这篇文章主要为大家详细介绍了利用MVC编写广告条轮播效果，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
我理解的安卓中MVC思想是利用Holder进行编程,展示布局,提供视图,将视图和数据进行绑定起来,在很多App中我们能见到广告条,广告条这里我们可以使用FramLayout进行填充，然后利用MVC的思想将提供的布局添加到FrameLayout中即可; 广告条的实现也可以利用Banner等开源框架等,这里就不列举了,感兴趣的朋友可以去搜下
当然由于我这里的项目的图片是设计师那边提供好的,并不是从网上获取的,所以我这里就直接写了ViewPager来进行填充了
<!--轮播图-->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="328px">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/fragment_work_pic_viewpager"/>
<!-- 指针容器 -->
<RelativeLayout
android:background="@android:color/transparent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp"
android:layout_alignBottom="@id/fragment_work_pic_viewpager">
<!--<TextView
android:textSize="12sp"
android:layout_gravity="left"
android:layout_marginLeft="5dp"
android:id="@+id/tv_desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@android:color/white"
android:text="图片的描述"/>-->
<LinearLayout
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:id="@+id/ll_dots"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout>
</RelativeLayout>
逻辑:
package com.hanzheng.znxl.fragment;
import android.support.v4.view.ViewPager;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import com.hanzheng.znxl.R;
import com.hanzheng.znxl.adapter.OnPagerChangeListenerImp;
import com.hanzheng.znxl.adapter.WorkFragmentBannerAdapter;
import com.hanzheng.znxl.base.BaseFragment;
import com.hanzheng.znxl.base.MyApplication;
import com.hanzheng.znxl.utils.ToastUtil;
import butterknife.Bind;
import butterknife.ButterKnife;
import butterknife.OnClick;
/**
* Created by zmybi on 29/12/2016.
*/
public class WorkFragment extends BaseFragment {
@Bind(R.id.fragment_work_pic_viewpager)
ViewPager mFragmentWorkPicViewpager;
@Bind(R.id.ll_dots)
LinearLayout mLLDots;
// @Bind(R.id.tv_desc)
// TextView mTvDesc;
@Bind(R.id.ll_kaoqing)
LinearLayout mLlKaoqing;
@Bind(R.id.ll_execute)
LinearLayout mLlExecute;
@Bind(R.id.ll_daohang)
LinearLayout mLlDaohang;
@Bind(R.id.ll_sudden)
LinearLayout mLlSudden;
@Bind(R.id.ll_policething)
LinearLayout mLlPolicething;
@Bind(R.id.ll_collect)
LinearLayout mLlCollect;
@Bind(R.id.ll_search)
LinearLayout mLlSearch;
@Bind(R.id.ll_noticevoice)
LinearLayout mLlNoticevoice;
@Bind(R.id.iv_book)
ImageView mIvBook;
@Bind(R.id.rl_shouce)
RelativeLayout mRlShouce;
@Bind(R.id.ibtn_yuan)
ImageView mIbtnYuan;
@Bind(R.id.ibtn_helpbook)
ImageView mIbtnHelpbook;
private int[] imageResIds = {R.drawable.banner1,R.drawable.banner2};
private String[] descs = {"武汉保安集团","智能巡逻系统"};
private AutoScrollTask mAutoScrollTask;
@Override
public void initData() {
mFragmentWorkPicViewpager.addOnPageChangeListener(new OnPagerChangeListenerImp() {
@Override
public void onPageSelected(int position) {
changeDotAndDesc(position);
}
});
mFragmentWorkPicViewpager.setAdapter(new WorkFragmentBannerAdapter(imageResIds));
initDot();
changeDotAndDesc(0); //默认选择第一页
mFragmentWorkPicViewpager.setCurrentItem(mFragmentWorkPicViewpager.getAdapter().getCount() / 2);
if(mAutoScrollTask == null) {
mAutoScrollTask = new AutoScrollTask();
mAutoScrollTask.start();
}
//按下去停止轮播
mFragmentWorkPicViewpager.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
mAutoScrollTask.stop();
break;
case MotionEvent.ACTION_UP:
mAutoScrollTask.start();
break;
}
return false;
}
});
}
private void changeDotAndDesc(int position) {
position = position % imageResIds.length;
// mTvDesc.setText(descs[position]);
for(int i = 0; i < mLLDots.getChildCount();i++) {
ImageView iv_dot = (ImageView) mLLDots.getChildAt(i);
iv_dot.setSelected(false);
if(position == i) {
iv_dot.setSelected(true);
}
}
}
private void initDot() {
for(int i = 0; i < imageResIds.length;i++) {
int _5dp = dp2px(5);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(_5dp,_5dp);
params.leftMargin = _5dp;
ImageView dot = new ImageView(mActivity);
dot.setLayoutParams(params);
dot.setBackgroundResource(R.drawable.selector_dot);
mLLDots.addView(dot);
}
}
public int dp2px(int dp) {
float density = getResources().getDisplayMetrics().density;
return (int) (dp * density + .5f);
}
@Override
public View initView() {
// TODO: inflate a fragment view
View rootView = View.inflate(mActivity,R.layout.fragment_work,null);
ButterKnife.bind(this, rootView);
return rootView;
}
@Override
public void onDestroyView() {
super.onDestroyView();
ButterKnife.unbind(this);
}
@OnClick({R.id.rl_shouce,R.id.ibtn_yuan, R.id.ibtn_helpbook,R.id.ll_kaoqing, R.id.ll_execute, R.id.ll_daohang, R.id.ll_sudden, R.id.ll_policething, R.id.ll_collect, R.id.ll_search, R.id.ll_noticevoice})
public void onClick(View view) {
switch (view.getId()) {
case R.id.ll_kaoqing:
ToastUtil.showToast(mActivity,"考勤");
break;
case R.id.ll_execute:
ToastUtil.showToast(mActivity,"勤务");
break;
case R.id.ll_daohang:
ToastUtil.showToast(mActivity,"网店");
break;
case R.id.ll_sudden:
ToastUtil.showToast(mActivity,"突发");
break;
case R.id.ll_policething:
ToastUtil.showToast(mActivity,"警情");
break;
case R.id.ll_collect:
ToastUtil.showToast(mActivity,"认证");
break;
case R.id.ll_search:
ToastUtil.showToast(mActivity,"信息查询");
break;
case R.id.ll_noticevoice:
ToastUtil.showToast(mActivity,"发布公告");
break;
case R.id.rl_shouce:
ToastUtil.showToast(mActivity,"手册");
break;
case R.id.ibtn_yuan:
ToastUtil.showToast(mActivity,"预案流程");
break;
case R.id.ibtn_helpbook:
ToastUtil.showToast(mActivity,"帮助手册");
break;
}
}
private class AutoScrollTask implements Runnable{
public void start() {
stop();
MyApplication.getMainThreadHandler().postDelayed(this,2000);
}
public void stop() {
MyApplication.getMainThreadHandler().removeCallbacks(this);
}
@Override
public void run() {
int currentItem = mFragmentWorkPicViewpager.getCurrentItem();
currentItem++;
mFragmentWorkPicViewpager.setCurrentItem(currentItem);
start();
}
}
}
这里轮播图下方的指示器(小点)或者图片描述都是可以加上的, 具体依据公司美工的要求即可
做了个按下去停止轮播的优化; 给viewpager设计点击监听,重写三个方法, 抬起则start(), 走run方法viewpager跳到下一页,并走AutoScrollTask中的start(),方法,主线程的Handler发送延时消息,则继续循环run方法, 实现轮播图的无线循环
对了,说下轮播图的PagerAdapter的写法
package com.hanzheng.znxl.adapter;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
/**
* Created by zmybi on 31/12/2016.
*/
public class WorkFragmentBannerAdapter extends PagerAdapter {
private int[] imageResIds;
public WorkFragmentBannerAdapter(int[] imageResIds) {
this.imageResIds = imageResIds;
}
@Override
public int getCount() {
return imageResIds.length * 1000000;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView iv = new ImageView(container.getContext());
position = position % imageResIds.length;
iv.setBackgroundResource(imageResIds[position]);
iv.setScaleType(ImageView.ScaleType.FIT_XY);
container.addView(iv);
return iv;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((ImageView)object);
}
}
这里返回一个很大的数,其实也没必要返回Integer.MAX_VALUE; 因为这样写的话还要对余数进行判断,让下方的Indicator和上方的图片切换保持一致, 当然,这里由于美工直接给的图,所以我直接放在工程下了,实际如果是从网上获取的,则使用Picasso或者Glide图片加载框架即可
至此,一个简单的图片轮播功能就已经实现了。
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