我有一个按钮，可以将列出的目录中的所有文件上传到dropbox，但只要我点击它，应用就会一直崩溃。我尝试按照此Dialog throwing "Unable to add window — token null is not for an application” with getApplication() as context并更改
mDialog = new ProgressDialog(mContext);
到
mDialog = new ProgressDialog(Dropbox.this);
主要活动
public class Dropbox extends AppCompatActivity implements View.OnClickListener {
private DropboxAPI<AndroidAuthSession> dropbox;
private final static String FILE_DIR = "/DropboxSample/";
private final static String DROPBOX_NAME = "dropbox_prefs";
private final static String ACCESS_KEY = "INSERT KEY HERE";
private final static String ACCESS_SECRET = "INSERT KEY HERE";
private boolean isLoggedIn;
private Button logIn;
private Button uploadFile;
private Button listFiles;
private LinearLayout container;
private static final int SELECT_PHOTO = 100;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dropbox);
logIn = (Button) findViewById(R.id.dropbox_login);
logIn.setOnClickListener(this);
uploadFile = (Button) findViewById(R.id.upload_file);
uploadFile.setOnClickListener(this);
//listFiles = (Button) findViewById(R.id.list_files);
//listFiles.setOnClickListener(this);
container = (LinearLayout) findViewById(R.id.container_files);
loggedIn(false);
AndroidAuthSession session;
AppKeyPair pair = new AppKeyPair(ACCESS_KEY, ACCESS_SECRET);
SharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0);
String key = prefs.getString(ACCESS_KEY, null);
String secret = prefs.getString(ACCESS_SECRET, null);
if (key != null && secret != null) {
AccessTokenPair token = new AccessTokenPair(key, secret);
session = new AndroidAuthSession(pair, Session.AccessType.APP_FOLDER, token);
} else {
session = new AndroidAuthSession(pair, Session.AccessType.APP_FOLDER);
}
dropbox = new DropboxAPI<AndroidAuthSession>(session);
}
@Override
protected void onResume() {
super.onResume();
AndroidAuthSession session = dropbox.getSession();
if (session.authenticationSuccessful()) {
try {
session.finishAuthentication();
TokenPair tokens = session.getAccessTokenPair();
SharedPreferences prefs = getSharedPreferences(DROPBOX_NAME, 0);
SharedPreferences.Editor editor = prefs.edit();
editor.putString(ACCESS_KEY, tokens.key);
editor.putString(ACCESS_SECRET, tokens.secret);
editor.commit();
loggedIn(true);
} catch (IllegalStateException e) {
Toast.makeText(this, "Error during Dropbox authentication",
Toast.LENGTH_SHORT).show();
}
}
}
public void loggedIn(boolean isLogged) {
isLoggedIn = isLogged;
uploadFile.setEnabled(isLogged);
listFiles.setEnabled(isLogged);
logIn.setText(isLogged ? "Log out" : "Log in");
}
private final Handler handler = new Handler() {
public void handleMessage(Message msg) {
ArrayList<String> result = msg.getData().getStringArrayList("data");
for (String fileName : result) {
Log.i("ListFiles", fileName);
TextView tv = new TextView(Dropbox.this);
tv.setText(fileName);
container.addView(tv);
}
}
};
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dropbox_login:
if (isLoggedIn) {
dropbox.getSession().unlink();
loggedIn(false);
} else {
dropbox.getSession().startAuthentication(Dropbox.this);
}
break;
// case R.id.list_files:
// ListDropboxFiles list = new ListDropboxFiles(dropbox, FILE_DIR,
// handler);
//list.execute();
//break;
case R.id.upload_file:
UploadFileToDropbox upload = new UploadFileToDropbox(this, dropbox, FILE_DIR);
upload.execute();
break;
default:
break;
}
}
public class UploadFileToDropbox extends AsyncTask<Void, Void, Boolean> {
private DropboxAPI<?> dropbox;
private String mPath;
private long mFileLen;
private final ProgressDialog mDialog;
private DropboxAPI.UploadRequest mRequest;
private Context mContext;
private String mErrorMsg;
private File[] listFile;
public UploadFileToDropbox(Context context, DropboxAPI<?> dropbox, String path) {
File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "/ImageLocationforApp");
listFile = file.listFiles();
mContext = context.getApplicationContext();
this.dropbox = dropbox;
this.mPath = path;
for(int y=0 ; y<listFile.length ; y++){
mFileLen = listFile[y].length() + mFileLen;
}
mDialog = new ProgressDialog(mContext);
mDialog.setMax(100);
mDialog.setMessage("Uploading " + file);
mDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
mDialog.setProgress(0);
mDialog.setButton(ProgressDialog.BUTTON_POSITIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// This will cancel the putFile operation
try {
mRequest.abort();
} catch (Exception e) {
}
}
});
mDialog.show();
mDialog.setCanceledOnTouchOutside(false);
}
@Override
protected Boolean doInBackground(Void... params) {
try {
// By creating a request, we get a handle to the putFile operation,
// so we can cancel it later if we want to
for(int y=0 ; y<listFile.length;y++) {
FileInputStream fis = new FileInputStream(listFile[y]);
String path = mPath + listFile[y].getName();
mRequest = dropbox.putFileOverwriteRequest(path, fis, listFile[y].length(),
new ProgressListener() {
@Override
public long progressInterval() {
// Update the progress bar every half-second or so
return 500;
}
@Override
public void onProgress(long bytes, long total) {
publishProgress(bytes);
}
});
}
if (mRequest != null) {
mRequest.upload();
return true;
}
} catch (DropboxUnlinkedException e) {
// This session wasn't authenticated properly or user unlinked
mErrorMsg = "This app wasn't authenticated properly.";
} catch (DropboxFileSizeException e) {
// File size too big to upload via the API
mErrorMsg = "This file is too big to upload";
} catch (DropboxPartialFileException e) {
// We canceled the operation
mErrorMsg = "Upload canceled";
} catch (DropboxServerException e) {
// Server-side exception. These are examples of what could happen,
// but we don't do anything special with them here.
if (e.error == DropboxServerException._401_UNAUTHORIZED) {
// Unauthorized, so we should unlink them. You may want to
// automatically log the user out in this case.
} else if (e.error == DropboxServerException._403_FORBIDDEN) {
// Not allowed to access this
} else if (e.error == DropboxServerException._404_NOT_FOUND) {
// path not found (or if it was the thumbnail, can't be
// thumbnailed)
} else if (e.error == DropboxServerException._507_INSUFFICIENT_STORAGE) {
// user is over quota
} else {
// Something else
}
// This gets the Dropbox error, translated into the user's language
mErrorMsg = e.body.userError;
if (mErrorMsg == null) {
mErrorMsg = e.body.error;
}
} catch (DropboxIOException e) {
// Happens all the time, probably want to retry automatically.
mErrorMsg = "Network error. Try again.";
} catch (DropboxParseException e) {
// Probably due to Dropbox server restarting, should retry
mErrorMsg = "Dropbox error. Try again.";
} catch (DropboxException e) {
// Unknown error
mErrorMsg = "Unknown error. Try again.";
} catch (FileNotFoundException e) {
}
return false;
}
protected void onProgressUpdate(Long... progress) {
int percent = (int) (100.0 * (double) progress[0] / mFileLen + 0.5);
mDialog.setProgress(percent);
}
@Override
protected void onPostExecute(Boolean result) {
mDialog.dismiss();
if (result) {
showToast("Successfully uploaded");
} else {
showToast(mErrorMsg);
}
}
private void showToast(String msg) {
Toast error = Toast.makeText(mContext, msg, Toast.LENGTH_LONG);
error.show();
}
}
}
错误记录
01-18 18:01:45.919 27010-27010/com.sp.fyp.captury E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.sp.fyp.captury, PID: 27010
android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
at android.view.ViewRootImpl.setView(ViewRootImpl.java:691)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:288)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:312)
at com.sp.fyp.captury.Dropbox$UploadFileToDropbox.<init>(Dropbox.java:197)
at com.sp.fyp.captury.Dropbox.onClick(Dropbox.java:146)
at android.view.View.performClick(View.java:5184)
at android.view.View$PerformClick.run(View.java:20910)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
更改为Dropbox.this后的错误日志
Process: com.sp.fyp.captury, PID: 7414
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sp.fyp.captury/com.sp.fyp.captury.Dropbox}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setEnabled(boolean)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2702)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1449)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setEnabled(boolean)' on a null object reference
at com.sp.fyp.captury.Dropbox.loggedIn(Dropbox.java:112)
at com.sp.fyp.captury.Dropbox.onCreate(Dropbox.java:70)
at android.app.Activity.performCreate(Activity.java:6289)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2655)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1449)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5951)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)