why does my app crash when changing activities?

Question

    import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

 public class howActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.howto);


}

@Override
public boolean onCreateOptionsMenu(Menu menu) 
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

it has to be something in this program because it will switch to other activities just not this one

Answer 1

确保Manifest文件中明确定义了您的活动