很多App都有这种效果,特别一些电商类的App,顶部每隔几秒钟会向右翻页显示下张图片,用来作推广或者内容展示用的。今天来简单地模仿一下,还自带一个自动跳动的小功能(底部有几个小
很多App都有这种效果,特别一些电商类的App,顶部每隔几秒钟会向右翻页显示下张图片,用来作推广或者内容展示用的。今天来简单地模仿一下,还自带一个自动跳动的小功能(底部有几个小点,图片移动的时候,点的状态也在变化),用定时器来实现不难。
import java.util.ArrayList;
import java.util.List;
import Android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
public class MainActivity extends Activity implements OnPageChangeListener {
protected static final String TAG = "MainActivity";
private List<ImageView> imageViewList;
private ViewPager mViewPager;
private final int[] imageResIDs = {
R.drawable.a,
R.drawable.b,
R.drawable.c,
R.drawable.d,
R.drawable.e
};
private final String[] imageDescriptions = {
"巩俐不低俗,我就不能低俗",
"扑树又回来啦!再唱经典老歌引万人大合唱",
"揭秘北京电影如何升级",
"乐视网TV版大派送",
"热血屌丝的反杀"
};
private TextView tvImageDescription; // 图片描述
private LinearLayout llPointGroup; // 点控件的组
private int previousPosition = 0; // viewpager选中的前一个position
private boolean isStop = false; // 控制循环的子线程是否停止
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
new Thread(new Runnable() {
@Override
public void run() {
// 每两秒钟向主线程发送一条消息, 切换viewpager的界面
while(!isStop) {
SystemClock.sleep(2000);
handler.sendEmptyMessage(0);
}
Log.i(TAG, "循环线程停止了");
}}).start();
}
@Override
protected void onDestroy() {
isStop = true;
super.onDestroy();
}
private void initView() {
mViewPager = (ViewPager) findViewById(R.id.viewpager);
llPointGroup = (LinearLayout) findViewById(R.id.ll_point_group);
tvImageDescription = (TextView) findViewById(R.id.tv_image_description);
imageViewList = new ArrayList<ImageView>();
ImageView iv;
View pointView;
LayoutParams params;
for (int i = 0; i < imageResIDs.length; i++) {
iv = new ImageView(this);
iv.setBackgroundResource(imageResIDs[i]);
imageViewList.add(iv);
// 根据图片添加点
pointView = new View(this);
params = new LayoutParams(5, 5);
params.leftMargin = 5;
pointView.setLayoutParams(params);
pointView.setEnabled(false);
pointView.setBackgroundResource(R.drawable.point_bg);
llPointGroup.addView(pointView);
}
MyPagerAdapter mAdapter = new MyPagerAdapter();
mViewPager.setAdapter(mAdapter);
mViewPager.setOnPageChangeListener(this);
int item = (Integer.MAX_VALUE / 2) - ((Integer.MAX_VALUE / 2) % imageViewList.size());
mViewPager.setCurrentItem(item); // 设置当前选中的item的position
tvImageDescription.setText(imageDescriptions[previousPosition]);
llPointGroup.getChildAt(previousPosition).setEnabled(true); // 第一点被选中
}
class MyPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
// 移除掉指定position的对象
mViewPager.removeView(imageViewList.get(position % imageViewList.size()));
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
// 添加指定position的对象
mViewPager.addView(imageViewList.get(position % imageViewList.size()));
return imageViewList.get(position % imageViewList.size());
}
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageSelected(int position) {
tvImageDescription.setText(imageDescriptions[position % imageViewList.size()]);
llPointGroup.getChildAt(position % imageViewList.size()).setEnabled(true);
llPointGroup.getChildAt(previousPosition).setEnabled(false);
previousPosition = position % imageViewList.size();
}
}
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本文标题: Android ViewPager实现图片轮翻效果
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