Android viewpager在最後一頁滑動之後跳轉到首頁面的執行個體代碼_Android

先給大家說下實現思路

主要有是兩個監聽：

一是addOnPageChangeListener();二是setOnTouchListener()；

addOnPageChangeListener()主要是為了擷取position(滑動到了第幾頁)

setOnTouchListener()主要是判斷在最後一頁中是否向左滑動了，然後進入首頁

在沒給大家分享代碼之前，先給大家展示下效果圖：

主要功能代碼

addOnPageChangeListener();viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {currentItem = position;//擷取位置，即第幾頁Log.i("Guide","監聽改變"+position);}@Overridepublic void onPageScrollStateChanged(int state) {}}); setOnTouchListener()；viewPager.setOnTouchListener(new View.OnTouchListener() {float startX;float startY;//沒有用到float endX;float endY;//沒有用到@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()){case MotionEvent.ACTION_DOWN:startX=event.getX();startY=event.getY();break;case MotionEvent.ACTION_UP:endX=event.getX();endY=event.getY();WindowManager windowManager= (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);//擷取螢幕的寬度Point size = new Point();windowManager.getDefaultDisplay().getSize(size);int width=size.x;//首先要確定的是，是否到了最後一頁，然後判斷是否向左滑動，並且滑動距離是否符合，我這裡的判斷距離是螢幕寬度的4分之一（這裡可以適當控制）if(currentItem==(imageViews.size()-1)&&startX-endX>=(width/4)){Log.i(LOG,"進入了觸摸");goToMainActivity();//進入首頁overridePendingTransition(R.anim.slide_in_right,R.anim.slide_in_left);//這部分代碼是切換Activity時的動畫，看起來就不會很生硬}break;}return false;}});

以下是全部代碼

GuideActivitypackage com.tc.mobileshop;import android.content.Context;import android.content.Intent;import android.graphics.Point;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.Display;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.ImageView;import com.tc.mobileshop.utils.DisplayUtils;import java.util.ArrayList;import java.util.List;public class GuideActivity extends AppCompatActivity {private static final String LOG = "GuideActivity";int touchCount;int currentItem;List<Integer> imageIDList;List<ImageView> imageViews;ViewPager viewPager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_guide);//初始化引導資料initGuideData();//初始化引導頁initGuideView();//初始化分頁控制項iniView();}/*** 初始化引導頁資料*/private void initGuideData() {imageIDList = new ArrayList();imageIDList.add(R.mipmap.apk_img1);imageIDList.add(R.mipmap.apk_img2);imageIDList.add(R.mipmap.apk_img3);}/*** 初始化引導頁*/private void initGuideView() {imageViews = new ArrayList<>();for (int i = 0; i < imageIDList.size(); i++) {imageViews.add(new ImageView(this));}}/*** 初始化分頁控制項*/private void iniView() {viewPager = (ViewPager) findViewById(R.id.guide_pager);viewPager.setAdapter(new GuideAdapter());viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {currentItem = position;Log.i("Guide","監聽改變"+position);}@Overridepublic void onPageScrollStateChanged(int state) {}});viewPager.setOnTouchListener(new View.OnTouchListener() {float startX;float startY;float endX;float endY;@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()){case MotionEvent.ACTION_DOWN:startX=event.getX();startY=event.getY();break;case MotionEvent.ACTION_UP:endX=event.getX();endY=event.getY();WindowManager windowManager= (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);//擷取螢幕的寬度Point size = new Point();windowManager.getDefaultDisplay().getSize(size);int width=size.x;//首先要確定的是，是否到了最後一頁，然後判斷是否向左滑動，並且滑動距離是否符合，我這裡的判斷距離是螢幕寬度的4分之一（這裡可以適當控制）if(currentItem==(imageViews.size()-1)&&startX-endX>0&&startX-endX>=(width/4)){Log.i(LOG,"進入了觸摸");goToMainActivity();overridePendingTransition(R.anim.slide_in_right,R.anim.slide_in_left);}break;}return false;}});}private void goToMainActivity() {Intent intent=new Intent(this,MainActivity.class);startActivity(intent);finish();}/*** Viewpager適配器*/private class GuideAdapter extends PagerAdapter {@Overridepublic int getCount() {return imageViews.size();}/*** 判斷當前分頁是不是view* 由於ViewPager裡面的分頁可以填入Fragment** @param view* @param object* @return*/@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}/*** 清理記憶體* 從第一頁滑動到第二頁，此時第一頁的記憶體應該釋放** @param container* @param position* @param object*/@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {container.removeView(imageViews.get(position));//釋放滑動過後的前一頁}/*** 得到---->暫時是沒有用的** @param object* @return*/@Overridepublic int getItemPosition(Object object) {return super.getItemPosition(object);}/*** 初始化分頁** @param container* @param position* @return*/@Overridepublic Object instantiateItem(ViewGroup container, int position) {ImageView imageView = imageViews.get(position);imageView.setImageResource(imageIDList.get(position));ViewGroup.LayoutParams viewLayoutParams = new ViewGroup.LayoutParams(DisplayUtils.dip2px(GuideActivity.this, 170),DisplayUtils.dip2px(GuideActivity.this, 200));container.addView(imageView,viewLayoutParams);//設定圖片的寬高return imageView;}}}

以下為動畫資源代碼

slide_in_left.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"><translateandroid:duration="1000"android:fromXDelta="0%p"android:toXDelta="-100%"/></set> slide_in_right.xml<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"><translateandroid:duration="1000"android:fromXDelta="100%p"android:toXDelta="0"/></set>

以上所述是小編給大家介紹的Android viewpager在最後一頁滑動之後跳轉到首頁面的執行個體代碼，希望對大家有所協助，如果大家有任何疑問請給我留言，小編會及時回複大家的。在此也非常感謝大家對雲棲社區網站的支援！