启动第二个Acitivity和intent传递数据

package com.example.work;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;

public class MainActivity extends Activity
{
    private Button btn;
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new OnClickListener()
        {

            public void onClick(View arg0)
            {
                Intent intent = new Intent("com.example.work.OOO");
                intent.putExtra("ooo", "传递过去的");
                startActivity(intent);
            }
        });
    }

    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    public boolean onOptionsItemSelected(MenuItem item)
    {
        int id = item.getItemId();
        if (id == R.id.action_settings)
        {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

package com.example.work;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.widget.TextView;

public class TwoActivity extends Activity
{
    private TextView tView;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.twoactivity);
        tView = (TextView) findViewById(R.id.tv);
        tView.setText(getIntent().getStringExtra("ooo"));
    }
    
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.work"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="20" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".TwoActivity" >
            <intent-filter>
                <action android:name="com.example.work.OOO" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>