我希望我的应用程序使用 fb 登录（这是可选的）。所以首先我要启动我的基本活动，然后将 fb 活动作为子活动。我希望当用户按下后退按钮时，它应该返回其父活动。对于 facebook 活动，没有设置 contentview，它只是一个空白屏幕。我面临以下问题。
- 当启动 fb 活动并按回时，会出现一个空白屏幕，这可能（我不确定）是我尚未设置的内容视图。我希望它指向父活动而不是这个空白屏幕。
以下是代码：
家长活动（启动器）
public class AccountSettingsActivity extends Activity {
/** Called when the activity is first created. */
Button registerButton;
Button fbButton;
AccountSettingsActivity ob ;
final Context cont = this;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.account);
Log.i ("Location_settings", "In Account Settings Class");
registerButton = (Button)this.findViewById(R.id.registerbutton);
fbButton = (Button)this.findViewById(R.id.fbbutton);
registerButton.setVisibility(1);
//Toast.makeText(cont, "In Accounts Settings", Toast.LENGTH_LONG);
fbButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Log.i("Account-Settings","fb Button clicked");
Intent fb = new Intent(AccountSettingsActivity.this,facebookMain.class);
fb.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
startActivityForResult(fb,0);
}
});
registerButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Log.i("Account-Settings","Register Button clicked");
ProgressDialog dialog = ProgressDialog.show(AccountSettingsActivity.this, "Syncing with server", "Please wait...", true);
new initialsync(dialog).execute("");
}
});
fbButton.performClick();
}
}
儿童活动（脸书）
public class facebookMain extends Activity {
String abc;
Facebook facebook = new Facebook("1234567890");
private SharedPreferences mPrefs;
private Bundle parameters;
facebookMain ob;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*
* Get existing access_token if any
*/
mPrefs = getPreferences(MODE_PRIVATE);
String access_token = mPrefs.getString("access_token", null);
long expires = mPrefs.getLong("access_expires", 0);
if(access_token != null) {
facebook.setAccessToken(access_token);
}
if(expires != 0) {
facebook.setAccessExpires(expires);
}
/*
* Only call authorize if the access_token has expired.
*/
if(!facebook.isSessionValid()) {
facebook.authorize(this, new String[] { "read_friendlists", "read_mailbox", "email" }, new DialogListener() {
@Override
public void onComplete(Bundle values) {
SharedPreferences.Editor editor = mPrefs.edit();
editor.putString("access_token", facebook.getAccessToken());
abc = facebook.getAccessToken();
editor.putLong("access_expires", facebook.getAccessExpires());
editor.commit();
Intent intent=new Intent();
intent.putExtra("access token",abc);
setResult(RESULT_OK, intent);
finish();
}
@Override
public void onFacebookError(FacebookError error) {}
@Override
public void onCancel() {
finish();
}
@Override
public void onError(DialogError e) {
// TODO Auto-generated method stub
}
});
}
if(facebook.isSessionValid())
{
SharedPreferences shared = mPrefs;
abc = shared.getString("access_token", "");
Intent intent=new Intent();
intent.putExtra("access_token",abc);
setResult(RESULT_OK, intent);
Toast.makeText(ob,"facebook session valid", Toast.LENGTH_SHORT);
finish();
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
facebook.authorizeCallback(requestCode, resultCode, data);
AppLog.logger("facebookmain, Back key pressed");
Intent intent=new Intent();
intent.putExtra("abc",abc);
setResult(RESULT_OK, intent);
finish();
}
}
有什么帮助吗？？？