【发布时间】：2023-03-27 11:35:02
【问题描述】：
我开始了解如何通过 facebook 进行用户登录。在我的代码中有带有 FB 登录按钮的单一布局。当用户单击它时，它会打开 facebook 访问页面，并在成功登录时显示与个人资料图片和名称相同的布局。我想获取电子邮件 ID 和 Facebook 用户 ID 并将其保存到本地数据库，并在下次登录时检查数据库中的电子邮件 ID 以登录。这是因为，即使用户从设置中清除数据，用户也不必再次访问 Facebook 访问页面。它将搜索本地数据库并登录。
SQLite 数据库
public class SQLiteHandler extends SQLiteOpenHelper {
private static final String TAG = SQLiteHandler.class.getSimpleName();
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "android_api";
// Login table name
private static final String TABLE_USER = "user";
// Login Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_EMAIL = "email";
private static final String KEY_UID = "uid";
public SQLiteHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_USER + "("
+ KEY_ID + " INTEGER PRIMARY KEY,"
+ KEY_EMAIL + " TEXT UNIQUE," + KEY_UID + " TEXT"+")";
db.execSQL(CREATE_LOGIN_TABLE);
Log.d(TAG, "Database tables created");
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_USER);
// Create tables again
onCreate(db);
}
/**
* Storing user details in database
* */
public void addUser(String name, String email, String uid, String created_at) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_EMAIL, email); // Email
values.put(KEY_UID, uid); // Email
// Inserting Row
long id = db.insert(TABLE_USER, null, values);
db.close(); // Closing database connection
Log.d(TAG, "New user inserted into sqlite: " + id);
}
/**
* Getting user data from database
* */
public HashMap<String, String> getUserDetails() {
HashMap<String, String> user = new HashMap<String, String>();
String selectQuery = "SELECT * FROM " + TABLE_USER;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// Move to first row
cursor.moveToFirst();
if (cursor.getCount() > 0) {
user.put("email", cursor.getString(1));
user.put("uid", cursor.getString(2));
}
cursor.close();
db.close();
// return user
Log.d(TAG, "Fetching user from Sqlite: " + user.toString());
return user;
}
/**
* Re crate database Delete all tables and create them again
* */
public void deleteUsers() {
SQLiteDatabase db = this.getWritableDatabase();
// Delete All Rows
db.delete(TABLE_USER, null, null);
db.close();
Log.d(TAG, "Deleted all user info from sqlite");
}
}
主活动
public class MainActivity extends Activity {
CallbackManager callbackManager;
Button share,details;
ShareDialog shareDialog;
LoginButton login;
ProfilePictureView profile;
Dialog details_dialog;
TextView details_txt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_main);
callbackManager = CallbackManager.Factory.create();
login = (LoginButton)findViewById(R.id.login_button);
profile = (ProfilePictureView)findViewById(R.id.picture);
shareDialog = new ShareDialog(this);
share = (Button)findViewById(R.id.share);
details = (Button)findViewById(R.id.details);
login.setReadPermissions("public_profile email");
share.setVisibility(View.INVISIBLE);
details.setVisibility(View.INVISIBLE);
details_dialog = new Dialog(this);
details_dialog.setContentView(R.layout.dialog_details);
details_dialog.setTitle("Details");
details_txt = (TextView)details_dialog.findViewById(R.id.details);
details.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
details_dialog.show();
}
});
if(AccessToken.getCurrentAccessToken() != null){
RequestData();
share.setVisibility(View.VISIBLE);
details.setVisibility(View.VISIBLE);
}
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(AccessToken.getCurrentAccessToken() != null) {
share.setVisibility(View.INVISIBLE);
details.setVisibility(View.INVISIBLE);
profile.setProfileId(null);
}
}
});
share.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ShareLinkContent content = new ShareLinkContent.Builder().build();
shareDialog.show(content);
}
});
login.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
if(AccessToken.getCurrentAccessToken() != null){
RequestData();
share.setVisibility(View.VISIBLE);
details.setVisibility(View.VISIBLE);
}
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException exception) {
}
});
}
public void RequestData(){
GraphRequest request = GraphRequest.newMeRequest(AccessToken.getCurrentAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject object,GraphResponse response) {
JSONObject json = response.getJSONObject();
try {
if(json != null){
String text = "<b>Name :</b> "+json.getString("name")+"<br><br><b>Email :</b> "+json.getString("email")+"<br><br><b>Profile link :</b> "+json.getString("link");
details_txt.setText(Html.fromHtml(text));
profile.setProfileId(json.getString("id"));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
Bundle parameters = new Bundle();
parameters.putString("fields", "id,name,link,email,picture");
request.setParameters(parameters);
request.executeAsync();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}
}
【问题讨论】：
标签： android facebook android-sqlite