我已经使用了Android的ViewPager来显示图片和文字,现在我想实现的是如果用户不主动滑动图片,则在几秒钟后自动更换图片,但当用户再次使用手指滑动时,图片就不会自动更换了。
我尝试使用Handler来创建延迟,但它对我没有起作用。
请帮帮我。
public class SimpleImageViewerActivity extends Activity implements ViewPager.OnPageChangeListener{
private Handler handler;
ViewPager myPager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.imageslideshow);
MyPagerAdapter adapter = new MyPagerAdapter();
myPager = (ViewPager) findViewById(R.id.slideShowPager);
myPager.setAdapter(adapter);
myPager.setCurrentItem(0);
handler = new Handler();
myPager.setOnPageChangeListener(this);
}
private class MyPagerAdapter extends PagerAdapter {
public int getCount() {
return 5;
}
public Object instantiateItem(View collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int resId = 0;
switch (position) {
case 0:
resId = R.layout.farleft;
break;
case 1:
resId = R.layout.left;
break;
case 2:
resId = R.layout.middle;
break;
case 3:
resId = R.layout.right;
break;
case 4:
resId = R.layout.farright;
break;
}
View view = inflater.inflate(resId, null);
((ViewPager) collection).addView(view, 0);
return view;
}
@Override
public void destroyItem(View arg0, int arg1, Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
// TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
updateUI(arg2);
}
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
//updateUI(arg0);
}
public void onNothingSelected(AdapterView<?> adapterView) {
final int i =0;
adapterView.postDelayed(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
updateUI(i);
}
}, 5000);
Toast.makeText(this, "In nothing selected method",Toast.LENGTH_SHORT).show();
}
private void updateUI(final int fi) {
/* handler.post(new Runnable() {
public void run() {
gallery.setSelection(i);
viewPager.setCurrentItem(i);
//textView.setText("Photo #" + i);
}
});*/
handler.postDelayed(new Runnable() {
public void run() {
int i=fi;
int j = i;
myPager.setCurrentItem(j++);
System.out.println("Hello");
}
},1000);
}
}