AutoCompleteTextView和Scroll

AutoCompleteTextVIew MultiAutoCompleteTextView

最简单的使用

xml布局文件

    <!--    completionThreshold : 提示几个    completionHint : 自动补全 (    -->    <AutoCompleteTextView        android:id="@+id/main_auto"        android:completionHint="自动补全"        android:completionThreshold="1"        android:layout_width="match_parent"        android:layout_height="wrap_content" />

Activity.java

List<String> list = new ArrayList<>();list.add("北京");list.add("上海");list.add("广东");list.add("上海");list.add("上海");list.add("上海");list.add("山东");list.add("山东");list.add("山东");ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, list);AutoCompleteTextView auto= (AutoCompleteTextView) findViewById(R.id.main_auto);auto.setAdapter(adapter);

自定义拼音, 自动补全

布局文件还是使用上面的

写个实体类, 还有文字和相应的拼音

public class Entry {    private String text;//显示的数据    private String pinyin;//过滤的数据    public Entry(String text, String pinyin) {        this.text = text;        this.pinyin = pinyin;    }    public String getText() {        return text;    }    public void setText(String text) {        this.text = text;    }    public String getPinyin() {        return pinyin;    }    public void setPinyin(String pinyin) {        this.pinyin = pinyin;    }    @Override    public String toString() {        return text;    }}

AutoActivity.java

此处需要注意: public ＜ T extends ListAdapter & Filterable ＞ void setAdapter(T adapter)
这就说明这个适配器, 在需要ListAdapter和Filterable, 所以应该像下面这样写:

package com.lulu.day23;import android.content.Context;import android.text.TextUtils;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Filter;import android.widget.Filterable;import android.widget.TextView;import java.util.ArrayList;import java.util.Collection;import java.util.List;/** * Created by Lulu on 2016/8/27. * * Filterable: 过滤器 */public class AutoAdapter extends BaseAdapter implements Filterable {    //所有跟画面相关的都需要一个context    private Context context;    private List<Entry> list;    private List<Entry> backup;    private Filter filter;    public AutoAdapter(Context context, List<Entry> list) {        this.context = context;        this.list = list;    }    @Override    public int getCount() {        return list.size();    }    //得到数据源中的一条数据    @Override    public Object getItem(int position) {        return list.get(position);    }    //返回当前ID    @Override    public long getItemId(int position) {        return position;    }    //指定位置的元素该如何展示在view上    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = new TextView(context);        }        ((TextView) convertView).setText(list.get(position).getText());        return convertView;    }    @Override    public Filter getFilter() {        if (filter == null) {            filter = new AutoFilter();       }        return filter;    }    /**过滤     * 一定要用非静态的内部类     */    public class AutoFilter extends Filter{        @Override//产生过滤结果        protected FilterResults performFiltering(CharSequence constraint) {            if (backup == null) {                backup = new ArrayList<>(list);            }            FilterResults results = new FilterResults();            if (!TextUtils.isEmpty(constraint)) {                List<Entry> entries = new ArrayList<>();                for (Entry  entry: backup) {                    String pinyin = entry.getPinyin();                    if (pinyin.startsWith(constraint.toString())) {                        entries.add(entry);                    }                }                results.count = entries.size();                results.values = entries;            } else {                results.count = 0;                results.values = new ArrayList<>();            }            return results;        }        @Override        protected void publishResults(CharSequence constraint, FilterResults results) {            list.clear();            list.addAll((Collection<? extends Entry>) results.values);            notifyDataSetChanged();        }    }}

MainActivity.java

 List<Entry> list = new ArrayList<>(); list.add(new Entry("北京", "beijing")); list.add(new Entry("上海", "shanghai")); list.add(new Entry("广东", "guangdong")); list.add(new Entry("", "shandong")); list.add(new Entry("上海", "shagnhai")); list.add(new Entry("上海", "shagnhai")); AutoAdapter adapter = new AutoAdapter(this, list); AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.main_auto); auto.setAdapter(adapter);

使用第三方包来实现拼音自动补全

使用的第三方的名字为: com.github.stuxuhai:jpinyin:1.1.7, 需要手动引入

PinyinAdapter.java

package com.lulu.day23;import android.content.Context;import android.text.TextUtils;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Filter;import android.widget.Filterable;import android.widget.TextView;import com.github.stuxuhai.jpinyin.PinyinException;import com.github.stuxuhai.jpinyin.PinyinFormat;import com.github.stuxuhai.jpinyin.PinyinHelper;import java.util.ArrayList;import java.util.Collection;import java.util.List;/** * Created by Lulu on 2016/8/27. */public class PinyinAdapter extends BaseAdapter implements Filterable {    private Context context;    private List<String> list;    private List<String> backup;    private Filter filter;    public PinyinAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int position) {        return list.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        if (convertView == null) {            convertView = new TextView(context);    }        ((TextView) convertView).setText(list.get(position));        return convertView;    }    @Override    public Filter getFilter() {        if (filter == null) {            filter = new PinyinFilter();        }        return filter;    }    private class PinyinFilter extends Filter {        //必须要备份        @Override        protected FilterResults performFiltering(CharSequence constraint) {            if (backup == null) {                backup = new ArrayList<>(list);            }            FilterResults results = new FilterResults();            if (!TextUtils.isEmpty(constraint)) {                List<String> strings = new ArrayList<>();                for (String str : backup) {                    try {                        String pinyin = PinyinHelper.convertToPinyinString(str, "", PinyinFormat.WITH_TONE_MARK);                        if (pinyin.contains(constraint)) {                            strings.add(str);                        } else {                            String shortPinyin = PinyinHelper.getShortPinyin(str);                            if (shortPinyin.contains(constraint)) {                                strings.add(str);                            }                        }                    } catch (PinyinException e) {                        e.printStackTrace();                    }                    results.count = strings.size();                    results.values = strings;                }            } else {                results.count = 0;                results.values = new ArrayList<>();            }            return results;        }        @Override        protected void publishResults(CharSequence constraint, FilterResults results) {            list.clear();            list.addAll((Collection<? extends String>) results.values);            notifyDataSetChanged();        }    }}

MainActivity.java

 List<String> list = new ArrayList<>(); list.add("北京"); list.add("上海"); list.add("广东"); list.add("上海"); list.add("上海"); list.add("上海"); list.add("山东"); list.add("山东"); list.add("山东"); PinyinAdapter adapter = new PinyinAdapter(this, list); AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.main_auto); auto.setAdapter(adapter);

简单的介绍一下MultiAutoCompleteTextView的使用方法

布局文件

   <!--可以补全多个词-->   <MultiAutoCompleteTextView       android:completionThreshold="1"       android:layout_centerInParent="true"       android:id="@+id/mian_muti"       android:layout_width="match_parent"       android:layout_height="wrap_content" />

MainActivity.java

MultiAutoCompleteTextView multi = (MultiAutoCompleteTextView) findViewById(R.id.mian_muti);multi.setAdapter(adapter);MultiAutoCompleteTextView.CommaTokenizer tokenizer = new MultiAutoCompleteTextView.CommaTokenizer();tokenizer.terminateToken(",");multi.setTokenizer(tokenizer);

Scroll

同样的道理, 我们一般不会使用原生的Sroll而是使用v4包中的android.support.v4.widget.NestedScrollView

垂直滚动 - 固定表头滑动

继承自FrameLayout, 但是只能放一个子控件, 多个会报错
一般会放一个布局
如果有高度需求: 我们需要使用minHeight 只能给定值
scrollbars=”none: 将滚动条去掉
scrollbarStyle 在里面还是在外面
scrollbarTrackVertical：滚动框
scrollbarThumbVertical : 进度条样式
elevation : 海拔
有些控件默认有海拔, 所有要添加海拔高度覆盖
对于垂直方向来说, ScrollView中的子控件高度是无效的(都是根据父控件的高低来的, 高度未知)
若想在垂直方向有长度, 可以使用minHeight

先查看它的预览效果:

xml 布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.lulu.day23_scroll_lxy.MainActivity">    <!--    ScrollView        继承自FrameLayout, 但是只能放一个子控件, 多个会报错        一般会放一个布局        ScrollView中的子控件高度是无效的(都是根据父控件的高低来的, 高度未知)        如果有高度需求: 我们需要使用minHeight 只能给定值        scrollbars="none: 将滚动条去掉        scrollbarStyle 在里面还是在外面        scrollbarTrackVertical：滚动框        scrollbarThumbVertical : 进度条样式        elevation : 海拔        有些控件默认有海拔    -->    <TextView        android:elevation="5dp"        android:text="@string/app_name"        android:id="@+id/main_floating"        android:textSize="30sp"        android:background="#fff"        android:layout_width="match_parent"        android:layout_height="wrap_content" />    <android.support.v4.widget.NestedScrollView        android:id="@+id/main_scroll"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:scrollbarSize="10dp"        android:scrollbars="vertical"        >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="match_parent"            android:background="#f00"            android:minHeight="400dp"            android:orientation="vertical">            <TextView                android:background="#fff"                android:text="第一组"                android:textSize="30sp"                android:layout_width="match_parent"                android:layout_height="wrap_content" />            <ImageView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:src="@mipmap/ic_launcher" />            <ImageView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:src="@mipmap/ic_launcher" />                ...            <TextView                android:background="#fff"                android:text="第八组"                android:textSize="30sp"                android:layout_width="match_parent"                android:layout_height="wrap_content" />            <ImageView                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:src="@mipmap/ic_launcher" />        </LinearLayout>    </android.support.v4.widget.NestedScrollView></RelativeLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity implements NestedScrollView.OnScrollChangeListener{    private NestedScrollView scrollView;    private TextView floating;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        scrollView = (NestedScrollView) findViewById(R.id.main_scroll);        floating = ((TextView) findViewById(R.id.main_floating));        scrollView.setOnScrollChangeListener(this);        floating.setText("第一组");    }    @Override    public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {        //因为在ScrollVIew中包裹了一层LinerLayout        LinearLayout layout = (LinearLayout) v.getChildAt(0);        //在屏幕上方外部最后一个(部分)        TextView text1 = null;        //在屏幕中的第一个(完全)        TextView text2 = null;        for (int i = 0; i < layout.getChildCount(); i++) {            View view = layout.getChildAt(i);            if(view.getTop() > scrollY) {                if(view instanceof  TextView) {                    text2 = (TextView)view;                }                break;            }            if(view instanceof TextView) {                text1 = (TextView) view;            }        }        floating.setText(text1.getText());        if (text2 != null) {            int offset = text2.getTop() - scrollY;            floating.setTranslationY(                    Math.min(offset - text2.getHeight(), 0)            );        } else {            floating.setTranslationY(0);        }    }}