公告信息自动轮播，箭头指示

app/build.gradle

@@ -20,7 +20,7 @@ android {
 
     defaultConfig {
         applicationId "com.community.pocket"
-        minSdkVersion 17
+        minSdkVersion 19
         targetSdkVersion 29
         versionCode 1
         versionName "1.0"
@@ -28,6 +28,14 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
         vectorDrawables.useSupportLibrary = true
+
+        compileOptions {
+
+            sourceCompatibility JavaVersion.VERSION_1_8
+
+           targetCompatibility JavaVersion.VERSION_1_8
+
+        }
     }
 
     buildTypes {
@@ -109,4 +117,6 @@ dependencies {
 
     // Test helpers
     testImplementation "androidx.room:room-testing:$room_version"
+
+    implementation 'com.youth.banner:banner:2.0.7'
 }

app/src/main/java/com/community/pocket/data/adapter/NoticeAdpter.java

@@ -12,6 +12,7 @@ import androidx.recyclerview.widget.RecyclerView;
 
 import com.community.pocket.R;
 import com.community.pocket.data.model.Notice;
+import com.youth.banner.adapter.BannerAdapter;
 
 import java.util.Date;
 import java.util.List;
@@ -20,25 +21,20 @@ import java.util.List;
  * 公告内容
  * TODO 实现无限循环自动滚动
  */
-public class NoticeAdpter extends RecyclerView.Adapter<NoticeAdpter.PagerViewHolder> {
+public class NoticeAdpter extends BannerAdapter<Notice, NoticeAdpter.PagerViewHolder> {
 
-    private List<Notice> noticeList;
-
-    public NoticeAdpter(List<Notice> noticeList) {
-        this.noticeList = noticeList;
+    public NoticeAdpter(List<Notice> datas) {
+        super(datas);
     }
 
-    @NonNull
     @Override
-    public PagerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-
+    public PagerViewHolder onCreateHolder(ViewGroup parent, int viewType) {
         View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.forum_notice, parent, false);
         return new PagerViewHolder(itemView);
     }
 
     @Override
-    public void onBindViewHolder(@NonNull PagerViewHolder holder, int position) {
-        Notice notice = noticeList.get(position);
+    public void onBindView(PagerViewHolder holder, Notice notice, int position, int size) {
         //设置数据源
         holder.title.setText(notice.getTitle());
         holder.content.setText(notice.getContent());
@@ -49,13 +45,8 @@ public class NoticeAdpter extends RecyclerView.Adapter<NoticeAdpter.PagerViewHol
         holder.time.setText(context.getString(R.string.notice_time, DateFormat.format(context.getString(R.string.dateformat), date)));
     }
 
-    @Override
-    public int getItemCount() {
-        return noticeList.size();
-    }
-
     //	ViewHolder需要继承RecycleView.ViewHolder
-    static class PagerViewHolder extends RecyclerView.ViewHolder {
+    class PagerViewHolder extends RecyclerView.ViewHolder {
 
         //公告标题
         private TextView title;
@@ -74,6 +65,7 @@ public class NoticeAdpter extends RecyclerView.Adapter<NoticeAdpter.PagerViewHol
             author = itemView.findViewById(R.id.notice_author);
             time = itemView.findViewById(R.id.notice_time);
         }
+
     }
 }
 

app/src/main/java/com/community/pocket/ui/main/ui/forum/main/ForumFragment.java

@@ -1,23 +1,25 @@
 package com.community.pocket.ui.main.ui.forum.main;
 
+import android.annotation.SuppressLint;
 import android.os.Build;
 import android.os.Bundle;
+import android.view.MotionEvent;
 import android.view.View;
 import android.widget.Button;
+import android.widget.ImageView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.core.widget.NestedScrollView;
-import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModelProvider;
-import androidx.viewpager2.widget.ViewPager2;
 
 import com.community.pocket.R;
 import com.community.pocket.data.adapter.NoticeAdpter;
 import com.community.pocket.data.model.Notice;
 import com.community.pocket.ui.main.MainFragment;
 import com.community.pocket.ui.main.ui.share.Response;
+import com.youth.banner.indicator.RectangleIndicator;
 
 import org.xutils.view.annotation.ContentView;
 import org.xutils.view.annotation.Event;
@@ -32,7 +34,7 @@ import java.util.List;
 public class ForumFragment extends MainFragment {
 
     @ViewInject(R.id.paper)
-    private ViewPager2 viewPager2;
+    private MyBanner banner;
 
     @ViewInject(R.id.scroll_body)
     private NestedScrollView nestedScrollView;
@@ -40,6 +42,11 @@ public class ForumFragment extends MainFragment {
     @ViewInject(R.id.forum_new)
     private Button newButton;
 
+    @ViewInject(R.id.notice_prev)
+    private ImageView noticePrev;
+    @ViewInject(R.id.notice_next)
+    private ImageView noticeNext;
+
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
@@ -48,34 +55,75 @@ public class ForumFragment extends MainFragment {
 
         viewModel.loadNotice();
 
-        newButton.setOnClickListener(new View.OnClickListener() {
-            @RequiresApi(api = Build.VERSION_CODES.KITKAT)
-            @Override
-            public void onClick(View v) {
-                _new(v);
+        newButton.setOnClickListener(this::_new);
+
+        //监控公告信息请求状态
+        viewModel.getNoticeDataResponse().observe(getViewLifecycleOwner(), forumNoticeResponse -> {
+            if (forumNoticeResponse == null) {
+                return;
+            }
+
+            forumNoticeResponse.toast(getContext());
+
+            if (forumNoticeResponse.getResult() == Response.Result.OK) {
+                initNotice(forumNoticeResponse.getNoticeList());
+            }
+        });
+    }
+
+    //初始化公告箭头事件
+    private void initArrow() {
+        initFocusListener(noticePrev);
+        initFocusListener(noticeNext);
+        initClickListener(noticePrev);
+        initClickListener(noticeNext);
+    }
+
+    //箭头随焦点改变透明度
+    @SuppressLint("ClickableViewAccessibility")
+    private void initFocusListener(ImageView imageView) {
+        imageView.setOnTouchListener((v, event) -> {
+            switch (event.getAction()) {
+                case MotionEvent.ACTION_DOWN:
+                    v.setAlpha(1);
+                    break;
+                case MotionEvent.ACTION_UP:
+                    v.setAlpha(0.1f);
+                    break;
             }
+            return false;
         });
+    }
 
-        //监控公告信息请求状态
-        viewModel.getNoticeDataResponse().observe(getViewLifecycleOwner(), new Observer<ForumNoticeResponse>() {
-            @Override
-            public void onChanged(ForumNoticeResponse forumNoticeResponse) {
-                if (forumNoticeResponse == null) {
-                    return;
-                }
-
-                forumNoticeResponse.toast(getContext());
-
-                if (forumNoticeResponse.getResult() == Response.Result.OK) {
-                    initNotice(forumNoticeResponse.getNoticeList());
-                }
+    //箭头点击事件
+    private void initClickListener(ImageView imageView) {
+        imageView.setOnClickListener(v -> {
+            if (imageView == noticePrev) {
+                banner.setCurrentItem(banner.getCurrentItem() > 0 ? banner.getCurrentItem() - 1 : banner.getItemCount() - 1);
+            } else {
+                banner.setCurrentItem(banner.getCurrentItem() < banner.getItemCount() - 1 ? banner.getCurrentItem() + 1 : 0);
             }
         });
     }
 
     //加载公告信息
-    private void initNotice(List<Notice> notices) {
-        viewPager2.setAdapter(new NoticeAdpter(notices));
+    private void initNotice(final List<Notice> notices) {
+
+        banner.setAdapter(new NoticeAdpter(notices));
+        banner.setIndicator(new RectangleIndicator(getContext()));
+        banner.setIndicatorWidth(100, 200);
+        banner.setIndicatorNormalColor(getResources().getColor(R.color.colorAccent));
+        banner.setIndicatorSelectedColor(getResources().getColor(R.color.colorBlack));
+
+        if (notices.size() >= 2) {
+            noticePrev.setVisibility(View.VISIBLE);
+            noticeNext.setVisibility(View.VISIBLE);
+        } else {
+            noticePrev.setVisibility(View.GONE);
+            noticeNext.setVisibility(View.GONE);
+        }
+
+        initArrow();
     }
 
     private void scrollTop() {

app/src/main/java/com/community/pocket/ui/main/ui/forum/main/MyBanner.java

@@ -0,0 +1,32 @@
+package com.community.pocket.ui.main.ui.forum.main;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+
+import androidx.annotation.NonNull;
+
+import com.community.pocket.data.adapter.NoticeAdpter;
+import com.community.pocket.data.model.Notice;
+import com.youth.banner.Banner;
+
+public class MyBanner extends Banner<Notice, NoticeAdpter> {
+
+    public MyBanner(@NonNull Context context) {
+        super(context);
+    }
+
+    public MyBanner(@NonNull Context context, @NonNull AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public MyBanner(@NonNull Context context, @NonNull AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent event) {
+        super.onInterceptTouchEvent(event);
+        return event.getAction() == MotionEvent.ACTION_DOWN;
+    }
+}

app/src/main/java/com/community/pocket/util/Param.java

@@ -4,9 +4,17 @@ package com.community.pocket.util;
  * 参数传递Key
  */
 public enum Param {
+    //重置密码用户
     username,
+    //重置密码邮箱
     email,
+    //论坛帖子id
     forumId,
+    //访客预约是否外来人口
     isOutPeople,
-    enable
+    //我的信息修改密码按钮是否启用
+    enable,
+    //公告滚动页数
+    notice_prev,
+    notice_next
 }

app/src/main/res/drawable/ic_arrow_left.xml

@@ -0,0 +1,9 @@
+<vector android:height="100dp"
+    android:viewportHeight="1024"
+    android:viewportWidth="1024"
+    android:width="100dp"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <path
+        android:fillColor="#323233"
+        android:pathData="M299.52,521.73c-3.28,-13.93 0.51,-29.18 11.37,-40.04l341.91,-341.91c16.69,-16.69 43.72,-16.69 60.31,0s16.69,43.72 0,60.31L401.31,512l311.91,311.91c16.69,16.69 16.69,43.72 0,60.31s-43.72,16.69 -60.31,0l-342.02,-341.91c-5.63,-5.63 -9.63,-12.8 -11.37,-20.58z" />
+</vector>

app/src/main/res/drawable/ic_arrow_right.xml

@@ -0,0 +1,9 @@
+<vector android:height="100dp"
+    android:viewportHeight="1024"
+    android:viewportWidth="1024"
+    android:width="100dp"
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <path
+        android:fillColor="#323233"
+        android:pathData="M724.48,521.73c-1.84,7.78 -5.73,14.85 -11.37,20.48l-341.91,342.02c-16.69,16.69 -43.72,16.69 -60.31,0s-16.69,-43.72 0,-60.31L622.69,512 310.89,200.09c-16.69,-16.69 -16.69,-43.72 0,-60.31 16.69,-16.69 43.72,-16.69 60.31,0l341.91,341.91c10.85,10.85 14.64,26.11 11.37,40.04z" />
+</vector>

app/src/main/res/layout/main/layout/forum/layout/forum.xml

@@ -26,10 +26,41 @@
             android:layout_height="wrap_content"
             android:orientation="vertical">
 
-            <androidx.viewpager2.widget.ViewPager2
-                android:id="@+id/paper"
+            <androidx.constraintlayout.widget.ConstraintLayout
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content" />
+                android:layout_height="wrap_content">
+
+                <ImageView
+                    android:id="@+id/notice_next"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="32dp"
+                    android:alpha="0.1"
+                    android:contentDescription="@string/notice_next"
+                    android:visibility="gone"
+                    app:layout_constraintEnd_toEndOf="@id/paper"
+                    app:layout_constraintTop_toTopOf="@id/paper"
+                    app:srcCompat="@drawable/ic_arrow_right" />
+
+                <ImageView
+                    android:id="@+id/notice_prev"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="32dp"
+                    android:alpha="0.1"
+                    android:contentDescription="@string/notice_prev"
+                    android:visibility="gone"
+                    app:layout_constraintStart_toStartOf="@id/paper"
+                    app:layout_constraintTop_toTopOf="@id/paper"
+                    app:srcCompat="@drawable/ic_arrow_left" />
+
+                <com.community.pocket.ui.main.ui.forum.main.MyBanner
+                    android:id="@+id/paper"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
+            </androidx.constraintlayout.widget.ConstraintLayout>
 
             <androidx.fragment.app.FragmentContainerView
                 android:id="@+id/fragment"

app/src/main/res/layout/main/layout/forum/layout/forum_notice.xml

@@ -56,8 +56,10 @@
         android:id="@+id/notice_time"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
         android:gravity="end"
         android:textSize="24sp"
+        app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/notice_author" />

app/src/main/res/values-en-rUS/strings.xml

@@ -220,4 +220,6 @@
     <string name="no_score_history">no data</string>
     <string name="change_score">score%1d</string>
     <string name="score_notes">notes:\n%1s</string>
+    <string name="notice_prev">notice prev</string>
+    <string name="notice_next">notice next</string>
 </resources>

app/src/main/res/values-zh-rCN/strings.xml

@@ -220,4 +220,6 @@
     <string name="no_score_history">暂无历史信用分记录</string>
     <string name="change_score">信用分%1d</string>
     <string name="score_notes">备注信息：\n%1s</string>
+    <string name="notice_prev">上一条公告</string>
+    <string name="notice_next">下一条公告</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -221,6 +221,8 @@
     <string name="no_score_history">no data</string>
     <string name="change_score">score%1d</string>
     <string name="score_notes">notes:\n%1s</string>
+    <string name="notice_prev">notice prev</string>
+    <string name="notice_next">notice next</string>
     <!-- Strings used for fragments for navigation -->
 
     <!-- Strings used for fragments for navigation -->