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我在下载个人资料图片时遇到问题。当我加入这一行开始ID：如何从Facebook获取个人资料图片？
userIds2 = profile.getId();
类
public class MainFragment extends android.support.v4.app.Fragment {
private Database databaseHelper;
private AccessTokenTracker mTokenTracker;
private ProfileTracker mProfileTracker;
private TextView mTextDetails;
private ImageView imageTeste;
private CallbackManager mCallbackManager;
private ImageView fbUserAvatar;
static String name;
static String idade;
private String userIds;
public String userIds2;
static byte[] image;
private FacebookCallback<LoginResult> mCallback = new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
AccessToken accessToken = loginResult.getAccessToken();
Profile profile = Profile.getCurrentProfile();
displayWelcomeMessage(profile);
downloadAvatar();
Intent it2 = new Intent(MainFragment.this.getActivity(), MainActivity.class);
startActivity(it2);
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException e) {
}
};
public MainFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getActivity().getApplicationContext());
mCallbackManager = CallbackManager.Factory.create();
AccessTokenTracker tracker = new AccessTokenTracker() {
@Override
protected void onCurrentAccessTokenChanged(AccessToken old, AccessToken newToken) {
}
};
ProfileTracker profileTracker = new ProfileTracker() {
@Override
protected void onCurrentProfileChanged(Profile oldProfile, Profile newProfile) {
//displayWelcomeMessage(newProfile);
}
};
tracker.startTracking();
profileTracker.startTracking();
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
LoginButton loginButton = (LoginButton)view.findViewById(R.id.login_button);
loginButton.setReadPermissions("user_friends");
loginButton.setFragment(this);
loginButton.registerCallback(mCallbackManager, mCallback);
imageTeste = (ImageView) view.findViewById(R.id.imageTeste);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main, container, false);
}
public void displayWelcomeMessage(Profile profile){
if (profile != null){
name = profile.getName();
idade = profile.getLastName();
}
}
private synchronized void downloadAvatar() {
Profile profile = Profile.getCurrentProfile();
userIds2 = profile.getId();
AsyncTask<Void, Void, Bitmap> task = new AsyncTask<Void, Void, Bitmap>() {
@Override
public Bitmap doInBackground(Void... params) {
URL fbAvatarUrl = null;
try {
fbAvatarUrl = new URL("https://graph.facebook.com/"+userIds2+"/picture?type=large");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Bitmap fbAvatarBitmap = null;
try {
fbAvatarBitmap = BitmapFactory.decodeStream(fbAvatarUrl.openConnection().getInputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return fbAvatarBitmap;
}
@Override
protected void onPostExecute(Bitmap result) {//result vindo null, ver paginas que acessei ontem
//imageTeste.setImageBitmap(result);
image = convertBitmapToByteArray(result);
databaseHelper = new Database(getActivity());
boolean exist = databaseHelper.checkDataBase();
if(exist == false) {
Profile profile = Profile.getCurrentProfile();
name = profile.getName();
idade = profile.getLastName();
long id2 = databaseHelper.insertData(name, idade, image);
if(id2 < 0){
Message.message(getActivity(), "Unsuccessful");
} else{
Message.message(getActivity(), "Successfully Inserted a Row");
}
}
}
};
task.execute();
}
@Override
public void onResume() {
super.onResume();
Profile profile = Profile.getCurrentProfile();
displayWelcomeMessage(profile);
}
@Override
public void onStop() {
super.onStop();
//mTokenTracker.stopTracking();
//mProfileTracker.stopTracking();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
mCallbackManager.onActivityResult(requestCode, resultCode, data);
}
public static byte[] convertBitmapToByteArray(Bitmap bitmap) {
if (bitmap == null) {
return null;
} else {
byte[] b = null;
try {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 0, byteArrayOutputStream);
b = byteArrayOutputStream.toByteArray();
} catch (Exception e) {
e.printStackTrace();
}
return b;
}
}
}
错误的logcat
enter code here
10-02 18:49:05.509 8338-8338/br.com.xxx E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: br.com.xxx, PID: 8338
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=129742, result=-1, data=Intent { (has extras) }} to activity {br.com.xxx/br.com.xxx.IntroActivity}: java.lang.NullPointerException
at android.app.ActivityThread.deliverResults(ActivityThread.java:3365)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3408)
at android.app.ActivityThread.access$1300(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1244)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at br.com.xxx.MainFragment.downloadAvatar(MainFragment.java:140)
at br.com.xxx.MainFragment.access$000(MainFragment.java:46)
at br.com.xxx.MainFragment$1.onSuccess(MainFragment.java:67)
at br.com.xxx.MainFragment$1.onSuccess(MainFragment.java:60)
at com.facebook.login.LoginManager.finishLogin(LoginManager.java:509)
at com.facebook.login.LoginManager.onActivityResult(LoginManager.java:192)
at com.facebook.login.LoginManager$1.onActivityResult(LoginManager.java:140)
at com.facebook.internal.CallbackManagerImpl.onActivityResult(CallbackManagerImpl.java:82)
at br.com.xxx.MainFragment.onActivityResult(MainFragment.java:210)
at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:165)
at android.app.Activity.dispatchActivityResult(Activity.java:5423)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3361)