使用ACTION跳转发生异常





setContentView(R.layout.main);
showButton1 = (Button)findViewById(R.id.showbutton1);
showButton2 = (Button)findViewById(R.id.showbutton2);
showButton3 = (Button)findViewById(R.id.showbutton3);
showButton1.setOnClickListener(new showbuttonlistener());
showButton2.setOnClickListener(new buttonlisntenr());
showButton3.setOnClickListener(new buttonlisntener2());

}

class showbuttonlistener implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
intent.setClass(MainActivity.this, activity02.class);
MainActivity.this.startActivity(intent);


}
}

class buttonlisntenr implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent("myaction1");
startActivity(intent);

}


}
class buttonlisntener2 implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent("myaction2");
startActivity(intent);

}


}


求大神打救 action 异常
[解决办法]
可能是button03为null，有没有setcontentView，或者setContent里面的layout有没有id为backbutton的