<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <Button        android:id="@+id/btn1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="向第二个活动传递数据" /></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/tv1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="这是第二个活动" />    <Button        android:id="@+id/btn2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="返回数据" /></LinearLayout>

public class SecondActivity extends Activity implements OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.secondactivity);                Button btn = (Button) findViewById(R.id.btn2);        btn.setOnClickListener(this);                //第一种方式 intent.getStringExtra(String);或者intent.getIntExtra(String,int defaultValue);        Toast.makeText(this, getIntent().getStringExtra("str1"), Toast.LENGTH_LONG).show();        //Toast.makeText(this, getIntent().getIntExtra("age", 0), Toast.LENGTH_LONG).show();                //第二种方式、利用Bundle对象,bundle.getString()或者bundle.getInt();        //Bundle bundle = getIntent().getExtras();        //Toast.makeText(this, bundle.getString("str2"), Toast.LENGTH_LONG).show();        //Toast.makeText(this,bundle.getInt("age2"),Toast.LENGTH_LONG).show();    }    @Override    public void onClick(View v)     {        Intent intent = new Intent();        //返回数据的        //第一种方式 putExtra()        intent.putExtra("age3", 45);                //第二种方式setExtra()        //intent.setData(Uri.parse("我是返回数据"));                setResult(RESULT_OK,intent);                  //一定记得关闭当前activity并返回控制权        finish();    }}

<activity             android:name=".SecondActivity"            android:label="@string/second_activity">            <intent-filter >                <action android:name="com.example.passingdata"/>                <category android:name="android.intent.category.DEFAULT"/>            </intent-filter>        </activity>

public class MainActivity extends Activity implements OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                Button btn = (Button) findViewById(R.id.btn1);        btn.setOnClickListener(this);    }    @Override    public void onClick(View v)     {        //传递数据的话,也要带上请求码        Intent intent = new Intent("com.example.passingdata.SecondActivity");                        //传递数据的方式1： 使用 intent.putExtra();        intent.putExtra("str1", "String1");        intent.putExtra("age", 25);                        //方式2:bundle.putString(); bundle.putInt();最后把bundle绑定到intent上intent.putExtras();        //Bundle bundle = new Bundle();        //bundle.putString("str2", "String2");        //bundle.putInt("age2", 35);        //intent.putExtras(bundle);  //从这里可以看出,bundle作用上也相当于一个集合                        startActivityForResult(intent,1);    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data)     {        if(requestCode==1)        {            if(resultCode==RESULT_OK)            {                //取得数据                //方式1: getIntExtra()                                Toast.makeText(this,                         Integer.toString(data.getIntExtra("age3", 0)),                         Toast.LENGTH_LONG).show();                                //方式2: intent.getData();  它对应了Uri.parse()那种                //Toast.makeText(this, data.getData().toString(), Toast.LENGTH_LONG).show();            }                        }    }}