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小編給大家分享一下Android開發如何實現高仿優酷的客戶端圖片左右滑動切換功能,希望大家閱讀完這篇文章之后都有所收獲,下面讓我們一起去探討吧!
具體如下:
本例是用ViewPager去做的實現,支持自動滑動和手動滑動,不僅優酷網,實際上有很多商城和門戶網站都有類似的實現:
具體思路:
1. 工程中需要添加android-support-v4.jar,才能使用ViewPager控件.
2. 圖片的自動切換: 可使用Timer或者ScheduledExecutorService,這個有多重方式可以實現.
同時要切換底部的dots(園點)
3.Handler+Message機制更新UI,這個相信大家都很熟練,不再描述
4. 實現的一些細節:注意本例中的優化:圖片的自動切換啟動了其他的線程,要在Activity在可見到不可見的狀態,也就是在onStop()方法中將線程停止,在onStart()方法中開啟線程。否則,Timer沒有停止,或者反復開啟,會引起較大的內存消耗,時間一長就程序就會崩掉。 還有,就是在跳轉到其他Activity的過程中會出現畫面的卡頓
下面看一下效果圖和具體代碼:
工程結構如下圖所示:
main.xml:
然后是具體的布局文件及代碼實現:
main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFFFFF" android:orientation="vertical" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="40dip" android:background="@drawable/title_bk" > <ImageButton android:id="@+id/btn_back" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/btn_back_selector" android:src="@drawable/btn_back" /> <View android:id="@+id/line0" android:layout_width="1px" android:layout_height="fill_parent" android:layout_toRightOf="@id/btn_back" android:background="#aa11264f" /> <View android:layout_width="1px" android:layout_height="fill_parent" android:layout_toRightOf="@id/line0" android:background="#009ad6" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="優酷客戶端" android:textColor="#FFFFFF" android:textSize="20sp" /> </RelativeLayout> <FrameLayout android:layout_width="fill_parent" android:layout_height="140dip" > <android.support.v4.view.ViewPager android:id="@+id/vp" android:layout_width="fill_parent" android:layout_height="fill_parent" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="35dip" android:layout_gravity="bottom" android:background="#33000000" android:gravity="center" android:orientation="vertical" > <TextView android:id="@+id/tv_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="中國家庭院校園區域名字體現" android:textColor="#ffffff" /> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="3dip" android:gravity="center" > <View android:id="@+id/v_dot0" android:background="@drawable/dot_focused" /> <View android:id="@+id/v_dot1" /> <View android:id="@+id/v_dot2" /> <View android:id="@+id/v_dot3" /> <View android:id="@+id/v_dot4" /> </LinearLayout> </LinearLayout> </FrameLayout> </LinearLayout>
MyViewPagerActivity:
package com.tony.viewpager; import java.util.ArrayList; import java.util.List; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View; import android.widget.ImageView; import android.widget.ImageView.ScaleType; import android.widget.TextView; /** * 仿優酷Android客戶端圖片左右滑動 * */ public class MyViewPagerActivity extends Activity { private ViewPager viewPager; // android-support-v4中的滑動組件 private List<ImageView> imageViews; // 滑動的圖片集合 private String[] titles; // 圖片標題 private int[] imageResId; // 圖片ID private List<View> dots; // 圖片標題正文的那些點 private TextView tv_title; private int currentItem = 0; // 當前圖片的索引號 // An ExecutorService that can schedule commands to run after a given delay, // or to execute periodically. private ScheduledExecutorService scheduledExecutorService; // 切換當前顯示的圖片 private Handler handler = new Handler() { public void handleMessage(android.os.Message msg) { viewPager.setCurrentItem(currentItem);// 切換當前顯示的圖片 }; }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); imageResId = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.e }; titles = new String[imageResId.length]; titles[0] = "鞏俐不低俗,我就不能低俗"; titles[1] = "撲樹又回來啦!再唱經典老歌引萬人大合唱"; titles[2] = "揭秘北京電影如何升級"; titles[3] = "樂視網TV版大派送"; titles[4] = "熱血屌絲的反殺"; imageViews = new ArrayList<ImageView>(); // 初始化圖片資源 for (int i = 0; i < imageResId.length; i++) { ImageView imageView = new ImageView(this); imageView.setImageResource(imageResId[i]); imageView.setScaleType(ScaleType.CENTER_CROP); imageViews.add(imageView); } dots = new ArrayList<View>(); dots.add(findViewById(R.id.v_dot0)); dots.add(findViewById(R.id.v_dot1)); dots.add(findViewById(R.id.v_dot2)); dots.add(findViewById(R.id.v_dot3)); dots.add(findViewById(R.id.v_dot4)); tv_title = (TextView) findViewById(R.id.tv_title); tv_title.setText(titles[0]);// viewPager = (ViewPager) findViewById(R.id.vp); viewPager.setAdapter(new MyAdapter());// 設置填充ViewPager頁面的適配器 // 設置一個監聽器,當ViewPager中的頁面改變時調用 viewPager.setOnPageChangeListener(new MyPageChangeListener()); } @Override protected void onStart() { scheduledExecutorService = Executors.newSingleThreadScheduledExecutor(); // 當Activity顯示出來后,每兩秒鐘切換一次圖片顯示 scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 2, TimeUnit.SECONDS); super.onStart(); } @Override protected void onStop() { // 當Activity不可見的時候停止切換 scheduledExecutorService.shutdown(); super.onStop(); } /** * 換行切換任務 * * @author Administrator * */ private class ScrollTask implements Runnable { public void run() { synchronized (viewPager) { System.out.println("currentItem: " + currentItem); currentItem = (currentItem + 1) % imageViews.size(); handler.obtainMessage().sendToTarget(); // 通過Handler切換圖片 } } } /** * 當ViewPager中頁面的狀態發生改變時調用 * * @author Administrator * */ private class MyPageChangeListener implements OnPageChangeListener { private int oldPosition = 0; /** * This method will be invoked when a new page becomes selected. * position: Position index of the new selected page. */ public void onPageSelected(int position) { currentItem = position; tv_title.setText(titles[position]); dots.get(oldPosition).setBackgroundResource(R.drawable.dot_normal); dots.get(position).setBackgroundResource(R.drawable.dot_focused); oldPosition = position; } public void onPageScrollStateChanged(int arg0) { } public void onPageScrolled(int arg0, float arg1, int arg2) { } } /** * 填充ViewPager頁面的適配器 * * @author Administrator * */ private class MyAdapter extends PagerAdapter { @Override public int getCount() { return imageResId.length; } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(imageViews.get(arg1)); return imageViews.get(arg1); } @Override public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView((View) arg2); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) { } @Override public void finishUpdate(View arg0) { } } }
Drawable目錄下
btn_back_selector.xml:
<?xml version="1.0" encoding="utf-8"?> <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:drawable="@drawable/btn_top_pressed" android:state_focused="true"></item> <item android:drawable="@drawable/btn_top_pressed" android:state_pressed="true"></item> <item android:drawable="@drawable/btn_top_pressed" android:state_selected="true"></item> <item android:drawable="@drawable/title_bk"></item> </selector>
btn_top_pressed.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" > <gradient android:angle="270" android:endColor="#009ad6" android:startColor="#11264f" /> </shape>
dot_focused.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" > <solid android:color="#aaFFFFFF" /> <corners android:radius="5dip" /> </shape>
dot_normal.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" > <solid android:color="#33000000" /> <corners android:radius="5dip" /> </shape>
title_bk.xml:
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" > <gradient android:angle="270" android:endColor="#11264f" android:startColor="#009ad6" /> </shape>
看完了這篇文章,相信你對“Android開發如何實現高仿優酷的客戶端圖片左右滑動切換功能”有了一定的了解,如果想了解更多相關知識,歡迎關注億速云行業資訊頻道,感謝各位的閱讀!
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