跳转回传

package com.qy.android_huichuan;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    // 1找控件，设置监听
    findViewById(R.id.button).setOnClickListener(new OnClickListener() {

        @Override

        public void onClick(View v) {
            Intent intent = new Intent(MainActivity.this, TwoActivity.class);
            // 传值
            intent.putExtra("key", "跳转");
            // 参数（1.intent，2请求码）
            startActivityForResult(intent, 1);

        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);
    // 判断返回码是否正确
    if (resultCode == 1) {
        String key2 = data.getStringExtra("key2");
        Toast.makeText(MainActivity.this, key2, 0).show();
    }

}

}

package com.qy.android_huichuan;

import org.w3c.dom.Text;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.TextView;

public class TwoActivity extends Activity {

private EditText text;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_two);
    //获取跳转来的意图
    Intent intent =getIntent();
    text = (EditText) findViewById(R.id.text);
    String key=intent.getStringExtra("key");
    text.setText(key);
    //回传
     findViewById(R.id.button2).setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            String key2=text.getText().toString();
            Intent intent2=new Intent();
            intent2.putExtra("key2", key2);
            setResult(1, intent2);
            //回传后必须要 干掉第二个activity，如果不写就会跳不过去
            finish();

        }
    });
}