Question

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/bg"
    android:fitsSystemWindows="true">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="56dp"
        android:paddingLeft="24dp"
        android:paddingRight="24dp"
        android:weightSum="1">

        <ImageView android:src="@drawable/logo"
            android:layout_width="wrap_content"
            android:layout_height="100dp"
            android:layout_marginBottom="24dp"
            android:layout_gravity="center_horizontal" />

        <!-- Email Label -->
        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp">
            <EditText android:id="@+id/input_email"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textEmailAddress"
                android:hint="Email" />
        </android.support.design.widget.TextInputLayout>

        <!-- Password Label -->
        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp">
            <EditText android:id="@+id/input_password"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textPassword"
                android:hint="Password"/>
        </android.support.design.widget.TextInputLayout>

        <android.support.v7.widget.AppCompatButton
            android:id="@+id/btn_login"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="24dp"
            android:layout_marginBottom="24dp"
            android:padding="12dp"
            android:text="Login"

            android:background="@drawable/nice_button"

            android:textColor="@android:color/white"
            android:textSize="18sp"
            android:shadowRadius="1"
            android:shadowDx="1"
            android:shadowDy="1"
            android:shadowColor="@android:color/black"/>

        <com.facebook.login.widget.LoginButton
            android:id="@+id/login_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="10dp"
            android:layout_marginBottom="30dp" />

        <TextView android:id="@+id/link_signup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="24dp"
            android:text="No account yet? Create one"
            android:gravity="center"
            android:textSize="16dip"/>


    </LinearLayout>
</ScrollView>

我正在尝试按照教程将Facebook登录添加到我的应用程序中。我收到了这个错误。我在互联网上搜索但没有得到任何解决方案。我指出问题出在XML文件Facebook按钮小部件中。

05-14 00:59:52.399 28057-28057/com.donateblood.blooddonation E/AndroidRuntime: FATAL EXCEPTION: main
   Process: com.donateblood.blooddonation, PID: 28057
   java.lang.ExceptionInInitializerError
   at java.lang.reflect.Constructor.newInstance(Native Method)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
   at android.view.LayoutInflater.createView(LayoutInflater.java:607)
   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
   at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
   at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
   at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
   at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
   at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
   at com.donateblood.blooddonation.LoginActivity.onCreate(LoginActivity.java:87)
   at android.app.Activity.performCreate(Activity.java:5958)
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
   at android.app.ActivityThread.access$800(ActivityThread.java:144)
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:155)
   at android.app.ActivityThread.main(ActivityThread.java:5696)
   at java.lang.reflect.Method.invoke(Native Method)
   at java.lang.reflect.Method.invoke(Method.java:372)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
Caused by: null
   at com.facebook.internal.Validate.sdkInitialized(Validate.java:99)
   at com.facebook.FacebookSdk.getCallbackRequestCodeOffset(FacebookSdk.java:735)
   at com.facebook.internal.CallbackManagerImpl$RequestCodeOffset.toRequestCode(CallbackManagerImpl.java:109)
   at com.facebook.login.widget.LoginButton.<clinit>(LoginButton.java:58)
   at java.lang.reflect.Constructor.newInstance(Native Method) 
   at java.lang.reflect.Constructor.newInstance(Constructor.java:288) 
   at android.view.LayoutInflater.createView(LayoutInflater.java:607) 
   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743) 
   at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
   at android.view.LayoutInflater.rInflate(LayoutInflater.java:809) 
   at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
   at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
   at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
   at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256) 
   at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109) 
   at com.donateblood.blooddonation.LoginActivity.onCreate(LoginActivity.java:87) 
   at android.app.Activity.performCreate(Activity.java:5958) 
   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129) 
   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 
   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474) 
   at android.app.ActivityThread.access$800(ActivityThread.java:144) 
   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359) 
   at android.os.Handler.dispatchMessage(Handler.java:102) 
   at android.os.Looper.loop(Looper.java:155) 
   at android.app.ActivityThread.main(ActivityThread.java:5696) 
   at java.lang.reflect.Method.invoke(Native Method) 
   at java.lang.reflect.Method.invoke(Method.java:372) 
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028) 
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

package com.donateblood.blooddonation;

import android.os.AsyncTask;
import android.os.Bundle;

import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import butterknife.ButterKnife;
import butterknife.InjectView;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;

import com.facebook.Profile;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;

public class LoginActivity extends AppCompatActivity {
    private static final String TAG = "LoginActivity";
    private static final int REQUEST_SIGNUP = 0;
    DB db;
    DBCursor cursor;
    GPSTracker gps ;
    DBCollection collection;
    Database dataobj = new Database();
    public static String email;
    public static String password;
    private CallbackManager mcallbackManager;

    private FacebookCallback<LoginResult>  mcallbackk = new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            AccessToken accss = loginResult.getAccessToken();
            Profile prof = Profile.getCurrentProfile();
            Intent intent = new Intent(getApplicationContext(), MainGUI.class);
            startActivity(intent);
            finish();

        }

        @Override
        public void onCancel() {

        }

        @Override
        public void onError(FacebookException error) {

        }
    };
    @InjectView(R.id.input_email) EditText _emailText;
    @InjectView(R.id.input_password) EditText _passwordText;
    @InjectView(R.id.btn_login) Button _loginButton;
    @InjectView(R.id.link_signup) TextView _signupLink;
    //GPSTracker gps;

    //public static Button myloc;
  // public static TextView myTxt;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        LoginButton fbLogin = (LoginButton) findViewById(R.id.login_button);
        ButterKnife.inject(this);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

       FacebookSdk.sdkInitialize(LoginActivity.this);
        mcallbackManager = CallbackManager.Factory.create();

        fbLogin.registerCallback(mcallbackManager,mcallbackk);

      // myloc = (Button) findViewById(R.id.loc);
       // myTxt= (TextView) findViewById(R.id.text);

     /*   myloc.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
               // Intent intent = new Intent(getApplicationContext(), LoginActivity.class);
                gps=new GPSTracker(LoginActivity.this);
            }
        }); */
        _loginButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                AsyncLogin LoginThread = new AsyncLogin();
                LoginThread.execute();
            }
        });
        fbLogin.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

            }
        });
        _signupLink.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), SignupActivity.class);
                startActivityForResult(intent, REQUEST_SIGNUP);
            }
        });
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(item.getItemId()==android.R.id.home){
            finish();
        }
        return super.onOptionsItemSelected(item);
    }

    public class AsyncLogin extends AsyncTask<Void,Void,Void> {
        public boolean flag =false;
        private ProgressDialog pDialog;
        @Override
        protected Void doInBackground(Void... voids) {
            login();
            return null;
        }
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            if (!validate()) {
                onLoginFailed();
                return;
            }
            _loginButton.setEnabled(false);
            pDialog = new ProgressDialog(LoginActivity.this);
            pDialog.setMessage("Authenticating...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            pDialog.dismiss();

            if(flag==true){
                Toast.makeText(getBaseContext(), "Login Successfully", Toast.LENGTH_LONG).show();
            onLoginSuccess();
            }
            if(flag==false){
                onLoginFailed();
            }
        }
        public void login() {
            email = _emailText.getText().toString();
            password = _passwordText.getText().toString();
            db = dataobj.getconnection();
            collection= db.getCollection("UserDetails");
            BasicDBObject query = new BasicDBObject();
            query.put("email", email);
            query.put("password", password);
            cursor = collection.find(query);
            if(cursor.hasNext()){
                flag=true;
            }
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode,resultCode,data);
        mcallbackManager.onActivityResult(requestCode,resultCode,data);
        if (requestCode == REQUEST_SIGNUP) {
            if (resultCode == RESULT_OK) {

                // TODO: Implement successful signup logic here
                // By default we just finish the Activity and log them in automatically
                this.finish();
            }
        }
    }

   /* @Override
    public void onBackPressed() {
        // disable going back to the MainActivity
        moveTaskToBack(true);
    }*/

    public void onLoginSuccess() {
        _loginButton.setEnabled(true);
        gps=new GPSTracker(LoginActivity.this);
        Intent intent = new Intent(getApplicationContext(), MainGUI.class);
        startActivity(intent);
        finish();
    }

    public void onLoginFailed() {
        Toast.makeText(getBaseContext(), "Login failed. Incorrect credentials", Toast.LENGTH_LONG).show();
        _loginButton.setEnabled(true);
    }

    public boolean validate() {
        boolean valid = true;

        String email = _emailText.getText().toString();
        String password = _passwordText.getText().toString();

        if (email.isEmpty() || !android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
            _emailText.setError("Enter a valid email address");
            valid = false;
        } else {
            _emailText.setError(null);
        }

        if (password.isEmpty()) {
            _passwordText.setError("Enter password");
            valid = false;
        } else {
            _passwordText.setError(null);
        }

        return valid;
    }
}

Answer 1

FacebookSdk.sdkInitialize();

必须从您的Application类调用它，而不是您的Activity。根据{{3}}：

sdkInitialize（Context，int）

此功能初始化Facebook SDK，Facebook的行为   如果未调用此函数，则SDK函数未确定。它   应该尽早打电话。

java.lang.ExceptionInInitializerError由null引起

1 个答案: