Android Activity跳转的小结

核心提示：text = getIntent().getStringExtra("request_text_for_main");request_text.setText(text);}btn = (Button)this.findViewById(R.id.btn);btn.setOnClickListene

text = getIntent().getStringExtra("request_text_for_main");

request_text.setText(text);

}

btn = (Button)this.findViewById(R.id.btn);

btn.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

Intent i = new Intent(SecondActivity.this,ThirdActivity.class);

i.putExtra("request_text_for_second", text+" "+"从SecondActivity传递到ThirdActivity");

startActivityForResult(i, SECOND_REQUEST_CODE);

}

});

finalBtn = (Button)this.findViewById(R.id.finalBtn);

finalBtn.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

Intent i = new Intent();

i.putExtra("final_request", text+" "+"从SecondActivity最后传递到Main");

setResult(Activity.RESULT_FIRST_USER,i);

finish();

}

});

}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if(requestCode==SECOND_REQUEST_CODE && resultCode==Activity.RESULT_OK){

if(data != null) {

text = data.getStringExtra("request_text_for_third");

request_text.setText(text);

}

}

}

}

public class SecondActivity extends Activity{

private TextView request_text;

private Button btn,finalBtn;

private final int SECOND_REQUEST_CODE = 2;

private String text;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.second);

request_text = (TextView)this.findViewById(R.id.request_text);

if (getIntent().getStringExtra("request_text_for_main") != null) {

text = getIntent().getStringExtra("request_text_for_main");