Android自定义Banner轮播效果

2023-09-14 03:56:05 300

本文实例为大家分享了Android自定义Banner轮播效果展示的具体代码，供大家参考，具体内容如下

自定义View布局

自定义View主体内容

publicclassCustomBannerextendsFrameLayout{

@BindView(R.id.banner_view_pager)
ViewPagerbannerViewPager;
@BindView(R.id.linear_bannner)
LinearLayoutlinearBannner;
privateListlist;
privateinttime=2;

privateHandlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
if(msg.what==0){

intcurrentItem=bannerViewPager.getCurrentItem();

bannerViewPager.setCurrentItem(currentItem+1);

//再次发送
sendEmptyMessageDelayed(0,time*1000);

}
}
};
privateListlistDoc;
privateOnClickLisneronClickLisner;

publicCustomBanner(@NonNullContextcontext){
super(context);
init();
}

publicCustomBanner(@NonNullContextcontext,@NullableAttributeSetattrs){
super(context,attrs);
init();
}

publicCustomBanner(@NonNullContextcontext,@NullableAttributeSetattrs,intdefStyleAttr){
super(context,attrs,defStyleAttr);
init();
}

/**
*初始化
*/
privatevoidinit(){

Viewview=View.inflate(getContext(),R.layout.bannner_layout,this);
ButterKnife.bind(this,view);

}

/**
*对外提供设置image路径的方法
*/
publicvoidsetImageUrls(Listlist){
this.list=list;

if(list==null){
return;
}

//设置适配器
LunBoAdapterlunBoAdapter=newLunBoAdapter(getContext(),list);
bannerViewPager.setAdapter(lunBoAdapter);

initDoc();

//显示中间某个位置
bannerViewPager.setCurrentItem(list.size()*10000);

//使用handler自动轮播
handler.sendEmptyMessageDelayed(0,time*1000);

//状态改变的监听事件
bannerViewPager.addOnPageChangeListener(newViewPager.OnPageChangeListener(){
@Override
publicvoidonPageScrolled(intposition,floatpositionOffset,intpositionOffsetPixels){

}

@Override
publicvoidonPageSelected(intposition){
//在选中某一页的时候,切换小圆点的背景
for(inti=0;i();
//清空布局
linearBannner.removeAllViews();

for(inti=0;ilist;
privateContextcontext;

publicLunBoAdapter(Contextcontext,Listlist){
this.context=context;
this.list=list;
}

@Override
publicintgetCount(){
returnInteger.MAX_VALUE;
}

@Override
publicbooleanisViewFromObject(Viewview,Objectobject){
returnview==object;
}

@Override
publicObjectinstantiateItem(ViewGroupcontainer,finalintposition){

//创建imageView
ImageViewimageView=newImageView(context);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
//加载这张图片
Glide.with(context).load(list.get(position%list.size())).into(imageView);


//点击事件
imageView.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewview){
//触发
onClickLisner.onItemClick(position%list.size());
}
});

//触摸事件
imageView.setOnTouchListener(newOnTouchListener(){
@Override
publicbooleanonTouch(Viewview,MotionEventmotionEvent){

switch(motionEvent.getAction()){
caseMotionEvent.ACTION_DOWN:
//取消handler身上的消息和回调
handler.removeCallbacksAndMessages(null);

break;
caseMotionEvent.ACTION_MOVE:
handler.removeCallbacksAndMessages(null);
break;
caseMotionEvent.ACTION_CANCEL:
handler.sendEmptyMessageDelayed(0,time*1000);
break;
caseMotionEvent.ACTION_UP:
handler.sendEmptyMessageDelayed(0,time*1000);
break;
}

returnfalse;
}
});

//添加到容器
container.addView(imageView);

//返回

returnimageView;
}

@Override
publicvoiddestroyItem(ViewGroupcontainer,intposition,Objectobject){

container.removeView((View)object);
}
}

publicinterfaceOnClickLisner{
voidonItemClick(intposition);
}
}

自定义小圆点

publicclassCountViewextendsViewimplementsView.OnClickListener{

privateintcount=0;

publicCountView(Contextcontext){
super(context);
init();
}


publicCountView(Contextcontext,@NullableAttributeSetattrs){
super(context,attrs);
init();
}

publicCountView(Contextcontext,@NullableAttributeSetattrs,intdefStyleAttr){
super(context,attrs,defStyleAttr);
init();
}

//初始化的方法
privatevoidinit(){

this.setOnClickListener(this);
}

@Override
protectedvoidonDraw(Canvascanvas){
super.onDraw(canvas);

Paintpaint=newPaint();
paint.setColor(Color.RED);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);

//圆
canvas.drawCircle(300,300,200,paint);


paint.setColor(Color.BLACK);
paint.setTextSize(100);

Stringtext=String.valueOf(count);

//拿到文本的宽度和高度
Rectrect=newRect();
paint.getTextBounds(text,0,text.length(),rect);

canvas.drawText(text,300-rect.width()/2,300+rect.height()/2,paint);

}

@Override
publicvoidonClick(Viewview){
count++;

//重新绘制
postInvalidate();
}
}

小圆点shape

在Main中运行

publicclassMainActivityextendsAppCompatActivity{

privateCustomBannercustomBanner;

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

customBanner=findViewById(R.id.custom_banner);

getDataFromNet();
}

privatevoidgetDataFromNet(){

OkHttpUtil.doGet("https://www.zhaoapi.cn/ad/getAd",newCallback(){

privateListlist;

@Override
publicvoidonFailure(Callcall,IOExceptione){

}

@Override
publicvoidonResponse(Callcall,Responseresponse)throwsIOException{
if(response.isSuccessful()){
Stringjson=response.body().string();

finalHomeBeandetalBean=newGson().fromJson(json,HomeBean.class);

list=newArrayList<>();
Listdata=detalBean.getData();

for(inti=0;idatab=shouBean.getData();

if(datab.get(position).getType()==0){
Intentintent=newIntent(getActivity(),WebViewActivity.class);
intent.putExtra("databurl",datab.get(position).getUrl());
startActivity(intent);
}else{
Toast.makeText(getContext(),"即将跳转到商品详情页面",Toast.LENGTH_SHORT).show();
}
}
});

}
});

}
}
});

}
}

WebView页面

publicclassWebViewActivityextendsAppCompatActivity{

privateWebViewweb_view;

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_view);

web_view=findViewById(R.id.web_view);

Stringdataburl=getIntent().getStringExtra("databurl");

web_view.loadUrl(databurl);

//webview一系列设置
web_view.setWebViewClient(newWebViewClient());//在当前应用打开,而不是去浏览器
WebSettingssettings=web_view.getSettings();
settings.setJavaScriptEnabled(true);
settings.setJavaScriptCanOpenWindowsAutomatically(true);
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

Android自定义Banner轮播效果

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