Android之隐式启动通过action跳转到指定的Activity

package com.example.test21;

import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends ActionBarActivity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
	public void btnOnclick(View view){
		Intent intent=new Intent();
		intent.setClass(this, SecondActivity.class);
		startActivity(intent);
	}
	
	public void btn2Onclick(View view){
		Intent intent=new Intent();
		intent.setAction("mayangyang.action.Three");
		startActivity(intent);
	}
}