第三十五篇-AppBarLayout的使用

古之立大事者，不惟有超世之才，亦必有坚忍不拔之志。这篇文章主要讲述第三十五篇-AppBarLayout的使用相关的知识，希望能为你提供帮助。
效果图：

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添加appbarlayout到xml文件中，然后在toolbar下面添加一个imageview并设置居中放置，我放置的是上面那个安卓的图标。

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根据之前学过的toolbar那一节，结合viewpaper和toolbar设置三个页面，这时，运行程序，可能发现那三个页面并没有显示出来，NetedScollView这是个可滚动的页面，单击它，在右侧勾选fillViewport。在运行程序就可以显示页面了。
page1

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page2

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page3

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附上代码
main.java

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package com.example.aimee.appbarlayouttest; import android.support.annotation.Nullable; import android.support.design.widget.TabLayout; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { TabLayout tabLayout; ViewPager viewPager; List< Fragment> fragments; String[] title={"新闻","财经","娱乐"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tabLayout=findViewById(R.id.tabs); viewPager=findViewById(R.id.viewpaper); fragments=new ArrayList< > (); fragments.add(new MyFragment1()); fragments.add(new MyFragment2()); fragments.add(new MyFragment3()); MyAdpter myAdpter=new MyAdpter(getSupportFragmentManager(),fragments); viewPager.setAdapter(myAdpter); tabLayout.setupWithViewPager(viewPager); }private class MyAdpter extends FragmentPagerAdapter{ private List< Fragment> fragments; public MyAdpter(FragmentManager fm,List< Fragment> fragments) { super(fm); this.fragments=fragments; }@Override public Fragment getItem(int position) { return fragments.get(position); }@Override public int getCount() { return fragments.size(); }@Nullable @Override public CharSequence getPageTitle(int position) { return title[position]; } } }

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MyFragment1.java

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package com.example.aimee.appbarlayouttest; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class MyFragment1 extends Fragment { @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view1=inflater.inflate(R.layout.layout_page1,container,false); return view1; } }

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MyFragment2.java

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package com.example.aimee.appbarlayouttest; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class MyFragment2 extends Fragment { @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view1=inflater.inflate(R.layout.layout_page2,container,false); return view1; } }

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MyFragment3.java

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package com.example.aimee.appbarlayouttest; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class MyFragment3 extends Fragment { @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view1=inflater.inflate(R.layout.layout_page3,container,false); return view1; } }

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main.xml

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< ?xml version="1.0" encoding="utf-8"?> < android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> < android.support.design.widget.AppBarLayout android:id="@+id/appbar" android:layout_height="wrap_content" android:layout_width="match_parent"> < android.support.v7.widget.Toolbar android:gravity="center" android:layout_height="?attr/actionBarSize" android:layout_width="match_parent" app:layout_scrollFlags="scroll|enterAlways"> < ImageView android:src="https://www.songbingjia.com/android/@mipmap/ic_launcher" android:layout_width="match_parent" android:layout_height="wrap_content" /> < /android.support.v7.widget.Toolbar> < android.support.design.widget.TabLayout android:id="@+id/tabs" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_scrollFlags="scroll|enterAlways" app:tabMode="scrollable"> < android.support.design.widget.TabItem android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="Tab1" /> < android.support.design.widget.TabItem android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="Tab2" /> < android.support.design.widget.TabItem android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="Tab3" /> < /android.support.design.widget.TabLayout> < /android.support.design.widget.AppBarLayout> < android.support.v4.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" app:layout_behavior="android.support.design.widget.AppBarLayout$ScrollingViewBehavior"> < android.support.constraint.ConstraintLayout android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> < android.support.v4.view.ViewPager android:id="@+id/viewpaper" android:layout_width="match_parent" android:layout_height="0dp" /> < /android.support.constraint.ConstraintLayout> < /android.support.v4.widget.NestedScrollView> < /android.support.design.widget.CoordinatorLayout>

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layout_page1.xml

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< ?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:gravity="center" android:orientation="vertical"> < TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="TextView" /> < /LinearLayout>

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layout_page2.xml

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< ?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"> < Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Button" /> < Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Button" /> < /LinearLayout>

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layout_page3.xml

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< ?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" android:layout_width="match_parent" android:gravity="center" android:layout_height="match_parent" android:orientation="vertical"> < android.support.v4.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true"> < LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" > < ImageView android:scaleType="fitXY" android:id="@+id/imageView3" android:layout_width="match_parent" android:layout_height="wrap_content" app:srcCompat="@drawable/a3" /> < ImageView android:scaleType="fitXY" android:id="@+id/imageView2" android:layout_width="match_parent" android:layout_height="wrap_content" app:srcCompat="@drawable/a1" /> < ImageView android:scaleType="fitXY" android:id="@+id/imageView7" android:layout_width="match_parent" android:layout_height="wrap_content" app:srcCompat="@drawable/a2" /> < ImageView android:scaleType="fitXY" android:id="@+id/imageView" android:layout_width="match_parent" android:layout_height="wrap_content" app:srcCompat="@drawable/a5" /> < ImageView android:scaleType="fitXY" android:id="@+id/imageView6" android:layout_width="match_parent" android:layout_height="wrap_content" app:srcCompat="@drawable/a4" /> < /LinearLayout> < /android.support.v4.widget.NestedScrollView> < /LinearLayout>

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【第三十五篇-AppBarLayout的使用】注：图片放在drawable下面。