編輯：關於Android編程
xml布局文件
Activity.java
Listlist = new ArrayList<>(); list.add("北京"); list.add("上海"); list.add("廣東"); list.add("上海"); list.add("上海"); list.add("上海"); list.add("山東"); list.add("山東"); list.add("山東"); ArrayAdapter adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, list); AutoCompleteTextView auto= (AutoCompleteTextView) findViewById(R.id.main_auto); auto.setAdapter(adapter);
布局文件還是使用上面的
寫個實體類, 還有文字和相應的拼音
public class Entry {
private String text;//顯示的數據
private String pinyin;//過濾的數據
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
此處需要注意: public ＜ T extends ListAdapter & Filterable ＞ void setAdapter(T adapter)
這就說明這個適配器, 在需要ListAdapter和Filterable, 所以應該像下面這樣寫:
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: 過濾器
*/
public class AutoAdapter extends BaseAdapter implements Filterable {
//所有跟畫面相關的都需要一個context
private Context context;
private List list;
private List backup;
private Filter filter;
public AutoAdapter(Context context, List list) {
this.context = context;
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
//得到數據源中的一條數據
@Override
public Object getItem(int position) {
return list.get(position);
}
//返回當前ID
@Override
public long getItemId(int position) {
return position;
}
//指定位置的元素該如何展示在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;
}
/**過濾
* 一定要用非靜態的內部類
*/
public class AutoFilter extends Filter{
@Override//產生過濾結果
protected FilterResults performFiltering(CharSequence constraint) {
if (backup == null) {
backup = new ArrayList<>(list);
}
FilterResults results = new FilterResults();
if (!TextUtils.isEmpty(constraint)) {
List 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) results.values);
notifyDataSetChanged();
}
}
}
MainActivity.java
Listlist = new ArrayList<>(); list.add(new Entry("北京", "beijing")); list.add(new Entry("上海", "shanghai")); list.add(new Entry("廣東", "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);
使用的第三方的名字為: com.github.stuxuhai:jpinyin:1.1.7, 需要手動引入
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 list;
private List backup;
private Filter filter;
public PinyinAdapter(Context context, List 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 {
//必須要備份
@Override
protected FilterResults performFiltering(CharSequence constraint) {
if (backup == null) {
backup = new ArrayList<>(list);
}
FilterResults results = new FilterResults();
if (!TextUtils.isEmpty(constraint)) {
List 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) results.values);
notifyDataSetChanged();
}
}
}
MainActivity.java
Listlist = new ArrayList<>(); list.add("北京"); list.add("上海"); list.add("廣東"); list.add("上海"); list.add("上海"); list.add("上海"); list.add("山東"); list.add("山東"); list.add("山東"); PinyinAdapter adapter = new PinyinAdapter(this, list); AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.main_auto); auto.setAdapter(adapter);
布局文件
MainActivity.java
MultiAutoCompleteTextView multi = (MultiAutoCompleteTextView) findViewById(R.id.mian_muti);
multi.setAdapter(adapter);
MultiAutoCompleteTextView.CommaTokenizer tokenizer = new MultiAutoCompleteTextView.CommaTokenizer();
tokenizer.terminateToken(",");
multi.setTokenizer(tokenizer);
同樣的道理, 我們一般不會使用原生的Sroll而是使用v4包中的android.support.v4.widget.NestedScrollView
繼承自FrameLayout, 但是只能放一個子控件, 多個會報錯
一般會放一個布局
如果有高度需求: 我們需要使用minHeight 只能給定值
scrollbars=”none: 將滾動條去掉
scrollbarStyle 在裡面還是在外面
scrollbarTrackVertical：滾動框
scrollbarThumbVertical : 進度條樣式
elevation : 海拔
有些控件默認有海拔, 所有要添加海拔高度覆蓋
對於垂直方向來說, ScrollView中的子控件高度是無效的(都是根據父控件的高低來的, 高度未知)
若想在垂直方向有長度, 可以使用minHeight
先查看它的預覽效果:
![描述](https://www.android5.online/Android/UploadFiles_5356/201702/2017022217144524.gif "\")
xml 布局文件<喎?/kf/ware/vc/" target="_blank" class="keylink">vc3Ryb25nPjwvcD4NCjxwcmUgY2xhc3M9"brush:java;">
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("第一組");
}
@Override
public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
//因為在ScrollVIew中包裹了一層LinerLayout
LinearLayout layout = (LinearLayout) v.getChildAt(0);
//在屏幕上方外部最後一個(部分)
TextView text1 = null;
//在屏幕中的第一個(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);
}
}
}
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