相关疑难解决方法(0)

我有一个活动持有一个片段,在这个片段中有一个按钮,当它被点击时,会弹出一个对话框.

在此对话框中,有一个Viewpager,它包含一些要显示的片段.

以下是代码和错误,请花费宝贵的时间向我展示我的错误.非常感谢你的帮助.

MainActivity.class

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

public class MainActivity extends FragmentActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fm.beginTransaction();

    MyFragment fragment = new MyFragment();

    fragmentTransaction.add(R.id.container, fragment);

    fragmentTransaction.commit();

}
}

MyFragment.class

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;

public class MyFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_sandbox, container, …