我正在尝试浏览图库中的图片。但是我得到了以下运行时异常
04-24 08：00：11.787：E / AndroidRuntime（1546）：致命异常：主要 04-24 08：00：11.787：E / AndroidRuntime（1546）：进程：com.dropbox.android.sample，PID：1546 04-24 08：00：11.787：E / AndroidRuntime（1546）：java.lang.RuntimeException：传递结果失败ResultInfo {who = null，request = 1，result = -1，data = Intent {dat = content：// media / external / images / media / 125}} to activity {com.dropbox.android.sample / com.dropbox.android.sample.DBRoulette}：java.lang.NullPointerException 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.ActivityThread.deliverResults（ActivityThread.java:3365） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.ActivityThread.handleSendResult（ActivityThread.java:3408） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.ActivityThread.access $ 1300（ActivityThread.java:135） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1244） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.os.Handler.dispatchMessage（Handler.java:102） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.os.Looper.loop（Looper.java:136） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.ActivityThread.main（ActivityThread.java:5017） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at java.lang.reflect.Method.invokeNative（Native Method） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at java.lang.reflect.Method.invoke（Method.java:515） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:779） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:595） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at dalvik.system.NativeStart.main（Native Method） 04-24 08：00：11.787：E / AndroidRuntime（1546）：引起：java.lang.NullPointerException 04-24 08：00：11.787：E / AndroidRuntime（1546）：at java.io.File.fixSlashes（File.java:185） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at java.io.File。（File.java:134） 04-24 08：00：11.787：E / AndroidRuntime（1546）：at com.dropbox.android.sample.DBRoulette.onActivityResult（DBRoulette.java:298） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.Activity.dispatchActivityResult（Activity.java:5423） 04-24 08：00：11.787：E / AndroidRuntime（1546）：在android.app.ActivityThread.deliverResults（ActivityThread.java:3361） 04-24 08：00：11.787：E / AndroidRuntime（1546）：... 11 more
代码是
package com.dropbox.android.sample;
import java.io.File;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.dropbox.client2.DropboxAPI;
import com.dropbox.client2.android.AndroidAuthSession;
import com.dropbox.client2.android.AuthActivity;
import com.dropbox.client2.session.AccessTokenPair;
import com.dropbox.client2.session.AppKeyPair;
public class DBRoulette extends Activity {
private static final String TAG = "DBRoulette";
///////////////////////////////////////////////////////////////////////////
// Your app-specific settings. //
///////////////////////////////////////////////////////////////////////////
// Replace this with your app key and secret assigned by Dropbox.
// Note that this is a really insecure way to do this, and you shouldn't
// ship code which contains your key & secret in such an obvious way.
// Obfuscation is good.
final static private String APP_KEY = "s9go8rgx96d0nsx";
final static private String APP_SECRET = "424tdfp223r29is";
///////////////////////////////////////////////////////////////////////////
// End app-specific settings. //
///////////////////////////////////////////////////////////////////////////
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
// directory name to store captured images and videos
private static final String IMAGE_DIRECTORY_NAME = "Hello Camera";
private Uri fileUri; // file url to store image/video
static String imagePath;
// You don't need to change these, leave them alone.
final static private String ACCOUNT_PREFS_NAME = "prefs";
final static private String ACCESS_KEY_NAME = "ACCESS_KEY";
final static private String ACCESS_SECRET_NAME = "ACCESS_SECRET";
private static final boolean USE_OAUTH1 = false;
DropboxAPI<AndroidAuthSession> mApi;
private boolean mLoggedIn;
private File file;
// Android widgets
private Button mSubmit;
private LinearLayout mDisplay;
private Button mPhoto;
private Button mRoulette;
private Button btnBrowse;
private ImageView mImage;
Handler hand = new Handler();
private final String PHOTO_DIR = "/Photos/";
final static private int NEW_PICTURE = 1;
final static private int RESULT_LOAD_IMAGE = 1;
protected static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100;
private String mCameraFileName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
mCameraFileName = savedInstanceState.getString("mCameraFileName");
}
// We create a new AuthSession so that we can use the Dropbox API.
AndroidAuthSession session = buildSession();
mApi = new DropboxAPI<AndroidAuthSession>(session);
// Basic Android widgets
setContentView(R.layout.main);
checkAppKeySetup();
mSubmit = (Button)findViewById(R.id.auth_button);
mSubmit.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// This logs you out if you're logged in, or vice versa
if (mLoggedIn) {
logOut();
} else {
// Start the remote authentication
if (USE_OAUTH1) {
mApi.getSession().startAuthentication(DBRoulette.this);
} else {
mApi.getSession().startOAuth2Authentication(DBRoulette.this);
}
}
}
});
mDisplay = (LinearLayout)findViewById(R.id.logged_in_display);
// This is where a photo is displayed
mImage = (ImageView)findViewById(R.id.image_view);
// This is the button to take a photo
mPhoto = (Button)findViewById(R.id.photo_button);
btnBrowse = (Button)findViewById(R.id.btnBrowse);
mPhoto.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
// MediaStore.Images.Media.EXTERNAL_CONTENT_URI isn't working right.
Date date = new Date();
DateFormat df = new SimpleDateFormat("yyyy-MM-dd-kk-mm-ss");
String newPicFile = "Input" + df.format(date) + ".jpg";
String outPath = new File(Environment.getExternalStorageDirectory(), newPicFile).getPath();
File outFile = new File(outPath);
mCameraFileName = outFile.toString();
Uri outuri = Uri.fromFile(outFile);
intent.putExtra(MediaStore.EXTRA_OUTPUT, outuri);
Log.i(TAG, "Importing New Picture: " + mCameraFileName);
try {
startActivityForResult(intent, NEW_PICTURE);
} catch (ActivityNotFoundException e) {
showToast("There doesn't seem to be a camera.");
}
/*Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
// start the image capture Intent
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);*/
}
});
btnBrowse.setOnClickListener(new View.OnClickListener() //remove this
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
// This is the button to take a photo
/*mRoulette = (Button)findViewById(R.id.roulette_button);
mRoulette.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//DownloadRandomPicture download = new DownloadRandomPicture(DBRoulette.this, mApi, PHOTO_DIR, mImage);
//download.execute();
}
});*/
// Display the proper UI state if logged in or not
setLoggedIn(mApi.getSession().isLinked());
}
@Override
protected void onSaveInstanceState(Bundle outState) {
outState.putString("mCameraFileName", mCameraFileName);
super.onSaveInstanceState(outState);
}
@Override
protected void onResume() {
super.onResume();
AndroidAuthSession session = mApi.getSession();
// The next part must be inserted in the onResume() method of the
// activity from which session.startAuthentication() was called, so
// that Dropbox authentication completes properly.
if (session.authenticationSuccessful()) {
try {
// Mandatory call to complete the auth
session.finishAuthentication();
// Store it locally in our app for later use
storeAuth(session);
setLoggedIn(true);
} catch (IllegalStateException e) {
showToast("Couldn't authenticate with Dropbox:" + e.getLocalizedMessage());
Log.i(TAG, "Error authenticating", e);
}
}
}
// This is what gets called on finishing a media piece to import
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == NEW_PICTURE) {
// return from file upload
if (resultCode == Activity.RESULT_OK) {
//Uri uri = null;
//if (data != null) {
// uri = data.getData();
//}
//if (uri == null && mCameraFileName != null) {
// uri = Uri.fromFile(new File(mCameraFileName));
//}
//file = new File(mCameraFileName);
file = new File(mCameraFileName);
//if (uri != null) {
UploadPicture upload = new UploadPicture(this, mApi, PHOTO_DIR, file, mImage);
upload.execute();
//}
} else {
Log.w(TAG, "Unknown Activity Result from mediaImport: "
+ resultCode);
}
}
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
//the path where the image is located is stored in string variable
String picturePath = cursor.getString(columnIndex);
cursor.close();
mImage.setImageBitmap(BitmapFactory.decodeFile(picturePath));
//Displaying the selected image in the image view.
//Displaying the path of the selected image
////////////////////////////////////////////////////////////
/*File file2 = new File(picturePath);
if (resultCode == Activity.RESULT_OK) {
Uri uri = null;
if (data != null) {
uri = data.getData();
}
if (uri == null && picturePath != null) {
uri = Uri.fromFile(new File(picturePath));
}
if (uri != null) {
UploadPicture upload = new UploadPicture(this, mApi, PHOTO_DIR, file2, mImage);
upload.execute();
}
} else {
Log.w(TAG, "Unknown Activity Result from mediaImport: "
+ resultCode);
}*/
}
}
private void logOut() {
// Remove credentials from the session
mApi.getSession().unlink();
// Clear our stored keys
clearKeys();
// Change UI state to display logged out version
setLoggedIn(false);
}
/**
* Convenience function to change UI state based on being logged in
*/
private void setLoggedIn(boolean loggedIn) {
mLoggedIn = loggedIn;
if (loggedIn) {
mSubmit.setText("Unlink from Dropbox");
mDisplay.setVisibility(View.VISIBLE);
} else {
mSubmit.setText("Link with Dropbox");
mDisplay.setVisibility(View.GONE);
mImage.setImageDrawable(null);
}
}
private void checkAppKeySetup() {
// Check to make sure that we have a valid app key
if (APP_KEY.startsWith("CHANGE") ||
APP_SECRET.startsWith("CHANGE")) {
showToast("You must apply for an app key and secret from developers.dropbox.com, and add them to the DBRoulette ap before trying it.");
finish();
return;
}
// Check if the app has set up its manifest properly.
Intent testIntent = new Intent(Intent.ACTION_VIEW);
String scheme = "db-" + APP_KEY;
String uri = scheme + "://" + AuthActivity.AUTH_VERSION + "/test";
testIntent.setData(Uri.parse(uri));
PackageManager pm = getPackageManager();
if (0 == pm.queryIntentActivities(testIntent, 0).size()) {
showToast("URL scheme in your app's " +
"manifest is not set up correctly. You should have a " +
"com.dropbox.client2.android.AuthActivity with the " +
"scheme: " + scheme);
finish();
}
}
private void showToast(String msg) {
Toast error = Toast.makeText(this, msg, Toast.LENGTH_LONG);
error.show();
}
/**
* Shows keeping the access keys returned from Trusted Authenticator in a local
* store, rather than storing user name & password, and re-authenticating each
* time (which is not to be done, ever).
*/
private void loadAuth(AndroidAuthSession session) {
SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0);
String key = prefs.getString(ACCESS_KEY_NAME, null);
String secret = prefs.getString(ACCESS_SECRET_NAME, null);
if (key == null || secret == null || key.length() == 0 || secret.length() == 0) return;
if (key.equals("oauth2:")) {
// If the key is set to "oauth2:", then we can assume the token is for OAuth 2.
session.setOAuth2AccessToken(secret);
} else {
// Still support using old OAuth 1 tokens.
session.setAccessTokenPair(new AccessTokenPair(key, secret));
}
}
/**
* Shows keeping the access keys returned from Trusted Authenticator in a local
* store, rather than storing user name & password, and re-authenticating each
* time (which is not to be done, ever).
*/
private void storeAuth(AndroidAuthSession session) {
// Store the OAuth 2 access token, if there is one.
String oauth2AccessToken = session.getOAuth2AccessToken();
if (oauth2AccessToken != null) {
SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0);
Editor edit = prefs.edit();
edit.putString(ACCESS_KEY_NAME, "oauth2:");
edit.putString(ACCESS_SECRET_NAME, oauth2AccessToken);
edit.commit();
return;
}
// Store the OAuth 1 access token, if there is one. This is only necessary if
// you're still using OAuth 1.
AccessTokenPair oauth1AccessToken = session.getAccessTokenPair();
if (oauth1AccessToken != null) {
SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0);
Editor edit = prefs.edit();
edit.putString(ACCESS_KEY_NAME, oauth1AccessToken.key);
edit.putString(ACCESS_SECRET_NAME, oauth1AccessToken.secret);
edit.commit();
return;
}
}
private void clearKeys() {
SharedPreferences prefs = getSharedPreferences(ACCOUNT_PREFS_NAME, 0);
Editor edit = prefs.edit();
edit.clear();
edit.commit();
}
private AndroidAuthSession buildSession() {
AppKeyPair appKeyPair = new AppKeyPair(APP_KEY, APP_SECRET);
AndroidAuthSession session = new AndroidAuthSession(appKeyPair);
loadAuth(session);
return session;
}
}
答案 0 :(得分：0)
DBRoulette.java:298中的文件路径为空。请参阅：http://grepcode.com/file/repo1.maven.org/maven2/org.robovm/robovm-rt/0.0.2/java/io/File.java#185