Question

I have a problem and I am very confiused. I have a Dialog that it contains a Button.
I show the dialog in main Activity with this code, so simple:

InfoDialog id=new InfoDialog(this);
id.show();

and I want when I click on Button, it starts the second activity. you see it is so easy, I use this code:

public class InfoDialog extends Dialog implements android.view.View.OnClickListener{

    Context context;

    public InfoDialog(Context context) {
        super(context);
        setContentView(R.layout.infodialog);
        this.context=context;
        setupViews();
    }

    private void setupViews() {
        Button button=(Button)findViewById(R.id.button1);
        button.setOnClickListener(this);    
    } 

    @Override
    public void onClick(View v) {

        switch (v.getId()){
        case R.id.button1:
            Intent newintent= new Intent(context,DestActivity.class);
            context.startActivity(newintent);
            break;  
    }
}

and I declare the destAct in Manifest too. when I run it on Gingerbread Android an older sdk versions it works fine. but when I run this code on ice cream sandwich (sdk 11) or higher it gives me force close!!!

this is my log cat:

08-27 09:38:54.540: W/dalvikvm(10945): threadid=1: thread exiting with uncaught exception (group=0x40a3d1f8)
08-27 09:38:54.544: E/AndroidRuntime(10945): FATAL EXCEPTION: main
08-27 09:38:54.544: E/AndroidRuntime(10945): java.lang.NullPointerException
08-27 09:38:54.544: E/AndroidRuntime(10945):    at my.app.InfoDialog.onClick(InfoDialog.java:131)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at android.view.View.performClick(View.java:3511)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at android.view.View$PerformClick.run(View.java:14105)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at android.os.Handler.handleCallback(Handler.java:605)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at android.os.Handler.dispatchMessage(Handler.java:92)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at android.os.Looper.loop(Looper.java:137)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at android.app.ActivityThread.main(ActivityThread.java:4575)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at java.lang.reflect.Method.invokeNative(Native Method)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at java.lang.reflect.Method.invoke(Method.java:511)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
08-27 09:38:54.544: E/AndroidRuntime(10945):    at dalvik.system.NativeStart.main(Native Method)

what the hell is this? please help me guys

Answer 1

finally i fix it. i used a handler and write startActivity codes on handler message receive. and in button’s onClick method just i sent a message to my handler. and it works fine on sdk>11. but i still dont now why my old code didnt work 😉