过滤的可Spannable文本在我的情况下不起作用

Question

你好，我有这个链接 如何使用 SearchView 小部件在回收器视图中创建自定义过滤列表时突出显示回收器视图中的过滤文本。但它对我的情况不起作用，我的代码有什么问题？如果你能看和协助，我真的很感激..

感谢SaravInfern关注我的情况，过滤成功但没有改变颜色

这是我的适配器：

public class TanamanAdapter extends RecyclerView.Adapter<DaftarTanamanVH>{
private List<Tanaman> mTanaman;
private ImageLoader imageLoader;
private Context context;
String searchText = "";
public TanamanAdapter(List<Tanaman> mTanaman, Context context){
    this.mTanaman = mTanaman;
    this.context = context;
}
@Override
public DaftarTanamanVH onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_tanaman,parent,false);
    return new DaftarTanamanVH(v);
}
@Override
public void onBindViewHolder(DaftarTanamanVH holder, int position) {
    final Tanaman tanaman = mTanaman.get(position);
    String namaTanaman = tanaman.getNama_tanaman();
    String namaIlmiah = tanaman.getNama_ilmiah();
    String urlGambar = tanaman.getUrlGambar();

    imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
    imageLoader.get(urlGambar,ImageLoader.getImageListener(holder.networkImageView,R.mipmap.ic_launcher,android.R.drawable.ic_dialog_alert));
    //holder.bind(tanaman);
    holder.tv_nama_tanaman.setText(namaTanaman);
    holder.networkImageView.setImageUrl(urlGambar,imageLoader);
    if(searchText.length() > 0){
        int index = namaIlmiah.indexOf(searchText);
        while(index > 0){
            SpannableStringBuilder sb = new SpannableStringBuilder(namaIlmiah);
            ForegroundColorSpan fcs = new ForegroundColorSpan(Color.BLUE);
            sb.setSpan(fcs,index,searchText.length(),Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
            index = namaIlmiah.indexOf(searchText,index+1);
            holder.tv_nama_ilmiah.setText(sb);
        }
    }else{
        holder.tv_nama_ilmiah.setText(namaIlmiah);
    }

    /*
    holder.cardView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent(v.getContext(), DetailTanaman.class);
            intent.putExtra("KEY_ID",tanaman.getId_tanaman());
            intent.putExtra("KEY_NAMA",tanaman.getNama_tanaman());
            intent.putExtra("KEY_ILMIAH",tanaman.getNama_ilmiah());
            intent.putExtra("KEY_GAMBAR",tanaman.getUrlGambar());
            v.getContext().startActivity(intent);
        }
    });*/
}
@Override
public int getItemCount() {
    return mTanaman.size();
}
public void setFilter(List<Tanaman> tanamanList, String searchText){
    mTanaman = new ArrayList<>();
    mTanaman.addAll(tanamanList);
    this.searchText = searchText;
    notifyDataSetChanged();
}
}

这是我的活动：

public class DaftarTanaman extends AppCompatActivity implements SearchView.OnQueryTextListener{
private RecyclerView recyclerView;
private List<Tanaman> mTanaman;
private TanamanAdapter tanamanAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_daftar_tanaman);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);

    recyclerView = (RecyclerView) findViewById(R.id.rv_daftar_tanaman);
    LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    recyclerView.setLayoutManager(layoutManager);
    mTanaman = new ArrayList<>();
    getDataTanaman();
}

private void getDataTanaman() {
    final ProgressDialog loading = ProgressDialog.show(this,"Mohon tunggu ...","Sedang mengambil data...",false,false);
    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(ConfigTanaman.DATA_URL_TANAMAN, new Response.Listener<JSONArray>() {
        @Override
        public void onResponse(JSONArray jsonArray) {
            loading.dismiss();
            parseData(jsonArray);
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError volleyError) {
        }
    });
    RequestQueue requestQueue = Volley.newRequestQueue(this);
    requestQueue.add(jsonArrayRequest);
}
private void parseData(JSONArray jsonArray) {
    for(int i=0;i<jsonArray.length();i++){
        Tanaman tanaman = new Tanaman();
        JSONObject jsonObject = null;
        try{
            jsonObject = jsonArray.getJSONObject(i);
            tanaman.setId_tanaman(jsonObject.getString(ConfigTanaman.TAG_ID));
            tanaman.setNama_tanaman(jsonObject.getString(ConfigTanaman.TAG_NAMA));
            tanaman.setNama_ilmiah(jsonObject.getString(ConfigTanaman.TAG_ILMIAH));
            tanaman.setUrlGambar(jsonObject.getString(ConfigTanaman.TAG_URL_GAMBAR));
        }catch(JSONException e){
            e.printStackTrace();
        }
        mTanaman.add(tanaman);
    }
    tanamanAdapter = new TanamanAdapter(mTanaman,this);
    recyclerView.setAdapter(tanamanAdapter);
}
@Override
public boolean onQueryTextSubmit(String query) {
    final List<Tanaman> filteredTanaman = filter(mTanaman,query);
    tanamanAdapter.setFilter(filteredTanaman,query);
    if(filteredTanaman.size() == 0){
        Toast.makeText(DaftarTanaman.this, "Maaf, data dengan kata kunci "+query+" tidak ditemukan", Toast.LENGTH_SHORT).show();
        return false;
    }
    return true;
}
private List<Tanaman> filter(List<Tanaman> models, String query) {
    query = query.toLowerCase();
    final List<Tanaman> filteredTanaman = new ArrayList<>();
    KMP kmp = new KMP();
    for(Tanaman model: models){
        final String source = model.getNama_tanaman().toLowerCase();
        int pos = kmp.postMatch(source,query);
        if(pos != -1){
            filteredTanaman.add(model);
        }
    }
    return filteredTanaman;
}

@Override
public boolean onQueryTextChange(String newText) {
    return false;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_main,menu);
    final MenuItem item = menu.findItem(R.id.action_search);
    final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
    searchView.setOnQueryTextListener(this);
    MenuItemCompat.setOnActionExpandListener(item, new MenuItemCompat.OnActionExpandListener() {
        @Override
        public boolean onMenuItemActionExpand(MenuItem item) {
            return true;
        }
        @Override
        public boolean onMenuItemActionCollapse(MenuItem item) {
            tanamanAdapter.setFilter(mTanaman,"");
            return true;
        }
    });
    return super.onCreateOptionsMenu(menu);
}
}

这是显示错误的日志猫：

FATAL EXCEPTION: main
                                                                             Process: id.tanamanobat.skripsi.qori.ensiklopeditanamanobat, PID: 2927
                                                                                              java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
                                                                                                  at id.tanamanobat.skripsi.qori.ensiklopeditanamanobat.Adapter.TanamanAdapter.onBindViewHolder(TanamanAdapter.java:67)
                                                                                                  at id.tanamanobat.skripsi.qori.ensiklopeditanamanobat.Adapter.TanamanAdapter.onBindViewHolder(TanamanAdapter.java:35)
                                                                                                  at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5471)
                                                                                                  at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5504)
                                                                                                  at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4741)
                                                                                                  at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
                                                                                                  at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994)
                                                                                                  at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390)
                                                                                                  at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353)
                                                                                                  at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
                                                                                                  at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028)
                                                                                                  at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906)
                                                                                                  at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
                                                                                                  at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
                                                                                                  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
                                                                                                  at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
                                                                                                  at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
                                                                                                  at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
                                                                                                  at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)
                                                                                                  at android.widget.FrameLayout.onLayout(FrameLayout.java:508)
                                                                                                  at android.view.View.layout(View.java:15596)
                                                                                                  at android.view.ViewGroup.layout(ViewGroup.java:4966)
                                                                                                  at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2072)
                                                                                                  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1829)
                                                                                                  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
                                                                                                  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
                                                                                                  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
                                                                                                  at android.view.Choreographer.doCallbacks(Choreographer.java:580)
                                                                                                  at android.view.Choreographer.doFrame(Choreographer.java:550)
                                                                                                  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
                                                                                                  at android.os.Handler.handleCallback(Handler.java:739)
                                                                                                  at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                                  at android.os.Looper.loop(Looper.java:135)
                                                                                                  at android.app.ActivityThread.main(ActivityThread.java:5221)
                                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                                  at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
                                                                                                at com.android.internal.os.ZygoteInit.main(ZygoteInit.jav

这是屏幕截图：

过滤后的文本未更改

Answer 1

来自您的logcat错误Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference我可以说，当您创建适配器时，您的searchText为空，您在调用setFilter时在其中存储值，因此最简单的解决方案是将空白值分配给您的searchText

String searchText = "";

Answer 2

您必须像这样初始化搜索文本String searchText = "";或执行空检查

if(searchText.length() > 0 && searchText!=null){
        int index = namaIlmiah.indexOf(searchText);
        while(index > 0){
            SpannableStringBuilder sb = new SpannableStringBuilder(namaIlmiah);
            ForegroundColorSpan fcs = new ForegroundColorSpan(Color.BLUE);
            sb.setSpan(fcs,index,searchText.length(),Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
            index = namaIlmiah.indexOf(searchText,index+1);
            holder.tv_nama_ilmiah.setText(sb);
        }
    }else{
        holder.tv_nama_ilmiah.setText(namaIlmiah);
    }