如何从静态方法访问 getSupportFragmentManager？答案

【问题标题】：how to accsses to getSupportFragmentManager from static method?如何从静态方法访问 getSupportFragmentManager？
【发布时间】：2017-11-11 11:50:15
【问题描述】：

我正在使用 RecyclerView 来显示数据。在回收站视图中，我有 onClick 方法，我想在片段之间替换。我唯一的问题是我无法从静态方法访问 getSupportFragmentManager 或 getChildFragmentManager。 RecyclerView 位于片段内部，而不是活动。

这是 RecyclerView 代码

 public static class TypeMusicListAdapter extends RecyclerView.Adapter<TypeMusicListViewHolder>{
    private LayoutInflater inflater;
    private Context context;
    private List<String> data;

    public TypeMusicListAdapter(Context context, List<String> data){
        this.context = context;
        this.inflater = LayoutInflater.from(context);
        this.data = data;
    }

    @Override
    public TypeMusicListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = inflater.inflate(R.layout.type_music_item,parent,false);
        return new TypeMusicListViewHolder(v);
    }

    @Override
    public void onBindViewHolder(TypeMusicListViewHolder holder, int position) {
        String songType = data.get(position);
        //holder.musicType.setText(songType.getSongName());
        holder.musicType.setText(songType);
    }

    @Override
    public int getItemCount() {
        return data.size();
    }
}

public static class TypeMusicListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private TextView musicType;
    private FragmentManager fm;


    public TypeMusicListViewHolder(View itemView,FragmentManager fm) {
        super(itemView);
        musicType = (TextView) itemView.findViewById(R.id.musicType);
        this.fm = fm;
        musicType.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        getSupportFragmentManager().
                beginTransaction().
                replace(R.id.container, new GenresFragment()).
                commit();
    }
}

当然在 getSupportFragmentManager 中给我错误... 我该怎么办..？

【问题讨论】：

标签： android android-recyclerview fragment

【解决方案1】：

更改您的视图持有者类，使其具有您的活动的成员变量。

public static class TypeMusicListViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    private TextView musicType;
    private FragmentManager fm;
AppCompatActivity activity;

    public TypeMusicListViewHolder(View itemView,FragmentManager fm,AppCompatActivity act) {
        super(itemView);
        musicType = (TextView) itemView.findViewById(R.id.musicType);
        this.fm = fm;
activity = act;
        musicType.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {

        activity.getSupportFragmentManager().
                beginTransaction().
                replace(R.id.container, new GenresFragment()).
                commit();
    }
}

【讨论】：

当我将 AppCompatActivity 从 Recycler 带到外面时，我应该如何初始化它。顺便说一句，它在 Fragment 而不是 Activity。

【解决方案2】：

你应该使用回调接口。

回调类

public interface MyCallback{

  void onButtonClick();
}

适配器

 public static class TypeMusicListAdapter extends RecyclerView.Adapter<TypeMusicListViewHolder> implements View.OnClickListener{
private LayoutInflater inflater;
private Context context;
private List<String> data;

public TypeMusicListAdapter(Context context, List<String> data){
    this.context = context;
    this.inflater = LayoutInflater.from(context);
    this.data = data;
}

@Override
public TypeMusicListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = inflater.inflate(R.layout.type_music_item,parent,false);
    return new TypeMusicListViewHolder(v);
}

@Override
public void onBindViewHolder(TypeMusicListViewHolder holder, int position) {
    String songType = data.get(position);
    //holder.musicType.setText(songType.getSongName());
    holder.musicType.setText(songType);

    holder.musicType.setOnClickListener(this);
}

@Override
public void onClick(View view) {

    ((YourActivity) context).onButtonClick();
}

@Override
public int getItemCount() {
    return data.size();
}
}

   public static class TypeMusicListViewHolder extends RecyclerView.ViewHolder {
private TextView musicType;
private FragmentManager fm;


public TypeMusicListViewHolder(View itemView,FragmentManager fm) {
    super(itemView);
    musicType = (TextView) itemView.findViewById(R.id.musicType);
    this.fm = fm;
}


}

您的活动/片段

(...)

void onButtonClick(){
     getSupportFragmentManager().
            beginTransaction().
            replace(R.id.container, new GenresFragment()).
            commit();
}

【讨论】：