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public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2);
button1=(Button) this.findViewById(R.id.button1);
button1.setOnClickListener(BtnOnClickListener);
}
public OnClickListener BtnOnClickListener=new OnClickListener(){
public void OnClick(View arg0){
Toast toast=Toast.makeText(getApplicationContext(), "test",Toast.LENGTH_LONG);
toast.show();
Intent it=new Intent(Activity2.this,MainActivity.class);
Activity2.this.startActivity(it);
finish();
}