[英]Login to facebook a button to open a new activity
我試圖在用戶點擊按鈕后登錄到Facebook,然后一旦成功登錄,就會創建新活動。
這是迄今為止主要活動的代碼!
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;
import com.facebook.LoggingBehavior;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.Settings;
public class MainActivity extends Activity {
@SuppressWarnings("unused")
private static final String URL_PREFIX_FRIENDS = "https://graph.facebook.com/me/friends?access_token=";
private Session.StatusCallback statusCallback = new SessionStatusCallback();
private ImageButton fbImgButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fbImgButton = (ImageButton)findViewById(R.id.imageView2);
Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);
Session session = Session.getActiveSession();
if(session == null) {
if(savedInstanceState != null) {
session = Session.restoreSession(this, null, statusCallback, savedInstanceState);
}
if(session== null) {
session = new Session(this);
}
Session.setActiveSession(session);
if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
}
}
updateView();
}
@Override
public void onStart() {
super.onStart();
Session.getActiveSession().addCallback(statusCallback);
}
@Override
public void onStop() {
super.onStop();
Session.getActiveSession().removeCallback(statusCallback);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Session session = Session.getActiveSession();
Session.saveSession(session, outState);
}
private void updateView() {
Session session = Session.getActiveSession();
if(session.isOpened()) {
Toast.makeText(getApplicationContext(), "Logged in....", Toast.LENGTH_LONG).show();
fbImgButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) { loginfb(); }
});
} else {
fbImgButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) { onClickLogin(); }
});
}
}
public void loginfb() {
//start the new activity here
//Toast.makeText(getApplicationContext(), "Works first", Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, SelectionFragment.class);
MainActivity.this.startActivity(intent);
}
private void onClickLogin() {
Session session = Session.getActiveSession();
if (!session.isOpened() && !session.isClosed()) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
} else {
Session.openActiveSession(this, true, statusCallback);
}
Intent intent = new Intent(MainActivity.this, SelectionFragment.class);
MainActivity.this.startActivity(intent);
}
public void shareOnTwitter(View v) {
EditText widget40 = (EditText)findViewById(R.id.widget40);
Uri uri = Uri.parse("https://twitter.com/intent/tweet?text=" + " @coolfacts_fb " + widget40.getText());
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
public void nofb(View v) {
Intent intent = new Intent(v.getContext(), shareTw.class);
startActivityForResult(intent, 0);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private class SessionStatusCallback implements Session.StatusCallback {
@Override
public void call(Session session, SessionState state, Exception exception) {
updateView();
}
}
}
問題是,無論用戶的當前狀態是什么,如果我單擊facebook登錄按鈕進入新活動!
有人能幫幫我嗎?
試試這個:
public class MainActivity extends Activity {
@SuppressWarnings("unused")
private static final String URL_PREFIX_FRIENDS = "https://graph.facebook.com/me/friends?access_token=";
private Session.StatusCallback statusCallback = new SessionStatusCallback();
private ImageButton fbImgButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fbImgButton = (ImageButton)findViewById(R.id.imageView2);
Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);
// Add Session Callback Here
Session.getActiveSession().addCallback(statusCallback);
Session session = Session.getActiveSession();
if(session == null) {
if(savedInstanceState != null) {
session = Session.restoreSession(this, null, statusCallback, savedInstanceState);
}
if(session== null) {
session = new Session(this);
}
Session.setActiveSession(session);
if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
}
// Get Avtive Session again in case of session is null
Session session = Session.getActiveSession();
}
// Dont call updateView() here as we have called this from session callback already.
// updateView();
}
@Override
public void onStart() {
super.onStart();
Session.getActiveSession().addCallback(statusCallback);
}
@Override
public void onStop() {
super.onStop();
Session.getActiveSession().removeCallback(statusCallback);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data);
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
Session session = Session.getActiveSession();
Session.saveSession(session, outState);
}
// Minor changes made with updateView() Method flow
private void updateView() {
Session session = Session.getActiveSession();
fbImgButton.setOnClickListener(new OnClickListener() {
public void onClick(View view) {
if(session.isOpened()){
Toast.makeText(getApplicationContext(), "loginfb...", Toast.LENGTH_LONG).show();
loginfb();
}
else{
Toast.makeText(getApplicationContext(), "onClickLogin...", Toast.LENGTH_LONG).show();
onClickLogin();
}
}
});
}
public void loginfb() {
//start the new activity here
//Toast.makeText(getApplicationContext(), "Works first", Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, SelectionFragment.class);
MainActivity.this.startActivity(intent);
}
private void onClickLogin() {
Session session = Session.getActiveSession();
if (!session.isOpened() && !session.isClosed()) {
session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback));
} else {
Session.openActiveSession(this, true, statusCallback);
}
Intent intent = new Intent(MainActivity.this, SelectionFragment.class);
MainActivity.this.startActivity(intent);
}
public void shareOnTwitter(View v) {
EditText widget40 = (EditText)findViewById(R.id.widget40);
Uri uri = Uri.parse("https://twitter.com/intent/tweet?text=" + " @coolfacts_fb " + widget40.getText());
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
public void nofb(View v) {
Intent intent = new Intent(v.getContext(), shareTw.class);
startActivityForResult(intent, 0);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private class SessionStatusCallback implements Session.StatusCallback {
@Override
public void call(Session session, SessionState state, Exception exception) {
updateView();
}
}
}
檢查一下onCreate()和onStart()的區別。 它清楚地顯示onCreate()在onStart()之前首先調用,因此我們還需要從onCreate()方法添加會話回調。
注意:你可以保持你的updateView()方法,邏輯上沒有任何錯誤。
希望這對你有所幫助。
謝謝。
在“onClickLogin()”方法結束時,在Session有機會打開之前調用startActivity()。 會話開始在后台打開,但新的活動將彈出頂部。
在您的代碼中,看起來您的updateView()方法是對已打開的Session作出反應的正確位置。 如果Session狀態為OPENED,請考慮調用startActivity()。
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