1
我有兩個viewpager我從第二個pager刪除一個viewpager的當前頁面。並在刷到下一個位置時再次添加刪除的頁面。第二個viewpager的過程相同。問題是添加和刪除方法工作正常，如果我在onCreate中使用它們，但不能在onPageSelected中工作。和其他問題是，如果我再次在同一位置添加任何刪除的頁面，它顯示我添加頁面viewpager的當前位置。我希望頁面只添加在特定位置，但不要設置在當前位置。 以下是我的code.Any幫助將不勝感激。添加/刪除方法在onCreate工作，但不是在onPageSelected
public class MainActivity extends FragmentActivity {
CustomViewPager pager1,pager2;
List<Fragment> fragments1,fragments2;
public PagerAdapter adapter1;
public PagerAdapter1 adapter2;
int lostPositionRight;
int lostPositionLeft;
ArrayList<String> image = new ArrayList<String>() {{
add("0");
add("1");
add("2");
add("3");
add("4");
}};
ArrayList<String> imageNew = new ArrayList<String>() {{
add("0");
add("1");
add("2");
add("3");
add("4");
}};
ArrayList<Integer> images = new ArrayList<Integer>() {{
add(R.drawable.first);
add(R.drawable.second);
add(R.drawable.three);
add(R.drawable.four);
add(R.drawable.xiaomi);
}};
ArrayList<Integer> imagesNew = new ArrayList<Integer>() {{
add(R.drawable.first);
add(R.drawable.second);
add(R.drawable.three);
add(R.drawable.four);
add(R.drawable.xiaomi);
}};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
pager1 = (CustomViewPager) findViewById(R.id.pager1);
fragments1 = getFragments1();
adapter1 = new PagerAdapter(getSupportFragmentManager(), fragments1);
pager1.setAdapter(adapter1);
removeView1(1);
lostPositionLeft = 1;
adapter1.notifyDataSetChanged();
pager2 = (CustomViewPager) findViewById(R.id.pager2);
fragments2 = getFragments2();
adapter2 = new PagerAdapter1(getSupportFragmentManager(), fragments2);
pager2.setAdapter(adapter2);
pager2.setCurrentItem(1);
removeView2(0);
lostPositionRight = 0;
pager1.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
MyImageSlider fragmntDta = (MyImageSlider)findFragmentByPosition(pager1.getCurrentItem());
String value = fragmntDta.getTextOnTextView();
int p = Integer.parseInt(value);
Toast toast = Toast.makeText(getApplicationContext(),"Text is " +p, Toast.LENGTH_SHORT);
toast.show();
addView2(lostPositionRight,lostPositionRight);
removeView2(p);
adapter2.notifyDataSetChanged();
lostPositionRight = p;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
pager2.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
MyImageSlider1 fragmntDta = (MyImageSlider1)findFragmentByPosition2(pager2.getCurrentItem());
String value1 = fragmntDta.getTextView();
Toast toast = Toast.makeText(getApplicationContext(),"Text is " +value1, Toast.LENGTH_SHORT);
toast.show();
int p = Integer.parseInt(value1);
addView1(lostPositionLeft,lostPositionLeft);
removeView1(p);
lostPositionLeft = p;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
public void addView1(int index,int position)
{
adapter1.addView1 (index,position);
adapter1.notifyDataSetChanged();
}
public void addView2(int index,int position)
{
adapter2.addView2 (index,position);
adapter2.notifyDataSetChanged();
}
public void removeView1 (int position)
{
adapter1.removeView1(pager1, position);
adapter1.notifyDataSetChanged();
}
public void removeView2 (int position)
{
adapter2.removeView2(pager2, position);
adapter2.notifyDataSetChanged();
}
public class PagerAdapter extends FragmentStatePagerAdapter {
private List<Fragment> fragments;
public PagerAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
@Override
public int getCount() {
return this.fragments.size();
}
@Override
public int getItemPosition (Object object)
{
return POSITION_NONE;
}
public int removeView1 (ViewPager pager, int position)
{
pager.setAdapter (null);
fragments.remove (position);
pager.setAdapter (this);
notifyDataSetChanged();
return position;
}
public void addView1 (int index,int position)
{
fragments.add(index,MyImageSlider.newInstance(images.get(position),image.get(position)));
notifyDataSetChanged();
}
}
private List<Fragment> getFragments1() {
List<Fragment> fList = new ArrayList<>();
for (int i = 0; i < images.size(); i++) {
fList.add(MyImageSlider.newInstance(images.get(i),image.get(i)));
}
return fList;
}
public static class MyImageSlider extends Fragment {
int imageid;
String newid;
TextView textView;
public static MyImageSlider newInstance(int id,String s)
{
MyImageSlider slider=new MyImageSlider();
Bundle b=new Bundle();
b.putInt("imageid", id);
b.putString("newid", s);
slider.setArguments(b);
return slider;
}
public String getTextOnTextView(){
return (String) textView.getText();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
imageid=getArguments().getInt("imageid");
newid = getArguments().getString("newid");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.leftpager,container, false);
ImageView iv=(ImageView)view.findViewById(R.id.image1);
textView = (TextView)view.findViewById(R.id.text);
iv.setImageResource(imageid);
textView.setText(newid);
return view;
}
}
public Fragment findFragmentByPosition(int position) {
PagerAdapter fragmentPagerAdapter = adapter1;
return getSupportFragmentManager().findFragmentByTag("android:switcher:" + pager1.getId() + ":" +
fragmentPagerAdapter.getItemId(position));
}
public class PagerAdapter1 extends FragmentStatePagerAdapter {
private List<Fragment> fragment;
public PagerAdapter1(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragment = fragments;
}
@Override
public Fragment getItem(int position) {
return this.fragment.get(position);
}
@Override
public int getCount() {
return this.fragment.size();
}
@Override
public int getItemPosition (Object object)
{
return POSITION_NONE;
}
public int removeView2 (ViewPager pager, int position)
{
pager.setAdapter (null);
fragment.remove (position);
pager.setAdapter (this);
notifyDataSetChanged();
return position;
}
public void addView2 (int index,int position)
{
fragment.add(index,MyImageSlider1.newInstance(imagesNew.get(position),imageNew.get(position)));
notifyDataSetChanged();
}
}
private List<Fragment> getFragments2() {
List<Fragment> fList = new ArrayList<Fragment>();
for (int i = 0; i < imagesNew.size(); i++) {
fList.add(MyImageSlider1.newInstance(imagesNew.get(i),imageNew.get(i)));
}
return fList;
}
public static class MyImageSlider1 extends Fragment {
int imageid;
String newid;
public TextView textView1;
public static MyImageSlider1 newInstance(int id,String s)
{
MyImageSlider1 slider=new MyImageSlider1();
Bundle b=new Bundle();
b.putInt("imageid", id);
b.putString("newid", s);
slider.setArguments(b);
return slider;
}
public String getTextView(){
return (String) textView1.getText();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
imageid=getArguments().getInt("imageid");
newid = getArguments().getString("newid");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.rightpager, container, false);
ImageView iv=(ImageView)view.findViewById(R.id.image2);
iv.setImageResource(imageid);
textView1 = (TextView)view.findViewById(R.id.text2);
textView1.setText(newid);
return view;
}
}
public Fragment findFragmentByPosition2(int position) {
PagerAdapter1 fragmentPagerAdapter2 = adapter2;
return getSupportFragmentManager().findFragmentByTag
("android:switcher:" + pager2.getId() + ":" + fragmentPagerAdapter2.getItemId(position));
}
}
嘗試使用FragmentStatePagerAdapter而不是FragmentPagerAdapter –
yuppp正常工作。但現在下面的方法創建問題，因爲它的使用方法FragmentPagerAdapter。這是什麼解決方案：public Fragment findFragmentByPosition（int position）PagerAdapter fragmentPagerAdapter = adapter1;返回getSupportFragmentManager（）。findFragmentByTag（「android：switcher：」+ pager1.getId（）+「：」+ fragmentPagerAdapter.getItemId（position））; } –
你是什麼意思？最新的問題是什麼？ –