這篇文章主要介紹Android如何自定義Banner輪播效果，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
具體內容如下
自定義View布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content"> <android.support.v4.view.ViewPager android:id="@+id/banner_view_pager" android:layout_width="match_parent" android:layout_height="200dp"> </android.support.v4.view.ViewPager> <LinearLayout android:id="@+id/linear_bannner" android:layout_centerHorizontal="true" android:layout_alignBottom="@+id/banner_view_pager" android:layout_marginBottom="10dp" android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> </LinearLayout> </RelativeLayout>
自定義View主體內容
public class CustomBanner extends FrameLayout {
@BindView(R.id.banner_view_pager)
ViewPager bannerViewPager;
@BindView(R.id.linear_bannner)
LinearLayout linearBannner;
private List<String> list;
private int time = 2;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0) {
int currentItem = bannerViewPager.getCurrentItem();
bannerViewPager.setCurrentItem(currentItem + 1);
//再次發送
sendEmptyMessageDelayed(0, time * 1000);
}
}
};
private List<ImageView> listDoc;
private OnClickLisner onClickLisner;
public CustomBanner(@NonNull Context context) {
super(context);
init();
}
public CustomBanner(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public CustomBanner(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
/**
* 初始化
*/
private void init() {
View view = View.inflate(getContext(), R.layout.bannner_layout, this);
ButterKnife.bind(this, view);
}
/**
* 對外提供設置image路徑的方法
*/
public void setImageUrls(List<String> list) {
this.list = list;
if (list == null) {
return;
}
//設置適配器
LunBoAdapter lunBoAdapter = new LunBoAdapter(getContext(), list);
bannerViewPager.setAdapter(lunBoAdapter);
initDoc();
//顯示中間某個位置
bannerViewPager.setCurrentItem(list.size() * 10000);
//使用handler自動輪播
handler.sendEmptyMessageDelayed(0, time * 1000);
//狀態改變的監聽事件
bannerViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
//在選中某一頁的時候,切換小圓點的背景
for (int i = 0; i < listDoc.size(); i++) {
if (position % listDoc.size() == i) {
listDoc.get(i).setBackgroundResource(R.drawable.shape_01);
} else {
listDoc.get(i).setBackgroundResource(R.drawable.shape_02);
}
}
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
/**
* 初始化小圓點
*/
private void initDoc() {
//創建一個集合,記錄這些小圓點
listDoc = new ArrayList<>();
//清空布局
linearBannner.removeAllViews();
for (int i = 0; i < list.size(); i++) {
ImageView docImage = new ImageView(getContext());
if (i == 0) {
docImage.setBackgroundResource(R.drawable.shape_01);
} else {
docImage.setBackgroundResource(R.drawable.shape_02);
}
//添加到集合
listDoc.add(docImage);
//添加到線性布局
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
params.setMargins(5, 0, 5, 0);
linearBannner.addView(docImage, params);
}
}
/**
* 對外提供輪播的時間
*/
public void setTimeSecond(int time) {
this.time = time;
}
/**
* 點擊事件
*
* @param onClickLisner
*/
public void setClickListner(OnClickLisner onClickLisner) {
this.onClickLisner = onClickLisner;
}
private class LunBoAdapter extends PagerAdapter {
private List<String> list;
private Context context;
public LunBoAdapter(Context context, List<String> list) {
this.context = context;
this.list = list;
}
@Override
public int getCount() {
return Integer.MAX_VALUE;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public Object instantiateItem(ViewGroup container, final int position) {
//創建imageView
ImageView imageView = new ImageView(context);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
//加載這張圖片
Glide.with(context).load(list.get(position % list.size())).into(imageView);
//點擊事件
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
//觸發
onClickLisner.onItemClick(position % list.size());
}
});
//觸摸事件
imageView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_DOWN:
//取消handler身上的消息和回調
handler.removeCallbacksAndMessages(null);
break;
case MotionEvent.ACTION_MOVE:
handler.removeCallbacksAndMessages(null);
break;
case MotionEvent.ACTION_CANCEL:
handler.sendEmptyMessageDelayed(0, time * 1000);
break;
case MotionEvent.ACTION_UP:
handler.sendEmptyMessageDelayed(0, time * 1000);
break;
}
return false;
}
});
//添加到容器
container.addView(imageView);
//返回
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
}
public interface OnClickLisner {
void onItemClick(int position);
}
}自定義小圓點
public class CountView extends View implements View.OnClickListener {
private int count = 0;
public CountView(Context context) {
super(context);
init();
}
public CountView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init();
}
public CountView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
//初始化的方法
private void init() {
this.setOnClickListener(this);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
//圓
canvas.drawCircle(300,300,200,paint);
paint.setColor(Color.BLACK);
paint.setTextSize(100);
String text = String.valueOf(count);
//拿到文本的寬度和高度
Rect rect = new Rect();
paint.getTextBounds(text,0,text.length(),rect);
canvas.drawText(text,300-rect.width()/2,300+rect.height()/2,paint);
}
@Override
public void onClick(View view) {
count ++;
//重新繪制
postInvalidate();
}
}小圓點shape
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="#00ff00"/> <corners android:radius="10dp"/> <size android:height="10dp" android:width="10dp"/> </shape> <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <solid android:color="#ff0000"/> <corners android:radius="10dp"/> <size android:height="10dp" android:width="10dp"/> </shape>
在Main中運行
public class MainActivity extends AppCompatActivity {
private CustomBanner customBanner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customBanner = findViewById(R.id.custom_banner);
getDataFromNet();
}
private void getDataFromNet() {
OkHttpUtil.doGet("https://www.zhaoapi.cn/ad/getAd", new Callback() {
private List<String> list;
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
if (response.isSuccessful()){
String json = response.body().string();
final HomeBean detalBean = new Gson().fromJson(json,HomeBean.class);
list = new ArrayList<>();
List<HomeBean.DataBean> data = detalBean.getData();
for (int i = 0; i < data.size(); i++) {
String icon = data.get(i).getIcon();
list.add(icon);
}
runOnUiThread(new Runnable() {
@Override
public void run() {
//設置時間
customBanner.setTimeSecond(5);
//設置顯示輪播
customBanner.setImageUrls(list);
//banner的點擊跳轉詳情頁面的事件
banner.setOnBannerListener(new OnBannerListener() {
@Override
public void OnBannerClick(int position) {
List<ShouBean.DataBean> datab = shouBean.getData();
if (datab.get(position).getType() == 0) {
Intent intent = new Intent(getActivity(), WebViewActivity.class);
intent.putExtra("databurl", datab.get(position).getUrl());
startActivity(intent);
} else {
Toast.makeText(getContext(), "即將跳轉到商品詳情頁面", Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
}
});
}
}WebView頁面
public class WebViewActivity extends AppCompatActivity {
private WebView web_view;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_view);
web_view = findViewById(R.id.web_view);
String databurl = getIntent().getStringExtra("databurl");
web_view.loadUrl(databurl);
//webview一系列設置
web_view.setWebViewClient(new WebViewClient());//在當前應用打開,而不是去瀏覽器
WebSettings settings = web_view.getSettings();
settings.setJavaScriptEnabled(true);
settings.setJavaScriptCanOpenWindowsAutomatically(true);
}
}以上是“Android如何自定義Banner輪播效果”這篇文章的所有內容，感謝各位的閱讀！希望分享的內容對大家有幫助，更多相關知識，歡迎關注億速云行業資訊頻道！
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