我退出菜单活动后,代码崩溃了,它打开了徽标活动,但它不起作用,并在此之后立即停止工作
else if (id == R.id.nav_sair) {
AlertDialog.Builder builder=new AlertDialog.Builder(RealMenuActivity.this); //Home is name of the activity
builder.setMessage("Deseja sair?");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
finish();
Intent i=new Intent(RealMenuActivity.this, LogoActivity.class);
i.putExtra("finish", true);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // To clean up all activities
//startActivity(i);
startActivity( i );
FirebaseAuth.getInstance().signOut();
finish();
return;
}
});
这是徽标活动,我认为错误在这里,但是我不确定
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener firebaseAuthListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_logo );
mAuth = FirebaseAuth.getInstance();
firebaseAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
Intent it = new Intent( LogoActivity.this, RealMenuActivity.class );
startActivity( it );
finish();
return;
}
}
};
mEmail = (EditText) findViewById( R.id.Email );
mPassword = (EditText) findViewById( R.id.Password );
mbtnLogin = (ImageButton) findViewById( R.id.loginButton );
mRegistro = (Button) findViewById( R.id.Registro );
mRegistro.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent it = new Intent(LogoActivity.this, RegistroActivity.class);
startActivity(it);
}
} );
mbtnLogin.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View v) {
final String Email = mEmail.getText().toString();
final String Password = mPassword.getText().toString();
mAuth.signInWithEmailAndPassword( Email, Password).addOnCompleteListener( LogoActivity.this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (!task.isSuccessful()){
Toast.makeText( LogoActivity.this, "Erro ao Entrar. Tente novamente", Toast.LENGTH_SHORT ).show();
}
}
} );
}
} );
}
@Override
public void onClick(View v) {
}
@Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener( firebaseAuthListener );
}
@Override
protected void onStop() {
super.onStop();
if (firebaseAuthListener != null) {
mAuth.removeAuthStateListener(firebaseAuthListener);
FirebaseAuth.getInstance().signOut();
}
}
}
打开徽标活动后立即崩溃!很快我将添加logcat! sb可以帮助我吗?谢谢!
Logcat
java.lang.RuntimeException:无法停止活动{com.example.norio.amosou / com.example.norio.amosou.RealMenuActivity}:java.lang.NullPointerException:尝试调用虚拟方法'java.lang.String com.google .firebase.auth.FirebaseUser.getUid()在android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4331)在android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4393)在NULL。 android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1618)上的.ActivityThread.wrap6(ActivityThread.java)android.os.Looper.loop上的android.os.Handler.dispatchMessage(Handler.java:110) (Looper.java:203)在android.app.ActivityThread.main(ActivityThread.java:6339)在java.lang.reflect.Method.invoke(本机方法)在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:1084)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:945)原因:java.lang.NullPointerException:尝试调用虚拟方法 android.app.Instrumentation上com.example.norio.amosou.RealMenuActivity.onStop(RealMenuActivity.java:472)上的空对象引用上的'java.lang.String com.google.firebase.auth.FirebaseUser.getUid()' .callActivityOnStop(Instrumentation.java:1311)在android.app.Activity.performStop(Activity.java:6864)
原因是您在onclick中执行了2 finish()
@Override
public void onClick(DialogInterface dialog, int id) {
finish();
Intent i=new Intent(RealMenuActivity.this, LogoActivity.class);
i.putExtra("finish", true);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // To clean up all activities
//startActivity(i);
startActivity( i );
FirebaseAuth.getInstance().signOut();
finish();
只需删除第一个,因为您在访问意图和登出之前正在杀死活动
@Override
public void onClick(DialogInterface dialog, int id) {
Intent i=new Intent(RealMenuActivity.this, LogoActivity.class);
i.putExtra("finish", true);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // To clean up all activities
//startActivity(i);
startActivity( i );
FirebaseAuth.getInstance().signOut();
finish();