安卓开发
最近几天还算是有一点收获，学会关于ViewPager2,和fragment的联动实现页面的滑动。上代码：
fragment1
package com.example.myapplication3.activity.fragment;
import android.annotation.SuppressLint;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.example.myapplication3.R;
import com.example.myapplication3.activity.activity.MainActivity2;
import com.example.myapplication3.activity.bean.State;
import com.example.myapplication3.activity.dao.Dao;
public class Fragment1 extends Fragment implements View.OnClickListener{
private String name;
private State st;
private Dao dao ;
private Button yes;
private Button no;
private RadioGroup rg_tab_bar;
@SuppressLint("MissingInflatedId")
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_1, container, false);
yes = view.findViewById(R.id.yes);
yes.setOnClickListener(this);
no = view.findViewById(R.id.no);
no.setOnClickListener(this);
st = new State();
dao = new Dao();
return view;
}
@Override
public void onClick(View view) {
switch (view.getId())
{
case R.id.yes:
st.setName(name);
st.setState("是");
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
dao.insertSubmit(st);
}
});thread.start();
Toast toast = Toast.makeText(getContext(),"您已经完成订餐！",Toast.LENGTH_SHORT);
toast.show();
disableAllButton();
break;
case R.id.no:
st.setName(name);
st.setState("否");
Thread thread1 = new Thread(new Runnable() {
@Override
public void run() {
dao.insertSubmit(st);
}
});thread1.start();
disableAllButton();
Toast toast1 = Toast.makeText(getContext(),"您没有订餐，记得按时就餐！",Toast.LENGTH_SHORT);
toast1.show();
break;
}
}
// 更新传过来的数据
public void upData(String data)
{
name = data;
}
private void disableAllButton()
{
yes.setEnabled(false);
no.setEnabled(false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// 设置点击事件监听
view.setOnTouchListener(new View.OnTouchListener() {
@SuppressLint("WrongViewCast")
@Override
public boolean onTouch(View v, MotionEvent event) {
// 获取点击事件的坐标
float x = event.getX();
float y = event.getY();
MainActivity2 mainActivity2 = (MainActivity2) getActivity();
if(mainActivity2 != null)
{
rg_tab_bar = mainActivity2.findViewById(R.id.rg_tab_bar);
}
// 判断点击事件的类型
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:// 当按下时执行的逻辑
rg_tab_bar.setVisibility(View.VISIBLE);
break;
case MotionEvent.ACTION_MOVE:// 当移动时执行的逻辑
rg_tab_bar.setVisibility(View.VISIBLE);
break;
case MotionEvent.ACTION_UP:// 当抬起时执行的逻辑
// 当松开时执行延迟操作
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
// 在这里将 rg_tab_bar 设置为不可见
rg_tab_bar.setVisibility(View.GONE);
}
}, 3000);
break;
}
// 返回 true 表示已经处理了点击事件，否则返回 false
return true;
}
});
}
}
myFragmentPagerAdapter（适配器处理）
package com.example.myapplication3.activity.fragmentpageradapter;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.Lifecycle;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import com.example.myapplication3.activity.activity.MainActivity2;
import com.example.myapplication3.activity.fragment.Fragment1;
import com.example.myapplication3.activity.fragment.Fragment2;
import com.example.myapplication3.activity.fragment.Fragment3;
import com.example.myapplication3.activity.fragment.Fragment4;
public class myFragmentPagerAdapter extends FragmentStateAdapter {
private final int PAGER_COUNT = 4;
private Fragment1 fragment1 = null;
private Fragment2 fragment2 = null;
private Fragment3 fragment3 = null;
private Fragment4 fragment4 = null;
public myFragmentPagerAdapter( FragmentManager fragmentManager, Lifecycle lifecycle) {
super(fragmentManager, lifecycle);
fragment1 = new Fragment1();
fragment2 = new Fragment2();
fragment3 = new Fragment3();
fragment4 = new Fragment4();
}
@Override
public Fragment createFragment(int position) {
Fragment fragment = null;
switch (position) {
case MainActivity2.PAGE_ONE:
fragment = fragment1;
break;
case MainActivity2.PAGE_TWO:
fragment = fragment2;
break;
case MainActivity2.PAGE_THREE:
fragment = fragment3;
break;
case MainActivity2.PAGE_FOUR:
fragment = fragment4;
break;
}
return fragment;
}
@Override
public int getItemCount() {
return PAGER_COUNT;
}
}
MainActivity2（主页面用于安排fragment）
package com.example.myapplication3.activity.activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager2.widget.ViewPager2;
import com.example.myapplication3.R;
import com.example.myapplication3.activity.fragmentpageradapter.myFragmentPagerAdapter;
import com.example.myapplication3.activity.fragment.Fragment1;
public class MainActivity2 extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {
private String name;
private RadioButton a;
private RadioButton b;
private RadioButton c;
private RadioButton d;
private RadioGroup rg_tab_bar;
private ViewPager2 viewpage;
private myFragmentPagerAdapter myFragmentPagerAdapter;
public static final int PAGE_ONE = 0;
public static final int PAGE_TWO = 1;
public static final int PAGE_THREE = 2;
public static final int PAGE_FOUR = 3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
bindView();
a.setChecked(true);
// rg_tab_bar.setVisibility(View.GONE);
}
private void bindView()
{
Bundle bundle = getIntent().getExtras();
if(bundle != null)
{
name = bundle.getString("username");
}
a = (RadioButton) findViewById(R.id.a);
b = (RadioButton) findViewById(R.id.b);
c = (RadioButton) findViewById(R.id.b);
d = (RadioButton) findViewById(R.id.d);
rg_tab_bar = (RadioGroup) findViewById(R.id.rg_tab_bar);
viewpage = (ViewPager2) findViewById(R.id.viewpager);
rg_tab_bar.setOnCheckedChangeListener(this);
myFragmentPagerAdapter = new myFragmentPagerAdapter(getSupportFragmentManager(),getLifecycle());
viewpage.setAdapter(myFragmentPagerAdapter);
viewpage.setCurrentItem(0);
viewpage.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
@Override
public void onPageSelected(int position) {
super.onPageSelected(position);
switch (position) {
case PAGE_ONE:
if (myFragmentPagerAdapter.createFragment(PAGE_ONE) != null)
{
Fragment1 fragment1 = (Fragment1) myFragmentPagerAdapter.createFragment(PAGE_ONE);
fragment1.upData(name);
}
rg_tab_bar.check(R.id.a);
// rg_tab_bar.setVisibility(View.GONE);
break;
activity_main2.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:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.activity.MainActivity2">
<RelativeLayout
android:id="@+id/ly_top_bar"
android:layout_width="match_parent"
android:layout_height="48dp">
<TextView
android:id="@+id/txt_topbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:gravity="center"
android:text="信息"
android:textSize="18sp" />
<View
android:layout_width="match_parent"
android:layout_height="2px"
android:layout_alignParentBottom="true"/>
</RelativeLayout>
<RadioGroup
android:id="@+id/rg_tab_bar"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentBottom="true"
android:background="@color/white"
android:orientation="horizontal">
<RadioButton
android:id="@+id/a"
style="@style/tab_menu_item"
android:text="每日营养餐"/>
<RadioButton
android:id="@+id/b"
style="@style/tab_menu_item"
android:text="拍照上传"/>
<RadioButton
android:id="@+id/c"
style="@style/tab_menu_item"
android:text="聊天"/>
<RadioButton
android:id="@+id/d"
style="@style/tab_menu_item"
android:text="我的主页"/>
</RadioGroup>
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@id/rg_tab_bar"
android:layout_below="@id/ly_top_bar"/>
</RelativeLayout>
themes.xml
<resources xmlns:tools="http://schemas.android.com/tools">
<!-- Base application theme. -->
<style name="Base.Theme.MyApplication3" parent="Theme.Material3.DayNight.NoActionBar">
<!-- Customize your light theme here. -->
<!-- <item name="colorPrimary">@color/my_light_primary</item> -->
</style>
<style name="Theme.MyApplication3" parent="Base.Theme.MyApplication3" />
<style name="tab_menu_item">
<item name="android:layout_width">0dp</item>
<item name="android:layout_weight">1</item>
<item name="android:layout_height">match_parent</item>
<item name="android:button">@null</item>
<item name="android:gravity">center</item>
<item name="android:drawableTop">@drawable/tab_menu_all</item>
<item name="android:paddingTop">3dp</item>
<item name="android:textSize">18sp</item>
</style>
</resources>
tab_menu_all.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@mipmap/tab_all_pressed" android:state_checked="true"/>
<item android:drawable="@mipmap/tab_all_normal"/>
</selector>
tab_all_normal
tab_all_pressed
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