ViewPager滑动切换界面_android viewpager2 加载3个页面 ,从其他页面跳转到第三个页面会显示第一个页面然-优快云博客

本文链接：https://blog.youkuaiyun.com/droyon/article/details/8847489

本文介绍了一个使用ViewPager和Fragment实现的Android应用案例。通过自定义适配器和Fragment，实现了页面间的切换，并展示了如何加载不同布局及图片资源。此外，还集成了底部导航栏功能。

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转载请注明出处：http://blog.youkuaiyun.com/droyon/article/details/8847489

首先来看一下效果

源文件下载

资源layout

1，activity_main.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1">
        <android.support.v4.view.PagerTabStrip
                android:id="@+id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom"
                >
        </android.support.v4.view.PagerTabStrip>
    </android.support.v4.view.ViewPager>
	   <LinearLayout android:layout_width="fill_parent"
	    android:layout_height="wrap_content" android:orientation="horizontal" android:gravity="center">
	        <RadioGroup android:id="@+id/ra_group" android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content">
	            <RadioButton android:id="@+id/ra01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true"/>
	            <RadioButton android:id="@+id/ra02" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
	            <RadioButton android:id="@+id/ra03" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
	        </RadioGroup>
	   </LinearLayout>

</LinearLayout>

2,fragment.xml

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
<LinearLayout android:layout_height="fill_parent" android:layout_width="fill_parent">
    <ImageView android:id="@+id/img"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>
<LinearLayout android:layout_height="fill_parent" 
    android:layout_width="fill_parent"
    android:layout_gravity="center"
    android:gravity="center"
    >
        <TextView android:id="@+id/tv"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:gravity="center"
            />
</LinearLayout>

</FrameLayout>

3,fragment03.xml

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
<LinearLayout android:layout_height="fill_parent" android:layout_width="fill_parent">
    <ImageView android:id="@+id/img"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>
<LinearLayout android:layout_height="fill_parent" android:layout_width="fill_parent">
    <RelativeLayout android:layout_height="fill_parent" android:layout_width="fill_parent">
        <Button android:id="@+id/btn_start"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="50dp"
            />
    </RelativeLayout>
</LinearLayout>

</FrameLayout>

java代码：

1,MainActivity.java

package com.android.zhuoyang.pagefling;

import java.util.ArrayList;

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.LayoutParams;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.ViewFlipper;

@SuppressLint("ValidFragment")
public class MainActivity extends FragmentActivity {
	public static ArrayList<Drawable> mList = new ArrayList<Drawable>();
	
	private ViewPager mViewPager;
	private PagerTabStrip mViewFlipper;
	private FragmentPagerAdapter mAdapter;
	
	private RadioGroup mRadioGroup;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mList.add(getResources().getDrawable(R.drawable.png01));
		mList.add(getResources().getDrawable(R.drawable.png02));
		mList.add(getResources().getDrawable(R.drawable.png03));
		
		mViewPager = (ViewPager) findViewById(R.id.pager);
		mViewFlipper = (PagerTabStrip) findViewById(R.id.tabs);
		mAdapter = new MyViewPage(getSupportFragmentManager());
		
		mViewPager.setAdapter(mAdapter);
		mViewPager.setOnPageChangeListener(viewPagerOnChanged);
		
		mRadioGroup = (RadioGroup) findViewById(R.id.ra_group);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}
	class MyViewPage extends FragmentPagerAdapter{

		public MyViewPage(FragmentManager fm) {
			super(fm);
		}

		@Override
		public Fragment getItem(int position) {
			System.out.println("position is:"+position);
			return MyFragment.newInstance(position);
		}

		@Override
		public int getCount() {
			return mList.size();
		}
		
	}
	
	ViewPager.OnPageChangeListener viewPagerOnChanged = new OnPageChangeListener() {
		
		@Override
		public void onPageSelected(int position) {
			RadioButton button = (RadioButton) mRadioGroup.getChildAt(position);
			button.setChecked(true);
		}
		
		@Override
		public void onPageScrolled(int arg0, float arg1, int arg2) {
			
		}
		
		@Override
		public void onPageScrollStateChanged(int arg0) {
			
		}
	};
	
	static class MyFragment extends Fragment{
		int mPosition;
		public static Fragment newInstance(int position){
			MyFragment fragment = new MyFragment();
			Bundle bundle = new Bundle();
			bundle.putInt("position", position);
			fragment.setArguments(bundle);
			return fragment;
		}

		@Override
		public void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			mPosition = (getArguments()!=null)?getArguments().getInt("position"):0;
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View view = null;
			if(mPosition == mList.size()-1){
				view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment03, container,false);
				Button btn = (Button) view.findViewById(R.id.btn_start);
				btn.setText(R.string.third_tv);
			}else if(mPosition == mList.size()-3){
				view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment, container,false);
				TextView tv = (TextView) view.findViewById(R.id.tv);
				tv.setText(R.string.first_tv);
			}else if(mPosition == mList.size()-2){
				view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment, container,false);
				TextView tv = (TextView) view.findViewById(R.id.tv);
				tv.setText(R.string.second_tv);
			}
			ImageView imgView = (ImageView) view.findViewById(R.id.img);
			imgView.setImageDrawable(mList.get(mPosition));
			return view;
		}
		
		
	}
}