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• 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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