Android 如何从URL下载视频？
我正在尝试从URL下载视频文件。 下面是我的代码Android 如何从URL下载视频？,android,video,download,Android,Video,Download,我正在尝试从URL下载视频文件。 下面是我的代码 public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ProgressBack PB = new ProgressBack();
PB.execute("");
}
private class ProgressBack extends AsyncTask<String, String, String> {
ProgressDialog PD;
@Override
protected void onPreExecute() {
PD = ProgressDialog.show(MainActivity.this, null, "Please Wait ...", true);
PD.setCancelable(true);
}
@Override
protected String doInBackground(String... arg0) {
downloadFile("https://r8---sn-nhpax-ua8z.googlevideo.com/videoplayback?c=web&clen=17641691&cpn=Mf_hDzzzBYPH8N_J&cver=as3&dur=189.857&expire=1425270280&fexp=905657%2C907263%2C912333%2C926419%2C927622%2C931358%2C934947%2C936928%2C9406255%2C9406746%2C9406850%2C943917%2C945093%2C947225%2C947240%2C948124%2C951703%2C952302%2C952605%2C952612%2C952620%2C952901%2C955301%2C957201%2C959701&gcr=il&gir=yes&id=o-AM54E58Im9m8yqaerEsKkGXOx0IWge8YN4h6OhFkcDTe&initcwndbps=1488750&ip=84.228.53.86&ipbits=0&itag=135&keepalive=yes&key=yt5&lmt=1402678222642477&mime=video%2Fmp4&mm=31&ms=au&mt=1425248654&mv=m&pl=20&ratebypass=yes&requiressl=yes&signature=E8027BCB4C1EE76254FC008B0044655E58485D81.931863F3A7AD6C6B01262BCD723B37E5396D4317&source=youtube&sparams=clen%2Cdur%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&sver=3&upn=moGJHdfD4Z8", "Sample.mp4");
return null;
}
protected void onPostExecute(Boolean result) {
PD.dismiss();
}
}
private void downloadFile(String fileURL, String fileName) {
try {
String rootDir = Environment.getExternalStorageDirectory()
+ File.separator + "Video";
File rootFile = new File(rootDir);
rootFile.mkdir();
URL url = new URL(fileURL);
HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
FileOutputStream f = new FileOutputStream(new File(rootFile,
fileName));
InputStream in = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = in.read(buffer)) > 0) {
f.write(buffer, 0, len1);
}
f.close();
} catch (IOException e) {
Log.d("Error....", e.toString());
}
}
}
public类MainActivity扩展了AppCompatActivity{
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
ProgressBack PB=新的ProgressBack（）；
PB.执行（“”）；
}
私有类ProgressBack扩展异步任务{
进展性帕金森病；
@凌驾
受保护的void onPreExecute（）{
PD=ProgressDialog.show（MainActivity.this，null，“请稍候…”，true）；
PD.可设置可取消（真）；
}
@凌驾
受保护的字符串doInBackground（字符串…arg0）{
下载文件("https://r8---sn-nhpax-ua8z.googlevideo.com/videoplayback?c=web&clen=17641691&cpn=Mf_hDzzzBYPH8N_J&cver=as3&dur=189.857&expire=1425270280&fexp=905657%2C907263%2C912333%2C926419%2C927622%2C931358%2C934947%2C936928%2C9406255%2C9406746%2C9406850%2C943917%2C945093%2C947225%2C947240%2C948124%2C951703%2C952302%2C952605%2C952612%2C952620%2C952901%2C955301%2C957201%2C959701&gcr=il&gir=yes&id=o-AM54E58IM9M8YQAERESKKGXO0IWGE8YN4H6OHFKCDTE&initcwndbps=1488750&ip=84.228.53.86&ipbits=0&itag=135&keepalive=yt5&lmt=1402678222642477&mime=video%2PMP4&mm=31&ms=au&mt=1425248654&mv=m&pl=20&ratebypass=yes&RequiremessL=135&keepalive=yes&KE5&lmt=1402678222467B4B76767F733FCB38D7676767F353F738D767676768F738B47396D4317&source=youtube&sparams=clen%2Cdur%2Cgcr%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cupn%2Cexpire&sver=3&upn=moGJHdfD4Z8，“Sample.mp4”）；
返回null；
}
受保护的void onPostExecute（布尔结果）{
PD.解散（）；
}
}
私有void下载文件（字符串文件URL，字符串文件名）{
试一试{
String rootDir=Environment.getExternalStorageDirectory（）
+File.separator+“视频”；
文件rootFile=新文件（rootDir）；
rootFile.mkdir（）；
URL URL=新URL（文件URL）；
HttpURLConnection c=（HttpURLConnection）url.openConnection（）；
c、 setRequestMethod（“GET”）；
c、 设置输出（真）；
c、 connect（）；
FileOutputStream f=新的FileOutputStream（新文件（根文件，
文件名）；
InputStream in=c.getInputStream（）；
字节[]缓冲区=新字节[1024]；
int len1=0；
而（（len1=in.read（buffer））>0）{
f、 写入（缓冲区，0，len1）；
}
f、 close（）；
}捕获（IOE异常）{
Log.d（“错误…”，例如toString（））；
}
}
}
private static void downloadFile(String url, File outputFile) {
try {
URL u = new URL(url);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new FileOutputStream(outputFile));
fos.write(buffer);
fos.flush();
fos.close();
} catch(FileNotFoundException e) {
return; // swallow a 404
} catch (IOException e) {
return; // swallow a 404
}
}
您可以使用
DownloadMangerDownloadManager.Request request = new DownloadManager.Request(Uri.parse(videoUrl))
.setTitle(file.getName())
.setDescription("Downloading")
.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
.setDestinationUri(Uri.fromFile(file))
.setAllowedOverMetered(true)
.setAllowedOverRoaming(true);
long downloadId = mDownloadManager.enqueue(request);
您可以使用下载管理器类下载文件outputFile？您的文件名Sample.mp4的参数可能重复的内容，请尝试此项。感谢您的回复。我尝试了您的代码，但它不起作用。
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(videoUrl))
.setTitle(file.getName())
.setDescription("Downloading")
.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
.setDestinationUri(Uri.fromFile(file))
.setAllowedOverMetered(true)
.setAllowedOverRoaming(true);
long downloadId = mDownloadManager.enqueue(request);