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我想檢查用戶是否已經登錄Facebook或不在啓動畫面。我嘗試這一點，但它不工作...android facebook已經登錄
這是我的主要活動...我如何確認用戶已登錄
public class MainActivity extends Activity {
TextView txt1, txt2, txt3;
String Name, Id, Birth;
AccessTokenTracker accessTokenTracker;
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
private static String url_create_product = "http://192.168.1.3:8000/butter_php/fb_user.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
public CallbackManager callback;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_main);
TextView txt = (TextView) findViewById(R.id.txt_skip);
accessTokenTracker = new AccessTokenTracker() {
@Override
protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken newAccessToken) {
updateWithToken(newAccessToken);
}
};
updateWithToken(AccessToken.getCurrentAccessToken());
txt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent skip = new Intent(MainActivity.this,
Awaiting_Approval.class);
startActivity(skip);
}
});
LoginButton authButton = (LoginButton) findViewById(R.id.authButton);
callback = CallbackManager.Factory.create();
authButton.registerCallback(callback,
new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult result) {
// TODO Auto-generated method stub
GraphRequest request = GraphRequest.newMeRequest(
AccessToken.getCurrentAccessToken(),
new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject object,
GraphResponse response) {
String name = object.optString("name");
String id = object.optString("id");
String link = object.optString("link");
String birth = object
.optString("birthday");
// String gender
// =object.optString("gender");
// String location =
// object.optJSONObject("location").optString("name");
Log.d("Name", name);
Log.d("Id", id);
Log.d("Link", link);
Log.d("Birthday", birth);
// Log.d("Gender",gender);
// Log.d("Location", location);
/*
* ProfilePictureView pictureView
* =(ProfilePictureView
*)findViewById(R.id.profilePicture);
*
* pictureView.setCropped(true);
* pictureView.setProfileId(id);
*/
txt1 = (TextView) findViewById(R.id.textView_1);
txt2 = (TextView) findViewById(R.id.textView_2);
txt3 = (TextView) findViewById(R.id.textView_3);
// txt4=(TextView)findViewById(R.id.textView4);
txt1.setText(name);
txt2.setText(id);
txt3.setText(birth);
// txt4.setText(gender);
/*
* Picasso.with(context).load(
* "https://graph.facebook.com/" + id+
* "/picture?type=large").into(img1);
*/
/*
* Intent intent = new
* Intent(MainActivity.this,
* MainActivity.class);
*
*
*
*
*
*
* Bundle bundle =new Bundle();
* bundle.putString
* ("Name",txt1.getText().toString());
* bundle
* .putString("Id",txt2.getText().toString
*());
* bundle.putString("Birthday",txt3.
* getText().toString());
* //bundle.putString
* ("Gender",txt4.getText().toString());
*
* intent.putExtras(bundle);
* startActivity(intent);
*
* finish();
*/
new DoRegister().execute();
Name = txt1.getText().toString();
Id = txt2.getText().toString();
Birth = txt3.getText().toString();
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "id,name,link,birthday");
request.setParameters(parameters);
request.executeAsync();
}
@Override
public void onError(FacebookException error) {
// TODO Auto-generated method stub
System.out.println("onError");
}
@Override
public void onCancel() {
// TODO Auto-generated method stub
System.out.println("onCancel");
}
});
authButton
.setReadPermissions(Arrays
.asList("public_profile,email,user_friends,user_location, user_birthday"));
}
private void updateWithToken(AccessToken currentAccessToken) {
if (currentAccessToken != null) {
Intent i = new Intent(MainActivity.this, Home_Page.class);
startActivity(i);
finish();
}
else {
Intent i = new Intent(MainActivity.this, MainActivity.class);
startActivity(i);
finish();
}
}
class DoRegister extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
protected String doInBackground(String... arg0) {
// TODO Auto-generated method stub
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", Name));
params.add(new BasicNameValuePair("id", Id));
params.add(new BasicNameValuePair("birth", Birth));
JSONObject json = jsonParser.makeHttpRequest(url_create_product,
"POST", params);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
Singleton.GetInstance().setUserId(Id);
Singleton.GetInstance().setUserName(Name);
Singleton.GetInstance().setUserBith(Birth);
Intent it = new Intent(MainActivity.this,
User_Details.class);
Bundle bundle = new Bundle();
bundle.putString("Name", txt1.getText().toString());
bundle.putString("Id", txt2.getText().toString());
bundle.putString("Birthday", txt3.getText().toString());
it.putExtras(bundle);
startActivity(it);
// closing this screen
finish();
} else {
// failed to create product
Log.d(" Response", json.getString("message"));
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callback.onActivityResult(requestCode, resultCode, data);
/*
* if (resultCode == RESULT_OK) { Intent secondActivityIntent = new
* Intent(this, Redirect_page.class);
* startActivity(secondActivityIntent); }
*/
}
}