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Asked: 2026-05-21T19:57:55+00:00

i would like to start a new activity according to the radiobutton that the

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i would like to start a new activity according to the radiobutton that the user choose.this is my non working code(i m using a toast message for now instead of a new activity)

public class cafechoice  extends Activity {   

    /** Called when the activity is first created. */
public RadioButton rb1;
public RadioButton rb2;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.cafechoice);

        final RadioButton rb1 = (RadioButton) findViewById(R.id.radio_red);
        final RadioButton rb2 = (RadioButton) findViewById(R.id.radio_blue);
        rb1.setOnClickListener(radio_listener);
        rb2.setOnClickListener(radio_listener);

}
    OnClickListener radio_listener = new OnClickListener() {
        public void onClick(View v) {
            // Perform action on clicks
             if(v == radio_listener)
            {

            if(rb1.isChecked() == true){Toast.makeText(cafechoice.this, 1, Toast.LENGTH_SHORT).show();}
            if(rb2.isChecked() == true){Toast.makeText(cafechoice.this, 1, Toast.LENGTH_SHORT).show();}
            }
    }
    };

}

@rekaszeru this is my logcatview

05-02 17:16:28.206: WARN/dalvikvm(678): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
05-02 17:16:28.216: ERROR/AndroidRuntime(678): Uncaught handler: thread main exiting due to uncaught exception
05-02 17:16:28.248: ERROR/AndroidRuntime(678): java.lang.RuntimeException: Unable to start activity ComponentInfo{kostas.menu.chania/kostas.menu.chania.cafechoice}: java.lang.NullPointerException
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2481)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2497)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1848)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.os.Looper.loop(Looper.java:123)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.ActivityThread.main(ActivityThread.java:4338)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at java.lang.reflect.Method.invokeNative(Native Method)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at java.lang.reflect.Method.invoke(Method.java:521)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at dalvik.system.NativeStart.main(Native Method)
05-02 17:16:28.248: ERROR/AndroidRuntime(678): Caused by: java.lang.NullPointerException
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at kostas.menu.chania.cafechoice.onCreate(cafechoice.java:24)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2444)
05-02 17:16:28.248: ERROR/AndroidRuntime(678):     ... 11 more
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1 Answer

  1. Editorial Team

    You should rather use a checkedChangeListener:

    final CompoundButton.OnCheckedChangeListener radio_listener = 
    new CompoundButton.OnCheckedChangeListener()
{
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
    {
        if (!isChecked)
            return;
        if (buttonView.getId() == R.id.radio_red)
            Toast.makeText(cafechoice.this, 1, Toast.LENGTH_SHORT).show();
        else if (buttonView.getId() == R.id.radio_blue)
            Toast.makeText(cafechoice.this, 1, Toast.LENGTH_SHORT).show();
    }
};

    and in your onCreate method:

    rb1.setOnCheckedChangeListener(radio_listener);
rb2.setOnCheckedChangeListener(radio_listener);
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