将文件上传到android中的Dropbox，putFile方法抛出异常 [英] Uploading file to Dropbox in android, putFile method throws Exception
问题描述
我正在尝试使用 Dropbox API教程。我在创建活动时登录，并按照本教程中的说明向onResume（）方法添加了一些代码。然后，单击按钮后，调用startService（）方法。
I'm trying to upload a file to Dropbox using the Dropbox API tutorial. I logged in when creating the Activity and I add some code to the onResume() method as said in the tutorial. Then, after clicking a button, startService() method is called.
到达行 com.dropbox.client2.DropboxAPI.Entry response = mDBApi.putFile（ /working-draft.txt，inputStream，file.length（），null，null）;，应用程序将引发一个异常（不是DropboxException或DropboxUnlinkedException，...。它只是进入catch Exception块）。
When it reaches the line "com.dropbox.client2.DropboxAPI.Entry response = mDBApi.putFile("/working-draft.txt", inputStream, file.length(), null, null);", the app throws an Exception (not a DropboxException, nor DropboxUnlinkedException, .... It just enters the catch Exception block).
任何想法可能出什么问题吗？
Any idea what might be wrong?
这是我的代码：
private final static String APP_KEY = "xxxxxxxxxxxxx";
private final static String APP_SECRET = "xxxxxxxxxxxxx";
private DropboxAPI<AndroidAuthSession> mDBApi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AppKeyPair appKeys = new AppKeyPair(APP_KEY, APP_SECRET);
AndroidAuthSession session = new AndroidAuthSession(appKeys);
mDBApi = new DropboxAPI<AndroidAuthSession>(session);
AndroidAuthSession s = mDBApi.getSession();
s.startOAuth2Authentication(MainActivity.this);
}
@Override
protected void onResume() {
super.onResume();
if (mDBApi.getSession().authenticationSuccessful()) {
try {
// Required to complete auth, sets the access token on the session
mDBApi.getSession().finishAuthentication();
String accessToken = mDBApi.getSession().getOAuth2AccessToken();
} catch (IllegalStateException e) {
Log.i("DbAuthLog", "Error authenticating", e);
}
}
}
public void startService(View v) {
String text = "Hello world";
String filePath = Environment.getExternalStorageDirectory() + "/working-draft.txt";
Log.i("SERVICE", filePath);
File file = new File(filePath);
try {
if(!file.exists()){
file.createNewFile();
}
BufferedWriter output = new BufferedWriter(new FileWriter(file));
output.write(text);
output.close();
FileInputStream inputStream = new FileInputStream(file);
com.dropbox.client2.DropboxAPI.Entry response = mDBApi.putFile("/working-draft.txt", inputStream, file.length(), null, null);
Log.i("DbExampleLog", "The uploaded file's rev is: " + response.rev);
}
catch(DropboxUnlinkedException e){
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
Log.i("Exception", errors.toString());
}
catch(DropboxFileSizeException e){
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
Log.i("Exception", errors.toString());
}
catch(DropboxServerException e){
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
Log.i("Exception", errors.toString());
}
catch(DropboxIOException e){
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
Log.i("Exception", errors.toString());
}
catch (DropboxException e){
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
Log.i("Exception", errors.toString());
}
catch (Exception e) {
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
Log.i("Exception", errors.toString());
}
}
这是我得到的stackTrace：
This is the stackTrace I got:
10-23 22:42:34.254: I/Exception(28082): android.os.NetworkOnMainThreadException
10-23 22:42:34.254: I/Exception(28082): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
10-23 22:42:34.254: I/Exception(28082): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
10-23 22:42:34.254: I/Exception(28082): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
10-23 22:42:34.254: I/Exception(28082): at java.net.InetAddress.getAllByName(InetAddress.java:214)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-23 22:42:34.254: I/Exception(28082): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-23 22:42:34.254: I/Exception(28082): at com.dropbox.client2.RESTUtility.execute(RESTUtility.java:387)
10-23 22:42:34.254: I/Exception(28082): at com.dropbox.client2.DropboxAPI$BasicUploadRequest.upload(DropboxAPI.java:1119)
10-23 22:42:34.254: I/Exception(28082): at com.dropbox.client2.DropboxAPI.putFile(DropboxAPI.java:1460)
10-23 22:42:34.254: I/Exception(28082): at com.example.example.MainActivity.startService(MainActivity.java:81)
10-23 22:42:34.254: I/Exception(28082): at java.lang.reflect.Method.invokeNative(Native Method)
10-23 22:42:34.254: I/Exception(28082): at java.lang.reflect.Method.invoke(Method.java:525)
10-23 22:42:34.254: I/Exception(28082): at android.view.View$1.onClick(View.java:3628)
10-23 22:42:34.254: I/Exception(28082): at android.view.View.performClick(View.java:4240)
10-23 22:42:34.254: I/Exception(28082): at android.view.View$PerformClick.run(View.java:17721)
10-23 22:42:34.254: I/Exception(28082): at android.os.Handler.handleCallback(Handler.java:730)
10-23 22:42:34.254: I/Exception(28082): at android.os.Handler.dispatchMessage(Handler.java:92)
10-23 22:42:34.254: I/Exception(28082): at android.os.Looper.loop(Looper.java:137)
10-23 22:42:34.254: I/Exception(28082): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-23 22:42:34.254: I/Exception(28082): at java.lang.reflect.Method.invokeNative(Native Method)
10-23 22:42:34.254: I/Exception(28082): at java.lang.reflect.Method.invoke(Method.java:525)
10-23 22:42:34.254: I/Exception(28082): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-23 22:42:34.254: I/Exception(28082): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-23 22:42:34.254: I/Exception(28082): at dalvik.system.NativeStart.main(Native Method)
谢谢。
推荐答案
您将收到 NetworkOnMainThreadException ，这意味着您正在尝试在主线程上进行网络调用，而Android上是不允许的。 （ putFile 方法对Dropbox API服务器进行网络调用以发送文件内容。）您应该在后台线程上进行此调用。还有其他有关如何执行此操作的答案，例如：如何修复android.os.NetworkOnMainThreadException？
You're getting a NetworkOnMainThreadException, which means you're trying to make a network call on the main thread, which isn't allowed on Android. (The putFile method makes a network call to the Dropbox API servers to send up the file content.) You should make this call on a background thread instead. There are other answers about how to do this, e.g.: How to fix android.os.NetworkOnMainThreadException?
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