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protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.secondlayout);
Button button2 = (Button) findViewById(R.id.button2);
Intent intent = getIntent(); // 1
String data = intent.getStringExtra("extra_data");
Log.d("dosecond", data);
button2.setOnClickListener(new OnClickListener(){
public void onClick(View v){
intent.putExtra("data_return", "hello firstActivity"); // 2
setResult(RESULT_OK,intent); // 3
finish();
}
});