Load new page on button click in android?

Question

I am making a game in android. I want to make a main menu screen that has two buttons, one to start the game and one to display the how to screen.

I have classes for both, but when I launch my name and test the buttons, the application crashes. Could someone please tell me what is wrong with my code?

       public void launch()
       {
            Intent i = new Intent();
            i.setClassName("com.testing.blockinvasion", "com.testing.blockinvasion.game");
            startActivity(i);
       }

       public void howto()
       {
            Intent i = new Intent();
            i.setClassName("com.testing.blockinvasion", "com.testing.blockinvasion.howto");
            startActivity(i);
       }

}

My buttons are defined in my main.xml:

 <Button
     android:layout_height="wrap_content"
     android:layout_width="wrap_content"
     android:text="@string/Start"
     android:onClick="launch" />

EDIT: I ended up just deleting the project and starting another one and everything seems to work fine now.

Waqas is correct. If you specify the listener functions using the `android:onClick` attribute then the functions must accept a `View` parameter. — Squonk, Feb 04 '12 at 21:14

score 2 · Answer 1 · answered Feb 04 '12 at 21:10

2

You need to correct your method signatures. So do it in this way:

public void launch(View v)

and

public void howto(View v)

answered Feb 04 '12 at 21:10

waqaslam

67,549
16
165
178

does it still Force Close? if not, then now its a different issue... post your logs for that – waqaslam Feb 04 '12 at 21:31
My logs say that the function launch for example is not found – Parth Feb 04 '12 at 22:35
you must be doing something else wrong. paste your entire code – waqaslam Feb 04 '12 at 22:38
clean your project and build again. besides paste your logs from logcat – waqaslam Feb 04 '12 at 22:57
Cleaning and re-build didn't change anything – Parth Feb 04 '12 at 23:37
its strange. your code seems fine to me. comment everything inside your button methods and just print a log message to check if the button action is working – waqaslam Feb 04 '12 at 23:59
How do I print a log message? – Parth Feb 05 '12 at 00:02
Log.i("btnLaunch", "launch button is clicked"); – waqaslam Feb 05 '12 at 00:04
I can't see the log. Where specifically should I look. I cannot see it in the Console or in LogCat – Parth Feb 05 '12 at 00:13
http://stackoverflow.com/questions/2250112/why-doesnt-logcat-show-anything-in-my-android – waqaslam Feb 05 '12 at 00:39
I dont understand what that link is asking of me – Parth Feb 05 '12 at 21:09
I'm getting a "nosuchmethod" exception – Parth Feb 05 '12 at 21:52

score 0 · Answer 2 · answered Feb 04 '12 at 21:11

0

Try it this way:

private OnClickListener button1Listener = new OnClickListener() { public void onClick(View v) { Intent howto = new Intent(getApplicationContext(), .class); startActivity(howto); } };

Assigning a different OnClickListener object to every button --> button1.setOnClickListener(button1Listener)

Anyway, are all the Activities defined in the AndroidManifest.xml?

answered Feb 04 '12 at 21:11

Dhanesh Budhrani

190
3
15

Initially, I had not defined my activities, but now I have and it still does not load (it prompts me to force close the application) – Parth Feb 04 '12 at 22:36

Load new page on button click in android?

2 Answers2

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