编写网络重连之后继续下载的东西的
  
  public void onStatusChange(String msg) {
  
  Log.v(TAG, "onStatusChange| 网络状态回调,内容为:" + msg);
  
  }
  
  }
  
  7、UI界面
  
  <?xml version="1.0" encoding="utf-8"?>
  
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  
  xmlns:tools="http://schemas.android.com/tools"
  
  android:id="@+id/activity_main"
  
  android:layout_width="match_parent"
  
  android:layout_height="match_parent"
  
  android:orientation="vertical"
  
  tools:context="com.yxm.resume.activity.MainActivity">
  
  <LinearLayout
  
  android:layout_width="match_parent"
  
  android:layout_height="wrap_content"
  
  android:orientation="horizontal">
  
  <ProgressBar
  
  android:id="@+id/main_progress1"
  
  style="@style/Widget.AppCompat.ProgressBar.Horizontal"
  
  android:layout_width="0dp"
  
  android:layout_height="match_parent"
  
  android:layout_weight="1"
  
  android:progressDrawable="@drawable/progressbar" /> 进度条样式在第8点
  
  <Button
  
  android:id="@+id/main_btn_down1"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="下载1" />
  
  <Button
  
  android:id="@+id/main_btn_pause1"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="暂停1" />
  
  <Button
  
  android:id="@+id/main_btn_cancel1"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="取消1" />
  
  </LinearLayout>
  
  <LinearLayout
  
  android:layout_width="match_parent"
  
  android:layout_height="wrap_content"
  
  android:orientation="horizontal">
  
  <ProgressBar
  
  android:id="@+id/main_progress2"
  
  style="@style/Widget.AppCompat.ProgressBar.Horizontal"
  
  android:layout_width="0dp"
  
  android:layout_height="match_parent"
  
  android:layout_weight="1" />
  
  <Button
  
  android:id="@+id/main_btn_down2"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="下载2" />
  
  <Button
  
  android:id="@+id/main_btn_pause2"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="暂停2" />
  
  <Button
  
  android:id="@+id/main_btn_cancel2"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="取消2" />
  
  </LinearLayout>
  
  <LinearLayout
  
  android:layout_width="match_parent"
  
  android:layout_height="wrap_content"
  
  android:orientation="horizontal">
  
  <ProgressBar
  
  android:id="@+id/main_progress3"
  
  style="@style/Widget.AppCompat.ProgressBar.Horizontal"
  
  android:layout_width="0dp"
  
  android:layout_height="match_parent"
  
  android:layout_weight="1" />
  
  <Button
  
  android:id="@+id/main_btn_down3"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="下载3" />
  
  <Button
  
  android:id="@+id/main_btn_pause3"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="暂停3" />
  
  <Button
  
  android:id="@+id/main_btn_cancel3"
  
  android:layout_width="wrap_content"
  
  android:layout_height="wrap_content"
  
  android:text="取消3" />
  
  </LinearLayout>
  
  </LinearLayout>
  
  8、进度条样式
  
  <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
  
  <item android:id="@android:id/background">
  
  <shape>
  
  <corners android:radius="5dip" />
  
  <gradient
  
  android:angle="0"
  
  android:centerColor="#ff5a5d5a"
  
  android:centerY="0.75"
  
  android:endColor="#ff747674"
  
  android:startColor="#ff9d9e9d" />
  
  </shape>
  
  </item>
  
  <item android:id="@android:id/secondaryProgress">
  
  <clip>
  
  <shape>
  
  <corners android:radius="5dip" />
  
  <gradient
  
  android:angle="0"
  
  android:centerColor="#80ffb600"
  
  android:centerY="0.75"
  
  android:endColor="#a0ffcb00"
  
  android:startColor="#80ffd300" />
  
  </shape>
  
  </clip>
  
  </item>
  
  <item android:id="@android:id/progress">
  
  <clip>
  
  <shape>
  
  <corners android:radius="5dip" />
  
  <gradient
  
  android:angle="0"
  
  android:endColor="#8000ff00"
  
  android:startColor="#80ff0000" />
  
  </shape>
  
  </clip>
  
  </item>
  
  </layer-list>

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转载自blog.csdn.net/li123128/article/details/84502301