fragment----接口回调

最新推荐文章于 2024-05-27 23:56:30 发布

原创最新推荐文章于 2024-05-27 23:56:30 发布 · 489 阅读

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CC 4.0 BY-SA版权

这篇博客介绍了在Android中如何使用接口实现Fragment之间的通信，通过一个实例展示了Fragment1监听ListView点击事件，并通过接口将点击信息传递给Fragment2，使Fragment2更新TextView内容。

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1: 布局 layout_main

2: 布局 fragment1

3：布局 fragment2

<TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

4：代码 fragment1

public class Fragment1 extends Fragment {

    private ListView lv;
    private List<String> list = new ArrayList<>();

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment1, null);
        getData();
        //找控件
        initView(view);
        return view;
    }

    private void getData() {
        for (int i = 0; i < 10; i++) {
            list.add("条目：" + i);
        }
    }

    private void initView(View view) {
        lv = (ListView) view.findViewById(R.id.lv);
        ArrayAdapter adapter = new ArrayAdapter(getActivity(), android.R.layout.simple_list_item_1, list);
        lv.setAdapter(adapter);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (listener != null) {
                    listener.onFragmentClick(list.get(position));
                }
            }
        });
    }

    //声明一个接口
    private OnFragmentClickListener listener;

    //定义接口方法
    public interface OnFragmentClickListener {
        void onFragmentClick(String item);

    }

    //对外提供一个访问的方法
    public void setOnFragmentClickListener(OnFragmentClickListener listener) {
        this.listener = listener;
    }
}

5：代码 fragment2

public class Fragment2 extends Fragment {

    private TextView tv;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment2, null);
        //找控件
        initView(view);
        return view;
    }

    private void initView(View view) {
        tv = (TextView) view.findViewById(R.id.tv);
        //fragment管理器
        FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
        //得到Fragment1
        Fragment1 fragment1 = (Fragment1) fragmentManager.findFragmentById(R.id.fragment1);
        //实现点击事件
        fragment1.setOnFragmentClickListener(new Fragment1.OnFragmentClickListener() {
            @Override
            public void onFragmentClick(String item) {
                tv.setText("接口回调：" + item);
            }
        });
    }
}