本文实例为大家分享了Android下载进度监听和通知的具体代码，供大家参考，具体内容如下
下载管理器
关于下载进度的监听,这个比较简单,以apk文件下载为例,需要处理3个回调函数,分别是:
1.下载中
2.下载成功
3.下载失败
因此对应的回调接口就有了:
public interface DownloadCallback {
/**
* 下载成功
* @param file 目标文件
*/
void onComplete(File file);
/**
* 下载失败
* @param e
*/
void onError(Exception e);
/**
* 下载中
* @param count 总大小
* @param current 当前下载的进度
*/
void onLoading(long count, long current);
}
接下来就是线程池的管理了,当然你也可以直接使用Executors工具类中提供的几个静态方法来创建线程池,这里我是手动创建线程池的,代码如下:
public class ThreadManager {
private static ThreadPool mThreadPool;
/**
* 获取线程池
*
* @return
*/
public static ThreadPool getThreadPool() {
if (null == mThreadPool) {
synchronized (ThreadManager.class) {
if (null == mThreadPool) {
// cpu个数
int cpuNum = Runtime.getRuntime().availableProcessors();
//线程个数
int count = cpuNum * 2 + 1;
mThreadPool = new ThreadPool(count, count, 0);
}
}
}
return mThreadPool;
}
public static class ThreadPool {
int corePoolSize;// 核心线程数
int maximumPoolSize;// 最大线程数
long keepAliveTime;// 保持活跃时间(休息时间)
private ThreadPoolExecutor executor;
/**
* 构造方法初始化
*
* @param corePoolSize
* @param maximumPoolSize
* @param keepAliveTime
*/
private ThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime) {
this.corePoolSize = corePoolSize;
this.maximumPoolSize = maximumPoolSize;
this.keepAliveTime = keepAliveTime;
}
private static final ThreadFactory sThreadFactory = new ThreadFactory() {
private final AtomicInteger mCount = new AtomicInteger(1);
public Thread newThread(Runnable r) {
return new Thread(r, "ThreadManager #" + mCount.getAndIncrement());
}
};
/**
* 执行线程任务
*
* @param r
*/
public void execute(Runnable r) {
//参1:核心线程数;参2:最大线程数;参3:保持活跃时间(休息时间);参4:活跃时间单位;参5:线程队列;参6:线程工厂;参7:异常处理策略
if (null == executor) {
executor = new ThreadPoolExecutor(corePoolSize,
maximumPoolSize,
keepAliveTime,
TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(),
sThreadFactory/*Executors.defaultThreadFactory()*/,
new ThreadPoolExecutor.AbortPolicy());
}
// 将当前Runnable对象放在线程池中执行
executor.execute(r);
}
/**
* 从线程池的任务队列中移除一个任务
* 如果当前任务已经是运行状态了,那么就表示不在任务队列中了,也就移除失败.
*/
public void cancle(Runnable r) {
if (null != executor && null != r) {
executor.getQueue().remove(r);
}
}
/**
* 是否关闭了线程池
* @return
*/
public boolean isShutdown(){
return executor.isShutdown();
}
/**
* 关闭线程池
*/
public void shutdown() {
executor.shutdown();
}
}
}
接下来就是一个下载管理器的封装了.
public class DownloadManager {
private DownloadCallback callback;
private Context context;
private String url;
private String fileName;
/**
* 初始化
* @param context 上下文
* @param url 目标文件url
* @param fileName 下载保存的文件名
* @param callback 下载回调函数
*/
public DownloadManager(final Context context, final String url, final String fileName, DownloadCallback callback) {
this.context = context;
this.url = url;
this.fileName = fileName;
this.callback = callback;
}
/**
* 开始下载
*/
public void startDownload() {
if (null == callback) return;
ThreadManager.getThreadPool().execute(new Runnable() {
@Override
public void run() {
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) new URL(url).openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(5000);
conn.setConnectTimeout(10000);
long total = conn.getContentLength();
long curr = 0;
File file = new File(PathUtils.getDirectory(context, "apk"), fileName);
if (!file.exists()) {
file.createNewFile();
} else {
file.delete();
}
FileOutputStream fos = new FileOutputStream(file);
if (200 == conn.getResponseCode()) {
InputStream in = conn.getInputStream();
byte[] buff = new byte[1024];
int len = 0;
while ((len = in.read(buff)) != -1) {
fos.write(buff, 0, len);
curr += len;
callback.onLoading(total, curr);
}
in.close();
fos.close();
if (curr == total) {
callback.onComplete(file);
} else {
throw new Exception("curr != total");
}
} else {
throw new Exception("" + conn.getResponseCode());
}
} catch (Exception e) {
e.printStackTrace();
callback.onError(e);
} finally {
if (null != conn) {
conn.disconnect();
}
}
}
});
}
}
涉及的工具类如下:
PathUtils
public class PathUtils {
/**
* 获取cache目录下的rootDir目录
*
* @param context
* @param rootDir
* @return
*/
public static File getDirectory(Context context, String rootDir) {
String cachePath = context.getApplicationContext().getCacheDir().getAbsolutePath();
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())
|| !Environment.isExternalStorageRemovable()) {
if (Build.VERSION.SDK_INT <= 8) {
cachePath = Environment.getExternalStorageDirectory().getAbsolutePath();
} else if (context.getApplicationContext().getExternalCacheDir() != null) {
cachePath = context.getApplicationContext().getExternalCacheDir().getAbsolutePath();
}
}
File rootF = new File(cachePath + File.separator + rootDir);
if (!rootF.exists()) {
rootF.mkdirs();
}
//修改目录权限可读可写可执行
String cmd = "chmod 777 -R " + rootF.getPath();
CmdUtils.execCmd(cmd);
return rootF;
}
}
CmdUtils
public class CmdUtils {
public static void execCmd(String cmd) {
try {
Runtime.getRuntime().exec(cmd);
} catch (IOException e) {
e.printStackTrace();
}
}
}
下载通知服务
同样以apk下载为例,要实现下载通知服务的话,就用到了Notification和Service,Notification用来通知下载进度并显示给用户看,Service用于后台默默的下载文件,这里我用到了IntentService,它的好处在于任务执行完毕后会自动关闭服务.同时程序用如果其他地方还想监听到下载的进度,那么可以在IntentService下载服务中通过发送广播告知进度.
ok,下面的代码可以直接用户实现apk的升级更新的操作.
public class UpdateService extends IntentService {
private File apkFile;
private String url;
private String fileName;
private NotificationCompat.Builder builderNotification;
private NotificationManager updateNotificationManager;
private int appNameID;
private int iconID;
private PendingIntent updatePendingIntent;
private boolean isUpdating;
public static final String ACTION_UPDATE_PROGRESS = "blog.csdn.net.mchenys.mobilesafe.ACTION_UPDATE_PROGRESS";
private Handler updateHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
UpdateService.this.onFailNotification();
break;
case 1:
UpdateService.this.downComplete();
break;
}
super.handleMessage(msg);
}
};
public UpdateService() {
super("UpdateService");
}
/**
* 开始更新
*
* @param context
* @param url 更新的url
* @param fileName 下载保存apk的文件名称
*/
public static void startUpdate(Context context, String url, String fileName) {
Intent intent = new Intent(context, UpdateService.class);
intent.putExtra("url", url);
intent.putExtra("fileName", fileName);
context.startService(intent);
}
@Override
protected void onHandleIntent(Intent intent) {
//WorkerThread
if (!this.isUpdating && intent != null) {
initData(intent);
initNotification();
downloadFile(true);
}
}
/**
* 初始数据
*
* @param intent
*/
private void initData(Intent intent) {
this.isUpdating = true;
this.url = intent.getStringExtra("url");
this.fileName = intent.getStringExtra("fileName");
this.apkFile = new File(PathUtils.getDirectory(getApplicationContext(), "mobilesafe"), fileName);
if (!this.apkFile.exists()) {
try {
this.apkFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
} else {
this.apkFile.delete();
}
this.appNameID = R.string.app_name;
this.iconID = R.mipmap.ic_logo;
}
/**
* 初始化通知
*/
private void initNotification() {
Intent updateCompletingIntent = new Intent();
updateCompletingIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
updateCompletingIntent.setClass(this.getApplication().getApplicationContext(), UpdateService.class);
this.updatePendingIntent = PendingIntent.getActivity(this, this.appNameID, updateCompletingIntent, PendingIntent.FLAG_CANCEL_CURRENT);
this.updateNotificationManager = (NotificationManager) this.getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
this.builderNotification = new NotificationCompat.Builder(this.getApplicationContext());
this.builderNotification.setSmallIcon(this.iconID).
setContentTitle(this.getResources().getString(this.appNameID)).
setContentIntent(updatePendingIntent).
setAutoCancel(true).
setTicker("开始更新").
setDefaults(1).
setProgress(100, 0, false).
setContentText("下载进度").
build();
this.updateNotificationManager.notify(this.iconID, this.builderNotification.build());
}
/**
* 开始下载apk
*
* @param append 是否支持断点续传
*/
private void downloadFile(final boolean append) {
final Message message = updateHandler.obtainMessage();
int currentSize = 0; //上次下载的大小
long readSize = 0L;//已下载的总大小
long contentLength = 0;//服务器返回的数据长度
if (append) {
FileInputStream fis = null;
try {
fis = new FileInputStream(UpdateService.this.apkFile);
currentSize = fis.available();//获取上次下载的大小,断点续传可用
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
HttpURLConnection conn = null;
InputStream is = null;
FileOutputStream fos = null;
try {
conn = (HttpURLConnection) new URL(UpdateService.this.url).openConnection();
conn.setRequestProperty("User-Agent", "Android");
if (currentSize > 0) {
conn.setRequestProperty("RANGE", "bytes=" + currentSize + "-");
}
conn.setConnectTimeout(10000);
conn.setReadTimeout(20000);
contentLength = conn.getContentLength();
if (conn.getResponseCode() == 404) {
throw new Exception("Cannot find remote file:" + UpdateService.this.url);
}
is = conn.getInputStream();
fos = new FileOutputStream(UpdateService.this.apkFile, append);
//实时更新通知
UpdateService.this.builderNotification.setSmallIcon(iconID).
setContentTitle(UpdateService.this.getResources().getString(UpdateService.this.appNameID)).
setContentIntent(updatePendingIntent).
setAutoCancel(true).
setTicker("正在更新").
setDefaults(0).
setContentText("下载进度").
build();
byte[] buffer = new byte[8*1024];
int len = 0;
while ((len = is.read(buffer)) != -1) {
fos.write(buffer, 0, len);
readSize += len;//累加已下载的大小
int progress = (int) (readSize * 100 / contentLength);
Log.d("UpdateService", (readSize * 100 / contentLength)+"");
if (progress % 8 == 0) {
UpdateService.this.builderNotification.setProgress(100, progress, false);
UpdateService.this.updateNotificationManager.notify(iconID, UpdateService.this.builderNotification.build());
//发送广播,通知外界下载进度
sendUpdateProgress(progress);
}
}
if (readSize == 0L) {
message.what = 0;
} else if (readSize == contentLength) {
message.what = 1;
sendUpdateProgress(100);
}
} catch (Exception e) {
e.printStackTrace();
message.what = 0;
} finally {
if (conn != null) {
conn.disconnect();
}
IOUtils.close(is);
IOUtils.close(fos);
updateHandler.sendMessage(message);
}
}
/**
* 发送更新进度
*
* @param progress
*/
private void sendUpdateProgress(int progress) {
Intent intent = new Intent(ACTION_UPDATE_PROGRESS);
intent.putExtra("progress", progress);
sendBroadcast(intent);
}
/**
* 下载失败通知用户重新下载
*/
private void onFailNotification() {
this.builderNotification.setSmallIcon(iconID).
setContentTitle("更新失败，请重新下载").
setContentIntent(updatePendingIntent).
setAutoCancel(true).
setTicker("更新失败").
setDefaults(1).
setProgress(100, 0, false).
setContentText("下载进度").
build();
this.updateNotificationManager.notify(iconID, this.builderNotification.build());
}
/**
* 下载完毕,后通知用户点击安装
*/
private void downComplete() {
UpdateService.this.isUpdating = false;
String cmd = "chmod 777 " + this.apkFile.getPath();
CmdUtils.execCmd(cmd);
Uri uri = Uri.fromFile(this.apkFile);
Intent updateCompleteIntent = new Intent("android.intent.action.VIEW");
updateCompleteIntent.addCategory("android.intent.category.DEFAULT");
updateCompleteIntent.setDataAndType(uri, "application/vnd.android.package-archive");
this.updatePendingIntent = PendingIntent.getActivity(this, this.appNameID, updateCompleteIntent, PendingIntent.FLAG_UPDATE_CURRENT);
this.builderNotification.setSmallIcon(this.iconID).
setContentTitle(this.getResources().getString(this.appNameID)).
setContentIntent(this.updatePendingIntent).
setAutoCancel(true).
setTicker("更新完成").
setDefaults(1).
setProgress(0, 0, false).
setContentText("更新完成,点击安装").
build();
this.updateNotificationManager.notify(this.iconID, this.builderNotification.build());
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。
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