Android(安卓)ViewPager循环左右自动滑动加载Page

package zhangphil.auto_viewpager;import java.util.ArrayList;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.view.ViewPager;import android.support.v7.app.ActionBarActivity;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.graphics.Color;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.SystemClock;/** * Android ViewPager循环左右自动滑动加载Page。 *   * 核心关键：使用 ViewPager的setCurrentItem(int index)左右自动循环加载。 * 思路：使用Android Handler，在Handler的handleMessage(Message msg)中收消息，收到消息就从msg中解析出需要加载的索引。 * 相应的，开辟一个线程，时隔两秒就用Handler发一个Message，触发Handler的handleMessage,从而调用ViewPager的setCurrentItem操作. */public class MainActivity extends ActionBarActivity {private ViewPager mViewPager;private final static String ID = "id";private ArrayList<Fragment> mArrayList;// 用以显示的Fragment总数，假设有5个.private final int SIZE = 5;private Handler handler;private final int WHAT = 0xf01;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mArrayList = new ArrayList<Fragment>();for (int i = 0; i < SIZE; i++) {Fragment f = new TestFragment();Bundle b = new Bundle();b.putInt(ID, i);f.setArguments(b);mArrayList.add(f);}mViewPager = (ViewPager) findViewById(R.id.viewpager);FragmentPagerAdapter mPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());mViewPager.setAdapter(mPagerAdapter);handler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case WHAT:int index = (Integer) msg.obj;mViewPager.setCurrentItem(index);break;}}};new Thread(new Runnable() {@Overridepublic void run() {int i = 0;while (true) {// 当超过SIZE后，回绕，从头开始循环。i = i % SIZE;Message message = new Message();message.what = WHAT;message.obj = i;handler.sendMessage(message);// 休息两秒。SystemClock.sleep(2000);i++;}}}).start();}private class MyFragmentPagerAdapter extends FragmentPagerAdapter {public MyFragmentPagerAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int pos) {return mArrayList.get(pos);}@Overridepublic int getCount() {return mArrayList.size();}}// 测试的Fragmnt，只显示一个Id，用于区别不同的Fragment。public static class TestFragment extends Fragment {private int Id;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Bundle b = this.getArguments();Id = b.getInt(ID);}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {TextView tv = new TextView(getActivity());String str = "id: " + Id;tv.setTextColor(Color.LTGRAY);tv.setText(str);tv.setTextSize(50);tv.setGravity(Gravity.CENTER);return tv;}}}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <FrameLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_weight="1" >        <android.support.v4.view.ViewPager            android:id="@+id/viewpager"            android:layout_width="match_parent"            android:layout_height="match_parent" />    </FrameLayout></LinearLayout>

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