Poprawki w Projekt 3

Projekt3/.idea/gradle.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

Projekt3/app/src/main/java/com/example/projekt3/MainActivity.java

@@ -13,9 +13,11 @@ import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 
 import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 
 public class MainActivity extends AppCompatActivity {
     private static final String TAG = "MainActivity";
+    private static final DateTimeFormatter FORMAT_DATY = DateTimeFormatter.ofPattern("d.M.yyyy HH:mm:ss");
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -29,14 +31,15 @@ public class MainActivity extends AppCompatActivity {
         });
     }
 
+    // metoda, którą wskauzjemy w onClick, musi być publiczna i przyjmować parametr typu View
     public void klik1(View view) {
         Toast.makeText(this, "Hej, tu guzik 1", Toast.LENGTH_LONG).show();
         Log.d(TAG, "klik1: tak, tak, działa");
     }
 
     public void pokazCzas(View view) {
-        String dt = LocalDateTime.now().toString();
-        TextView textView = findViewById(R.id.textView);
+        String dt = LocalDateTime.now().format(FORMAT_DATY);
+        TextView textView = findViewById(R.id.textViewMain);
         textView.setText(dt);
     }
 }
\ No newline at end of file

Projekt3/app/src/main/res/layout/activity_main.xml

@@ -8,7 +8,7 @@
     tools:context=".MainActivity">
 
     <TextView
-        android:id="@+id/textView"
+        android:id="@+id/textViewMain"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!"
@@ -19,7 +19,7 @@
         app:layout_constraintVertical_bias="0.3" />
 
     <Button
-        android:id="@+id/button"
+        android:id="@+id/button1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="16dp"
@@ -27,7 +27,7 @@
         android:onClick="klik1"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/textView" />
+        app:layout_constraintTop_toBottomOf="@+id/textViewMain" />
 
     <Button
         android:id="@+id/button2"
@@ -38,6 +38,6 @@
         android:text="Pokaż czas"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/button" />
+        app:layout_constraintTop_toBottomOf="@+id/button1" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file