Fragment和Acitiity布局交互使用

实例一：通过监听Fragement布局中的Button实现Toast通知             调用 onAttach 创建fragmentActivity public class BlankFragment extends Fragment  { private  CallBback callBback;     private Button button1;     @Override       public void onAttach(Context context) {//绑定Acyivity         if (context !=null)             callBback = (CallBback) context;//传值         super.onAttach(context);}     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {return inflater.inflate(R.layout.fragment_blank,container,false);}     public void onSaveInstanceState(Bundle outState) {         super.onSaveInstanceState(outState);     }     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {         super.onViewCreated(view, savedInstanceState);         button1= (Button) view.findViewById(R.id.fragmentbutton);设置监听         button1.setOnClickListener(new View.OnClickListener() {             public void onClick(View view) {                 callBback.toast();}});}//回调ctivity实现TAOST     public  interface  CallBback{//回调方法         void toast();} } 创建ACTIVITY public class MainActivity extends AppCompatActivity implements BlankFragment.CallBback {//实现fragment回调接口     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main) ;}     @Override     public void toast() {         Toast.makeText(this, "来自fragment回调", Toast.LENGTH_SHORT).show();     } } 创建Activity布局  并且把fragment加载进去

实例二：通过监听Acitvity布局中的Button改变fragment中布局   调用onAttachFragment方法 继承 MainActivity.callback实现里面的抽象方法