ViewPager 实现循环拖动效果
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最近在研究viewpager,准备做循环拖动即A->B->C->A->B->C->A->...
找了一下相关资料,只有stactoverflow上有一条比较靠谱的资料,但是不全,自己琢磨了一下,实现了循环拖动。
这里只需要对pageadapter进行操作,源代码如下:
[code="java"]
public class ViewPagerAdapter extends PagerAdapter{
private List<View> views;
Context context;
int mCount;
public ViewPagerAdapter(Context context,List<View> views){
this.views=views;
this.context=context;
mCount = views.size() +1;
}
@Override
public void destroyItem(View collection, int position, Object arg2) {
if (position >= views.size()-1) {
int newPosition = position%views.size();
position = newPosition;
((ViewPager) collection).removeView(views.get(position));
}
}
@Override
public void finishUpdate(View arg0) {
}
@Override
public int getCount() {
return mCount;
}
@Override
public Object instantiateItem(View collection, int position) {
if (position >= views.size()-1) {
int newPosition = position%views.size();
position = newPosition;
mCount++;
}
try {
((ViewPager) collection).addView(views.get(position),0);
} catch (Exception e) {
}
return views.get(position);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view==(object);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
}
[/code]
再附上Activity的源码:
[code="java"]
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
public class ViewPageDemoActivity extends Activity {
ViewPager pager;
LayoutInflater inflater;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pager=(ViewPager) this.findViewById(R.id.view_pager);
inflater=LayoutInflater.from(this);
List<View> views=new ArrayList<View>();
View view1=inflater.inflate(R.layout.layout1, null);
View view2=inflater.inflate(R.layout.layout2, null);
View view3=inflater.inflate(R.layout.layout3, null);
Views.add(view1);
Views.add(view2);
Views.add(view3);
ViewPagAdapter adapter=new ViewPagAdapter(this, views);
pager.setAdapter(adapter);
}
}
[/code]
找了一下相关资料,只有stactoverflow上有一条比较靠谱的资料,但是不全,自己琢磨了一下,实现了循环拖动。
这里只需要对pageadapter进行操作,源代码如下:
[code="java"]
public class ViewPagerAdapter extends PagerAdapter{
private List<View> views;
Context context;
int mCount;
public ViewPagerAdapter(Context context,List<View> views){
this.views=views;
this.context=context;
mCount = views.size() +1;
}
@Override
public void destroyItem(View collection, int position, Object arg2) {
if (position >= views.size()-1) {
int newPosition = position%views.size();
position = newPosition;
((ViewPager) collection).removeView(views.get(position));
}
}
@Override
public void finishUpdate(View arg0) {
}
@Override
public int getCount() {
return mCount;
}
@Override
public Object instantiateItem(View collection, int position) {
if (position >= views.size()-1) {
int newPosition = position%views.size();
position = newPosition;
mCount++;
}
try {
((ViewPager) collection).addView(views.get(position),0);
} catch (Exception e) {
}
return views.get(position);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view==(object);
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
}
@Override
public Parcelable saveState() {
return null;
}
@Override
public void startUpdate(View arg0) {
}
}
[/code]
再附上Activity的源码:
[code="java"]
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
public class ViewPageDemoActivity extends Activity {
ViewPager pager;
LayoutInflater inflater;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pager=(ViewPager) this.findViewById(R.id.view_pager);
inflater=LayoutInflater.from(this);
List<View> views=new ArrayList<View>();
View view1=inflater.inflate(R.layout.layout1, null);
View view2=inflater.inflate(R.layout.layout2, null);
View view3=inflater.inflate(R.layout.layout3, null);
Views.add(view1);
Views.add(view2);
Views.add(view3);
ViewPagAdapter adapter=new ViewPagAdapter(this, views);
pager.setAdapter(adapter);
}
}
[/code]
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