Activity与Fragment通信方式

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Fragment和Activity通信

1.接口方法

最好的方法无非就是通过接口.这样就可以避免不修改的问题.

2.例子:

A.接口的定义

public interface OnViewPagerSelected{    void onSelected(int position);}

B.Activity的实现接口

public class FuliQiLinActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener, OnViewPagerSelected{    OnViewPagerSelected mOnViewPagerSelected;    @Override    public void onAttachFragment(android.support.v4.app.Fragment fragment)    {        mOnViewPagerSelected = (OnViewPagerSelected)fragment;        super.onAttachFragment(fragment);    }    /**     * 自定义接口,Fragment-> Activity     *     * @param position     */    @Override    public void onSelected(int position)    {    }}

C.Fragment 的实现

public class QiLinFragment extends Fragment implements OnViewPagerSelected{    OnViewPagerSelected mOnViewPagerSelected;    @Override    public void onAttach(Activity activity)    {        mOnViewPagerSelected = (OnViewPagerSelected)activity;        super.onAttach(activity);    }    /**      *Activity -> Fragment      */    @Override    public void onSelected(int position)    {        Log.e("taggg", "" + position);    }}

注意:导入的包名正解性,是app.Fragment还是support.v4.support.Fragment

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