Приложение Java Android быстро закрывается после открытия - PullRequest
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Приложение Java Android быстро закрывается после открытия

0 голосов
/ 24 октября 2019

Некоторое время назад у меня был основной экран входа в систему / регистрации и рабочий ящик, но когда я пытался реализовать базу данных элементов, какой класс при этом я не создавал и не вызывал нигде, все равно приложение перестало работать, оноОткрываясь и быстро закрываясь, мобильное устройство сообщало бы, что «приложение представляет постоянные сбои» даже без изменения бизнес-правил или модели.

Это моя операция запуска MainActivity, которая представляет собой вход в систему 

package com.example.appteste;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;

import com.example.appteste.ui.login.LoginActivity;
import com.github.mikephil.charting.charts.PieChart;
import com.github.mikephil.charting.data.PieData;
import com.github.mikephil.charting.data.PieDataSet;
import com.github.mikephil.charting.data.PieEntry;
import com.github.mikephil.charting.utils.ColorTemplate;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.UserProfileChangeRequest;

import java.util.ArrayList;

import lecho.lib.hellocharts.model.PieChartData;

import static android.content.ContentValues.TAG;

public class MainActivity extends AppCompatActivity {



    private FirebaseAuth mAuth;
//    private PieChart pieChart;w

    final Button signUpButton = findViewById(R.id.createUserButton);
    final EditText displayNameEditText =  findViewById(R.id.name_field);
    final EditText usernameEditText = findViewById(R.id.mail_field);
    final EditText passwordEditText = findViewById(R.id.password_field);
    final Button login = findViewById(R.id.login);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // sets the .xml current view
        setContentView(R.layout.activity_sign_in);
        // pie start
//        pieChart = findViewById(R.id0
//         pie end
//        getEntries();

        // declarations
        mAuth = FirebaseAuth.getInstance();

        signUpButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // calls createAccount
                createAccount(displayNameEditText.getText().toString(), usernameEditText.getText().toString(), passwordEditText.getText().toString());


                // logs in the system that
                Log.v("signUp", "UserSignedUp:"+ usernameEditText.getText().toString() + "password: " + passwordEditText.getText().toString());
                // Logs in the created user
                mAuth.signInWithEmailAndPassword(usernameEditText.getText().toString(),
                        passwordEditText.getText().toString())
                        .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                            @Override
                            public void onComplete(@NonNull Task<AuthResult> task) {
                                if (task.isSuccessful()) {
//                                    startActivity(new Intent(MainActivity.this, MenuActivity.class));
                                    startActivity(new Intent(MainActivity.this, HomeActivity.class));
                                } else {
                                    Toast.makeText(MainActivity.this, task.getException().getMessage(), Toast.LENGTH_LONG).show();
                                }
                            }
                        });
                // supposed to show a welcome message
//                updateUiWithUser(mAuth.getCurrentUser());
                // shows message to user? maybe?
                Toast.makeText(MainActivity.this, "Register Succeed.",
                        Toast.LENGTH_SHORT).show();
            }
        });

        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // change to Login screen
                startActivity(new Intent(MainActivity.this, LoginActivity.class));
            }
        });
    }



    public void createAccount(final String displayName, String email, String password) {
        mAuth.createUserWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {

                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "createUserWithEmail:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            // sets the display Name for the user
                            user.updateProfile(new UserProfileChangeRequest.Builder().setDisplayName(displayName).build());
                            startActivity(new Intent(MainActivity.this, LoginActivity.class));
                            updateUiWithUser();
                        } else {
                            // If sign in fails, display a mcessage to the user.
                            Log.w(TAG, "createUserWithEmail:failure", task.getException());
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
//                            updateUiWithUser(null);
                        }

                        // TODO discover what to add here
                    }
                });
    }


    private void updateUiWithUser(FirebaseUser model) {
        String welcome = getString(R.string.welcome) + model.getDisplayName();
        // TODO : initiate successful logged in experience
        Toast.makeText(getApplicationContext(), welcome, Toast.LENGTH_LONG).show();
    }
    private void updateUiWithUser() {
        String welcome = getString(R.string.welcome) + mAuth.getCurrentUser().getDisplayName();
        // TODO : initiate successful logged in experience
        Toast.makeText(getApplicationContext(), welcome, Toast.LENGTH_LONG).show();
    }
}

LoginActivity (куда идет MainActivity после регистрации) 

package com.example.appteste.ui.login;

import android.app.Activity;

import androidx.annotation.NonNull;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProviders;

import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.annotation.StringRes;
import androidx.appcompat.app.AppCompatActivity;

import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.example.appteste.HomeActivity;
import com.example.appteste.MenuActivity;
import com.example.appteste.R;
import com.example.appteste.ui.login.LoginViewModel;
import com.example.appteste.ui.login.LoginViewModelFactory;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

import static android.content.ContentValues.TAG;

public class LoginActivity extends AppCompatActivity {

    private LoginViewModel loginViewModel;
    private FirebaseAuth mAuth;
    private LoginResult login;

    public LoginResult getLogin() {
        return login;
    }

    public void setLogin(LoginResult login) {
        this.login = login;
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        loginViewModel = ViewModelProviders.of(this, new LoginViewModelFactory())
                .get(LoginViewModel.class);

        final EditText usernameEditText = findViewById(R.id.username);
        final EditText passwordEditText = findViewById(R.id.password);
        final Button loginButton = findViewById(R.id.login);
        final ProgressBar loadingProgressBar = findViewById(R.id.loading);

        mAuth = FirebaseAuth.getInstance();

        loginViewModel.getLoginFormState().observe(this, new Observer<LoginFormState>() {
            @Override
            public void onChanged(@Nullable LoginFormState loginFormState) {
                if (loginFormState == null) {
                    return;
                }
                loginButton.setEnabled(loginFormState.isDataValid());
                if (loginFormState.getUsernameError() != null) {
                    usernameEditText.setError(getString(loginFormState.getUsernameError()));
                }
                if (loginFormState.getPasswordError() != null) {
                    passwordEditText.setError(getString(loginFormState.getPasswordError()));
                }
            }
        });

        loginViewModel.getLoginResult().observe(this, new Observer<LoginResult>() {
            @Override
            public void onChanged(@Nullable LoginResult loginResult) {
                if (loginResult == null) {
                    return;
                }
                loadingProgressBar.setVisibility(View.GONE);
                if (loginResult.getError() != null) {
                    setLogin(loginResult);
                    showLoginFailed(loginResult.getError());
                }
                if (loginResult.getSuccess() != null) {
//                    updateUiWithUser(loginResult.getSuccess());


                }
                setResult(Activity.RESULT_OK);

                //Complete and destroy login activity once successful
                finish();
            }
        });

        TextWatcher afterTextChangedListener = new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                // ignore
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // ignore
            }

            @Override
            public void afterTextChanged(Editable s) {
                loginViewModel.loginDataChanged(usernameEditText.getText().toString(),
                        passwordEditText.getText().toString());
            }
        };
        usernameEditText.addTextChangedListener(afterTextChangedListener);
        passwordEditText.addTextChangedListener(afterTextChangedListener);
        passwordEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {

            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_DONE) {
                    loginViewModel.login(usernameEditText.getText().toString(),
                            passwordEditText.getText().toString());
                }
                return false;
            }
        });

        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAuth.signInWithEmailAndPassword(usernameEditText.getText().toString(),
                        passwordEditText.getText().toString())
                        .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            updateUiWithUser(mAuth.getCurrentUser());
//                            startActivity(new Intent(LoginActivity.this, MenuActivity.class));
                            startActivity(new Intent(LoginActivity.this, HomeActivity.class));
                        } else {
                            Toast.makeText(LoginActivity.this, task.getException().getMessage(), Toast.LENGTH_LONG).show();
                        }
                    }
                });
            }
        });

    }

    // [START on_start_check_user]
    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
//        updateUiWithUser(getLogin().getSuccess());
        updateUiWithUser(currentUser);
    }
    // [END on_start_check_user]




    private void updateUiWithUser(FirebaseUser user) {
        String welcome = getString(R.string.welcome) + user.getDisplayName();
        // TODO : initiate successful logged in experience
        Toast.makeText(getApplicationContext(), welcome, Toast.LENGTH_LONG).show();
    }

    private void showLoginFailed(@StringRes Integer errorString) {
        Toast.makeText(getApplicationContext(), errorString, Toast.LENGTH_SHORT).show();
    }


}

мой logcat: 

2019-10-24 16:39:39.723 711-711/? E/Zygote: isWhitelistProcess - Process is Whitelisted
2019-10-24 16:39:39.723 711-711/? E/Zygote: accessInfo : 1
2019-10-24 16:39:40.209 711-711/com.example.appteste E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.appteste, PID: 711
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.appteste/com.example.appteste.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3019)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3256)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1947)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7037)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.pm.ApplicationInfo android.content.Context.getApplicationInfo()' on a null object reference
        at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:164)
        at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:157)
        at android.content.Context.obtainStyledAttributes(Context.java:677)
        at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:692)
        at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:659)
        at androidx.appcompat.app.AppCompatDelegateImpl.findViewById(AppCompatDelegateImpl.java:479)
        at androidx.appcompat.app.AppCompatActivity.findViewById(AppCompatActivity.java:214)
        at com.example.appteste.MainActivity.<init>(MainActivity.java:42)
        at java.lang.Class.newInstance(Native Method)
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:41)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1215)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3007)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3256) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1947) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7037) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:965)

Ответы [ 2 ]

0 голосов
/ 25 октября 2019

Вы пытаетесь раздуть свои взгляды при инициализации класса, а не в соответствующем методе жизненного цикла. Как предложил ANDRE OLIVERA, переместите 

final Button signUpButton = findViewById(R.id.createUserButton);
final EditText displayNameEditText =  findViewById(R.id.name_field);
final EditText usernameEditText = findViewById(R.id.mail_field);
final EditText passwordEditText = findViewById(R.id.password_field);
final Button login = findViewById(R.id.login);

Внутри onCreate чуть ниже setContentView(R.layout.activity_sign_in);, что является методом, который раздувает макет.

0 голосов
/ 24 октября 2019 
 Button signUpButton;
EditText displayNameEditText;
EditText usernameEditText;
EditText passwordEditText;
Button login;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // sets the .xml current view
    setContentView(R.layout.activity_sign_in);

    signUpButton = findViewById(R.id.createUserButton);
    displayNameEditText =  findViewById(R.id.name_field);
    usernameEditText = findViewById(R.id.mail_field);
    passwordEditText = findViewById(R.id.password_field);
    login = findViewById(R.id.login);
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