Android 如何使用图像在custome listview中执行搜索操作

我试图在自定义listview中设置搜索有一个运行时错误不知道为什么我遵循了一个堆栈over flow post 活动代码：

 private ArrayList<Songfileinfo> songarr = new ArrayList<>();
 private static final int EXT_STORAGE_PERMISSION_REQ_CODE = 2;
 private SearchAdapter adapte;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    checkReadStoragePermission();
    Songdata load = new Songdata();
    this.songarr = load.getPlayList(this);

    ListView listView = (ListView) findViewById(R.id.list);


    EditText editText = (EditText)findViewById(R.id.editText);
    editText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            adapte.getFilter().filter(charSequence.toString());
        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    });
    adapte = new SearchAdapter(this, songarr);
    listView.setAdapter(adapte);
}

---

知道我哪里做错了吗

您正在对空对象应用筛选器

adapte.getFilter().filter(charSequence.toString());

应该是

adapte = new SearchAdapter(this, songarr);

不是

---

由于您已经将

SearchAdapter adapte

定义为全局您必须初始化adapte，我想您不需要

BaseAdapter adapter = new SearchAdapter(this, songarr);

---

然后在adpapter的filter方法中，您必须调用notifyDatasetChanged以反映过滤后的值。

通过跟踪youtube视频之一，我可以获得数据

适配器类代码

public class CustomAdapter extends BaseAdapter implements Filterable {
private ArrayList<Songfileinfo> display;
private ArrayList<Songfileinfo> searcharr;
CustomFilter customFilter;
Context context;

public CustomAdapter(Context context, ArrayList<Songfileinfo> songarr) {
    this.context = context;
    this.display = songarr;
    this.searcharr = songarr;
}

@Override
public int getCount() {
    return display.size();
}

@Override
public Object getItem(int pos) {
    return display.get(pos);
}

@Override
public long getItemId(int pos) {
    return display.indexOf(getItem(pos));
}

@Override
public View getView(int pos, View convertView, ViewGroup parent) {
    LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.custom, null);

    }
    TextView textView = (TextView) convertView.findViewById(R.id.textView);
    TextView textView1 = (TextView) convertView.findViewById(R.id.textView2);
    CircleImageView circleImageView = (CircleImageView) convertView.findViewById(R.id.profile_image);
    textView.setText(display.get(pos).getTitle());
    textView1.setText(display.get(pos).getAlbum());
    Glide.with(context).load(Uri.parse(display.get(pos).getAlbum_art()))
            .thumbnail(0.5f)
            .fitCenter()
            .error(R.drawable.music)
            .diskCacheStrategy(DiskCacheStrategy.SOURCE)
            .into(circleImageView);

    return convertView;
}

@Override
public Filter getFilter() {
    if (customFilter==null){
        customFilter = new CustomFilter();
    }
    return customFilter;
}


class CustomFilter extends Filter {

    @Override
    protected FilterResults performFiltering(CharSequence charSequence) {
        FilterResults filterResults = new FilterResults();
        if (charSequence != null && charSequence.length() > 0) {
            charSequence = charSequence.toString().toUpperCase();
            ArrayList<Songfileinfo> filter = new ArrayList<>();
            for (int i = 0; i < searcharr.size(); i++) {
                if (searcharr.get(i).getTitle().toUpperCase().contains(charSequence)) {
                    Songfileinfo songfileinfo = new Songfileinfo(searcharr.get(i).getTitle(), searcharr.get(i).getAlbum(), searcharr.get(i).getAlbum_art());
                    filter.add(songfileinfo);
                }
            }
            filterResults.count = filter.size();
            filterResults.values = filter;
        } else {
            filterResults.count = searcharr.size();
            filterResults.values = searcharr;
        }

        return filterResults;
    }

    @Override
    protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
        display = (ArrayList<Songfileinfo>) filterResults.values;
        notifyDataSetChanged();
    }
}

公共类CustomAdapter扩展BaseAdapter实现可过滤{
专用阵列列表显示；
私人ArrayList searcharr；
自定义过滤器；
语境；
公共CustomAdapter（上下文上下文，ArrayList songarr）{
this.context=上下文；
this.display=songarr；
this.searcharr=songarr；
}
@凌驾
public int getCount（）{
返回display.size（）；
}
@凌驾
公共对象getItem（int-pos）{
返回显示。获取（pos）；
}
@凌驾
公共长getItemId（int-pos）{
返回显示.indexOf（getItem（pos））；
}
@凌驾
公共视图getView（int pos、视图转换视图、视图组父视图）{
LayoutInflater LayoutInflater=（LayoutInflater）context.getSystemService（context.LAYOUT\u INFLATER\u SERVICE）；
if（convertView==null）{
convertView=LayoutFlater.充气（R.layout.custom，null）；
}
TextView TextView=（TextView）convertView.findViewById（R.id.TextView）；
TextView textView1=（TextView）convertView.findViewById（R.id.textView2）；
CircleImageView CircleImageView=（CircleImageView）convertView.findViewById（R.id.profile_图像）；
textView.setText（display.get（pos.getTitle（））；
textView1.setText（display.get（pos.getAlbum（））；
Glide.with（context）.load（Uri.parse（display.get（pos.getAlbum_art（）））
.缩略图（0.5f）
.fitCenter（）
.错误（R.可绘制音乐）
.diskCacheStrategy（diskCacheStrategy.SOURCE）
.进入（圆形图像视图）；
返回视图；
}
@凌驾
公共过滤器getFilter（）{
if（customFilter==null）{
customFilter=新的customFilter（）；
}
返回自定义过滤器；
}
类CustomFilter扩展了过滤器{
@凌驾
受保护过滤器结果执行过滤（CharSequence CharSequence）{
FilterResults FilterResults=新的FilterResults（）；
if（charSequence！=null&&charSequence.length（）>0）{
charSequence=charSequence.toString（）.toUpperCase（）；
ArrayList过滤器=新的ArrayList（）；
对于（int i=0；i

和我的活动类代码

 private ArrayList<Songfileinfo> songarr = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    checkReadStoragePermission();
    Songdata load = new Songdata();
    this.songarr = load.getPlayList(this);
    ListView listView = (ListView) findViewById(R.id.list);
    SearchView searchView = (SearchView) findViewById(R.id.searchview);
    final CustomAdapter customAdapter = new CustomAdapter(this, songarr);
    listView.setAdapter(customAdapter);
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {



            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            customAdapter.getFilter().filter(newText);
            return false;
        }
    });

}

private ArrayList<Songfileinfo>getPlaylist(){
    ArrayList<Songfileinfo>  newlist =new ArrayList<Songfileinfo>();
    Songfileinfo songfileinfo;
    for (int i =0;i<songarr.size();i++){

        songfileinfo =new Songfileinfo(songarr.get(i).getTitle(),songarr.get(i).getAlbum_art(),songarr.get(i).getAlbum());
        newlist.add(songfileinfo);
    }
    return newlist;
}

private ArrayList songarr=new ArrayList（）；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
checkReadStoragePermission（）；
Songdata加载=新的Songdata（）；
this.songar=load.getPlayList（this）；
ListView ListView=（ListView）findViewById（R.id.list）；
SearchView SearchView=（SearchView）findviewbyd（R.id.SearchView）；
最终CustomAdapter=new CustomAdapter（this，songarr）；
setAdapter（customAdapter）；
searchView.setOnQueryTextListener（新的searchView.OnQueryTextListener（）{
@凌驾
公共布尔值onQueryTextSubmit（字符串查询）{
返回false；
}
@凌驾
公共布尔onQueryTextChange（字符串newText）{
customAdapter.getFilter（）.filter（新文本）；
返回false；
}
});
}
专用ArrayListgetPlaylist（）{
ArrayList newlist=新的ArrayList（）；
Songfileinfo Songfileinfo；
对于（int i=0；我可以发布第一个代码段的完整代码吗？我在filter方法中调用了notify datasetchanged，但它没有过滤我添加的数据adapte.notifyDatasetChanged（），但它仍然不起作用
BaseAdapter adapter = new SearchAdapter(this, songarr);

BaseAdapter adapter = new SearchAdapter(this, songarr);

public class CustomAdapter extends BaseAdapter implements Filterable {
private ArrayList<Songfileinfo> display;
private ArrayList<Songfileinfo> searcharr;
CustomFilter customFilter;
Context context;

public CustomAdapter(Context context, ArrayList<Songfileinfo> songarr) {
    this.context = context;
    this.display = songarr;
    this.searcharr = songarr;
}

@Override
public int getCount() {
    return display.size();
}

@Override
public Object getItem(int pos) {
    return display.get(pos);
}

@Override
public long getItemId(int pos) {
    return display.indexOf(getItem(pos));
}

@Override
public View getView(int pos, View convertView, ViewGroup parent) {
    LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    if (convertView == null) {
        convertView = layoutInflater.inflate(R.layout.custom, null);

    }
    TextView textView = (TextView) convertView.findViewById(R.id.textView);
    TextView textView1 = (TextView) convertView.findViewById(R.id.textView2);
    CircleImageView circleImageView = (CircleImageView) convertView.findViewById(R.id.profile_image);
    textView.setText(display.get(pos).getTitle());
    textView1.setText(display.get(pos).getAlbum());
    Glide.with(context).load(Uri.parse(display.get(pos).getAlbum_art()))
            .thumbnail(0.5f)
            .fitCenter()
            .error(R.drawable.music)
            .diskCacheStrategy(DiskCacheStrategy.SOURCE)
            .into(circleImageView);

    return convertView;
}

@Override
public Filter getFilter() {
    if (customFilter==null){
        customFilter = new CustomFilter();
    }
    return customFilter;
}


class CustomFilter extends Filter {

    @Override
    protected FilterResults performFiltering(CharSequence charSequence) {
        FilterResults filterResults = new FilterResults();
        if (charSequence != null && charSequence.length() > 0) {
            charSequence = charSequence.toString().toUpperCase();
            ArrayList<Songfileinfo> filter = new ArrayList<>();
            for (int i = 0; i < searcharr.size(); i++) {
                if (searcharr.get(i).getTitle().toUpperCase().contains(charSequence)) {
                    Songfileinfo songfileinfo = new Songfileinfo(searcharr.get(i).getTitle(), searcharr.get(i).getAlbum(), searcharr.get(i).getAlbum_art());
                    filter.add(songfileinfo);
                }
            }
            filterResults.count = filter.size();
            filterResults.values = filter;
        } else {
            filterResults.count = searcharr.size();
            filterResults.values = searcharr;
        }

        return filterResults;
    }

    @Override
    protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
        display = (ArrayList<Songfileinfo>) filterResults.values;
        notifyDataSetChanged();
    }
}

 private ArrayList<Songfileinfo> songarr = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    checkReadStoragePermission();
    Songdata load = new Songdata();
    this.songarr = load.getPlayList(this);
    ListView listView = (ListView) findViewById(R.id.list);
    SearchView searchView = (SearchView) findViewById(R.id.searchview);
    final CustomAdapter customAdapter = new CustomAdapter(this, songarr);
    listView.setAdapter(customAdapter);
    searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {



            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            customAdapter.getFilter().filter(newText);
            return false;
        }
    });

}

private ArrayList<Songfileinfo>getPlaylist(){
    ArrayList<Songfileinfo>  newlist =new ArrayList<Songfileinfo>();
    Songfileinfo songfileinfo;
    for (int i =0;i<songarr.size();i++){

        songfileinfo =new Songfileinfo(songarr.get(i).getTitle(),songarr.get(i).getAlbum_art(),songarr.get(i).getAlbum());
        newlist.add(songfileinfo);
    }
    return newlist;
}