在第一个activity中使用

startActivityForResult(intent, state_tag);

启动第二个activity，在第二个activity中调用 setResult（，）

在第一个activity中重载onActivityResult（）

第一个Activity：

public class MainActivity extends Activity { private TextView tv = null; private int state_tag = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView)findViewById(R.id.textView); Button button = (Button)findViewById(R.id.button); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent i = new Intent(MainActivity.this, SecondActivity.class); Bundle bundle = new Bundle(); bundle.putString("content", tv.getText().toString()); i.putExtra("bundle", bundle); startActivityForResult(i, state_tag); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if(requestCode == state_tag) { if(resultCode == RESULT_OK) { Log.i("MainActivity", data.getBundleExtra("bundle2").getString("newContend")); tv.setText(data.getBundleExtra("bundle2").getString("newContend")); } else { Log.i("MainActivity", "in else:"); return; } } }}

第二个activity：

package com.example.intenttest;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class SecondActivity extends Activity { private EditText editText = null; private Button okButton = null; private Button cancelButton = null; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); editText = (EditText)findViewById(R.id.editText); okButton = (Button)findViewById(R.id.okButton); cancelButton = (Button)findViewById(R.id.cancelButton); Intent i = getIntent(); editText.setText(i.getBundleExtra("bundle").getString("content")); okButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub Intent i = new Intent(SecondActivity.this, MainActivity.class); Bundle bundle = new Bundle(); bundle.putString("newContent", String.valueOf(editText.getText())); i.putExtra("bundle2", bundle); setResult(RESULT_OK, i); finish(); } }); cancelButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub setResult(RESULT_CANCELED); finish(); } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); }}