Question

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础活动，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，未设置contentview，它只是一个空白屏幕。我面临以下问题。

当fb活动启动时＆amp;我按回来，出现一个空白屏幕，可能（我不确定）是我没有设置的内容视图。我希望它能指导父母活动＆amp;不要这个空白的屏幕。

以下是代码：

父级活动（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（脸谱）

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();
    }
}

任何帮助????

Answer 1

查看代码后几乎没有可能。由于FB很直接，但我不知道你为什么要这样做。根据你的代码......

如果会话有效，您不会处理。因此，如果会话有效，请完成活动。
您应该处理Listener中的所有事件。
您不应在onActivityResult中创建新意图，请使用该函数中传递的意图。

按下后出现空白屏幕

1 个答案: