如何从Facebook为Android工作室获取用户名
我一直试图通过学习这个stackoverflow 链接从Facebook获取用户名
我是一个新开发者，我真的找不到解决方案，请检查我一直在做的代码，我是新手，请帮忙
请不要给我已经尝试过的链接，我请求你编辑代码来帮忙
public class MainActivity extends AppCompatActivity { private TextView mTextDetails; private CallbackManager mCallbackManager; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); FacebookSdk.sdkInitialize(this.getApplicationContext()); mCallbackManager=CallbackManager.Factory.create(); setContentView(R.layout.activity_main); //instantiate callbacks manager mCallbackManager = CallbackManager.Factory.create(); } private FacebookCallback mcallback = new FacebookCallback() { @Override public void onSuccess(LoginResult loginResult) { AccessToken accessToken = loginResult.getAccessToken(); Profile profile = Profile.getCurrentProfile(); if (profile != null){ mTextDetails = (TextView)findViewById(R.id.text_details); mTextDetails.setText("Welcome "+ profile.getName()); } } @Override public void onCancel() { } @Override public void onError(FacebookException error) { } }; @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); mCallbackManager.onActivityResult(requestCode, resultCode, data); }} 下面是我的XML文件
我希望用户名在Textview中显示在android：id =“@ + id / text_details ”
您可以检查名为UserinfoChangedCallback的特定方法
loginBtn = (LoginButton) findViewById(R.id.fb_login_button); loginBtn.setUserInfoChangedCallback(new UserInfoChangedCallback() { @Override public void onUserInfoFetched(GraphUser user) { if (user != null) { userName.setText("Hello, " + user.getName()); } else { userName.setText("You are not logged"); } } });
userName是我在我的应用程序中的TextView。 成功登录后，将显示用户名。
完整的代码是，
import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Arrays; import java.util.List; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; import android.content.pm.Signature; import android.os.Bundle; import android.util.Base64; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.facebook.Request; import com.facebook.Response; import com.facebook.Session; import com.facebook.SessionState; import com.facebook.UiLifecycleHelper; import com.facebook.model.GraphUser; import com.facebook.widget.LoginButton; import com.facebook.widget.LoginButton.UserInfoChangedCallback; import com.natarajan.drapjabdulkalam.R; public class ShareHelper extends Activity{ private LoginButton loginBtn; //private Button postImageBtn; private Button updateStatusBtn; private TextView fbquote; private TextView userName; private UiLifecycleHelper uiHelper; private static final List PERMISSIONS = Arrays.asList("publish_actions"); private String message; //private static String message = "Sample status posted from android app"; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Add code to print out the key hash try { PackageInfo info = getPackageManager().getPackageInfo( "com.facebook.samples.hellofacebook", PackageManager.GET_SIGNATURES); for (Signature signature : info.signatures) { MessageDigest md = MessageDigest.getInstance("SHA"); md.update(signature.toByteArray()); Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT)); } } catch (NameNotFoundException e) { } catch (NoSuchAlgorithmException e) { } Intent intent = getIntent(); message = intent.getStringExtra("quote"); uiHelper = new UiLifecycleHelper(this, statusCallback); uiHelper.onCreate(savedInstanceState); setContentView(R.layout.sharehelper_activity); fbquote = (TextView)findViewById(R.id.FbTextView); fbquote.setText(message); userName = (TextView) findViewById(R.id.user_name); loginBtn = (LoginButton) findViewById(R.id.fb_login_button); loginBtn.setUserInfoChangedCallback(new UserInfoChangedCallback() { @Override public void onUserInfoFetched(GraphUser user) { if (user != null) { userName.setText("Hello, " + user.getName()); } else { userName.setText("You are not logged"); } } }); /* postImageBtn = (Button) findViewById(R.id.post_image); postImageBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { postImage(); } });*/ updateStatusBtn = (Button) findViewById(R.id.update_status); updateStatusBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { postStatusMessage(); } }); buttonsEnabled(false); } private Session.StatusCallback statusCallback = new Session.StatusCallback() { @Override public void call(Session session, SessionState state, Exception exception) { if (state.isOpened()) { buttonsEnabled(true); Log.d("FacebookSampleActivity", "Facebook session opened"); } else if (state.isClosed()) { buttonsEnabled(false); Log.d("FacebookSampleActivity", "Facebook session closed"); } } }; public void buttonsEnabled(boolean isEnabled) { // postImageBtn.setEnabled(isEnabled); updateStatusBtn.setEnabled(isEnabled); } /* public void postImage() { if (checkPermissions()) { Bitmap img = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); Request uploadRequest = Request.newUploadPhotoRequest( Session.getActiveSession(), img, new Request.Callback() { @Override public void onCompleted(Response response) { Toast.makeText(ShareHelper.this, "Photo uploaded successfully", Toast.LENGTH_LONG).show(); } }); uploadRequest.executeAsync(); } else { requestPermissions(); } } */ public void postStatusMessage() { if (checkPermissions()) { Request request = Request.newStatusUpdateRequest( Session.getActiveSession(), message, new Request.Callback() { @Override public void onCompleted(Response response) { if (response.getError() == null) Toast.makeText(ShareHelper.this, "Quote Shared successfully", Toast.LENGTH_LONG).show(); } }); request.executeAsync(); } else { requestPermissions(); } } public boolean checkPermissions() { Session s = Session.getActiveSession(); if (s != null) { return s.getPermissions().contains("publish_actions"); } else return false; } public void requestPermissions() { Session s = Session.getActiveSession(); if (s != null) s.requestNewPublishPermissions(new Session.NewPermissionsRequest( this, PERMISSIONS)); } @Override public void onResume() { super.onResume(); uiHelper.onResume(); buttonsEnabled(Session.getActiveSession().isOpened()); } @Override public void onPause() { super.onPause(); uiHelper.onPause(); } @Override public void onDestroy() { super.onDestroy(); uiHelper.onDestroy(); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); uiHelper.onActivityResult(requestCode, resultCode, data); } @Override public void onSaveInstanceState(Bundle savedState) { super.onSaveInstanceState(savedState); uiHelper.onSaveInstanceState(savedState); } }
和XML是，