我正在使用 pageradapter 和 viewpager 来显示 imageview 数组、textview 数组.但是如何在按钮单击时删除寻呼机.下面代码中的整个代码，但是我在 xml 中添加了按钮 onclick 应该删除页面.
I am using pageradapter and viewpager to display imageview array,textview array .But how do I delete pager on button click .Entire code in the code below ,but I have added button in xml onclick should delete the page.
https://www.swipetips.com/android-viewpager-gallery-images-and-texts-tutorial/
package com.androidbegin.viewpagertutorial;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class ViewPagerAdapter extends PagerAdapter {
// Declare Variables
Context context;
String[] rank;
String[] country;
String[] population;
int[] flag;
LayoutInflater inflater;
public ViewPagerAdapter(Context context, String[] rank, String[] country,
String[] population, int[] flag) {
this.context = context;
this.rank = rank;
this.country = country;
this.population = population;
this.flag = flag;
}
@Override
public int getCount() {
return rank.length;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(final ViewGroup container, final int position) {
// Declare Variables
TextView txtrank;
TextView txtcountry;
TextView txtpopulation;
ImageView imgflag;
Button b;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.viewpager_item, container,
false);
// Locate the TextViews in viewpager_item.xml
txtrank = (TextView) itemView.findViewById(R.id.rank);
txtcountry = (TextView) itemView.findViewById(R.id.country);
txtpopulation = (TextView) itemView.findViewById(R.id.population);
b=(Button)itemView.findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
});
// Capture position and set to the TextViews
txtrank.setText(rank[position]);
txtcountry.setText(country[position]);
txtpopulation.setText(population[position]);
// Locate the ImageView in viewpager_item.xml
imgflag = (ImageView) itemView.findViewById(R.id.flag);
// Capture position and set to the ImageView
imgflag.setImageResource(flag[position]);
// Add viewpager_item.xml to ViewPager
((ViewPager) container).addView(itemView);
return itemView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((RelativeLayout) object);
}
}
//////////////////
////////////////////
// Locate the ViewPager in viewpager_main.xml
viewPager = (ViewPager) findViewById(R.id.pager);
// Pass results to ViewPagerAdapter Class
adapter = new ViewPagerAdapter(MainActivity.this, rank, country, population, flag);
// Binds the Adapter to the ViewPager
viewPager.setAdapter(adapter);
首先需要使用List，因为动态删除对象.第二个你需要
first you need to use List because of dynamically deleting objects.
second you need
@Override
public int getItemPosition(Object object){
return PagerAdapter.POSITION_NONE;
}
强制适配器每次创建新页面，而不是在内存页面中使用.
to force the adapter to create new page each time and not using in memory pages.
public class ViewPagerAdapter extends PagerAdapter {
// Declare Variables
Context context;
List<String> rank;
List<String> country;
List<String> population;
List<Integer> flag = new ArrayList<Integer>();
LayoutInflater inflater;
public ViewPagerAdapter(Context context, String[] rank, String[] country,
String[] population, int[] flag) {
this.context = context;
this.rank = new ArrayList<String>(Arrays.asList(rank));
this.country = new ArrayList<String>(Arrays.asList(country));
this.population = new ArrayList<String>(Arrays.asList(population));
for (int i : flag){
this.flag.add(i);
}
}
@Override
public int getCount() {
return rank.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// Declare Variables
TextView txtrank;
TextView txtcountry;
TextView txtpopulation;
ImageView imgflag;
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.viewpager_item, container,
false);
// Locate the TextViews in viewpager_item.xml
txtrank = (TextView) itemView.findViewById(R.id.rank);
txtcountry = (TextView) itemView.findViewById(R.id.country);
txtpopulation = (TextView) itemView.findViewById(R.id.population);
Button b=(Button)itemView.findViewById(R.id.button1);
final int delPosition = position;
b.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
rank.remove(delPosition);
country.remove(delPosition);
population.remove(delPosition);
flag.remove(delPosition);
notifyDataSetChanged();
}
});
// Capture position and set to the TextViews
txtrank.setText(rank.get(position));
txtcountry.setText(country.get(position));
txtpopulation.setText(population.get(position));
// Locate the ImageView in viewpager_item.xml
imgflag = (ImageView) itemView.findViewById(R.id.flag);
// Capture position and set to the ImageView
imgflag.setImageResource(flag.get(position));
// Add viewpager_item.xml to ViewPager
((ViewPager) container).addView(itemView);
return itemView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// Remove viewpager_item.xml from ViewPager
((ViewPager) container).removeView((RelativeLayout) object);
}
@Override
public int getItemPosition(Object object){
return PagerAdapter.POSITION_NONE;
}
}
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