如何使用TimeTask自动滑动ViewPager图像 [英] How to swipe ViewPager images automatically using TimeTask
本文介绍了如何使用TimeTask自动滑动ViewPager图像的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我是android的新手,在我的应用程序中,ArrayList
中有很多图像
为什么我想在Timetasker
的帮助下每3秒钟自动刷一次这些图像,并且这个过程一直都需要重复进行,直到我们关闭应用程序.可以帮我一下吗
Hi I am new in android and in my app I have a lot of images in my ArrayList
that 's
why I want to swipe those images automatically for every 3 seconds with help of Timetasker
and this process is continuously need to repeating up to we close app. Can some body help me please
public class MainActivity extends AppCompatActivity {
ViewPager viewPager;
Integer[] imageId = {R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4};
String[] imagesName = {"image1","image2","image3","image4"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
viewPager = (ViewPager) findViewById(R.id.viewPager);
PagerAdapter adapter = new CustomAdapter(MainActivity.this,imageId,imagesName);
viewPager.setAdapter(adapter);
}
}
CustomAdapter:-
public class CustomAdapter extends PagerAdapter{
private Activity activity;
private Integer[] imagesArray;
private String[] namesArray;
public CustomAdapter(Activity activity,Integer[] imagesArray,String[] namesArray){
this.activity = activity;
this.imagesArray = imagesArray;
this.namesArray = namesArray;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
LayoutInflater inflater = ((Activity)activity).getLayoutInflater();
View viewItem = inflater.inflate(R.layout.image_item, container, false);
ImageView imageView = (ImageView) viewItem.findViewById(R.id.imageView);
imageView.setImageResource(imagesArray[position]);
TextView textView1 = (TextView) viewItem.findViewById(R.id.textview);
textView1.setText(namesArray[position]);
((ViewPager)container).addView(viewItem);
return viewItem;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return imagesArray.length;
}
@Override
public boolean isViewFromObject(View view, Object object) {
// TODO Auto-generated method stub
return view == ((View)object);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
((ViewPager) container).removeView((View) object);
}
}
推荐答案
Your question is already answered here
将此添加到您的MainActivity.java
Add this in your MainActivity.java
//...
int currentPage = 0;
Timer timer;
final long DELAY_MS = 500;//delay in milliseconds before task is to be executed
final long PERIOD_MS = 3000; // time in milliseconds between successive task executions.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
viewPager = (ViewPager) findViewById(R.id.viewPager);
PagerAdapter adapter = new CustomAdapter(MainActivity.this,imageId,imagesName);
viewPager.setAdapter(adapter);
/*After setting the adapter use the timer */
final Handler handler = new Handler();
final Runnable Update = new Runnable() {
public void run() {
if (currentPage == NUM_PAGES-1) {
currentPage = 0;
}
viewPager.setCurrentItem(currentPage++, true);
}
};
timer = new Timer(); // This will create a new Thread
timer.schedule(new TimerTask() { // task to be scheduled
@Override
public void run() {
handler.post(Update);
}
}, DELAY_MS, PERIOD_MS);
}
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