public class MainActivity extends AppCompatActivity {private static ViewPager viewPager;private RadioGroup group;//圖片資源，實際項目需要從網(wǎng)絡(luò)獲取private int[] imageIds = {R.drawable.ym1, R.drawable.ym2, R.drawable.ym3, R.drawable.ym4};//存放圖片的數(shù)組private List<ImageView> mList;//當(dāng)前索引位置以及上一個索引位置private static int index = 0, preIndex = 0;//是否需要輪播標(biāo)志private boolean isContinue = true;//定時器，用于實現(xiàn)輪播private Timer timer = new Timer();private MyHandler mHandler;public static class MyHandler extends Handler {private WeakReference<MainActivity> weakReference;public MyHandler(MainActivity activity) {weakReference = new WeakReference<>(activity);}@Overridepublic void handleMessage(Message msg) {if (weakReference.get() != null) {index++;viewPager.setCurrentItem(index);}super.handleMessage(msg);}}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();addListener();//讓當(dāng)前圖片位于中間某個位置，目的就是為了開始能夠左滑viewPager.setCurrentItem(imageIds.length * 100);initRadioButton(imageIds.length);//注意這句和上面那句順序不能寫反，否則會出現(xiàn)第一個圓點無法顯示選中狀態(tài)startSwitch();}/*** 初始化控件*/public void initView() {viewPager = (ViewPager) findViewById(R.id.viewpager);group = (RadioGroup) findViewById(R.id.group);}/*** 初始化數(shù)據(jù)*/public void initData() {mList = new ArrayList<>();viewPager.setAdapter(pagerAdapter);mHandler = new MyHandler(this);}/*** 添加監(jiān)聽*/public void addListener() {viewPager.addOnPageChangeListener(onPageChangeListener);viewPager.setOnTouchListener(onTouchListener);}/*** 進行圖片輪播*/public void startSwitch() {//執(zhí)行定時任務(wù)timer.schedule(new TimerTask() {@Overridepublic void run() {//首先判斷是否需要輪播，是的話我們才發(fā)消息if (isContinue) {mHandler.sendEmptyMessage(1);}}}, 3000, 3500);//延遲3秒，每隔3.5秒發(fā)一次消息;}/*** 根據(jù)圖片個數(shù)初始化按鈕* @param length 圖片所在集合長度*/private void initRadioButton(int length) {for (int i = 0; i < length; i++) {ImageView imageview = new ImageView(this);imageview.setImageResource(R.drawable.rg_selector);//設(shè)置背景選擇器imageview.setPadding(20, 0, 0, 0);//設(shè)置每個按鈕之間的間距//將按鈕依次添加到RadioGroup中g(shù)roup.addView(imageview, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);//默認(rèn)選中第一個按鈕，因為默認(rèn)顯示第一張圖片group.getChildAt(0).setEnabled(false);}}/*** 根據(jù)當(dāng)前觸摸事件判斷是否要輪播*/View.OnTouchListener onTouchListener = new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {//手指按下和劃動的時候停止圖片的輪播case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:isContinue = false;break;default:isContinue = true;}return false;//注意這里只能返回false,如果返回true，Dwon就會消費掉事件，MOVE無法獲得事件，// 導(dǎo)致圖片無法滑動}};/*** 根據(jù)當(dāng)前選中的頁面設(shè)置按鈕的選中*/ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {index = position;//當(dāng)前位置賦值給索引setCurrentDot(index % imageIds.length);//因為只有四個按鈕，所以我們在此要對長度區(qū)域，保證范圍在0到4}@Overridepublic void onPageScrollStateChanged(int state) {}};/*** 設(shè)置對應(yīng)位置按鈕的狀態(tài)* @param i 當(dāng)前位置*/private void setCurrentDot(int i) {if (group.getChildAt(i) != null) {group.getChildAt(i).setEnabled(false);//當(dāng)前按鈕選中,顯示藍(lán)色}if (group.getChildAt(preIndex) != null) {group.getChildAt(preIndex).setEnabled(true);//上一個取消選中。顯示灰色preIndex = i;//當(dāng)前位置變?yōu)樯弦粋€，繼續(xù)下次輪播}}PagerAdapter pagerAdapter = new PagerAdapter() {@Overridepublic int getCount() {//返回一個比較大的值，目的是為了實現(xiàn)無限輪播return Integer.MAX_VALUE;}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {position = position % imageIds.length;//因為position非常大，而我們需要的position不能大于圖片集合長度//所以在此取余ImageView imageView = new ImageView(MainActivity.this);imageView.setImageResource(imageIds[position]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);container.addView(imageView);mList.add(imageView);return imageView;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {// 注意在此不要做任何操作，因為我們需要實現(xiàn)向左滑動，否則會產(chǎn)生IndexOutOfBoundsException}};@Overrideprotected void onDestroy() {super.onDestroy();//頁面銷毀的時候取消定時器if (timer != null) {preIndex = 0;timer.cancel();}}}

public class MainActivity extends AppCompatActivity {private static ViewPager viewPager;private RadioGroup group;//圖片資源，實際項目需要從網(wǎng)絡(luò)獲取private int[] imageIds = {R.drawable.ym1, R.drawable.ym2, R.drawable.ym3, R.drawable.ym4};//存放圖片的數(shù)組private List<ImageView> mList;//當(dāng)前索引位置以及上一個索引位置private static int index = 0, preIndex = 0;//是否需要輪播標(biāo)志private boolean isContinue = true;//定時器，用于實現(xiàn)輪播private Timer timer = new Timer();private MyHandler mHandler;public static class MyHandler extends Handler {private WeakReference<MainActivity> weakReference;public MyHandler(MainActivity activity) {weakReference = new WeakReference<>(activity);}@Overridepublic void handleMessage(Message msg) {if (weakReference.get() != null) {index++;viewPager.setCurrentItem(index);}super.handleMessage(msg);}}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();addListener();initRadioButton(imageIds.length);startSwitch();}/*** 初始化控件*/public void initView() {viewPager = (ViewPager) findViewById(R.id.viewpager);group = (RadioGroup) findViewById(R.id.group);}/*** 初始化數(shù)據(jù)*/public void initData() {mList = new ArrayList<>();viewPager.setAdapter(pagerAdapter);mHandler = new MyHandler(this);}/*** 添加監(jiān)聽*/public void addListener() {viewPager.addOnPageChangeListener(onPageChangeListener);viewPager.setOnTouchListener(onTouchListener);}/*** 進行圖片輪播*/public void startSwitch() {//執(zhí)行定時任務(wù)timer.schedule(new TimerTask() {@Overridepublic void run() {//首先判斷是否需要輪播，是的話我們才發(fā)消息if (isContinue) {mHandler.sendEmptyMessage(1);}}}, 3000, 3500);//延遲3秒，每隔3.5秒發(fā)一次消息;}/*** 根據(jù)圖片個數(shù)初始化按鈕* @param length 圖片所在集合長度*/private void initRadioButton(int length) {for (int i = 0; i < length; i++) {ImageView imageview = new ImageView(this);imageview.setImageResource(R.drawable.rg_selector);//設(shè)置背景選擇器imageview.setPadding(20, 0, 0, 0);//設(shè)置每個按鈕之間的間距//將按鈕依次添加到RadioGroup中g(shù)roup.addView(imageview, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);//默認(rèn)選中第一個按鈕，因為默認(rèn)顯示第一張圖片group.getChildAt(0).setEnabled(false);}}/*** 根據(jù)當(dāng)前觸摸事件判斷是否要輪播*/View.OnTouchListener onTouchListener = new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {//手指按下和劃動的時候停止圖片的輪播case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:isContinue = false;break;default:isContinue = true;}return false;//注意這里只能返回false,如果返回true，Dwon就會消費掉事件，MOVE無法獲得事件，// 導(dǎo)致圖片無法滑動}};/*** 根據(jù)當(dāng)前選中的頁面設(shè)置按鈕的選中*/ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {index = position;//當(dāng)前位置賦值給索引setCurrentDot(index % imageIds.length);//因為只有四個按鈕，所以我們在此要對長度區(qū)域，保證范圍在0到4}@Overridepublic void onPageScrollStateChanged(int state) {}};/*** 設(shè)置對應(yīng)位置按鈕的狀態(tài)* @param i 當(dāng)前位置*/private void setCurrentDot(int i) {if (group.getChildAt(i) != null) {group.getChildAt(i).setEnabled(false);//當(dāng)前按鈕選中,顯示藍(lán)色}if (group.getChildAt(preIndex) != null) {group.getChildAt(preIndex).setEnabled(true);//上一個取消選中。顯示灰色preIndex = i;//當(dāng)前位置變?yōu)樯弦粋€，繼續(xù)下次輪播}}PagerAdapter pagerAdapter = new PagerAdapter() {@Overridepublic int getCount() {//返回一個比較大的值，目的是為了實現(xiàn)無限輪播return Integer.MAX_VALUE;}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {position = position % imageIds.length;//因為position非常大，而我們需要的position不能大于圖片集合長度//所以在此取余ImageView imageView = new ImageView(MainActivity.this);imageView.setImageResource(imageIds[position]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);container.addView(imageView);mList.add(imageView);return imageView;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {container.removeView(mList.get(position));}};@Overrideprotected void onDestroy() {super.onDestroy();//頁面銷毀的時候取消定時器if (timer != null) {preIndex = 0;index = 0;timer.cancel();}}}

public class MainActivity extends AppCompatActivity {private static ViewPager viewPager;private RadioGroup group;//圖片資源，實際項目需要從網(wǎng)絡(luò)獲取// private int[] imageIds = {R.drawable.ym1, R.drawable.ym2, R.drawable.ym3, R.drawable.ym4};private int[] imageIds = {R.drawable.ym1};//存放圖片的數(shù)組private List<ImageView> mList;//當(dāng)前索引位置以及上一個索引位置private static int index = 0, preIndex = 0;//是否需要輪播標(biāo)志private boolean isContinue = true;//定時器，用于實現(xiàn)輪播private Timer timer = new Timer();private MyHandler mHandler;public static class MyHandler extends Handler {private WeakReference<MainActivity> weakReference;public MyHandler(MainActivity activity) {weakReference = new WeakReference<>(activity);}@Overridepublic void handleMessage(Message msg) {if (weakReference.get() != null) {index++;viewPager.setCurrentItem(index);}super.handleMessage(msg);}}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initData();addListener();initRadioButton(imageIds.length);//注意這句和上面那句順序不能寫反，否則會出現(xiàn)第一個圓點無法顯示選中狀態(tài)startSwitch();}/*** 初始化控件*/public void initView() {viewPager = (ViewPager) findViewById(R.id.viewpager);group = (RadioGroup) findViewById(R.id.group);}/*** 初始化數(shù)據(jù)*/public void initData() {mList = new ArrayList<>();viewPager.setAdapter(pagerAdapter);mHandler = new MyHandler(this);}/*** 添加監(jiān)聽*/public void addListener() {viewPager.addOnPageChangeListener(onPageChangeListener);viewPager.setOnTouchListener(onTouchListener);}/*** 進行圖片輪播*/public void startSwitch() {//執(zhí)行定時任務(wù)timer.schedule(new TimerTask() {@Overridepublic void run() {//首先判斷是否需要輪播，是的話我們才發(fā)消息if (isContinue) {if(imageIds.length!=1)//多于一張圖片才輪播mHandler.sendEmptyMessage(1);}}}, 3000, 3500);//延遲3秒，每隔3.5秒發(fā)一次消息;}/*** 根據(jù)圖片個數(shù)初始化按鈕* @param length 圖片所在集合長度*/private void initRadioButton(int length) {for (int i = 0; i < length; i++) {ImageView imageview = new ImageView(this);if(length == 1){imageview.setVisibility(View.GONE);return;}imageview.setImageResource(R.drawable.rg_selector);//設(shè)置背景選擇器imageview.setPadding(20, 0, 0, 0);//設(shè)置每個按鈕之間的間距//將按鈕依次添加到RadioGroup中g(shù)roup.addView(imageview, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);//默認(rèn)選中第一個按鈕，因為默認(rèn)顯示第一張圖片group.getChildAt(0).setEnabled(false);}}/*** 根據(jù)當(dāng)前觸摸事件判斷是否要輪播*/View.OnTouchListener onTouchListener = new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {//手指按下和劃動的時候停止圖片的輪播case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:isContinue = false;break;default:isContinue = true;}if(imageIds.length == 1){return true;//1張圖片不允許滑動}return false;//注意這里只能返回false,如果返回true，Dwon就會消費掉事件，MOVE無法獲得事件，// 導(dǎo)致圖片無法滑動}};/*** 根據(jù)當(dāng)前選中的頁面設(shè)置按鈕的選中*/ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {index = position;//當(dāng)前位置賦值給索引setCurrentDot(index % imageIds.length);//因為只有四個按鈕，所以我們在此要對長度區(qū)域，保證范圍在0到4}@Overridepublic void onPageScrollStateChanged(int state) {}};/*** 設(shè)置對應(yīng)位置按鈕的狀態(tài)* @param i 當(dāng)前位置*/private void setCurrentDot(int i) {if (group.getChildAt(i) != null) {group.getChildAt(i).setEnabled(false);//當(dāng)前按鈕選中,顯示藍(lán)色}if (group.getChildAt(preIndex) != null) {group.getChildAt(preIndex).setEnabled(true);//上一個取消選中。顯示灰色preIndex = i;//當(dāng)前位置變?yōu)樯弦粋€，繼續(xù)下次輪播}}PagerAdapter pagerAdapter = new PagerAdapter() {@Overridepublic int getCount() {//返回一個比較大的值，目的是為了實現(xiàn)無限輪播return Integer.MAX_VALUE;}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic Object instantiateItem(ViewGroup container, int position) {position = position % imageIds.length;//因為position非常大，而我們需要的position不能大于圖片集合長度//所以在此取余ImageView imageView = new ImageView(MainActivity.this);imageView.setImageResource(imageIds[position]);imageView.setScaleType(ImageView.ScaleType.FIT_XY);container.addView(imageView);mList.add(imageView);return imageView;}@Overridepublic void destroyItem(ViewGroup container, int position, Object object) {// 注意在此不要做任何操作，因為我們需要實現(xiàn)向左滑動，否則會產(chǎn)生IndexOutOfBoundsExceptioncontainer.removeView(mList.get(position));}};@Overrideprotected void onDestroy() {super.onDestroy();//頁面銷毀的時候取消定時器if (timer != null) {preIndex = 0;index = 0;timer.cancel();}}}