Apps Android Button and ImageButton method issues

[MadCode]

Hello.
There is any particular way to use Button or imageButton with every Android version ? The code I used to create a Button(I also used an ImageButton) give me crash problem with the emulator of Nexus 5 and Samsung S4 while in Samsung Galaxy Ace it works! The code I used :

MyBut.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.i("Clicked", " ! ");
        }
    });

I also used the xml way but with androidnClick="" seems that Android Studio can't find the method DoThis(View v) and so it crashes. Any suggestion?

logcat :

02-21 20:01:17.085    2323-2323/testing.test E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: testing.test, PID: 2323
    java.lang.RuntimeException: Unable to start activity ComponentInfo{testing.test/testing.test.MainActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at testing.test.MainActivity.onCreate(MainActivity.java:27)
            at android.app.Activity.performCreate(Activity.java:5231)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
            at android.app.ActivityThread.access$800(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

 

[GameTheory]

@MadCode

This is the easy way to do it in Android Studio which works...

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="MadCode"
            android:text="@string/mad_code"
            android:id="@+id/button1" />

Setup your string if any.

public void MadCode(View view) {
    // Your button action here
}