pomogite pojalusta.

[novichok_uz]

07-10 02:41:44.083: E/AndroidRuntime(814): FATAL EXCEPTION: main
07-10 02:41:44.083: E/AndroidRuntime(814): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.p0211_onclick/com.example.p0211_onclick.MainActivity}: java.lang.ClassCastException: com.example.p0211_onclick.MainActivity cannot be cast to android.view.View$OnClickListener
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.os.Handler.dispatchMessage(Handler.java:99)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.os.Looper.loop(Looper.java:137)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.ActivityThread.main(ActivityThread.java:5103)
07-10 02:41:44.083: E/AndroidRuntime(814): at java.lang.reflect.Method.invokeNative(Native Method)
07-10 02:41:44.083: E/AndroidRuntime(814): at java.lang.reflect.Method.invoke(Method.java:525)
07-10 02:41:44.083: E/AndroidRuntime(814): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
07-10 02:41:44.083: E/AndroidRuntime(814): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-10 02:41:44.083: E/AndroidRuntime(814): at dalvik.system.NativeStart.main(Native Method)
07-10 02:41:44.083: E/AndroidRuntime(814): Caused by: java.lang.ClassCastException: com.example.p0211_onclick.MainActivity cannot be cast to android.view.View$OnClickListener
07-10 02:41:44.083: E/AndroidRuntime(814): at com.example.p0211_onclick.MainActivity.onCreate(MainActivity.java:24)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.Activity.performCreate(Activity.java:5133)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-10 02:41:44.083: E/AndroidRuntime(814): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
07-10 02:41:44.083: E/AndroidRuntime(814): ... 11 more

na 24 ya napisal kod : bt1.setOnClickListener((OnClickListener)this); esli ya tak napiwu bt1.setOnClickListener(this); togda vapwe kodi owibki dayut

[Dark67]

твой this не реализует OnClickListener, вот и получаешь исключение.