Fragment间传值三种方式

参考：Fragment间传值三种方式

方式一：set方法

1、在【接收方】的fragment中设置setData方法

public void setData(String string) { bt_main.setText(string); }

2、在【发送方】获取【接收方】的fragment，并调用setData方法

// 方法一：在MainFragment中设置一个setData()方法，在方法中设置更改按钮名称 MainFragment mainFragment = (MainFragment)getActivity().getSupportFragmentManager().findFragmentByTag("mainFragment"); mainFragment.setData(mDatas.get(position));

方式二：接口回调

1、【发送方】的fragment中设置接口

private OnDataTransmissionListener mListener; //接口回调的方法 public interface OnDataTransmissionListener { void dataTransmission(String data); } public void setOnDataTransmissionListener(OnDataTransmissionListener mListener) { this.mListener = mListener; }

2、【发送方】的fragment中接口设置数据

//方法二：采取接口回调的方式进行数据传递 if (mListener != null) { mListener.dataTransmission(mDatas.get(position)); }

3、在activity中实现接口，并将数据传给【接收方】的fragment

MenuFragment menuFragment = new MenuFragment(); final MainFragment mainFragment = new MainFragment(); menuFragment.setOnDataTransmissionListener(new MenuFragment.OnDataTransmissionListener() { @Override public void dataTransmission(String data) { mainFragment.setData(data); } });

方式三：eventbus

1、添加eventbus依赖：

compile 'org.greenrobot:eventbus:3.0.0'

2、【发送方】的fragment传递数据

//方法三：使用第三方开源框架EventBus EventBus.getDefault().post(mDatas.get(position));//传递数据

3、【接收方】的fragment接收数据

@Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View mainView = View.inflate(getActivity(), R.layout.main_fragemnt, null); bt_main = (Button) mainView.findViewById(R.id.bt_main); EventBus.getDefault().register(this);//注册 return mainView; } @Subscribe public void onEvent(String data) {//接受数据 bt_main.setText(data); } @Override public void onDestroy() { super.onDestroy(); EventBus.getDefault().unregister(this);//取消注册 }

示例：

MainActivityIII

public class MainActivityIII extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_mainiii); //实例化两个Fragment MenuFragment menuFragment = new MenuFragment(); final MainFragment mainFragment = new MainFragment(); //将上面的两个Fragment添加进来 getSupportFragmentManager().beginTransaction().replace(R.id.fl_menu, menuFragment, "menuFragment").commit(); getSupportFragmentManager().beginTransaction().replace(R.id.fl_main, mainFragment, "mainFragment").commit(); menuFragment.setOnDataTransmissionListener(new MenuFragment.OnDataTransmissionListener() { @Override public void dataTransmission(String data) { mainFragment.setData(data); } }); } }

MainActivityIII 布局：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <FrameLayout android:id="@+id/fl_menu" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:background="#20ff0000" /> <FrameLayout android:id="@+id/fl_main" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="2" android:background="#2500ff00" /> </LinearLayout>

MenuFragment

public class MenuFragment extends Fragment { private String[] ways = {"通过标签获取", "采取接口回调", "开源框架：EventBus"}; private List<String> mDatas = new ArrayList<>(); private OnDataTransmissionListener mListener; @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View menuView = View.inflate(getActivity(), R.layout.menu_fragemnt, null); for (int i = 0; i < ways.length; i++) { mDatas.add(ways[i]); } final ListView lv = (ListView) menuView.findViewById(R.id.lv_menu); lv.setAdapter(new BaseAdapter() { @Override public int getCount() { return mDatas.size(); } @Override public Object getItem(int position) { return mDatas.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View contentView = LayoutInflater.from(getActivity()).inflate(R.layout.menu_fragemnt_item, parent, false); TextView tv = (TextView) contentView.findViewById(R.id.tv_menu_item); tv.setText(mDatas.get(position)); /** * 需求：点击对应的条目，将条目的内容发送到MainFragment中的Button上，更改Button名称（即进行一个数据传递） */ lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { switch (position) { case 0: /** * 方法一：在MainFragment中设置一个setData()方法，在方法中设置更改按钮名称 */ MainFragment mainFragment = (MainFragment) getActivity() .getSupportFragmentManager().findFragmentByTag("mainFragment"); mainFragment.setData(mDatas.get(position)); break; case 1: /** * 方法二：采取接口回调的方式进行数据传递 */ if (mListener != null) mListener.dataTransmission(mDatas.get(position)); break; case 2: /** * 方法三：使用第三方开源框架EventBus */ EventBus.getDefault().post(mDatas.get(position)); break; default: break; } } }); return contentView; } }); return menuView; } //接口回调的方法 public interface OnDataTransmissionListener { void dataTransmission(String data); } public void setOnDataTransmissionListener(OnDataTransmissionListener mListener) { this.mListener = mListener; } }

MenuFragment布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <ListView android:id="@+id/lv_menu" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>

listview的item布局：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <TextView android:id="@+id/tv_menu_item" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:text="item" android:textColor="@color/colorAccent" android:textSize="25sp" /> </LinearLayout>

MainFragment

public class MainFragment extends Fragment { private Button bt_main; @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View mainView = View.inflate(getActivity(), R.layout.main_fragemnt, null); bt_main = (Button) mainView.findViewById(R.id.bt_main); EventBus.getDefault().register(this); return mainView; } @Subscribe public void onEvent(String data) { bt_main.setText(data); } public void setData(String string) { bt_main.setText(string); } @Override public void onDestroy() { super.onDestroy(); EventBus.getDefault().unregister(this); } }

MainFragment布局

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/bt_main" android:layout_width="200dp" android:layout_height="200dp" android:layout_centerInParent="true" android:background="#ff0" android:text="根据条目改变内容" /> </RelativeLayout>