详解Android activity与fragment之间的通信交互

public class MainActivity extends Activity{  public boolean mBaiDuSDK_is_Ok = false;  public boolean ismBaiDuSDK_is_Ok() {    return mBaiDuSDK_is_Ok;  }  public void setmBaiDuSDK_is_Ok(boolean mBaiDuSDK_is_Ok) {    this.mBaiDuSDK_is_Ok = mBaiDuSDK_is_Ok;  }   }

public class Test1Fragment extends Fragment implements OnClickListener {  private Activity mActivity;  @Override  public View onCreateView(LayoutInflater inflater, ViewGroup container,               Bundle savedInstanceState) {    mActivity = getActivity();//在界面创建时，定义父Activity    view = inflater.inflate(R.layout.fragment_test1, container, false);    return view;  }  @Override  public void onViewCreated(View view, Bundle savedInstanceState) {   // fragment_test1 布局中的一个测试按钮   Button test_button= (Button) view.findViewById(R.id. test_button);   test_button setOnClickListener(this);//设置按钮监听事件   super.onViewCreated(view, savedInstanceState);  }  @Override  public void onClick(View view) {    // TODO Auto-generated method stub    switch (view.getId()) {      //测试按钮监听事件      case R.id.test_button:        // mActivity即为代表的父Activity        Intent intent = new Intent(mActivity, SecondActivity.class);        Log.i("BAIDUSDK", "验证：" + ((MainActivity) mActivity).ismBaiDuSDK_is_Ok());        //最为关键的一步，fragment调用父activity的成员方法，进行通信        if (((MainActivity) mActivity).ismBaiDuSDK_is_Ok()) {          startActivity(intent);        } else {          Log.e("TEST","请确认mBaiDuSDK_is_Ok是否正常！");        }      break;    }  }}