Android使用Fragment来实现TabHost的功能（解决切换Fragment状态不保存）以及各个Fragment之间的通信

@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
System.out.println("BBBBBBBBBBB____onActivityCreated");
this.getView().findViewById(R.id.clickme).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// 获得绑定的FragmentActivity
MainActivity activity = ((MainActivity)getActivity());
// 获得TabAFm的控件
EditText editText = (EditText) activity.fragments.get(0).getView().findViewById(R.id.edit);

Toast.makeText(activity, activity.hello + editText.getText(), Toast.LENGTH_SHORT).show();
}
});
}

// 获得绑定的FragmentActivity
MainActivity activity = ((MainActivity)getActivity());