Android studio: Button onClick() not working

Question

I have two buttons on my main Activity, which both should lead to another activity, but when I press my button, it doesn't change anything.

I have all three activities in my manifest:

 <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".UserActivity"
        android:label="@string/app_name">
    </activity>
    <activity
        android:name=".ModeratorActivity"
        android:label="@string/app_name">
    </activity>

Method for the two buttons in my main activity:

private void setUserTypeOnButtonClick(){
    Button userButton = findViewById(R.id.button_user);
    Button moderatorButton = findViewById(R.id.button_moderator);

    userButton.setOnClickListener(new View.OnClickListener(){

        public void onClick(View v){
            System.out.println("Clicked userbutton");
            Intent newActivity = new Intent(v.getContext(), UserActivity.class);
            startActivity(newActivity);
        }
    });


    moderatorButton.setOnClickListener(new View.OnClickListener(){

        public void onClick(View v){
            System.out.println("Clicked moderatorbutton");
            Intent newActivity = new Intent(v.getContext(), ModeratorActivity.class);
            startActivity(newActivity);
        }
    });
}

What is the problem here? Did I leave something out?

Answer 1

Edit : Solution is just to
call setUserTypeOnButtonClick() inside onCreate() method

@Override
protected void onCreate(Bundle savedInstanceState) {
    System.out.println("Created activity_main");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    setUserTypeOnButtonClick();
}

Answer 2

You forgot to call the setUserTypeOnButtonClick() method after setContentView() in onCreate() .

The setContentView() does make the buttons visible but there is no click listener binding taking place, and hence the buttons don't do anything.

Answer 3

您只需在onCreate方法中调用setUserTypeOnButtonClick()

Answer 4

您只是忘记了在onCreate（）中调用setUserTypeOnButtonClick()方法

Answer 5

• You forget to call the method getUserTypeOnButtonClick().
• ToggleButton cannot cast to Button.
• And also ModeratorActivity and UserActivity OnBackPressed just call finish().