0826Android基础Gallery+GridView+Spinner+AutoCompleteTextView+ExpandableListView

Gallery

进行横向图片的滚动，代码部分除了布局文件和昨天的不一样，也使用适配器，用法和ListView基本一样。几个属性方法：spacing左右离开一段距离，可赋负值
unselectAlpha设置未选中的透明度，传入float值

//布局文件
<Gallery
android:id="@+id/gallery"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:spacing="20dp"
android:unselectedAlpha="0.5"></Gallery>

//插入的view
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">

<ImageView
android:id="@+id/img_fruit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/apple"
/>

<TextView
android:id="@+id/tv_fruit"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>

效果

GridView

　　使用适配器，用法和ListView相同。他和ListView的区别在于他可以多行显示，而ListView只能单行显示。android:numColumns=”4”，定义4行.

　　代码中插入的View和上面一样

//布局文件中
<GridView
android:id="@+id/gv_fruits"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:numColumns="4"></GridView>

　　然后捏，昨儿做了个作业，用GridView和ImageView来仿照qq的添加照片多选界面来做个Demo。

　　 昨晚想了一晚上没想明白，今儿老师给讲了讲。

　　 在上面例子的前提上做的，难点在于如何点击图片然后让相应的item整个变色。自己想来想去打算用蒙版和设置透明度来做来着，可是点击事件那儿一点思路都没有，无法将点击事件与变化整个item的颜色联系起来。老师的方法让我豁然开朗，并不是只有点击事件才能触发改变，最简单的if_else语句也可以。方法的重点在于用mManagerCheckBox[]数组用作判断是否应该变色，然后通过ImageView的setVisiblity来设置是否可见。

　　布局时注意要设置checkbox中：android:focusable=”false”；还有ImageView中android:visibility=”invisible”

　　具体布局和代码如下：

//布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>

<CheckBox
android:id="@+id/checkbox_fruit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="false"
android:layout_alignParentRight="true"/>

<ImageView
android:id="@+id/img_fruit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/apple"
android:layout_centerInParent="true"
android:layout_margin="10dp"/>

<TextView
android:id="@+id/tv_fruit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="苹果"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_below="@id/img_fruit"
android:gravity="center"
android:padding="15dp"
/>
<ImageView
android:id="@+id/img_tint"
android:layout_width="70dp"
android:layout_height="100dp"
android:layout_alignLeft="@id/img_fruit"
android:layout_alignTop="@id/img_fruit"
android:background="@color/pink"
android:visibility="invisible"/>

</RelativeLayout>

//适配器
public class FruitsAdapter extends BaseAdapter {
private List<Fruits> mFruits;
private LayoutInflater mInflater;
private boolean[] mManagerCheckBox;

public FruitsAdapter(List<Fruits> mFruits, LayoutInflater mInflater) {
this.mFruits = mFruits;
this.mInflater = mInflater;
mManagerCheckBox=new boolean[mFruits.size()];
}

public void expandClickArea(int position){
mManagerCheckBox[position]=!mManagerCheckBox[position];
notifyDataSetChanged();
}

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

@Override
public Object getItem(int position) {
return position;
}

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder vh=null;
if (convertView==null){
vh=new ViewHolder();
convertView=mInflater.inflate(R.layout.fruits_item_gridview,null);
vh.checkbox_fruit= (CheckBox) convertView.findViewById(R.id.checkbox_fruit);
vh.img_fruit= (ImageView) convertView.findViewById(R.id.img_fruit);
vh.tv_fruit= (TextView) convertView.findViewById(R.id.tv_fruit);
vh.img_tint= (ImageView) convertView.findViewById(R.id.img_tint);
convertView.setTag(vh);
}else{
vh= (ViewHolder) convertView.getTag();
}
Fruits fruits=mFruits.get(position);
vh.tv_fruit.setText(fruits.getName());
vh.img_fruit.setImageResource(fruits.getImg());
vh.checkbox_fruit.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
mManagerCheckBox[position]=isChecked;
notifyDataSetChanged();
}
});
vh.checkbox_fruit.setChecked(mManagerCheckBox[position]);
if(mManagerCheckBox[position]){
vh.img_tint.setVisibility(View.VISIBLE);
}else{
vh.img_tint.setVisibility(View.INVISIBLE);
}
return convertView;
}
class ViewHolder{
ImageView img_fruit;
TextView tv_fruit;
CheckBox checkbox_fruit;
ImageView img_tint;
}
}

//活动
public class MainActivity extends Activity {
private GridView mGfruits;
private List<Fruits> mFruits;
private LayoutInflater mInflater;
private FruitsAdapter mAdapter;
private ImageView mImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mGfruits = (GridView) findViewById(R.id.gv_fruits);
mImage= (ImageView) findViewById(R.id.img_fruit);
mInflater = getLayoutInflater();
initmFruit();
mAdapter = new FruitsAdapter(mFruits, mInflater);
//      系统调用适配器中的方法
mGfruits.setAdapter(mAdapter);
mGfruits.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
mAdapter.expandClickArea(position);
Toast.makeText(getApplicationContext(),position+1+"",Toast.LENGTH_SHORT).show();

}
});
}

private void initmFruit() {
mFruits = new ArrayList<>();
for (int i=0;i<10;i++) {
Fruits apple = new Fruits(R.mipmap.apple, "苹果");
Fruits orange = new Fruits(R.mipmap.orange, "橘子");
Fruits lemon = new Fruits(R.mipmap.lemon, "柠檬");
mFruits.add(apple);
mFruits.add(orange);
mFruits.add(lemon);
}
}
}

Spinner+AutoCompleteTextView

　　下拉选择+搜索。这次没有用自定义adapter写，用了比较简单的ArrayAdapter来举例的。

//布局
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.laowang.android0826.SecondActivity">

<AutoCompleteTextView
android:id="@+id/auto_textview"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"></Spinner>

</RelativeLayout>

//活动
public class SecondActivity extends Activity {
private AutoCompleteTextView mAuto_textview;
private Spinner mSpinner;
//    private ArrayAdapter<String> mAdapter;
private String[] mData={"layout_linear","layout_relative","layout_frame","view_text","view_img","view_edit","include"};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
mAuto_textview= (AutoCompleteTextView) findViewById(R.id.auto_textview);
mSpinner= (Spinner) findViewById(R.id.spinner);
ArrayAdapter<String> mAdapter1=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,mData);
mAuto_textview.setAdapter(mAdapter1);
ArrayAdapter<String> mAdapter2=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,mData);
mSpinner.setAdapter(mAdapter2);
}
}

ExpandableListView

　　这家伙说白了就是ListView的加强版,简直就是一个ListView中又加了一个ListView。今天写的Demo的效果是，班级view作为外部，学生view作为内部，点开班级后可以看到学生view

//布局文件
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<ExpandableListView
android:id="@+id/expandablelistview"
android:layout_width="match_parent"
android:layout_height="match_parent"
></ExpandableListView>
</LinearLayout>

注：箭头可以点开，类似于qq中的分组。

//插入的View
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center|left"
android:background="@color/blue">
<TextView
android:id="@+id/textview_clazz_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="40dp"
/>

<TextView
android:id="@+id/textview_clazz_num"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>

<TextView
android:id="@+id/textview_clazz_students"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:orientation="horizontal">

<TextView
android:id="@+id/textview_student_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
/>

<TextView
android:id="@+id/textview_student_age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

<TextView
android:id="@+id/textview_student_sex"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
/>
</LinearLayout>

//班级类，外侧
public class Clazz  {
private String clazzName;
private String clazzNum;
private List<Student> students;

public Clazz(String clazzName, String clazzNum) {
this.clazzName = clazzName;
this.clazzNum = clazzNum;
}

public String getClazzName() {
return clazzName;
}

public void setClazzName(String clazzName) {
this.clazzName = clazzName;
}

public List<Student> getStudents() {
return students;
}

public void setStudents(List<Student> students) {
this.students = students;
}

public String getClazzNum() {
return clazzNum;
}

public void setClazzNum(String clazzNum) {
this.clazzNum = clazzNum;
}
}

//学生类，内部
public class Student {
private String studentName;
private String studentAge;
private String studentSex;

public Student( String studentName, String studentAge,String studentSex) {
this.studentSex = studentSex;
this.studentName = studentName;
this.studentAge = studentAge;
}

public String getStudentName() {
return studentName;
}

public void setStudentName(String studentName) {
this.studentName = studentName;
}

public String getStudentSex() {
return studentSex;
}

public void setStudentSex(String studentSex) {
this.studentSex = studentSex;
}

public String getStudentAge() {
return studentAge;
}

public void setStudentAge(String studentAge) {
this.studentAge = studentAge;
}

}

　　这家伙难写就在于他的adapter和数据的初始化上面。因为adapter要写group的和child的，然后child要通过group得到。数据初始化是要记得将内部的数据设置在外部的数据中（外部set[内部]）。adapter继承BaseExpandableListAdapter。

//重头戏自定义adapter
public class MyExpandableAdapter extends BaseExpandableListAdapter {
private List<Clazz> mClazzs;
private LayoutInflater mInflater;

public MyExpandableAdapter(List<Clazz> mClazzs, LayoutInflater mInflater) {
this.mClazzs = mClazzs;
this.mInflater = mInflater;
}

@Override
public int getGroupCount() {
return mClazzs.size();
}

@Override
public int getChildrenCount(int groupPosition) {
return mClazzs.get(groupPosition).getStudents().size();
}

@Override
public Object getGroup(int groupPosition) {
return groupPosition;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
return childPosition;
}

@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}

@Override
public boolean hasStableIds() {
return false;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
ViewHolderClazz vhClazz=null;
if(convertView==null){
vhClazz=new ViewHolderClazz();
convertView=mInflater.inflate(R.layout.item_clazz,null);
vhClazz.textViewClazzName= (TextView) convertView.findViewById(R.id.textview_clazz_name);
vhClazz.textViewClazzNum= (TextView) convertView.findViewById(R.id.textview_clazz_num);
vhClazz.textViewClazzStudents= (TextView) convertView.findViewById(R.id.textview_clazz_students);
convertView.setTag(vhClazz);
}else{
vhClazz= (ViewHolderClazz) convertView.getTag();
}
Clazz clazz=mClazzs.get(groupPosition);

vhClazz.textViewClazzName.setText(clazz.getClazzName());
vhClazz.textViewClazzNum.setText(clazz.getClazzNum());
//       为啥子要+个“”?clazz.getStudents().size()是int类型的，setText中加的是String类型的
vhClazz.textViewClazzStudents.setText(""+clazz.getStudents().size());
return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ViewHolderStudent vhStudent=null;
if(convertView==null){
vhStudent=new ViewHolderStudent();
convertView=mInflater.inflate(R.layout.item_student,null);
vhStudent.textViewStudentName= (TextView) convertView.findViewById(R.id.textview_student_name);
vhStudent.textViewStudentAge= (TextView) convertView.findViewById(R.id.textview_student_age);
vhStudent.textViewStudentSex= (TextView) convertView.findViewById(R.id.textview_student_sex);
convertView.setTag(vhStudent);
}else{
vhStudent= (ViewHolderStudent) convertView.getTag();
}
//        有点乱，好好看
Clazz clazz=mClazzs.get(groupPosition);
List<Student> students=clazz.getStudents();
Student student=students.get(childPosition);

vhStudent.textViewStudentName.setText(student.getStudentName());
vhStudent.textViewStudentAge.setText(student.getStudentAge());
vhStudent.textViewStudentSex.setText(student.getStudentSex());
return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
class ViewHolderClazz{
TextView textViewClazzName;
TextView textViewClazzNum;
TextView textViewClazzStudents;

}
class ViewHolderStudent{
TextView textViewStudentName;
TextView textViewStudentAge;
TextView textViewStudentSex;
}
}

//活动
public class MainActivity extends Activity {
private ExpandableListView mEListView;
private List<Clazz> mClazzs;
private MyExpandableAdapter mAdapter;
private LayoutInflater mInflater;

public MainActivity() {
}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEListView= (ExpandableListView) findViewById(R.id.expandablelistview);
initdata();
mInflater=getLayoutInflater();
mAdapter=new MyExpandableAdapter(mClazzs,mInflater);
mEListView.setAdapter(mAdapter);
}

private void initdata() {
mClazzs =new ArrayList<>();

//        creatStudent();
Clazz clazz1=new Clazz("一班","201501");
List<Student> students1=new ArrayList<>();
students1.add(new Student("张一","18","男"));
students1.add(new Student("张二","19","女"));
students1.add(new Student("张三","20","男"));
students1.add(new Student("张四","21","女"));
//      一定要记得把学生添加到班级里
clazz1.setStudents(students1);
Clazz clazz2=new Clazz("二班","201502");
List<Student> students2=new ArrayList<>();
students2.add(new Student("王一","18","男"));
students2.add(new Student("王二","19","女"));
students2.add(new Student("王三","20","男"));
students2.add(new Student("王四","21","女"));
clazz2.setStudents(students2);
Clazz clazz3=new Clazz("三班","201503");
List<Student> students3=new ArrayList<>();
students3.add(new Student("李一","18","男"));
students3.add(new Student("李二","19","女"));
students3.add(new Student("李三","20","男"));
students3.add(new Student("李四","21","女"));
clazz3.setStudents(students3);
Clazz clazz4=new Clazz("四班","201504");
List<Student> students4=new ArrayList<>();
students4.add(new Student("刘一","18","男"));
students4.add(new Student("刘二","19","女"));
students4.add(new Student("刘三","20","男"));
students4.add(new Student("刘四","21","女"));
students4.add(new Student("李一","18","男"));
students4.add(new Student("李二","19","女"));
students4.add(new Student("李三","20","男"));
students4.add(new Student("李四","21","女"));
clazz4.setStudents(students4);
mClazzs.add(clazz1);
mClazzs.add(clazz2);
mClazzs.add(clazz3);
mClazzs.add(clazz4);
}

private void creatStudent() {

}

}

　　最后做出来的效果，用老师的一句话说就是：透着一股浓浓的山寨味儿╮(╯▽╰)╭