当我从 evernote 运行示例应用程序时 - 它可以工作。如果我将活动（和所有库）复制到我的应用程序，在我的应用程序的启动活动中，它会在 onResume 方法中使用 NullPointerException 强制关闭。
public class HelloEDAM extends Activity {
/***************************************************************************
* You MUST change the following values to run this sample application. *
***************************************************************************/
// Your Evernote API key. See http://dev.evernote.com/documentation/cloud/
// Please obfuscate your code to help keep these values secret.
private static final String CONSUMER_KEY = "*******";
private static final String CONSUMER_SECRET = "*******";
/***************************************************************************
* Change these values as needed to use this code in your own application. *
***************************************************************************/
// Name of this application, for logging
private static final String TAG = "HelloEDAM";
// A directory on disk where your application stores temporary data
private static final String APP_DATA_PATH =
"/Android/data/com.evernote.android.sample/temp/";
// Change to "www.evernote.com" to use the Evernote production service
// instead of the sandbox
private static final String EVERNOTE_HOST = "sandbox.evernote.com";
private static final String APP_NAME = "Evernote Android Sample";
private static final String APP_VERSION = "1.0";
/***************************************************************************
* The following values are simply part of the demo application. *
***************************************************************************/
// Activity result request codes
private static final int SELECT_IMAGE = 1;
// The ENML preamble to every Evernote note.
// Note content goes between <en-note> and </en-note>
private static final String NOTE_PREFIX =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<!DOCTYPE en-note SYSTEM \"http://xml.evernote.com/pub/enml2.dtd\">" +
"<en-note>";
// The ENML postamble to every Evernote note
private static final String NOTE_SUFFIX = "</en-note>";
// Used to interact with the Evernote web service
private EvernoteSession session;
// UI elements that we update
private Button btnAuth;
private Button btnSave;
private Button btnSelect;
private TextView msgArea;
// The path to and MIME type of the currently selected image from the gallery
private String filePath;
private String mimeType;
private String fileName;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
msgArea = (TextView)findViewById(R.id.message);
btnAuth = (Button) findViewById(R.id.auth_button);
btnSelect = (Button) findViewById(R.id.select_button);
btnSave = (Button) findViewById(R.id.save_button);
setupSession();
}
@Override
public void onResume() {
super.onResume();
// Complete the Evernote authentication process if necessary
if (!session.completeAuthentication()) {
// We only want to do this when we're resuming after authentication...
Toast.makeText(this, "Evernote login failed", Toast.LENGTH_LONG).show();
}
updateUi();
}
/**
* Setup the EvernoteSession used to access the Evernote API.
*/
private void setupSession() {
ApplicationInfo info =
new ApplicationInfo(CONSUMER_KEY, CONSUMER_SECRET, EVERNOTE_HOST,
APP_NAME, APP_VERSION);
// TODO Retreived the cached Evernote AuthenticationResult if it exists
// if (hasCachedEvernoteCredentials) {
// AuthenticationResult result = new AuthenticationResult(authToken, noteStoreUrl, webApiUrlPrefix, userId);
// session = new EvernoteSession(info, result, getTempDir());
// } else {
session = new EvernoteSession(info, getTempDir());
// }
updateUi();
}
/**
* Update the UI based on Evernote authentication state.
*/
private void updateUi() {
if (session.isLoggedIn()) {
btnAuth.setText(R.string.label_log_out);
btnSave.setEnabled(true);
btnSelect.setEnabled(true);
} else {
btnAuth.setText(R.string.label_log_in);
btnSave.setEnabled(false);
btnSelect.setEnabled(false);
}
}
/**
* Called when the user taps the "Select Image" button.
*
* Sends the user to the image gallery to choose an image to share.
*/
public void startAuth(View view) {
if (session.isLoggedIn()) {
session.logOut();
} else {
session.authenticate(this);
}
updateUi();
}
/**
* Get a temporary directory that can be used by this application to store potentially
* large files sent to and retrieved from the Evernote API.
*/
private File getTempDir() {
return new File(Environment.getExternalStorageDirectory(), APP_DATA_PATH);
}
/***************************************************************************
* The remaining code in this class simply demonstrates the use of the *
* Evernote API once authentication is complete. You don't need any of it *
* in your application. *
***************************************************************************/
/**
* Called when the user taps the "Select Image" button.
*
* Sends the user to the image gallery to choose an image to share.
*/
public void startSelectImage(View view) {
Intent intent = new Intent(Intent.ACTION_PICK,
MediaStore.Images.Media.INTERNAL_CONTENT_URI);
startActivityForResult(intent, SELECT_IMAGE);
}
/**
* Called when the control returns from an activity that we launched.
*/
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SELECT_IMAGE) {
// Callback from our 'startSelectImage' action
if (resultCode == Activity.RESULT_OK) {
endSelectImage(data);
}
}
}
/**
* Called when control returns from the image gallery picker.
* Loads the image that the user selected.
*
* @param data The data returned from the activity.
*/
private void endSelectImage(Intent data) {
// The callback from the gallery contains a pointer into a table.
// Look up the appropriate record and pull out the information that we need,
// in this case, the path to the file on disk, the file name and the MIME type.
Uri selectedImage = data.getData();
String[] queryColumns = { MediaStore.Images.Media.DATA,
MediaStore.Images.Media.MIME_TYPE,
MediaStore.Images.Media.DISPLAY_NAME };
Cursor cursor = getContentResolver().query(selectedImage, queryColumns, null, null, null);
cursor.moveToFirst();
this.filePath = cursor.getString(cursor.getColumnIndex(queryColumns[0]));
this.mimeType = cursor.getString(cursor.getColumnIndex(queryColumns[1]));
this.fileName = cursor.getString(cursor.getColumnIndex(queryColumns[2]));
cursor.close();
if (session.isLoggedIn()) {
this.msgArea.setText(this.fileName);
this.btnSave.setEnabled(true);
}
}
/**
* Called when the user taps the "Save Image" button.
*
* You probably don't want to do this on your UI thread in the
* real world.
*
* Saves the currently selected image to the user's Evernote account using
* the Evernote web service API.
*
* Does nothing if the Evernote API wasn't successfully initialized
* when the activity started.
*/
public void saveImage(View view) {
if (session.isLoggedIn()) {
String f = this.filePath;
try {
// Hash the data in the image file. The hash is used to refernece the
// file in the ENML note content.
InputStream in = new BufferedInputStream(new FileInputStream(f));
FileData data = new FileData(EDAMUtil.hash(in), new File(f));
in.close();
// Create a new Resource
Resource resource = new Resource();
resource.setData(data);
resource.setMime(this.mimeType);
// Create a new Note
Note note = new Note();
note.setTitle("Android test note");
note.addToResources(resource);
// Set the note's ENML content. Learn about ENML at
// http://dev.evernote.com/documentation/cloud/chapters/ENML.php
String content =
NOTE_PREFIX +
"<p>This note was uploaded from Android. It contains an image.</p>" +
"<en-media type=\"" + this.mimeType + "\" hash=\"" +
EDAMUtil.bytesToHex(resource.getData().getBodyHash()) + "\"/>" +
NOTE_SUFFIX;
note.setContent(content);
// Create the note on the server. The returned Note object
// will contain server-generated attributes such as the note's
// unique ID (GUID), the Resource's GUID, and the creation and update time.
Note createdNote = session.createNoteStore().createNote(session.getAuthToken(), note);
Toast.makeText(this, R.string.msg_image_saved, Toast.LENGTH_LONG).show();
} catch (Throwable t) {
// It's generally bad form to catch Throwable, but for this simple demo,
// we want to trap and log all errors.
Toast.makeText(this, R.string.err_creating_note, Toast.LENGTH_LONG).show();
Log.e(TAG, getString(R.string.err_creating_note), t);
}
}
}
}
日志错误：
06-17 12:50:34.833: W/dalvikvm(1759): threadid=1: thread exiting with uncaught exception (group=0x40a291f8)
06-17 12:50:34.843: E/AndroidRuntime(1759): FATAL EXCEPTION: main
06-17 12:50:34.843: E/AndroidRuntime(1759): java.lang.RuntimeException: Unable to resume activity {com.smirnoft.Library/com.smirnoft.Library.Evernote.HelloEDAM}: java.lang.NullPointerException
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2567)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2595)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2109)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread.access$600(ActivityThread.java:132)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1157)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.os.Handler.dispatchMessage(Handler.java:99)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.os.Looper.loop(Looper.java:137)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread.main(ActivityThread.java:4575)
06-17 12:50:34.843: E/AndroidRuntime(1759): at java.lang.reflect.Method.invokeNative(Native Method)
06-17 12:50:34.843: E/AndroidRuntime(1759): at java.lang.reflect.Method.invoke(Method.java:511)
06-17 12:50:34.843: E/AndroidRuntime(1759): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
06-17 12:50:34.843: E/AndroidRuntime(1759): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
06-17 12:50:34.843: E/AndroidRuntime(1759): at dalvik.system.NativeStart.main(Native Method)
06-17 12:50:34.843: E/AndroidRuntime(1759): Caused by: java.lang.NullPointerException
06-17 12:50:34.843: E/AndroidRuntime(1759): at com.smirnoft.Library.Evernote.HelloEDAM.onResume(HelloEDAM.java:131)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1154)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.Activity.performResume(Activity.java:4539)
06-17 12:50:34.843: E/AndroidRuntime(1759): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2557)
06-17 12:50:34.843: E/AndroidRuntime(1759): ... 12 more