fragment A里面点击button跳转到fragment B的实现

方法一：直接getActivity，使用activity的fragmenttransation的replace方法替换

假设

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class OneFragment extends Fragment{     private Button btn;     @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,             Bundle savedInstanceState) {         View view = inflater.inflate(R.layout.frag_one, null);         btn = (Button)view.findViewById(R.id.button);         btn.setOnClickListener(new OnClickListener() {                           @Override             public void onClick(View v) {                 FragmentManager fm = getActivity().getFragmentManager();                 fm.beginTransaction()                 //替换为TwoFragment                 .replace(R.id.fragment_container,new TwoFragment())                 .addToBackStack(null) //将当前fragment加入到返回栈，如果在跳转后返回，在返回点击事件中 //利用getFragmentManager().popBackStack();返回                 .commit();             }         });         return super.onCreateView(inflater, container, savedInstanceState);     } }

但是这样做会使OneFragment和原activity的耦合度提高,fragment设计出来就是有重用的目的，所以不好，使用方法二

方法2：定义回调函数，当button按下调用回调

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class OneFragment extends Fragment{     private Button btn;     private OnButtonClick onButtonClick;     @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,             Bundle savedInstanceState) {         View view = inflater.inflate(R.layout.frag_one, null);         btn = (Button)view.findViewById(R.id.button);         btn.setOnClickListener(new OnClickListener() {                           @Override             public void onClick(View v) {                 if(onButtonClick!=null){                     onButtonClick.onClick(btn);                 }             }         });         return super.onCreateView(inflater, container, savedInstanceState);     }     public OnButtonClick getOnButtonClick() {         return onButtonClick;     }     public void setOnButtonClick(OnButtonClick onButtonClick) {         this.onButtonClick = onButtonClick;     }     public interface OnButtonClick{         public void onClick(View view);     } }

这样只要在acitivty中设置回调即可

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public class MainActivity extends Activity {       private OneFragment oneFragment = new OneFragment();     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         //。。。         //。。。省略代码         oneFragment.setOnButtonClick(new OnButtonClick() {                           @Override             public void onClick(View view) {                 //切换到TwoFragment                 fm.beginTransaction()                 //替换为TwoFragment                 .replace(R.layout.fragment_container,new TwoFragment())                 .commit();             }         });     } }