Android custom control 6-Implementation of carousel image advertisement and android6 --

Android custom control 6-Implementation of carousel image advertisement and android6 --

This article continues to implement the monitoring and rolling of carousel images and advertisements.

URL: http://www.cnblogs.com/wuyudong/p/5920757.html.

First, add the layout file to implement

Shape_bg_point_enable.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval" >    <corners android:radius="5dp" />    <solid android:color="@android:color/white" /></shape>

Shape_bg_point_disable.xml

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="oval" >    <corners android:radius="5dp" />    <solid android:color="@android:color/darker_gray" /></shape>

Add another selector.

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:state_enabled="true" android:drawable="@drawable/shape_bg_point_enable"></item>    <item android:state_enabled="false" android:drawable="@drawable/shape_bg_point_disable"></item></selector>

Add selector to view:

For (int I = 0; I <imageResIds. length; I ++) {imageView = new ImageView (this); imageView. setBackgroundResource (imageResIds [I]); imageViewList. add (imageView); // add a white dot, indicator pointView = new View (this); pointView. setBackgroundResource (R. drawable. selector_bg_point); layoutParams = new LayoutParams (7, 7); if (I! = 0) {layoutParams. leftMargin = 10;} pointView. setEnabled (false); ll_point_container.addView (pointView, layoutParams );}

Add a sliding listener for ViewPager

Public class MainActivity extends Activity implements OnPageChangeListener ...... @ Override public void onPageScrolled (int position, float positionOffset, int positionOffsetPixels) {// call during scrolling} @ Override public void onPageSelected (int position) {// call position = position % 5; TV _desc.setText (contentDesc [position]) when the new entry is selected; // disable the previous one and enable the latest ll_point_container.getChildAt (lastEnablePoint ). setEnabled (false); ll_point_container.getChildAt (position ). setEnabled (true); lastEnablePoint = position;} @ Override public void onPageScrollStateChanged (int state) {// called when the rolling status changes}

Enable automatic page round robin:

// Enable polling for new Thread () {public void run () {while (isRunning) {try {Thread. sleep (2000);} catch (InterruptedException e) {e. printStackTrace ();} // jump down to a runOnUiThread (new Runnable () {@ Override public void run () {viewPager. setCurrentItem (viewPager. getCurrentItem () + 1 );}});}};}. start ();

The complete code is as follows:

Package com. wuyudong. viewpager; import java. util. arrayList; import android. r. layout; import android. OS. bundle; import android. app. activity; import android. support. v4.view. pagerAdapter; import android. support. v4.view. viewPager; import android. support. v4.view. viewPager. onPageChangeListener; import android. view. menu; import android. view. view; import android. view. viewGroup; import android. widget. baseAdapter; impor T android. widget. imageView; import android. widget. linearLayout; import android. widget. linearLayout. layoutParams; import android. widget. textView; public class MainActivity extends Activity implements OnPageChangeListener {private ViewPager viewPager; private int [] imageResIds; private ArrayList <ImageView> imageViewList; private ArrayList <View> pointViews; private LinearLayout parameters; priva Te String [] contentDesc; private TextView TV _desc; private int lastEnablePoint = 0; private boolean isRunning = true; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // initialize the Layout View initViews (); // Model data initData (); // Controller initAdapter (); // enable polling new Thread () {public void run () {while (isRunnin G) {try {Thread. sleep (2000);} catch (InterruptedException e) {e. printStackTrace ();} // jump down to a runOnUiThread (new Runnable () {@ Override public void run () {viewPager. setCurrentItem (viewPager. getCurrentItem () + 1 );}});}};}. start () ;}@ Override protected void onDestroy () {super. onDestroy (); isRunning = false;} private void initViews () {viewPager = (ViewPager) findViewById (R. id. viewpager ); ViewPager. setOnPageChangeListener (this); // sets the rolling update TV _desc = (TextView) findViewById (R. id. TV _desc); ll_point_container = (LinearLayout) findViewById (R. id. ll_point_container);} private void initAdapter () {ll_point_container.getChildAt (0 ). setEnabled (true); TV _desc.setText (contentDesc [0]); // sets the adapter viewPager. setAdapter (new MyAdapter (); // It is set to a certain position in the middle by default. int pos = Integer. MAX_VALUE/2; // viewPager. set CurrentItem (pos-3); viewPager. setCurrentItem (5000000);} private void initData () {// initialize the data to be displayed // image resource id array imageResIds = new int [] {R. drawable. a, R. drawable. b, R. drawable. c, R. drawable. d, R. drawable. e}; // text description contentDesc = new String [] {"Gong Li is not vulgar, so I cannot be vulgar", "Park Shu is back! Sing a classic old song to attract a chorus of thousands of people "," reveal how Beijing movies are upgraded "," letv TV edition big delivery "," hot-blooded anti-Kill "}; imageViewList = new ArrayList <ImageView> (); pointViews = new ArrayList <View> (); ImageView imageView; View pointView; LayoutParams layoutParams; for (int I = 0; I <imageResIds. length; I ++) {imageView = new ImageView (this); imageView. setBackgroundResource (imageResIds [I]); imageViewList. add (imageView); // add a white dot, indicator pointView = new View (this); poi NtView. setBackgroundResource (R. drawable. selector_bg_point); layoutParams = new LayoutParams (7, 7); if (I! = 0) {layoutParams. leftMargin = 10;} pointView. setEnabled (false); ll_point_container.addView (pointView, layoutParams);} class MyAdapter extends PagerAdapter {@ Override public int getCount () {return Integer. MAX_VALUE;} // 3. Specify the reusable judgment logic @ Override public boolean isViewFromObject (View view, Object object) {// when sliding to a new entry, return again, whether the view can be reused return view = object;} // 1. return the content of the entry to be displayed. Create the entry @ Override public Object instantiateItem (ViewGroup container, int position) {// container: ViewPager // position: position of the current entry to be displayed = position % 5; ImageView imageView = imageViewList. get (position); System. out. println ("instantItem creation:" + position); // a. Add the view object to the view iner. addView (imageView); // B. return the view object to the Framework. The adapter returns imageView. // It must be rewritten, otherwise, an exception is thrown.} // 2. The destroy entry @ Override public void destroyItem (ViewGroup container, int position, Object object) {// The object System to be destroyed. out. println ("destroyItem destruction:" + position); container. removeView (View) object); }}@ Override public void onPageScrolled (int position, float positionOffset, int positionOffsetPixels) {// call during scrolling} @ Override public void onPageSelected (int position) {// call position = position % 5 when the new entry is selected; TV _desc.setText (contentDesc [position]); // disable the previous one and enable the latest ll_point_container.getChildAt (lastEnablePoint ). setEnabled (false); ll_point_container.getChildAt (position ). setEnabled (true); lastEnablePoint = position;} @ Override public void onPageScrollStateChanged (int state) {// called when the rolling status changes }}