Android中在fragment A里面点击button跳转到fragment B实现方法

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();  }  });  }  }

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