Привет. Нужно в потоке инкрементировать переменную и выводить на экран. Ошибка в методе самого вывода.
| Java |
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| import android.annotation.SuppressLint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button regionBtn, busterBtn;
ImageView imageView;
TextView traffic, count;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
Incrementer incrementer = new Incrementer();
incrementer.start();
}
void initView(){
regionBtn = findViewById(R.id.regions);
busterBtn = findViewById(R.id.busters);
imageView = findViewById(R.id.glavnaya_knopka);
traffic = findViewById(R.id.yavka);
count = findViewById(R.id.kolvo);
}
class Incrementer extends Thread{
MainActivity mainActivity = new MainActivity();
public int i = 0;
public String str = "";
@Override
public void run() {
i++;
try {
sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
str = Integer.toString(i);
mainActivity.count.setText(str);
}
}
} |
|
| XML |
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| <?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/glavnaya_knopka"
android:layout_width="150dp"
android:layout_height="220dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="@drawable/picture"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/yavka"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:gravity="center_horizontal"
android:textSize="25dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/kolvo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:gravity="center_horizontal"
android:textSize="25dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/yavka" />
<Button
android:id="@+id/regions"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginLeft="8dp" />
<Button
android:id="@+id/busters"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginRight="8dp" />
</android.support.constraint.ConstraintLayout> |
|
Лог ошибки:
| Java |
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| E/AndroidRuntime: FATAL EXCEPTION: Thread-4
Process: com.example.user.homework_elections, PID: 8173
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at com.example.user.homework_elections.MainActivity$Incrementer.run(MainActivity.java:53) |
|
Вроде банальный NullPointerException но в чём проблема не могу понять. Спасибо.
(
Сообщение от nsoznik
