标签：totalist hide Fragment private public 简单 new 起始页 id
起始页+Fragment 简单综合项目
起始页+Fragment +List View
1.首选确认需求 再进行书写
(1) 起始页 +页面跳转到主页面
// 首选前端页面控件 获取到 后台
private ViewPager vpPaget2;
private TextView tvText;
// 适配器 Fragment的集合 在里面存入 想要在 起始页显示的 Fragment
private ArrayList<Fragment> totalist=new ArrayList<>();
// MyAdapter2 自定义适配器
private MyAdapter2 myAdapter2;
private FragmentTransaction transaction;
private FragmentManager manager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_welcom);
vpPaget2 = findViewById(R.id.vp_paget2);
tvText = findViewById(R.id.tv_text);
totalist.add(new MyFragmentChildOne());
totalist.add(new MyFragmentChildTwo());
totalist.add(new MyFragmentChildThree());
myAdapter2=new MyAdapter2(getSupportFragmentManager(),totalist);
vpPaget2.setAdapter(myAdapter2);
vpPaget2.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
if (position==totalist.size()-1){
// 使用CountDownTimer 进行计时并且
new CountDownTimer(3000,1000) {
@SuppressLint("SetTextI18n")
@Override
public void onTick(long l) {
// 当CountDownTimer 执行一次 进行一次 方法
tvText.setText("倒计时"+l/1000+"秒");
}
@Override
public void onFinish() {
// 当三次读秒结束 进行页面跳转
Intent intent = new Intent(WelcomActivity.this, MainActivity.class);
startActivity(intent);
// 最后 finish 关闭当前 页面
finish();
}
}.start();
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
}
MyAdapter2 自定义适配器 适配器书写方法
public class MyAdapter2 extends FragmentPagerAdapter {
//声明集合 通过构造赋值
private ArrayList<Fragment> totalist;
//FragmentManager 调用getSupportFragmentManager() 进行赋值
public MyAdapter2(@NonNull FragmentManager fm, ArrayList<Fragment> totalist) {
super(fm);
this.totalist = totalist;
}
//返回 postion位置的 Fegment
@NonNull
@Override
public Fragment getItem(int position) {
return totalist.get(position);
}
//返回 feagment的总数
@Override
public int getCount() {
return totalist.size();
}
}
主页面的书写
<?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"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/myFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<RadioGroup
android:id="@+id/radio_button"
android:layout_width="match_parent"
android:layout_height="70dp"
android:orientation="horizontal"
android:layout_alignParentBottom="true"
>
<RadioButton
android:id="@+id/index"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:text="首页"
android:gravity="center"
android:checked="true"
android:drawableTop="@mipmap/ye"
android:paddingTop="5dp"
/>
<RadioButton
android:id="@+id/photos"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:text="图库"
android:gravity="center"
android:checked="true"
android:drawableTop="@mipmap/hm"
android:paddingTop="5dp"
/>
<RadioButton
android:id="@+id/finds"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:text="首页"
android:gravity="center"
android:checked="true"
android:drawableTop="@mipmap/search"
android:paddingTop="5dp"
/>
<RadioButton
android:id="@+id/linkman"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:text="消息"
android:gravity="center"
android:drawableTop="@mipmap/wechat"
android:paddingTop="5dp"
/>
<RadioButton
android:id="@+id/discover"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:button="@null"
android:text="我的"
android:gravity="center"
android:drawableTop="@mipmap/post"
android:paddingTop="5dp"
/>
</RadioGroup>
<TextView
android:id="@+id/text_view"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textSize="20sp"
android:textColor="#ffffff"
android:layout_above="@+id/radio_button"
/>
</RelativeLayout>
主页面的 核心代码
// 五个页面的 显示转换
private void initView() {
myFragment = findViewById(R.id.myFragment);
radioButton = findViewById(R.id.radio_button);
index = findViewById(R.id.index);
photos = findViewById(R.id.photos);
finds = findViewById(R.id.finds);
linkman = findViewById(R.id.linkman);
discover = findViewById(R.id.discover);
textView = findViewById(R.id.text_view);
one=new MyFragmentOne();
two=new MyFragmentTwo();
three=new MyFragmentThree();
four=new MyFragmentFour();
find=new MyFragmentFind();
getSupportFragmentManager()
.beginTransaction()
.add(R.id.myFragment,one)
.add(R.id.myFragment,two)
.add(R.id.myFragment,three)
.add(R.id.myFragment,four)
.add(R.id.myFragment,find)
.commit();
radioButton.setOnCheckedChangeListener ( new RadioGroup.OnCheckedChangeListener ( ) {
@Override
public void onCheckedChanged(RadioGroup group , int checkedId) {
switch (checkedId) {
case R.id.index:
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.myFragment,find).commit();
break;
case R.id.finds:
getSupportFragmentManager ()
.beginTransaction ()
.replace(R.id.myFragment,one)
.commit ();
break;
case R.id.linkman:
getSupportFragmentManager ()
.beginTransaction ()
.replace(R.id.myFragment,two)
.commit ();
break;
case R.id.discover:
getSupportFragmentManager ()
.beginTransaction ()
.replace(R.id.myFragment,three)
.commit ();
break;
case R.id.photos:
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.myFragment,four).commit();
break;
}
}
} );
}
}
页面中嵌套 tablayout
public class MyFragmentFind extends Fragment {
private TabLayout tlLayout;
private ViewPager vpPager;
private ArrayList<String> titles=new ArrayList<>();
private ArrayList<Fragment> totalist=new ArrayList<>();
private MyFragmentChildOne one=new MyFragmentChildOne();
private MyFragmentChildTwo two=new MyFragmentChildTwo();
private MyFragmentChildThree three=new MyFragmentChildThree();
private MyFragmentList list=new MyFragmentList();
private MyFragmentParger parger;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_tab,null);
tlLayout =view.findViewById(R.id.tl_layout);
vpPager = view.findViewById(R.id.vp_pager);
initDatas();
return view;
}
private void initDatas() {
titles.add("推荐");
titles.add("男士发型打理");
titles.add("热发型");
titles.add("编发教程");
totalist.add(list);
totalist.add(one);
totalist.add(two);
totalist.add(three);
parger=new MyFragmentParger(getChildFragmentManager(),totalist,titles);
vpPager.setAdapter(parger);
tlLayout.setupWithViewPager(vpPager);
}
}
页面中嵌套 tablayout 页面书写(注意 : 要导入依赖)
依赖:
implementation ‘com.android.support:design:28.0.0’
<?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:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.8"
android:id="@+id/tl_layout"/>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="9"
android:id="@+id/vp_pager"/>
</LinearLayout>
普通 Frgment 页面随意书写 每一个 frgment对应一个类
每个对应类 需要继承 Frgment 并且重写方法
public class MyFragmentOne extends Fragment {
private RadioGroup radioButton02;
private MyFragmentChildOne childOne;
private MyFragmentChildTwo childTwo;
private MyFragmentChildThree childThree;
private MyFragmentChildFour childFour;
private MyFragmentChildFive childFive;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater , @Nullable ViewGroup container , @Nullable Bundle savedInstanceState) {
View view = inflater.inflate ( R.layout.fragment_view01 , null );
childOne = new MyFragmentChildOne ( );
childTwo = new MyFragmentChildTwo ( );
childThree = new MyFragmentChildThree ( );
childFour = new MyFragmentChildFour ( );
childFive = new MyFragmentChildFive ( );
// childOne.setMessage ( childThree );
MainActivity activity = (MainActivity) getActivity ( );
//childThree.setMessage (activity.three );
getChildFragmentManager ( )
.beginTransaction ( )
.add ( R.id.myFragment_02 , childTwo )
.add ( R.id.myFragment_02 , childThree )
.add ( R.id.myFragment_02 , childFour )
.add ( R.id.myFragment_02 , childFive )
.add ( R.id.myFragment_02 , childOne )
.hide ( childTwo )
.hide ( childThree )
.hide ( childFour )
.hide ( childFive )
.show ( childOne )
.commit ( );
radioButton02 = (RadioGroup) view.findViewById ( R.id.radio_button_02 );
return view;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated ( savedInstanceState );
// final MainActivity activity = (MainActivity) getActivity ( );
radioButton02.setOnCheckedChangeListener ( new RadioGroup.OnCheckedChangeListener ( ) {
@Override
public void onCheckedChanged(RadioGroup group , int checkedId) {
switch (checkedId) {
case R.id.button_all:
getChildFragmentManager ( )
.beginTransaction ( )
.hide ( childTwo )
.hide ( childThree )
.hide ( childFour )
.hide ( childFive )
.show ( childOne )
.commit ( );
break;
case R.id.button_video:
getChildFragmentManager ( )
.beginTransaction ( )
.hide ( childOne )
.hide ( childThree )
.hide ( childFour )
.hide ( childFive )
.show ( childTwo )
.commit ( );
break;
case R.id.button_pic:
getChildFragmentManager ( )
.beginTransaction ( )
.hide ( childOne )
.hide ( childTwo )
.hide ( childThree )
.hide ( childFive )
.show ( childFour)
.commit ( );
break;
case R.id.button_voice:
getChildFragmentManager ( )
.beginTransaction ( )
.hide ( childOne )
.hide ( childTwo )
.hide ( childFour )
.hide ( childFive )
.show ( childThree)
.commit ( );
break;
case R.id.button_dz:
getChildFragmentManager ( )
.beginTransaction ( )
.hide ( childOne )
.hide ( childTwo )
.hide ( childThree )
.hide ( childFour )
.show (childFive )
.commit ( );
break;
}
}
} );
}
}
fegment中 如何书写 ListView
public class MyFragmentList extends Fragment {
private ListView iv_list;
// 放入json 数据的 网址
private String urlString="http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&page=1";
private MyAdapter myAdapter;
// json数据解析后的类 创建集合
private List<JavaBean.DataBean> totalist=new ArrayList<>();
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.fragment_list,null);
new JsonAsyntck().execute(urlString);
iv_list=view.findViewById(R.id.iv_list);
myAdapter=new MyAdapter(getActivity().getBaseContext(),totalist);
iv_list.setAdapter(myAdapter);
iv_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(getActivity().getBaseContext(), "短点击事件", Toast.LENGTH_SHORT).show();
}
});
iv_list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(getActivity().getBaseContext(), "长点事件", Toast.LENGTH_SHORT).show();
return false;
}
});
return view;
}
public class JsonAsyntck extends AsyncTask<String,Void,List<JavaBean.DataBean>> {
@Override
protected List<JavaBean.DataBean> doInBackground(String... strings) {
try {
URL url = new URL(strings[0]);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.connect();
if (conn.getResponseCode()==200){
InputStream is = conn.getInputStream();
ByteArrayOutputStream byso = new ByteArrayOutputStream();
int len=0;
byte[] bs = new byte[1024];
while ((len=is.read(bs))!=-1){
byso.write(bs,0,len);
}
String json = byso.toString();
Gson gson = new Gson();
JavaBean javaBean = gson.fromJson(json, JavaBean.class);
List<JavaBean.DataBean> data = javaBean.getData();
return data;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(List<JavaBean.DataBean> dataBeans) {
super.onPostExecute(dataBeans);
if (dataBeans!=null){
totalist.addAll(dataBeans);
myAdapter.notifyDataSetChanged();
}
}
}
}
ListView需要适配器才可以 显示内容 适配器 书写
public class MyAdapter extends BaseAdapter {
private Context context;
private List<JavaBean.DataBean> totalist;
private LayoutInflater layoutInflater;
public MyAdapter(Context context, List<JavaBean.DataBean> totalist) {
this.context = context;
this.totalist = totalist;
this.layoutInflater=LayoutInflater.from(context);
}
@Override
public int getCount() {
return totalist.size();
}
@Override
public Object getItem(int position) {
return totalist.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHoder viewHoder=null;
if (convertView==null){
viewHoder=new ViewHoder();
convertView=layoutInflater.inflate(R.layout.item_list,null);
viewHoder.iv_item=convertView.findViewById(R.id.iv_item);
viewHoder.tv_item=convertView.findViewById(R.id.tv_item);
convertView.setTag(viewHoder);
}else {
viewHoder= (ViewHoder) convertView.getTag();
}
JavaBean.DataBean dataBean = totalist.get(position);
String title = dataBean.getTitle();
String pic = dataBean.getPic();
viewHoder.tv_item.setText(title);
Picasso.with(context).load(pic).into(viewHoder.iv_item);
return convertView;
}
class ViewHoder{
private ImageView iv_item;
private TextView tv_item;
}
}
标签：totalist,hide,Fragment,private,public,简单,new,起始页,id 来源： https://blog.csdn.net/weixin_48633671/article/details/106890827
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