Fragment之间的跳转

android中在fragment A里面点击button跳转到fragment B怎么实现？

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

假设

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.layout.fragment_container,new TwoFragment())
                .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

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

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();
            }
        });
    }
}