我们有一个rest api，我可以在其中获取需要下载并保存到设备的文件列表，这些文件位于我创建的文件夹中。所以我可以一个一个地保存文件，不确定这是如何工作的。
这些文件是从WCF api下载的。传出流内容类型是从wcf服务OCTET_STREAM的。
首先我获取/创建目录，并创建文件：
File mediadir = context.getDir("foo", Context.MODE_PRIVATE);
File file = new File(mediadir, "newfile.png"); // the file name I get from the server, it could be any thing
FileOutputStream out = new FileOutputStream(file); // Stream the contents of the file on the server to the localfile?
我正在尝试下载这样的文件：
File mediadir = context.getDir("tvr", Context.MODE_PRIVATE);
URL url = new URL(urlString);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
InputStream is = url.openStream();
FileOutputStream fos = new FileOutputStream(mediadir+"/video.mp4");
byte data[] = new byte[1024];
int count = 0;
long total = 0;
int progress = 0;
while ((count=is.read(data)) != -1){
total += count;
int progress_temp = (int)total*100/lenghtOfFile;
if(progress_temp%10 == 0 && progress != progress_temp){
progress = progress_temp;
}
fos.write(data, 0, count);
}
is.close();
fos.close();
一旦它到达. connect（），我就会得到错误java.net。SocketException：套接字失败：EACCES（权限被拒绝）
我的清单看起来像这样：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.tvrplayer"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<permission android:name="android.permission.INTERNET"></permission>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.tvrplayer.MainActivity"
android:label="@string/app_name"
android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
如何将api文件保存到我创建的本地导演？
我还编写了一个对用户浏览器执行此操作的Web应用程序，但我不确定它在android上的工作原理。
更新
所以在我把线变成权限错误消失后，现在我有了一个新的错误：
02-20 09:51:28.909: E/AndroidRuntime(12594): FATAL EXCEPTION: main
02-20 09:51:28.909: E/AndroidRuntime(12594): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tvrplayer/com.example.tvrplayer.MainActivity}: android.os.NetworkOnMainThreadException
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.ActivityThread.access$600(ActivityThread.java:128)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.os.Handler.dispatchMessage(Handler.java:99)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.os.Looper.loop(Looper.java:137)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.ActivityThread.main(ActivityThread.java:4514)
02-20 09:51:28.909: E/AndroidRuntime(12594): at java.lang.reflect.Method.invokeNative(Native Method)
02-20 09:51:28.909: E/AndroidRuntime(12594): at java.lang.reflect.Method.invoke(Method.java:511)
02-20 09:51:28.909: E/AndroidRuntime(12594): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
02-20 09:51:28.909: E/AndroidRuntime(12594): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
02-20 09:51:28.909: E/AndroidRuntime(12594): at dalvik.system.NativeStart.main(Native Method)
02-20 09:51:28.909: E/AndroidRuntime(12594): Caused by: android.os.NetworkOnMainThreadException
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.io.IoBridge.connect(IoBridge.java:112)
02-20 09:51:28.909: E/AndroidRuntime(12594): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
02-20 09:51:28.909: E/AndroidRuntime(12594): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
02-20 09:51:28.909: E/AndroidRuntime(12594): at java.net.Socket.connect(Socket.java:842)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:77)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
02-20 09:51:28.909: E/AndroidRuntime(12594): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
02-20 09:51:28.909: E/AndroidRuntime(12594): at com.example.tvrplayer.MainActivity.download(MainActivity.java:127)
02-20 09:51:28.909: E/AndroidRuntime(12594): at com.example.tvrplayer.MainActivity.downLoadMedia(MainActivity.java:118)
02-20 09:51:28.909: E/AndroidRuntime(12594): at com.example.tvrplayer.MainActivity.onCreate(MainActivity.java:52)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.Activity.performCreate(Activity.java:4465)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
02-20 09:51:28.909: E/AndroidRuntime(12594): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
02-20 09:51:28.909: E/AndroidRuntime(12594): ... 11 more
File path = new File(getActivity().getFilesDir(), "Your Folder Name");
// if the directory doesn't exist it will create one.
path.mkdirs();
File file = new File(path,"Your File Name");
//if the file doesn't exist it will create one
file.createNewFile();
//for write
FileOutputStream fout = new FileOutputStream(file);
ObjectOutputStream os = new ObjectOutputStream(fout);
os.writeObject("Your Object");
os.flush();
os.close();
//for read
FileInputStream fis = new FileInputStream(file);
ObjectInputStream is = new ObjectInputStream(fis);
Your_Object_Type variable = (Your_Object_Type) is.readObject();
is.close();
在我的例子中，我写了一个类对象
编辑：
这是发生，因为你有使用互联网请求在主UI线程。修改你的代码：
new Thread( new Runnable() {
@Override
public void run() {
try {
//............
// your internet code
//.............
} catch (Exception e) {
// TODO Auto-generated catch block
Log.e(Tag, e.toString());
}
}
}).start();
编辑2：如果您想知道文件是否已保存，请检查以下内容：
File file = new File(mediadir, "newfile.png");
if(file.exists()){
//that means the "newfile.png" is exist in otherword it is saved
}else{
//that means the "newfile.png" does not exist in otherword it is not saved
}
