viewpager的簡單實現

實現截圖:

具體佈局文件,一個主activity,三個tab佈局

主avtivity:

viewpager就像一個容器,上面的三個標籤就是pagerTabStrip,所以pagerTabStrip必須放到viewpager控件裏面

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   
    tools:context="my.microsoft.com.viewpagerdemo2.MainActivity">

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v4.view.PagerTabStrip
            android:id="@+id/tabstrip"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            >

        </android.support.v4.view.PagerTabStrip>
    </android.support.v4.view.ViewPager>
</RelativeLayout>

三個tab都一樣,只是顯示內容不同

<?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">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="tab1"/>

</LinearLayout>

下面是主要代碼:

package my.microsoft.com.viewpagerdemo1;

import android.graphics.Color;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    ViewPager viewPager=null;
    PagerTabStrip tabStrip=null;
    List<View> viewlist =new ArrayList<>();
    List<String> titlelist =new ArrayList<>();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager= (ViewPager) this.findViewById(R.id.viewpager);
        tabStrip= (PagerTabStrip) this.findViewById(R.id.tabstrip);
        //取消tab的下面的橫線顯示,可以不設置,因爲加背景色之後會把這條線覆蓋
        //tabStrip.setDrawFullUnderline(false);
        //設置tab的背景色
        tabStrip.setBackgroundColor(Color.YELLOW);
        //設置當前tab頁籤的下劃線顏色
        tabStrip.setTabIndicatorColor(Color.BLUE);
        //標籤文字之間的距離
        tabStrip.setTextSpacing(200);
        View view1= LayoutInflater.from(this).inflate(R.layout.tab1,null);
        View view2= LayoutInflater.from(this).inflate(R.layout.tab2,null);
        View view3= LayoutInflater.from(this).inflate(R.layout.tab3,null);
        viewlist.add(view1);
        viewlist.add(view2);
        viewlist.add(view3);
        titlelist.add("網易新聞");
        titlelist.add("網易體育");
        titlelist.add("網易遊戲");
        viewPager.setAdapter(new Myadater());

    }
    class Myadater extends PagerAdapter{

        //viewpager中的組件數量,就是佈局的個數
        @Override
        public int getCount() {
            return viewlist.size();
        }

        //滑動切換的時候銷燬當前的組件
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            //以下兩句話,可以合併爲一句((ViewPager) container).removeView(viewlist.get(position))
            ViewPager viewPager1= (ViewPager) container;
            viewPager1.removeView(viewlist.get(position));
            // super.destroyItem(container, position, object);
        }

        //每次滑動的時候生成的組件
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ViewPager viewPager1= (ViewPager) container;
            viewPager1.addView(viewlist.get(position));
            return viewlist.get(position);
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view==object;
        }

        //顯示標籤文字,沒有這個方法,標籤不顯示文字
        @Override
        public CharSequence getPageTitle(int position) {
            return titlelist.get(position);
        }
    }
}