自定义view—— 广告条效果

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效果图

布局activi_mian：

被选中的时候按钮:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<size
android:width="8dp"
android:height="8dp" />
<solid android:color="#ff0000"/>
</shape>

正常情况下圆点:

MainActivity主界面功能：

/**
* 广告条效果
*
* @author 周成东
*
*/

public class MainActivity extends Activity {
private ViewPager pager;
private TextView tv_title;
private LinearLayout ll_point;
private int[] ids = { R.drawable.a, R.drawable.b, R.drawable.c,
R.drawable. d, R.drawable. e };
Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what ) {
case 0:
int item = pager.getCurrentItem() + 1;
pager.setCurrentItem(item);
handler.sendEmptyMessageDelayed(0, 3000);
break;

default:
break;
}
};
};
/**
* 上一次高亮显示的位置
*/
private int prePosition = 0;
private List<ImageView> imageViews = new ArrayList<ImageView>();
// 图片标题集合
private final String[] imageDescriptions = { "尚硅谷波河争霸赛！" , "凝聚你我，放飞梦想！" ,
"抱歉没座位了！" , "7月就业名单全部曝光！" , "平均起薪11345元" };

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout. activity_main);
initView();
getData();
setListener();

pager.setAdapter( new PagerAdapter() {
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
// TODO Auto-generated method stub
return arg0 == arg1;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return Integer.MAX_VALUE ;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
final int relposition = position % imageViews.size();
final ImageView imageView = imageViews.get(relposition);
container.addView(imageView);
// imageview 触摸事件
imageView.setOnTouchListener( new OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {
// 不会调用MotionEvent.ACTION_MOVE
if (event.getAction() == MotionEvent.ACTION_DOWN ) {
handler.removeCallbacksAndMessages( null);
} else if (event.getAction() == MotionEvent.ACTION_UP ) {
handler.removeCallbacksAndMessages( null);
handler.sendEmptyMessageDelayed(0, 3000);
}
return false ;
}
});
//就是当多个ImageView用到一个监听器时，能触发不同的情况
imageView.setTag(relposition);
imageView.setOnClickListener( new OnClickListener() {

@Override
public void onClick(View v) {
int position=(Integer) imageView.getTag();
String text=imageDescriptions[position];
Toast. makeText(getApplicationContext(), text, Toast.LENGTH_LONG ).show();
}
});
return imageView;
}

@Override
public void destroyItem(ViewGroup container, int position,
Object object) {
container.removeView((View) object);
}

});
// 设置中间位置
int item = Integer.MAX_VALUE / 2 - Integer.MAX_VALUE / 2
% imageViews.size();
pager.setCurrentItem(item);
handler.sendEmptyMessageDelayed(0, 3000);
}

private void setListener() {
pager.setOnPageChangeListener( new OnPageChangeListener() {

private boolean isDragging ;

@Override
public void onPageSelected(int position) {
//进行循环,真实的位置
int relposition = position % imageViews.size();
tv_title.setText( imageDescriptions[relposition]);
// 设置前一个为灰点
ll_point.getChildAt( prePosition).setEnabled(false);
ll_point.getChildAt(relposition).setEnabled( true);
prePosition = relposition;

}

@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
@Override
public void onPageScrollStateChanged(int state) {
if (state == ViewPager.SCROLL_STATE_DRAGGING ) {
handler.removeCallbacksAndMessages( null);
isDragging = true ;
} else if (state == ViewPager.SCROLL_STATE_SETTLING ) {

} else if (state == ViewPager.SCROLL_STATE_IDLE && isDragging) {
isDragging = false ;
handler.removeCallbacksAndMessages( null);
handler.sendEmptyMessageDelayed(0, 3000);
}

}
});
}

private void getData() {
for (int i = 0; i < ids.length; i++) {
/**
* 设置图片
*/
ImageView imageView = new ImageView(this);
imageView.setBackgroundResource( ids[i]);
imageViews.add(imageView);
/**
* 获取点
*/
ImageView point = new ImageView(this);
point.setBackgroundResource(R.drawable. point_selector);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(8,
8);
if (i == 0) {
point.setEnabled( true);
} else {
point.setEnabled( false);
params. leftMargin = 8;
}
point.setLayoutParams(params);
ll_point.addView(point);
}

}

private void initView() {
pager = (ViewPager) findViewById(R.id.viewpager );
tv_title = (TextView) findViewById(R.id.tv_title );
ll_point = (LinearLayout) findViewById(R.id.ll_point );
}

}

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