TabLayout和ViewPager
这里就说下tablayout+viewpager的实现方式；tablayout是android5.0推出来的一个MaterialDesign风格的控件，是专门用来实现tab栏效果的；功能强大，使用方便灵活；
一、引入依赖库
使用非常方便,Android Studio只需要在gradle中引入即可使用 .
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.panzq.tablayout"
minSdkVersion 22
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:recyclerview-v7:28.0.0'
implementation 'com.android.support:support-v4:28.0.0'
}
二、layout中定义TabLayout控件及ViewPager控件
<!--
app:tabGravity="center" 对齐方式，可选fill和center
app:tabIndicatorColor="@color/colorAccent" 设置tab下划线的颜色
app:tabMode="scrollable" scrollable是可以横行滚动,fixed是指固定个数
app:tabSelectedTextColor="@color/colorPrimaryDark" 选择tab的文本颜色
app:tabTextColor="@color/colorPrimary" 普通tab字体颜色
app:tabIndicatorHeight 指示器高度
app:tabBackground tab背景颜色
app:tabMaxWidth tab栏最大宽度
app:tabTextAppearance tab栏字体样式
app:tabMinWidth tab栏最小宽度
-->
<?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/linear"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity"> <android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"> <android.support.design.widget.TabLayout
android:id="@+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="@color/colorPrimary"
app:tabGravity="fill"
app:tabMode="scrollable"
app:tabSelectedTextColor="@color/colorAccent"
app:tabIndicatorColor="@color/colorPrimaryLight"
app:tabTextColor="#ffffff"> <android.support.design.widget.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_call_black_24dp"
android:text="@string/recents" /> <android.support.design.widget.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_star_border_black_24dp"
android:text="@string/favourite" /> <android.support.design.widget.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_person_black_24dp"
android:text="@string/contacts" /> <android.support.design.widget.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_dialpad_black_24dp"
android:text="@string/keypad" /> <android.support.design.widget.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:icon="@drawable/ic_voicemail_black_24dp"
android:text="@string/voicemail" />
</android.support.design.widget.TabLayout> </android.support.v4.view.ViewPager> </LinearLayout>
三 设置TabLayout和ViewPager关联
MainActivity
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TabLayout tabLayout = findViewById(R.id.tabLayout);
ViewPager viewPager = findViewById(R.id.viewPager);
CallPagerAdapter callPagerAdapter = new CallPagerAdapter(getSupportFragmentManager());
callPagerAdapter.addFragment(new RecentCallFragment(), "RECENT");
callPagerAdapter.addFragment(new FavouriteCallFragment(), "FAVOURITE");
callPagerAdapter.addFragment(new ContactCallFragment(), "CONTACTS");
callPagerAdapter.addFragment(new KeypadCallFragment(), "KEYPAD");
callPagerAdapter.addFragment(new VoicemailCallFragment(), "VOICEMAIL");
viewPager.setAdapter(callPagerAdapter);
tabLayout.setupWithViewPager(viewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.ic_call_black_24dp);
tabLayout.getTabAt(1).setIcon(R.drawable.ic_star_border_black_24dp);
tabLayout.getTabAt(2).setIcon(R.drawable.ic_person_black_24dp);
tabLayout.getTabAt(3).setIcon(R.drawable.ic_dialpad_black_24dp);
tabLayout.getTabAt(4).setIcon(R.drawable.ic_voicemail_black_24dp);
}
}
需要注意的是setupWithViewPager();方法的调用必须在viewpager设置完适配器后调用，如果在设置适配器之前调用会抛异常，至于为什么会抛异常，后面tablayout的源码会说到；这样tab栏切换效果就实现了。
如果发现程序出现如下错误
- ::47.677 -/com.example.panzq.tablayout E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.panzq.tablayout, PID:
android.view.InflateException: Binary XML file line #: Binary XML file line #: Error inflating class android.support.design.button.MaterialButton
Caused by: android.view.InflateException: Binary XML file line #: Error inflating class android.support.design.button.MaterialButton
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:)
at android.view.LayoutInflater.createView(LayoutInflater.java:)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:)
at android.view.LayoutInflater.inflate(LayoutInflater.java:)
at android.view.LayoutInflater.inflate(LayoutInflater.java:)
at com.example.panzq.tablayout.fragments.KeypadCallFragment.onCreateView(KeypadCallFragment.java:)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:)
at android.support.v4.view.ViewPager.populate(ViewPager.java:)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:)
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:)
at android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:)
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:)
at android.view.View$PerformClick.run(View.java:)
at android.os.Handler.handleCallback(Handler.java:)
at android.os.Handler.dispatchMessage(Handler.java:)
at android.os.Looper.loop(Looper.java:)
at android.app.ActivityThread.main(ActivityThread.java:)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:)
Caused by: java.lang.IllegalArgumentException: This component requires that you specify a valid TextAppearance attribute. Update your app theme to inherit from Theme.MaterialComponents (or a descendant).
at android.support.design.internal.ThemeEnforcement.checkTextAppearance(ThemeEnforcement.java:)
at android.support.design.internal.ThemeEnforcement.obtainStyledAttributes(ThemeEnforcement.java:)
at android.support.design.button.MaterialButton.<init>(MaterialButton.java:)
at android.support.design.button.MaterialButton.<init>(MaterialButton.java:)
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:)
at android.view.LayoutInflater.createView(LayoutInflater.java:)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:)
at android.view.LayoutInflater.inflate(LayoutInflater.java:)
at android.view.LayoutInflater.inflate(LayoutInflater.java:)
at com.example.panzq.tablayout.fragments.KeypadCallFragment.onCreateView(KeypadCallFragment.java:)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:)
at android.support.v4.view.ViewPager.populate(ViewPager.java:)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:)
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:)
at android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:)
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:)
at android.view.View$PerformClick.run(View.java:)
at android.os.Handler.handleCallback(Handler.java:)
at android.os.Handler.dispatchMessage(Handler.java:)
at android.os.Looper.loop(Looper.java:)
at android.app.ActivityThread.main(ActivityThread.java:)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:)
则需要修改style.xml文件
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
改为
<style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
代码地址：https://github.com/MichealPan9999/TabLayout-ViewPager
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