第三十五篇-AppBarLayout的使用

效果图：

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。

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

page2

page3

附上代码

main.java

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];

        }

    }

}

MyFragment1.java

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;

    }

}

MyFragment2.java

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;

    }

}

MyFragment3.java

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;

    }

}

main.xml

<?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="@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>

layout_page1.xml

<?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>

layout_page2.xml

<?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>

layout_page3.xml

<?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>

注：图片放在drawable下面。

巴特西

第三十五篇-AppBarLayout的使用

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