1. 高级控件与低级控件区别
是否使用适配器
2. 适配器种类和作用
2.1 种类
数组适配器 ArrayAdapter
new ArrayAdapter<String>(this,R.layout.actv_style, names);
简单适配器 SimpleAdapter
也叫“并不简单的简单适配器”^_^
自定义适配器
2.2 作用
桥梁
展示
3. 高级控件使用步骤
3.1 获取数据
3.2 创建适配器
3.3 绑定适配器
4. 自动提示文本框
4.1 AutoCompleteTextView(单一提示)
android:completionThreshold="1"
4.2 MultiAutoCompleteTextView(多次提示)--作业
//设置多次提示时,设置分隔符方法
//逗号(默认)
Tokenizer t = new MultiAutoCompleteTextView.CommaTokenizer();
mactv_main.setTokenizer(t);
//分号(可以设置为任何符号)
<MultiAutoCompleteTextView
android:id="@+id/mact_main_mact1"
android:hint="多次查询"
android:completionThreshold="1"
android:layout_width="match_parent"
android:layout_height="60dp" />
添加这个SemicolonTokenizer类到项目中,并将macTextView.setTokenizer(newMultiAutoCompleteTextView.CommaTokenizer());改为macTextView.setTokenizer(new SemicolonTokenizer(‘;’));即可
附录:SemicolonTokenizer类代码
import android.text.SpannableString;
import android.text.Spanned;
import android.text.TextUtils;
import android.widget.MultiAutoCompleteTextView.Tokenizer;
public class SemicolonTokenizer implements Tokenizer {
private char charS;
private String mSTring;
public SemicolonTokenizer(char charS) {
this.charS = charS;
mSTring = String.valueOf(charS);
}
public int findTokenStart(CharSequence text, int cursor) {
int i = cursor;
while (i > 0 && text.charAt(i - 1) != charS) {
i--;
}
while (i < cursor && text.charAt(i) == ' ') {
i++;
}
return i;
}
public int findTokenEnd(CharSequence text, int cursor) {
int i = cursor;
int len = text.length();
while (i < len) {
if (text.charAt(i) == charS) {
return i;
} else {
i++;
}
}
return len;
}
public CharSequence terminateToken(CharSequence text) {
int i = text.length();
while (i > 0 && text.charAt(i - 1) == ' ') {
i--;
}
if (i > 0 && text.charAt(i - 1) == charS) {
return text;
} else {
if (text instanceof Spanned) {
SpannableString sp = new SpannableString(text + mSTring);
TextUtils.copySpansFrom((Spanned) text, 0, text.length(), Object.class, sp, 0);
return sp;
} else {
return text + mSTring;
}
}
}
}
4.3 两种自动提示文本框的异同
AutoCompleteTextView:支持基本的自动完成功能,适用在各种搜索功能中,并且可以根据自己的需求设置他的默认显示数据
MultiAutoCompleteTextView: 可支持选择多个值(在多次输入的情况下),分别用分隔符分开,并且在每个值选中的时候再次输入值时会自动去匹配。
可用在发短信,发邮件时选择联系人这种类型当中。
5. 下拉框
Spinner
素材 :
布局文件:activity_main.xml:
import android.text.SpannableString;
import android.text.Spanned;
import android.text.TextUtils;
import android.widget.MultiAutoCompleteTextView.Tokenizer;
public class SemicolonTokenizer implements Tokenizer {
private char charS;
private String mSTring;
public SemicolonTokenizer(char charS) {
this.charS = charS;
mSTring = String.valueOf(charS);
}
public int findTokenStart(CharSequence text, int cursor) {
int i = cursor;
while (i > 0 && text.charAt(i - 1) != charS) {
i--;
}
while (i < cursor && text.charAt(i) == ' ') {
i++;
}
return i;
}
public int findTokenEnd(CharSequence text, int cursor) {
int i = cursor;
int len = text.length();
while (i < len) {
if (text.charAt(i) == charS) {
return i;
} else {
i++;
}
}
return len;
}
public CharSequence terminateToken(CharSequence text) {
int i = text.length();
while (i > 0 && text.charAt(i - 1) == ' ') {
i--;
}
if (i > 0 && text.charAt(i - 1) == charS) {
return text;
} else {
if (text instanceof Spanned) {
SpannableString sp = new SpannableString(text + mSTring);
TextUtils.copySpansFrom((Spanned) text, 0, text.length(), Object.class, sp, 0);
return sp;
} else {
return text + mSTring;
}
}
}
}
MainActivity.java:
public class MainActivity extends AppCompatActivity {
private AutoCompleteTextView atv_content;
private MultiAutoCompleteTextView matv_content;
private static final String[] data = new String[]{
"小猪猪", "小狗狗", "小鸡鸡", "小猫猫", "小咪咪"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
atv_content = (AutoCompleteTextView) findViewById(R.id.atv_content);
matv_content = (MultiAutoCompleteTextView) findViewById(R.id.matv_content);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.
this, android.R.layout.simple_dropdown_item_1line, data);
atv_content.setAdapter(adapter);
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_dropdown_item_1line, data);
matv_content.setAdapter(adapter);
matv_content.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
}
}
部分代码分析
1:android:completionThreshold="1":这里我们设置了输入一个字就显示提示
2:android:completionHint="请输入搜索内容":这是框框底部显示的文字,如果觉得丑 可以android:completionHintView设置一个View!
3:android:dropDownHorizontalOffset="5dp":设置了水平边距为5dp
4:matv_content.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer()); setTokenizer是为其设置分隔符