Fragment间传值三种方式

最新推荐文章于 2025-06-04 14:41:00 发布

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本文介绍了在Android开发中，不同Fragment之间传递数据的三种常见方式：通过set方法直接传递、利用接口回调机制以及借助EventBus开源框架。每种方式都提供了详细的实现步骤与示例代码。

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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>