Android Activity返回结果startActivityForResult函数

点击第一个按钮，然后再第二个页面中输入文字，就会在第一个的EditText中出现在第二个Activity中输入的文字，、

代码一看就能明白startActivityForResult函数

第一个Activity

import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class DataBackActivity extends Activity { /** Called when the activity is first created. */ private static final int REQUESTCODE=1; private Button button; private EditText editText; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button=(Button) findViewById(R.id.button1); editText=(EditText) findViewById(R.id.editText1); button.setOnClickListener(new MyButtonLIstener()); } class MyButtonLIstener implements OnClickListener{ @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent=new Intent(); intent.setClass(DataBackActivity.this, To.class); startActivityForResult(intent, REQUESTCODE); } } /* (non-Javadoc) * @see android.app.Activity#onActivityResult(int, int, android.content.Intent) */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub if (requestCode==REQUESTCODE) { switch (resultCode) { case RESULT_OK: String dateString=data.getExtras().getString("Da"); Log.i("----------->", dateString); editText.setText(dateString); break; default: break; } } super.onActivityResult(requestCode, resultCode, data); } }

第二个Activity

package rw.data; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class To extends Activity { /** Called when the activity is first created. */ private Button button; private EditText editText; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.to); button=(Button) findViewById(R.id.button1); editText=(EditText) findViewById(R.id.editText1); button.setOnClickListener(new MyButtonLIstener()); } class MyButtonLIstener implements OnClickListener{ @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent=new Intent(); intent.putExtra("Da", editText.getText().toString()); To.this.setResult(RESULT_OK, intent); To.this.finish(); } } }