请帮我优化以下代码： 主布局文件：<?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:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tool="http://schemas
.android
.com/tools"
android:orientation="vertical"
tools:context="
.Fragment
.Fragment_main">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx
.viewpager
.widget
.ViewPager
android:id="@+id/my
viewpage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="@+id/
view"
android:background="#f0f0f0"/>
<
View
android:id="@+id/
view"
android:layout_width="wrap_content"
android:layout_height="1dp"
android:layout_above="@+id/bot_z"
android:background="#f0f0f0"
tool:layout_editor_absoluteX="419dp"
tool:layout_editor_absoluteY="39dp" />
<LinearLayout
android:id="@+id/bot_z"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true">
<Text
View
android:id="@+id/T1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="首页"
android:textSize="20sp"
android:textStyle="bold" />
<Text
View
android:id="@+id/T2"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="订单"
android:textSize="20sp"
android:textStyle="bold" />
<Text
View
android:id="@+id/T3"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:text="我的"
android:textSize="20sp"
android:textStyle="bold" />
</LinearLayout>
</RelativeLayout>
</LinearLayout> 分布局文件：lout1:<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Image
View
android:id="@+id/image
View"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:src="@drawable/mm001"
/>
</LinearLayout> lout2:<?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:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Image
View
android:id="@+id/image
View"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:src="@drawable/mm001"/>
<Text
View
android:id="@+id/text
View"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="zhehsi page2" />
</LinearLayout> lout3:<?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:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Image
View
android:id="@+id/image
View"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:src="@drawable/mm001" />
<Text
View
android:id="@+id/text
View"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="zhehsi page3" />
</LinearLayout> 主main
.java:package com
.example
.myapplication
.Fragment;
import android
.graphics
.Color;
import android
.os
.Bundle;
import android
.view.View;
import android
.widget
.Text
View;
import androidx
.appcompat
.app
.AppCompatActivity;
import androidx
.fragment
.app
.Fragment;
import androidx
.fragment
.app
.FragmentTransaction;
import androidx
.viewpager
.widget
.ViewPager;
import com
.example
.myapplication
.R;
import com
.example
.myapplication
.Viewpagerhd
.Mypageradapter;
import java
.util
.ArrayList;
import java
.util
.List;
public class Fragment_main extends AppCompatActivity implements
View.OnClickListener {
private Fragment fragment1, fragment2, fragment3;
private Text
View tab1, tab2, tab3;
private
ViewPager my
Viewpager;
private List<Fragment> fragmentList;
private Mypageradapter mypageradapter;
private Fragment currentFragment;
@Override
protected void onCreate
(Bundle savedInstanceState
) {
super
.onCreate
(savedInstanceState
);
setContent
View(R
.layout
.activity_fragment1
);
initUI
();
// initFragments
();
initTab
();
}
private void initTab
() {
Fragmenta_1 fragmenta_1 = new Fragmenta_1
();
Fragmenta_2 fragmenta_2 = new Fragmenta_2
();
Fragmenta_3 fragmenta_3 = new Fragmenta_3
();
fragmentList = new ArrayList<Fragment>
();
fragmentList
.add
(fragmenta_1
);
fragmentList
.add
(fragmenta_2
);
fragmentList
.add
(fragmenta_3
);
mypageradapter = new Mypageradapter
(getSupportFragmentManager
(),fragmentList
);
my
Viewpager
.setAdapter
(mypageradapter
);
my
Viewpager
.addOnAdapterChangeListener
(new MyPageChangeListennr
());
showFragment
(0
);
}
private void showFragment
(int i
) {
my
Viewpager
.setCurrentItem
(i
);
if
(i == 0
){
tab1
.setBackgroundColor(Color
.RED
);
tab2
.setBackgroundColor(Color
.WHITE
);
tab3
.setBackgroundColor(Color
.WHITE
);
}else if
(i==1
){
tab2
.setBackgroundColor(Color
.RED
);
tab1
.setBackgroundColor(Color
.WHITE
);
tab3
.setBackgroundColor(Color
.WHITE
);
}else if
(i==2
){
tab3
.setBackgroundColor(Color
.RED
);
tab2
.setBackgroundColor(Color
.WHITE
);
tab1
.setBackgroundColor(Color
.WHITE
);
}
}
public class MyPageChangeListennr implements
ViewPager
.OnPageChangeListener {
@Override
public void onPageScrolled
(int position, float positionOffset, int positionOffsetPixels
) {
}
@Override
public void onPageSelected
(int position
) {
if
(position==0
){
tab1
.setBackgroundColor(Color
.RED
);
tab2
.setBackgroundColor(Color
.WHITE
);
tab3
.setBackgroundColor(Color
.WHITE
);
}else if
(position==1
){
tab2
.setBackgroundColor(Color
.RED
);
tab1
.setBackgroundColor(Color
.WHITE
);
tab3
.setBackgroundColor(Color
.WHITE
);
}else if
(position==2
){
tab3
.setBackgroundColor(Color
.RED
);
tab2
.setBackgroundColor(Color
.WHITE
);
tab1
.setBackgroundColor(Color
.WHITE
);
}
}
@Override
public void onPageScrollStateChanged
(int state
) {
}
}
private void initUI
() {
tab1 = find
ViewById
(R
.id
.T1
);
tab2 = find
ViewById
(R
.id
.T2
);
tab3 = find
ViewById
(R
.id
.T3
);
tab1
.setOnClickListener
(this
);
tab2
.setOnClickListener
(this
);
tab3
.setOnClickListener
(this
);
my
Viewpager =
(ViewPager
) find
ViewById
(R
.id
.my
viewpage
);
// updateTabColors
(R
.id
.T1
);
}
// private void initFragments
() {
// FragmentTransaction transaction = getSupportFragmentManager
().beginTransaction
();
//
// // 按顺序添加所有Fragment
// fragment1 = new Fragmenta_1
();
// fragment2 = new Fragmenta_2
();
// fragment3 = new Fragmenta_3
();
//
// transaction
.add
(R
.id
.view_pager, fragment1, "1"
);
// transaction
.add
(R
.id
.view_pager, fragment2, "2"
);
// transaction
.add
(R
.id
.view_pager, fragment3, "3"
);
//
// transaction
.hide
(fragment2
);
// transaction
.hide
(fragment3
);
// transaction
.commitNow
(); // 立即提交事务
//
// currentFragment = fragment1;
// }
@Override
public void onClick
(View v
) {
if
(v
.getId
()==R
.id
.T1
) {
showFragment
(0
);
}else if
(v
.getId
()==R
.id
.T2
){
showFragment
(1
);
}else if
(v
.getId
()==R
.id
.T3
){
showFragment
(2
);
}
}
private void switchFragment
(Fragment targetFragment, int tabId
) {
if
(targetFragment == currentFragment
) return;
FragmentTransaction transaction = getSupportFragmentManager
().beginTransaction
();
transaction
.setCustomAnimations
(android
.R
.anim
.fade_in, android
.R
.anim
.fade_out
);
transaction
.hide
(currentFragment
);
transaction
.show
(targetFragment
);
transaction
.commitNow
(); // 使用立即提交
currentFragment = targetFragment;
updateTabColors
(tabId
);
}
private void updateTabColors
(int selectedTabId
) {
int defaultColor = Color
.WHITE;
int selectedColor = Color
.RED;
tab1
.setBackgroundColor(selectedTabId == R
.id
.T1 ? selectedColor : defaultColor
);
tab2
.setBackgroundColor(selectedTabId == R
.id
.T2 ? selectedColor : defaultColor
);
tab3
.setBackgroundColor(selectedTabId == R
.id
.T3 ? selectedColor : defaultColor
);
}
} 适配器java: package com
.example
.myapplication
.Fragment;
import androidx
.fragment
.app
.Fragment;
import androidx
.fragment
.app
.FragmentManager;
import androidx
.fragment
.app
.FragmentPagerAdapter;
import java
.util
.List;
public class MypageAdaper extends FragmentPagerAdapter {
private List<Fragment> fragmentList;
public MypageAdaper
(FragmentManager fm
) {
super
(fm
);
}
public MypageAdaper
(FragmentManager fm,List<Fragment>fragmentList
) {
super
(fm
);
this
.fragmentList=fragmentList;
}
@Override
public Fragment getItem
(int position
) {
return fragmentList
.get
(position
);
}
@Override
public int getCount
() {
return fragmentList
.size
();
}
} Fragmenta_1
. java:package com
.example
.myapplication
.Fragment;
import android
.os
.Bundle;
import android
.view.LayoutInflater;
import android
.view.View;
import android
.view.ViewGroup;
import androidx
.fragment
.app
.Fragment;
import com
.example
.myapplication
.R;
public class Fragmenta_1 extends Fragment {
@Override
public
View onCreate
View(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState
){
View view = inflater
.inflate
(R
.layout
.lout1,container,false
);
return
view;
}
}
Fragmenta_2
.java:package com
.example
.myapplication
.Fragment;
import android
.os
.Bundle;
import android
.view.LayoutInflater;
import android
.view.View;
import android
.view.ViewGroup;
import androidx
.fragment
.app
.Fragment;
import com
.example
.myapplication
.R;
public class Fragmenta_2 extends Fragment {
@Override
public
View onCreate
View(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState
){
View view = inflater
.inflate
(R
.layout
.lout2,container,false
);
return
view;
}
}
Fragmenta_3
.java:package com
.example
.myapplication
.Fragment;
import android
.os
.Bundle;
import android
.view.LayoutInflater;
import android
.view.View;
import android
.view.ViewGroup;
import androidx
.fragment
.app
.Fragment;
import com
.example
.myapplication
.R;
public class Fragmenta_3 extends Fragment {
@Override
public
View onCreate
View(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState
){
View view = inflater
.inflate
(R
.layout
.lout3,container,false
);
return
view;
}
}
报错：错误: 无法将类 Mypageradapter中的构造器 Mypageradapter应用到给定类型;
需要: List<
View>
找到: FragmentManager,List<Fragment>
原因: 实际参数列表
和形式参数列表长度不同
错误: 不兼容的类型: Fragment_main
.MyPageChangeListennr无法转换为OnAdapterChangeListener
本文探讨了在使用View的setBackgroundColor方法时，为何需要输入16进制颜色值而非十进制值的原因。通过深入解释颜色值的表示方式和编程实现细节，帮助开发者理解并正确使用该方法。
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