前一段时间要实现一个滚动的广告条，参考了一下网上许多实现，发现实现都很麻烦，所以我决定自己使用ViewFlipper来实现一个，在此将代码贴出来，与大家共享。
转载请说明出处：http://blog.csdn.net/dawanganban
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask; import com.guozha.buy.R;
import com.guozha.buy.util.DimenUtil; import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.ViewFlipper; /**
* 自定播放图片View
* @author lixiaoqiang
*
* CSDN博客：http://blog.csdn.net/dawanganban
*
*/
public class AutoViewFlipper extends FrameLayout{
private static final int SLOP_DELAY_TIME = 3000; //滑动等待时间，单位ms
private ViewFlipper mViewFlipper; //滑动的视图
private View mPointBar; //指示点显示条
private int mItemCount; //条目数
private int mCurrentItem; //当前的条目
private int mTouchSlop; //有效最短滑动距离
private Context context;
private List<ImageView> points = new ArrayList<ImageView>(); private TimerTask mTimerTask; private static final int HANDLER_SLOP_LEFT = 0x0001;
private Handler hander = new Handler(){
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case HANDLER_SLOP_LEFT:
slopToLeft();
break;
}
};
}; public AutoViewFlipper(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context; mTouchSlop = ViewConfiguration.getTouchSlop(); addChild(context); startAutoPlay();
} /**
* 停止自动播放
*/
public void stopAutoPlay(){
if(mTimerTask == null) return;
mTimerTask.cancel();
mTimerTask = null;
} /**
* 开始自动播放
*/
public void startAutoPlay(){
if(mTimerTask != null) return;
mTimerTask = new TimerTask() {
@Override
public void run() {
hander.sendEmptyMessage(HANDLER_SLOP_LEFT);
}
};
new Timer().scheduleAtFixedRate(mTimerTask, SLOP_DELAY_TIME, SLOP_DELAY_TIME);
} /**
* 添加子视图
* @param context
*/
private void addChild(Context context){ mViewFlipper = getViewFlipper(context);
this.addView(mViewFlipper); mPointBar = getPointBar(context);
this.addView(mPointBar);
} /**
* 获取ViewFlipper
* @param context
* @return
*/
private ViewFlipper getViewFlipper(Context context){
ViewFlipper viewFlipper = new ViewFlipper(context);
addImageViews(context, viewFlipper);
return viewFlipper;
} /**
* 获取指示点显示条
* @param context
* @return
*/
private View getPointBar(Context context){
LinearLayout.LayoutParams pointBarParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
pointBarParams.gravity = Gravity.RIGHT | Gravity.BOTTOM;
LinearLayout pointBar = new LinearLayout(context); pointBar.setOrientation(LinearLayout.HORIZONTAL);
pointBar.setLayoutParams(pointBarParams);
pointBar.setGravity(Gravity.RIGHT | Gravity.BOTTOM); addPoints(context, pointBar);
return pointBar;
} /**
* 添加小圆点
* @param context
* @param pointBar
*/
private void addPoints(Context context, LinearLayout pointBar){
LinearLayout.LayoutParams pointViewParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
pointViewParams.setMargins(DimenUtil.dp2px(context, 8), 0,
DimenUtil.dp2px(context, 8), DimenUtil.dp2px(context, 8)); ImageView pointView;
for(int i = 0; i < mItemCount; i++){
pointView = new ImageView(context);
pointView.setScaleType(ScaleType.CENTER_INSIDE);
pointView.setLayoutParams(pointViewParams);
points.add(pointView);
pointBar.addView(pointView);
}
setPointColorByCurrentItem();
} /**
* 根据当前选中项来设置圆点
*/
private void setPointColorByCurrentItem(){
mCurrentItem = (Integer)mViewFlipper.getCurrentView().getTag();
Bitmap grayPointBitmap = getGrayPointBitmap(context);
Bitmap lightPointBitmap = getLightPointBitmap(context);
ImageView imageView;
for(int i = 0; i < points.size(); i++){
imageView = points.get(i);
if(mCurrentItem == i){
imageView.setImageBitmap(lightPointBitmap);
}else{
imageView.setImageBitmap(grayPointBitmap);
} }
} /**
* 添加图片资源
* @param context
* @param viewFlipper
*/
private void addImageViews(Context context, ViewFlipper viewFlipper){
if(viewFlipper == null) return;
List<Bitmap> bitmaps = getBitmaps(); if(bitmaps == null) return;
LinearLayout.LayoutParams imageViewParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT); ImageView imageView;
mItemCount = bitmaps.size();
for(int i = 0; i < mItemCount; i++){
imageView = new ImageView(context);
imageView.setImageBitmap(bitmaps.get(i));
imageView.setScaleType(ScaleType.CENTER_CROP);
imageView.setLayoutParams(imageViewParams);
imageView.setTag(i);
viewFlipper.addView(imageView);
}
} /**
* 获取图片资源
* @return
*/
private List<Bitmap> getBitmaps(){
//TODO 从网络获取图片
List<Bitmap> bitmaps = new ArrayList<Bitmap>(); bitmaps.add(BitmapFactory.decodeResource(
getResources(), R.drawable.main_page_scroll_image1));
bitmaps.add(BitmapFactory.decodeResource(
getResources(), R.drawable.main_page_scroll_image2));
bitmaps.add(BitmapFactory.decodeResource(
getResources(), R.drawable.main_page_scroll_image3)); return bitmaps;
} /**
* 获取选择圆点图片
* @param context
* @return
*/
private Bitmap getLightPointBitmap(Context context){
return BitmapFactory.decodeResource(
getResources(), R.drawable.main_page_scorll_point_selected);
} /**
* 获取灰色圆点图片
* @param context
* @return
*/
private Bitmap getGrayPointBitmap(Context context){
return BitmapFactory.decodeResource(
getResources(), R.drawable.main_page_scroll_point_unselected);
} private float mDownX;
@Override
public boolean onTouchEvent(MotionEvent event) {
float eventX = event.getX(); switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mDownX = eventX;
break;
case MotionEvent.ACTION_UP: float gap = eventX - mDownX;
if(Math.abs(gap) > mTouchSlop){
if(gap > 0){
//向右滑动
slopToRight();
}else{
//向左滑动
slopToLeft();
}
}
break;
} return true;
} /**
* 向右滑动
*/
private void slopToRight(){
mViewFlipper.setInAnimation(context, R.anim.slide_in_left);
mViewFlipper.setOutAnimation(context, R.anim.slide_out_right);
mViewFlipper.showPrevious();
setPointColorByCurrentItem();
} /**
* 向左滑动
*/
private void slopToLeft(){
mViewFlipper.setInAnimation(context, R.anim.slide_in_right);
mViewFlipper.setOutAnimation(context, R.anim.slide_out_left);
mViewFlipper.showNext();
setPointColorByCurrentItem();
} private OnSlopTouchListener mOnSlopTouchListener; /**
* 监听滑动等事件
* @author Administrator
*
*/
interface OnSlopTouchListener{ /**
* touch事件响应
*/
public void onTouchedView();
} /**
* 设置滑动等事件的监听
* @param onSlopTouchListener
*/
public void setOnSlopTouchListener(OnSlopTouchListener onSlopTouchListener){
this.mOnSlopTouchListener = onSlopTouchListener;
}
}