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我正在尝试制作一个与 facebook 集成的应用程序，并按照 facebook 的说明进行操作。但是，“ProfilePictureView”在注销后并没有返回空白。有没有办法“空白” ProfilePictureView 或者它只是不提供这样的功能？

我的代码如下：

package com.nick.militarycounter;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import com.facebook.FacebookAuthorizationException;
import com.facebook.FacebookOperationCanceledException;
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.ProfilePictureView;

public class RegisterActivity extends Activity {

private static final String TAG = "RegisterActivity";
private LoginButton loginButton;
private EditText editTextAccount;
private EditText editTextEnterDate;
private Button button1;
private EditText editTextPassword;
private EditText editTextDiscountDays;
private ProfilePictureView facebookProfilePic;
UiLifecycleHelper uiHelper;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.register_activity);

    loginButton = (LoginButton) findViewById(R.id.login_button);
    editTextAccount = (EditText) findViewById(R.id.editText_account);
    editTextEnterDate = (EditText) findViewById(R.id.editText_enterDate);
    button1 = (Button) findViewById(R.id.button1);
    editTextPassword = (EditText) findViewById(R.id.editText_password);
    editTextDiscountDays = (EditText) findViewById(R.id.editText_discountDays);
    facebookProfilePic = (ProfilePictureView) findViewById(R.id.facebook_profile_pic);
    textView_userName = (TextView) findViewById(R.id.textview_loginStatus);

    uiHelper = new UiLifecycleHelper(this, FBLoginCallback);
    uiHelper.onCreate(savedInstanceState);

    loginButton = (LoginButton) findViewById(R.id.login_button);
    loginButton
            .setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
                @Override
                public void onUserInfoFetched(GraphUser user) {
                    RegisterActivity.this.mUser = user;
                }
            });

    // Find the user's profile picture custom view
    ProfilePictureView profilePictureView = (ProfilePictureView) findViewById(R.id.facebook_profile_pic);
    profilePictureView.setCropped(true);

}

ProfilePictureView profilePictureView;
GraphUser mUser;
TextView textView_userName;

// The "callback" defined how to handle the login result.
private Session.StatusCallback FBLoginCallback = new Session.StatusCallback() {
    @Override
    public void call(Session session, SessionState state,
            Exception exception) {
        // Failed
        if ((exception instanceof FacebookOperationCanceledException || exception instanceof FacebookAuthorizationException)) {
            new AlertDialog.Builder(RegisterActivity.this).setTitle("取消")
                    .setMessage("登入失敗!").setPositiveButton("ok", null)
                    .show();
            textView_userName.setText("登入失敗");

        } // Successed
        else if (state.isClosed()) {
            textView_userName.setText("請按登入鍵登入");
            // should reset image of profilePictureView HERE!
        } else {
            textView_userName.setText("登入中...");
            makeMeRequest(session);
        }

    }
};

/**
 * Set the user name and image
 * 
 * @param session
 */
private void makeMeRequest(final Session session) {
    // Make an API call to get user data and define a
    // new callback to handle the response.
    Request request = Request.newMeRequest(session,
            new Request.GraphUserCallback() {
                @Override
                public void onCompleted(GraphUser user, Response response) {
                    // If the response is successful
                    if (session == Session.getActiveSession()) {
                        if (user != null) {
                            mUser = user;
                            facebookProfilePic.setProfileId(user.getId());
                            textView_userName.setText(user.getName());
                        }
                    }
                    if (response.getError() != null) {
                        // Handle errors, will do so later.

                    }
                }
            });
    request.executeAsync();
}

@Override
protected void onResume() {
    super.onResume();
    uiHelper.onResume();
    Log.d(TAG, " onResume");

    // 這個是用來檢查是不是由facebook中notification連結而來
    // 同時讀取相關的資訊
    // checkReceivedRequest();

    loginButton = (LoginButton) findViewById(R.id.login_button);
    loginButton
            .setUserInfoChangedCallback(new LoginButton.UserInfoChangedCallback() {
                @Override
                public void onUserInfoFetched(GraphUser user) {
                    RegisterActivity.this.mUser = user;
                }
            });

    // Find the user's profile picture custom view
    profilePictureView = (ProfilePictureView) findViewById(R.id.facebook_profile_pic);
    profilePictureView.setCropped(true);

}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    uiHelper.onSaveInstanceState(outState);
    Log.d(TAG, "onSaveInstanceState");
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Log.d(TAG, "onActivityResult");
    uiHelper.onActivityResult(requestCode, resultCode, data);
}

@Override
public void onPause() {
    super.onPause();
    uiHelper.onPause();
    Log.d(TAG, "onPause");
}

@Override
public void onDestroy() {
    super.onDestroy();
    uiHelper.onDestroy();
    Log.d(TAG, "onDestroy");
}

}

提前致谢！

4

3 回答 3

3

请试试 ：

 // Remaining above code :
    else if (state.isClosed()) {
        textView_userName.setText("請按登入鍵登入");
        // should reset image of profilePictureView HERE!
        profilePictureView.setImageBitmap(null);

    } else {
        textView_userName.setText("登入中...");
        makeMeRequest(session);
    }

}

或使用以下方法：

public final void setDefaultProfilePicture(Bitmap inputBitmap)

ProfilePictureView 将在加载指定的配置文件时显示提供的图像，或者如果指定的配置文件不可用。参数 inputBitmap 在加载实际配置文件之前要渲染的位图。

于 2013-09-04T05:22:19.913 回答
1

我跟踪 profilePictureView 并使 setBlankProfilePicture() 成为公共函数！

setBlankProfilePicture() 将图像设置回默认图像。

但是，profilePictureView 再次登录后不会刷新...

必须重新启动 Activity 才能将图像加载到 profilePictureView。

于 2013-09-04T08:50:38.853 回答
1

将 ProfileId 设置为 null 以在注销后将个人资料图片重置为默认视图。

例子：

profilePicture.setProfileId(null);

于 2014-05-28T04:55:01.613 回答