我有一个问题，在我的应用程序中我有一个视图寻呼机（在视图寻呼机上有3个项目的arraylist A显示3页），我使用了视图寻呼机循环，我跟随：http://social.technet.microsoft.com/wiki/contents/articles/1104.troubleshoot-and-optimize-queries-with-azure-sql-database.aspx 现在我有100个项目的arraylist B，我希望在浏览器循环中显示arraylist B中的项目值。
我怎么做？
package com.creativei.viewpagerloop;
import java.util.ArrayList;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
private static final String LOG_TAG = "ViewPagerLoop";
static ArrayList<data> arraydt = new ArrayList<data>();
ArrayList<data> str = new ArrayList<data>();
int Cur = 1;
static int lastPage = 1;
Button btnUp, btnDown;
static int nextId;
int id = 2;
private ViewPager pager;
private ArrayList<data> arraydt1= new ArrayList<data>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
str.add(new data("0", "hello0"));
str.add(new data("1", "hello1"));
str.add(new data("2", "hello2"));
str.add(new data("3", "hello3"));
str.add(new data("4", "hello4"));
str.add(new data("5", "hello5"));
str.add(new data("6", "hello6"));
str.add(new data("7", "hello7"));
str.add(new data("8", "hello8"));
str.add(new data("9", "hello9"));
arraydt.add(new data("1", "hello0"));
arraydt.add(new data("2", "hello1"));
arraydt.add(new data("3", "hello2"));
pager = (ViewPager) findViewById(R.id.pager);
TextView counter = (TextView) findViewById(R.id.counter);
SimpleViewPagerAdapter adapter = new SimpleViewPagerAdapter(this,
getSupportFragmentManager(), pager, counter, arraydt);
pager.setAdapter(adapter);
pager.setOnPageChangeListener(adapter);
pager.setCurrentItem(1, false);
pager.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
// TODO Auto-generated method stub
if (position == 0) {
pager.setCurrentItem(arraydt.size(), false);
} else if (position == arraydt.size() + 1) {
pager.setCurrentItem(1, false);
// counter.setText("1");
}
//
Log.d("POSITION", "" + position);
Log.d("Id hien tai", "" + nextId);
Log.d("ID", "" + id);
// if (nextId == 0)
if (nextId == 1) {
if (position == 2) {
id++;
if (id == str.size()) {
id = 0;
}
Log.d("+12 ", "" + id);
Log.d("Id", str.get(id).getText());
arraydt.set(1, str.get(id));
} else if (position == 3) {
id--;
if (id < 0) {
id = str.size() - 1;
}
Log.d("-13 ", "" + id);
Log.d("Id", str.get(id).getText());
arraydt.set(2, str.get(id));
}
// nextId = position;
} else if (nextId == 2) {
if (position == 3) {
id++;
if (id == str.size()) {
id = 0;
}
Log.d("+23 ", "" + id);
Log.d("Id", str.get(id).getText());
arraydt.set(0, str.get(id));
} else if (position == 1) {
id--;
if (id < 0) {
id = str.size() - 1;
}
Log.d("-21 ", "" + id);
Log.d("Id", str.get(id).getText());
arraydt.set(2, str.get(id));
}
// nextId = position;
} else if (nextId == 3) {
if (position == 1) {
id++;
if (id == str.size()) {
id = 0;
}
Log.d("+31 ", "" + id);
Log.d("Id", str.get(id).getText());
arraydt.set(1, str.get(id));
} else if (position == 2) {
id--;
if (id < 0) {
id = str.size() - 1;
}
Log.d("-32 ", "" + id);
Log.d("Id", str.get(id).getText());
arraydt.set(0, str.get(id));
}
// nextId = position;
} else if (nextId == 0) {
Toast.makeText(getApplication(), "000 " + nextId,
Toast.LENGTH_SHORT).show();
} else if (nextId == 4) {
Toast.makeText(getApplication(), "444 " + nextId,
Toast.LENGTH_SHORT).show();
}
nextId = pager.getCurrentItem();
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
}
public static class SimpleFragment extends Fragment {
private int position;
public SimpleFragment() {
// this.position=postiton;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
// String content1 = getArguments().getString("content");
int id1 = getArguments().getInt("position");
// int id = Integer.parseInt(content1);
// Log.d("Content", content1);
LinearLayout llayout = (LinearLayout) rootView
.findViewById(R.id.Llayout);
TextView tv = new TextView(getActivity());
tv.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT));
tv.setText(arraydt.get(id1).getText().toString()+" "+id1);
llayout.addView(tv);
return rootView;
}
}
public static class SimpleViewPagerAdapter extends
FragmentStatePagerAdapter implements OnPageChangeListener {
private ArrayList<data> arraydt;
private String[] content;
private ViewPager pager;
private TextView counter;
private Context context;
public SimpleViewPagerAdapter(Context context, FragmentManager fm,
ViewPager pager, TextView counter, ArrayList<data> arraydt) {
super(fm);
this.pager = pager;
this.counter = counter;
this.arraydt = arraydt;
this.context = context;
}
@Override
public Fragment getItem(int position) {
SimpleFragment fragment = new SimpleFragment();
Bundle bundle = new Bundle();
int index = position - 1;
if (position == 0) {
index = arraydt.size() - 1;
} else if (position == arraydt.size() + 1) {
index = 0;
}
Log.d(LOG_TAG, "For page at position " + position
+ ",fetching item at index " + index);
bundle.putInt("position", index);
fragment.setArguments(bundle);
return fragment;
}
@Override
public int getCount() {
return arraydt.size() + 2;
}
@Override
public void onPageSelected(int position) {
Log.d("nextId", "" + position);
nextId = position;
}
private String makeCounterText(int pageNo) {
return "Page " + pageNo + " of " + arraydt.size();
}
@Override
public void onPageScrollStateChanged(int arg0) {
Toast.makeText(context, "arg0: " + arg0, Toast.LENGTH_LONG).show();
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.creativei.viewpagerloop.MainActivity"
tools:ignore="MergeRootFrame" >
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/counter" />
<TextView
android:id="@+id/counter"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:gravity="center_horizontal" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.creativei.viewpagerloop.SimpleFragment" >
<TextView
android:id="@+id/content"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:id="@+id/Llayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
</LinearLayout>
</RelativeLayout>
答案 0 :(得分：0)
您可以使用相同的机制，但更改某些逻辑以动态加载数据，这是我的建议：
假设您的ArrayList不应超过5个元素（不占用太多内存）。
您第一次只能加载5个元素：B99-B100-B1-B2-B3。
当前页面为B1，您已经有下一页和前两页（在切换时准备数据）。
如果您切换到右侧（B1-> B2）：删除B99并加载B4（在后台），这样您的列表就会变为B100-B1-B2-B3-B4。
如果切换到leftt（B1-> B100）：删除B3并加载B98（在后台），这样您的列表就会变为B98-B99-B100-B1-B2。
请注意，更新列表后，当前/可见页面的位置将发生变化。你必须处理这个问题。