Android: Go to another activity onclick button

Question

I add this in my MainActivity.java

btn = (Button)findViewById(R.id.aboutTheDeveloper);

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void openAboutTheDeveloper(View v) {
        startActivity(new Intent(MainActivity.this, aboutTheDeveloper.class));
    }
}

I have also edited my manifests:

    <activity
        android:name=".aboutTheDeveloper"
        android:label="@string/title_activity_about_the_developer" >
    </activity>

Scenario:

I have this button inside MainActivity.xml with id = @id/openAboutTheDeveloper

Which should open the AboutTheDeveloper Activity.

Inside button I also placed android:onclick="openAboutTheDeveloper"

Which should call function openAboutTheDeveloper inside MainActivity.java

It doesn't seem to work. T_T

Sorry if I'm too explicit. I'm very new to Android and I'm not really friends with Java.

Duplicate : http://stackoverflow.com/questions/5152564/calling-one-activity-from-another-in-android — Actiwitty, Aug 28 '15 at 18:37
What error are you getting? Also please post openAboutTheDeveloper code — Want2bExpert, Aug 28 '15 at 18:40

score 5 · Answer 1 · answered Aug 28 '15 at 18:39

you can't have

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void openAboutTheDeveloper(View v) {
        startActivity(new Intent(MainActivity.this, aboutTheDeveloper.class));
    }
}

The View.OnClickListener interface has no public void openAboutTheDeveloper(View v) method, but public void onClick(View v). You can either change your onClickListener like

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        startActivity(new Intent(MainActivity.this, aboutTheDeveloper.class));
    }
}

removing the android:onclick property from your xml, or you get rid of that code, and add a method inside MainActivity

public void openAboutTheDeveloper(View v) {
        startActivity(new Intent(MainActivity.this, aboutTheDeveloper.class));
}

the property android:onclick let you declare a handler that will be invoked at runtime. The method will be resolved with the reflection and if it is not found, Android throws an exception

Wow! Thanks @Blackbelt. I retained the onClick = "openAboutTheDeveloper" and added the method openAboutTheDeveloper() — Kinna P, Aug 28 '15 at 18:56

Android: Go to another activity onclick button

1 Answers1