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>