android - 如何更改 TextView 数据

Question

我已经创建了一个应用程序，在我的适配器类中我在 textview 中设置了 arraylist ..，但是在搜索时我想添加另一个列表，该列表已经过滤了用户在 textview 中使用 textwatcher 搜索的数据。作为我的适配器有整个联系人列表，我想用在 textwatcher 的帮助下创建的新列表替换它。MainAactivity

  case R.id.action_search:

                    searchText.setVisibility(View.VISIBLE);


                    searchText.addTextChangedListener(new TextWatcher() {

                        public void onTextChanged(CharSequence s, int start, int before, int count) { // TODO Auto-generated method stub
                            s=searchText.getText().toString();
                            ma.getFilter().filter(s);

                        }
                    });


                    break;
                }
                return super.onOptionsItemSelected(item);
            }

我的适配器

@Override
        public View getView(final int position, View convertView,
                ViewGroup parent) {
            // TODO Auto-generated method stub
            View vi = convertView;
            if (convertView == null)
                vi = mInflater.inflate(R.layout.row, null);
            tv = (TextView) vi.findViewById(R.id.textView1);
            tv1 = (TextView) vi.findViewById(R.id.textView2);
            cb = (CheckBox) vi.findViewById(R.id.checkBox1);

            tv.setText(name1.get(position));
            tv1.setText(phno1.get(position));



            cb.setTag(position);

            cb.setChecked(mCheckStates.get(position, false));
            cb.setOnCheckedChangeListener(this);
            // Toast.makeText(getApplication(), String.valueOf(name1.size()).toString(), Toast.LENGTH_LONG).show();
            return vi;

        }

获取过滤器()

@Override
    public Filter getFilter() {

        // TODO Auto-generated method stub
        Filter filter = new Filter() {

            public void publishResults(CharSequence s, FilterResults results) {
                //Toast.makeText(getApplication(), String.valueOf(name1.size()).toString(), Toast.LENGTH_LONG).show();
                arrayListNames = (List<String>) results.values;
                notifyDataSetChanged();
            }

            @Override
            public FilterResults performFiltering(CharSequence s) {
                search=true;
                FilterResults results = new FilterResults();
                ArrayList<String> FilteredArrayNames = new ArrayList<String>();
             Toast.LENGTH_LONG).show();
                for (int i = 0; i < name1.size(); i++) {

                    String dataNames = name1.get(i).toString();
                    if (dataNames.toLowerCase().trim().startsWith(s.toString()))  {

                        Toast.makeText(getApplication(),s.toString(), Toast.LENGTH_LONG).show();
                        FilteredArrayNames.add(name1.get(i));
                    }
                }

                results.count = FilteredArrayNames.size();
                results.values = FilteredArrayNames;


                return results;
            }
        };

        return filter;
    }
}

Answer 1

MainActivity.java

package com.example.mylistviewtest;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;




public class MainActivity extends Activity {

    private ListView listview;
    private EditText edittext;
    private List<ProfileBean> list; 
    private SearchableAdapter adapter ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        listview = (ListView) findViewById(R.id.listview);
        edittext  = (EditText) findViewById(R.id.edittext);

        list = new ArrayList<ProfileBean>();

        list.add(new ProfileBean("AAA", "AA", "123"));
        list.add(new ProfileBean("AAB", "AB", "100"));
        list.add(new ProfileBean("AAC", "BC", "101"));
        list.add(new ProfileBean("AAD", "DC", "154"));
        list.add(new ProfileBean("BBB", "DF", "22"));
        list.add(new ProfileBean("BBA", "AD", "22"));
        list.add(new ProfileBean("BBD", "FD", "44"));
        list.add(new ProfileBean("BAT", "AD", "44"));
        list.add(new ProfileBean("BBD", "FF", "75"));
        list.add(new ProfileBean("BAD", "AA", "88"));


        adapter = new SearchableAdapter(getApplicationContext(), list);
        listview.setAdapter(adapter);


        edittext.addTextChangedListener(new TextWatcher(){
            @Override
            public void afterTextChanged(Editable arg0) {

            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                adapter.getFilter().filter(s.toString());
            }
        });


        listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                // TODO Auto-generated method stub
                ProfileBean bean = (ProfileBean) arg1.getTag();

                Toast.makeText(getApplicationContext(), bean.getName(), Toast.LENGTH_LONG).show();
            }
        });
    }

}

ProfileBean

package com.example.mylistviewtest;

public class ProfileBean {
    private String name;
    private String lname;
    private String no;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getLname() {
        return lname;
    }
    public void setLname(String lname) {
        this.lname = lname;
    }
    public String getNo() {
        return no;
    }
    public void setNo(String no) {
        this.no = no;
    }
    public ProfileBean(String name, String lname, String no) {
        super();
        this.name = name;
        this.lname = lname;
        this.no = no;
    }



}

SearchableAdapter.java

package com.example.mylistviewtest;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

// The standard text view adapter only seems to search from the beginning of whole words
// so we've had to write this whole class to make it possible to search
// for parts of the arbitrary string we want
public class SearchableAdapter extends BaseAdapter implements Filterable {

private List<ProfileBean>originalData = null;
private List<ProfileBean>filteredData = null;
private LayoutInflater mInflater;
private ItemFilter mFilter = new ItemFilter();

public SearchableAdapter(Context context, List<ProfileBean> data) {
    this.filteredData = data ;
    this.originalData = data ;
    mInflater = LayoutInflater.from(context);
}

public int getCount() {
    return filteredData.size();
}

public Object getItem(int position) {
    return filteredData.get(position);
}

public long getItemId(int position) {
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    // A ViewHolder keeps references to children views to avoid unnecessary calls
    // to findViewById() on each row.
    ViewHolder holder;

    // When convertView is not null, we can reuse it directly, there is no need
    // to reinflate it. We only inflate a new View when the convertView supplied
    // by ListView is null.
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.list_item, null);

        // Creates a ViewHolder and store references to the two children views
        // we want to bind data to.
        holder = new ViewHolder();
        holder.name = (TextView) convertView.findViewById(R.id.name);
        holder.lname = (TextView) convertView.findViewById(R.id.lname);
        holder.no = (TextView) convertView.findViewById(R.id.no);

        // Bind the data efficiently with the holder.

        convertView.setTag(R.layout.list_item,holder);
    } else {
        // Get the ViewHolder back to get fast access to the TextView
        // and the ImageView.
        holder = (ViewHolder) convertView.getTag(R.layout.list_item);
    }

    // If weren't re-ordering this you could rely on what you set last time

    ProfileBean bean = filteredData.get(position);
    holder.name.setText(bean.getName());
    holder.lname.setText(bean.getLname());
    holder.no.setText(bean.getNo());
    convertView.setTag(bean);

    return convertView;
}

static class ViewHolder {
    TextView name;
    TextView lname;
    TextView no;
}

public Filter getFilter() {
    return mFilter;
}

private class ItemFilter extends Filter {
    @Override
    protected FilterResults performFiltering(CharSequence constraint) {

        String filterString = constraint.toString().toLowerCase();

        FilterResults results = new FilterResults();

        final List<ProfileBean> list = originalData;

        int count = list.size();
        final ArrayList<ProfileBean> nlist = new ArrayList<ProfileBean>(count);

        String filterableString ;

        for (int i = 0; i < count; i++) {

            ProfileBean bean =  list.get(i);
            filterableString = bean.getName();
            if (filterableString.toLowerCase().contains(filterString)) {
                nlist.add(bean);
            }
        }

        results.values = nlist;
        results.count = nlist.size();

        return results;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {
        filteredData = (ArrayList<ProfileBean>) results.values;
        notifyDataSetChanged();
    }

}
}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/edittext"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <ListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >
    </ListView>

</LinearLayout>

list_item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/name"
        android:layout_width="100dp"
        android:layout_height="fill_parent"
        android:padding="10dp"
        android:textColor="@android:color/black"
        android:textSize="16sp" >
    </TextView>

    <TextView
        android:id="@+id/lname"
        android:layout_width="100dp"
        android:layout_height="fill_parent"
        android:padding="10dp"
        android:textColor="@android:color/black"
        android:textSize="16sp" >
    </TextView>

    <TextView
        android:id="@+id/no"
        android:layout_width="100dp"
        android:layout_height="fill_parent"
        android:padding="10dp"
        android:textColor="@android:color/black"
        android:textSize="16sp" >
    </TextView>

</LinearLayout>