文章目录
1.下拉列表Spinner
1.数组适配器ArrayAdapter
最简单的适配器，只展示一行文字。
- 编写列表项的XML文件，内部布局只有一个TextView标签。
- 调用ArrayAdapter的构造方法，填入待展现的字符串数组，以及列表项的XML文件。
- 调用下拉框控件的setAdapter方法，传入第二部得到的适配器实例。
java
public class SpinnerDropdownActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
private final static String[] startArray = {"水星","金星","地球","火星","木星"};
private Spinner sp_dropdown;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_spinner_dropdown);
sp_dropdown = findViewById(R.id.sp_dropdown);
// 声明一个下拉列表的数组适配器
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, R.layout.item_select, startArray);
sp_dropdown.setAdapter(adapter);
// 默认选择第一个
sp_dropdown.setSelection(0);
sp_dropdown.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
ToastUtil.show(this, "选中了：" + startArray[position]);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
2.简单适配器SimpleAdapter
SimpleAdapter允许在列表项中同时展示文本和图片。
java
public class SpinnerIconActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
private static final int[] iconArray = {
R.drawable.ikun,R.drawable.ikun,R.drawable.ikun,R.drawable.ikun,R.drawable.ikun
};
private static final String[] iconTextArray = {
"IKUN1","IKUN2","IKUN3","IKUN4","IKUN5"
};
private Spinner sp_icon;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_spinner_icon);
sp_icon = findViewById(R.id.sp_icon);
List<Map<String,Object>> list = new ArrayList<>();
for(int i=0;i< iconArray.length;i++){
Map<String,Object> item = new HashMap<>();
item.put("icon", iconArray[i]);
item.put("name", iconTextArray[i]);
list.add(item);
}
SimpleAdapter adapter = new SimpleAdapter(this, list,R.layout.item_simple,new String[]{"icon","name"},new int[]{R.id.iv_icon,R.id.tv_name});
sp_icon.setAdapter(adapter);
sp_icon.setSelection(0);
sp_icon.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
ToastUtil.show(this,"选中了：" + iconTextArray[position]);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
3.基本适配器BaseAdapter
BaseAdapter是一种适应性更强的基本适配器。
java
public class CustomBaseAdapter extends BaseAdapter {
private Context mContext;
private List<Planet> mPlanets;
public CustomBaseAdapter(Context context, List<Planet> planets) {
mContext = context;
mPlanets = planets;
}
@Override
public int getCount() {
return mPlanets.size();
}
@Override
public Object getItem(int position) {
return mPlanets.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = LayoutInflater.from(mContext).inflate(R.layout.item_list, null);
ImageView iv_icon = view.findViewById(R.id.iv_icon);
TextView tv_name = view.findViewById(R.id.tv_name);
TextView tv_desc = view.findViewById(R.id.tv_desc);
// 给控件设置好数据
iv_icon.setImageResource(mPlanets.get(position).image);
tv_name.setText(mPlanets.get(position).name);
tv_desc.setText(mPlanets.get(position).desc);
return view;
}
}
java
public class BaseAdapterActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
private Spinner sp_base;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_base_adapter);
sp_base = findViewById(R.id.sp_base);
CustomBaseAdapter adapter = new CustomBaseAdapter(this, Planet.getPlanets());
sp_base.setAdapter(adapter);
sp_base.setSelection(0);
sp_base.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
ToastUtil.show(this, "选中了" + parent.getItemAtPosition(position));
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
当列表的Item从上方滚出屏幕视角之外：
复用convertView
java
public class CustomBaseAdapter extends BaseAdapter {
private Context mContext;
private List<Planet> mPlanets;
public CustomBaseAdapter(Context context, List<Planet> planets) {
mContext = context;
mPlanets = planets;
}
@Override
public int getCount() {
return mPlanets.size();
}
@Override
public Object getItem(int position) {
return mPlanets.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView == null){
convertView= LayoutInflater.from(mContext).inflate(R.layout.item_list, null);
viewHolder = new ViewHolder();
viewHolder.iv_icon = convertView.findViewById(R.id.iv_icon);
viewHolder.tv_name = convertView.findViewById(R.id.tv_name);
viewHolder.tv_desc = convertView.findViewById(R.id.tv_desc);
// 将视图持有者保存到转换视图中
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) convertView.getTag();
}
// 给控件设置好数据
viewHolder.iv_icon.setImageResource(mPlanets.get(position).image);
viewHolder.tv_name.setText(mPlanets.get(position).name);
viewHolder.tv_desc.setText(mPlanets.get(position).desc);
return convertView;
}
public final class ViewHolder{
public ImageView iv_icon;
public TextView tv_name;
public TextView tv_desc;
}
}2.列表视图ListView
ListView允许在页面上分行展示数据列表，例如新闻列表、商品列表等，方便用户浏览与操作。
xml
<ListView
android:id="@+id/lv_planet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:divider="@null"
android:dividerHeight="0dp"
android:listSelector="@color/transparent"/>
java
public class ListViewActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, CompoundButton.OnCheckedChangeListener {
private ListView lv_planet;
private List<Planet> planetList;
private CheckBox ck_divider;
private CheckBox ck_selector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
lv_planet = findViewById(R.id.lv_planet);
ck_divider = findViewById(R.id.ck_divider);
ck_selector = findViewById(R.id.ck_selector);
ck_divider.setOnCheckedChangeListener(this);
ck_selector.setOnCheckedChangeListener(this);
planetList = Planet.getPlanets();
CustomBaseAdapter adapter = new CustomBaseAdapter(this, planetList);
lv_planet.setAdapter(adapter);
lv_planet.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ToastUtil.show(this, "点击了：" + planetList.get(position).name);
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
switch (buttonView.getId()){
case R.id.ck_divider:
if(ck_divider.isChecked()){
// 从资源文件获取图形对象
Drawable drawable = getResources().getDrawable(R.color.black,getTheme());
lv_planet.setDivider(drawable);
lv_planet.setDividerHeight(Utils.dip2px(this,1));
}else{
// 隐藏分割线
lv_planet.setDivider(null);
lv_planet.setDividerHeight(0);
}
break;
case R.id.ck_selector:
// 显示按压背景
if (ck_selector.isChecked()){
lv_planet.setSelector(R.drawable.list_selector);
}else{
Drawable drawable = getResources().getDrawable(R.color.transparent, getTheme());
lv_planet.setSelector(drawable);
}
break;
}
}
}ListView会出现条目事件冲突，比如每个条目具有点击事件，每个条目中的按钮同样具有点击事件，那么这样我们点击条目是不会出现任何响应。
xml
<?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="wrap_content"
android:descendantFocusability="blocksDescendants">
<!-- blocksDescendants 可阻止下级控件获取焦点，避免阻塞列表视图的点击事件-->
<ImageView
android:id="@+id/iv_icon"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="80dp"
android:scaleType="fitCenter" />
<LinearLayout
android:layout_width="0dp"
android:layout_weight="3"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_marginLeft="5dp">
<TextView
android:id="@+id/tv_name"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="start|center"
android:textColor="@color/black"
android:textSize="20sp"/>
<TextView
android:id="@+id/tv_desc"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:gravity="start|center"
android:textColor="@color/black"
android:layout_marginTop="5dp"
android:textSize="13sp"/>
</LinearLayout>
<Button
android:id="@+id/btn_oper"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="点我"
android:gravity="center"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
/>
</LinearLayout>3.网格视图GridView
网格视图用于分行分列显示表格信息。
| XML中的属性 | GridView类的设置方法 | 说明 |
|---|---|---|
| horizontalSpacing | setHorizontalSpacing | 指定网格项在水平方向的间距 |
| verticalSpacing | setVerticalSpacing | 指定网格项在垂直方向的间距 |
| numColumns | setNumColumns | 指定列的数目 |
| stretchMode | setStretchMode | 指定剩余控件的拉伸模式 |
| columnWidth | setColumnWidth | 指定每列的宽度 |
| XML中的拉伸模式 | GridView类的拉伸模式 | 说明 |
|---|---|---|
| none | NO_STRETCH | 不拉伸 |
| columnWidth | STRETCH_COLUMN_WIDTH | 若有剩余空间，则拉伸列宽挤掉空隙 |
| spacingWidth | STRETCH_SPACING | 若有剩余空间，则列宽不变，把空间分配到每列间的空隙 |
| spacingWidthUniform | STRETCH_SPACING_UNIFORM | 若有剩余空间，则列宽不变，把空间分配到每列左右的空隙 |
4.翻页视图ViewPager
ViewPager翻页时图允许页面在水平方向左右滑动。
java
public class ViewPagerActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
private ViewPager vp_content;
private List<GoodsInfo> goodsInfoList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_pager);
vp_content = findViewById(R.id.vp_content);
goodsInfoList = GoodsInfo.getDefaultList();
ImagePagerAdapter adapter = new ImagePagerAdapter(this, goodsInfoList);
vp_content.setAdapter(adapter);
vp_content.addOnPageChangeListener(this);
}
/**
* 当页面正在滑动时调用，参数包括当前项位置、偏移量及偏移像素值。
* position:当前页面，及你点击滑动的页面。
* positionOffset:当前页面偏移的百分比，百分比范围：0~1。
* positionOffsetPixels:当前页面偏移的像素位置。
*/
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
/**
* 当新的页面被选中时调用，参数为新选中页面的位置。
*/
@Override
public void onPageSelected(int position) {
ToastUtil.show(this, "当前页面位置：" + position);
}
/**
* 页面滚动状态改变时调用，参数表示新的状态。
* state:0表示当前页面被完全显示出来；1表示正在滑动，2表示滑动结束，但是没有被完全显示出来。
*/
@Override
public void onPageScrollStateChanged(int state) {
}
}
java
public class ImagePagerAdapter extends PagerAdapter {
private Context mContext;
private List<GoodsInfo> mList;
private List<ImageView> mViewList = new ArrayList<>();
public ImagePagerAdapter(Context mContext, List<GoodsInfo> mList) {
this.mContext = mContext;
this.mList = mList;
// 每个商品分配一个专用的图像视图
this.mViewList = mList.stream().map(item -> {
ImageView imageView = new ImageView(mContext);
imageView.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
imageView.setImageResource(item.pic);
return imageView;
}).collect(Collectors.toList());
}
@Override
public int getCount() {
return mViewList.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return view == object;
}
// 实例化到指定位置的页面，并将其添加到容器中
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
// 添加一个view到container中，而后返回一个跟这个view可以关联起来的对象
ImageView item = mViewList.get(position);
container.addView(item);
return item;
}
// 从容器中销毁指定位置的页面
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
container.removeView(mViewList.get(position));
}
}5.翻页标签栏pagerTabStrip
java
public class PagerTabActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
private List<GoodsInfo> mGoodsInfoList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
EdgeToEdge.enable(this);
setContentView(R.layout.activity_pager_tab);
initPagerStrip();
initViewPager();
}
// 初始化翻页视图
private void initViewPager() {
ViewPager vp_content = findViewById(R.id.vp_content);
mGoodsInfoList = GoodsInfo.getDefaultList();
vp_content.setAdapter(new ImagePagerAdapter(this, mGoodsInfoList));
vp_content.addOnPageChangeListener(this);
vp_content.setCurrentItem(3);
}
// 初始化翻页标签栏
private void initPagerStrip() {
PagerTabStrip pts_tab = findViewById(R.id.pts_tab);
// 设置标签栏文本大小
pts_tab.setTextSize(TypedValue.COMPLEX_UNIT_SP,20);
pts_tab.setTextColor(Color.BLACK);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
ToastUtil.show(this,"您翻到的手机品牌是" + mGoodsInfoList.get(position).name );
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
java
public class ImagePagerAdapter extends PagerAdapter {
private Context mContext;
private List<GoodsInfo> mList;
private List<ImageView> mViewList = new ArrayList<>();
public ImagePagerAdapter(Context mContext, List<GoodsInfo> mList) {
this.mContext = mContext;
this.mList = mList;
// 每个商品分配一个专用的图像视图
this.mViewList = mList.stream().map(item -> {
ImageView imageView = new ImageView(mContext);
imageView.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
imageView.setImageResource(item.pic);
return imageView;
}).collect(Collectors.toList());
}
@Override
public int getCount() {
return mViewList.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return view == object;
}
// 实例化到指定位置的页面，并将其添加到容器中
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
// 添加一个view到container中，而后返回一个跟这个view可以关联起来的对象
ImageView item = mViewList.get(position);
container.addView(item);
return item;
}
// 从容器中销毁指定位置的页面
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
container.removeView(mViewList.get(position));
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return mList.get(position).name;
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".PagerTabActivity">
<androidx.viewpager.widget.ViewPager
android:id="@+id/vp_content"
android:layout_marginTop="50dp"
android:layout_width="match_parent"
android:layout_height="400dp">
<androidx.viewpager.widget.PagerTabStrip
android:id="@+id/pts_tab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</androidx.viewpager.widget.ViewPager>
</LinearLayout>
6.ViewPager实现引导页
当用户安装一个新的应用时，首次启动大多出现欢迎页面，这个引导页要往右翻翻好几页，才会进入应用主页，这种启动引导页就是通过翻页视图实现的。
java
public class LaunchSimpleAdapter extends PagerAdapter {
private List<View> mViewList = new ArrayList<>();
/**
* 构造函数，用于初始化适配器并填充页面数据。
*
* @param context 上下文对象
* @param imageArray 图片资源数组
*/
public LaunchSimpleAdapter(Context context, int[] imageArray) {
for (int i = 0; i < imageArray.length; i++) {
// 从布局文件中加载页面视图
View view = LayoutInflater.from(context).inflate(R.layout.item_launch, null);
// 获取 ImageView 并设置图片资源
ImageView iv_launch = view.findViewById(R.id.iv_launch);
iv_launch.setImageResource(imageArray[i]);
// 获取 RadioGroup
RadioGroup rg_indicate = view.findViewById(R.id.rg_indicate);
// 获取 Button
Button btn_start = view.findViewById(R.id.btn_start);
// 为每个页面添加一组 RadioButton
for (int j = 0; j < imageArray.length; j++) {
RadioButton radioButton = new RadioButton(context);
radioButton.setLayoutParams(new RadioGroup.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT
));
radioButton.setPadding(10, 10, 10, 10);
rg_indicate.addView(radioButton);
}
// 设置当前页面对应的 RadioButton 为选中状态
((RadioButton) rg_indicate.getChildAt(i)).setChecked(true);
// 如果是最后一个页面，则显示按钮并设置点击事件
if (i == imageArray.length - 1) {
btn_start.setVisibility(View.VISIBLE);
btn_start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ToastUtil.show(context, "点击了开始体验");
}
});
} else {
// 如果不是最后一个页面，则隐藏按钮
btn_start.setVisibility(View.GONE);
}
// 将整个页面视图添加到 mViewList 中
mViewList.add(view);
}
}
@Override
public int getCount() {
// 返回页面数量
return mViewList.size();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
// 判断给定的视图是否来自指定的对象
return view == object;
}
@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
// 创建并返回指定位置的页面视图
View view = mViewList.get(position);
container.addView(view);
return view;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
// 移除指定位置的页面视图
container.removeView(mViewList.get(position));
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/iv_launch"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitXY"/>
<RadioGroup
android:id="@+id/rg_indicate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:paddingBottom="20dp"
android:orientation="horizontal"/>
<Button
android:id="@+id/btn_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="立即开始美好生活"
android:textColor="@color/black"
android:textSize="22sp"
android:visibility="gone"/>
</RelativeLayout>7.碎片Fragment
传统的Activity并不能很好的处理大屏问题，所以急需一个碎片化的东西能够划区域展示内容，且有自己的独立可操作空间，所以就出现了Fragment。
静态注册在布局文件中直接指定Fragment，而动态注册直到代码中才动态添加Fragment。
1.Fragment静态注册
java
public class FragmentStaticActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment_static);
}
}
java
public class StaticFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_static, container, false);
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".FragmentStaticActivity">
<fragment
android:id="@+id/fragment_static"
android:name="com.zzzjian.demo6.fragment.StaticFragment"
android:layout_width="match_parent"
android:layout_height="60dp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="每个页面具体的内容"
android:textColor="@color/black"
android:gravity="center"
android:textSize="17sp"/>
</LinearLayout>
xml
<?xml version="1.0" encoding="utf-8"?>
<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="wrap_content"
android:orientation="horizontal"
android:background="#bbffbb"
tools:context=".fragment.StaticFragment">
<TextView
android:id="@+id/tv_adv"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
android:text="广告图片"
android:textColor="@color/black"
android:gravity="center"
android:textSize="17sp"/>
<ImageView
android:id="@+id/iv_adv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="4"
android:src="@drawable/ikun"
android:scaleType="fitCenter"/>
</LinearLayout>
2.Fragment生命周期
java
public class StaticFragment extends Fragment {
private static final String TAG = "StaticFragment";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_static, container, false);
}
@Override
public void onAttach(@NonNull Context context) {
super.onAttach(context);
Log.d(TAG, "onAttach ");
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate ");
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Log.d(TAG, "onViewCreated ");
}
@Override
public void onStart() {
super.onStart();
Log.d(TAG, "onStart ");
}
@Override
public void onResume() {
super.onResume();
Log.d(TAG, "onResume ");
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.d(TAG, "onActivityCreated ");
}
@Override
public void onPause() {
super.onPause();
Log.d(TAG, "onPause ");
}
@Override
public void onStop() {
super.onStop();
Log.d(TAG, "onStop ");
}
@Override
public void onDestroyView() {
super.onDestroyView();
Log.d(TAG, "onDestroyView ");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy ");
}
@Override
public void onDetach() {
super.onDetach();
Log.d(TAG, "onDetach ");
}
}3.Fragment动态注册
java
ublic class FragmentDynamicActivity extends AppCompatActivity {
private ViewPager vp_content;
private PagerTabStrip pts_tab;
private List<GoodsInfo> mGoodsList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment_dynamic);
initPagerStrip();
initViewPager();
}
private void initViewPager() {
vp_content = findViewById(R.id.vp_content);
mGoodsList = GoodsInfo.getDefaultList();
MobilePagerAdapter adapter = new MobilePagerAdapter(getSupportFragmentManager(), mGoodsList);
vp_content.setAdapter(adapter);
vp_content.setCurrentItem(0);
}
private void initPagerStrip() {
pts_tab = findViewById(R.id.pts_tab);
pts_tab.setTextSize(TypedValue.COMPLEX_UNIT_SP,20);
pts_tab.setTextColor(Color.BLACK);
}
}
java
public class DynamicFragment extends Fragment {
public static DynamicFragment newInstance(int position,int image_id,String desc) {
DynamicFragment fragment = new DynamicFragment();
// 把参数打包传入fragment中
Bundle args = new Bundle();
args.putInt("position",position);
args.putInt("image_id", image_id);
args.putString("desc", desc);
fragment.setArguments(args);
return fragment;
}
/**
* 创建碎片视图
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_dynamic, container, false);
ImageView iv_pic = (ImageView) view.findViewById(R.id.iv_pic);
TextView tv_desc = (TextView) view.findViewById(R.id.tv_desc);
if(getArguments() != null){
iv_pic.setImageResource(getArguments().getInt("image_id"));
tv_desc.setText(getArguments().getString("desc"));
}
return view;
}
}
java
public class MobilePagerAdapter extends FragmentPagerAdapter {
private List<GoodsInfo> mGoodsList;
public MobilePagerAdapter(@NonNull FragmentManager fm, List<GoodsInfo> goodsInfoList) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
this.mGoodsList = goodsInfoList;
}
@NonNull
@Override
public Fragment getItem(int position) {
GoodsInfo info = mGoodsList.get(position);
return DynamicFragment.newInstance(position, info.pic ,info.description);
}
@Override
public int getCount() {
return mGoodsList.size();
}
@Nullable
@Override
public CharSequence getPageTitle(int position) {
return mGoodsList.get(position).name;
}
}