package com.bwei.viewpager;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
public class MainActivity extends Activity {
protected static final String TAG = "MainActivity";
// 數據源
private int[] ids = { R.drawable.a, R.drawable.b, R.drawable.c,
R.drawable.d, R.drawable.e };
// 集合ImageView
private List<ImageView> images = new ArrayList<ImageView>();
private ViewPager vp;
//創建Handler
private Handler handler = new Handler();
private MyViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 找控件
vp = (ViewPager) findViewById(R.id.vp);
// 獲取數據源
for (int id : ids) {
ImageView imageView = new ImageView(this);
imageView.setBackgroundResource(id);
images.add(imageView);
}
//設置適配器
viewPager = new MyViewPager();
vp.setAdapter(viewPager);
}
private class MyViewPager extends PagerAdapter {
// 獲取個數
@Override
public int getCount() {
// TODO Auto-generated method stub
//return images.size();
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}
//獲取viewpager中的子view Item
@Override
public Object instantiateItem(ViewGroup container, int position) {
// TODO Auto-generated method stub
//position%集合.size
position %= images.size();
ImageView imageView = images.get(position);
vp.addView(imageView);
return imageView;
}
//銷燬viewpager中子view
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// TODO Auto-generated method stub
//super.destroyItem(container, position, object);
vp.removeView((View) object);
}
}
//開始輪播
private void startSwitch(){
//handler發送延遲消息
handler.postDelayed(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
//獲取當前item
int currentItem = vp.getCurrentItem();
Log.i(TAG, "currentItem:"+currentItem);
//判斷是否是最後一個
/*if(currentItem==viewPager.getCount()-1){
vp.setCurrentItem(0);
}else {
currentItem++;
vp.setCurrentItem(currentItem);
}*/
//循環 播放下一個
currentItem++;
vp.setCurrentItem(currentItem);
handler.postDelayed(this, 1000);
}
}, 1000);
}
private void stopSwitch(){
handler.removeCallbacksAndMessages(null);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
startSwitch();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
stopSwitch();
}
}
xml的佈局
<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.support.v4.view.ViewPager
android:id="@+id/vp"
android:layout_width="match_parent"
android:layout_height="match_parent"
></android.support.v4.view.ViewPager>
</RelativeLayout>