腾讯微博列表展示的功能实现
来源：互联网 发布：广州拓飞涉密数据恢复 编辑：程序博客网 时间：2024/06/11 18:08
资料和思维逻辑来源于网络学习——>黑马程序员
从大学起就一直有看黑马的一些视频，现在没事偶尔也会去看一下，
整体教学质量都是很不错的。
这次去看到他有这个例子，就借鉴他的资料，自己写了一个，主要是我把BaseAdapter换成github上开源的BaseRecyclerViewAdapterHelper，其他的地方没有太大的改动，加了刷新和加载更多
先看效果图
引入我们要使用的工具
compile 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.30' compile 'com.android.support:recyclerview-v7:26.0.0-alpha1' compile 'com.google.code.gson:gson:2.2.4'GlobalUtils包含获取assets资源，测量屏幕宽度等工具类
package tsou.cn.weibolist.util;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Matrix;import android.text.format.DateFormat;import android.util.DisplayMetrics;import java.io.ByteArrayOutputStream;import java.io.InputStream;public class GlobalUtils { private static Context context; private static int mScreenWidth; private static int mScreenHeight; private static float mDensity; public static void init(Context context) { GlobalUtils.context = context; DisplayMetrics dm = context.getResources().getDisplayMetrics(); mScreenWidth = dm.widthPixels; mScreenHeight = dm.heightPixels; mDensity = dm.density; } /** * 单位转换dp转px */ public static int dp2px(int dp) { return (int) (dp * mDensity + 0.5f); } /** * 读取assets目录下的文件 * * @param fileName 文件名 * @return */ public static String readAssets(String fileName) { String str = ""; try { InputStream stream = context.getResources().getAssets().open(fileName); byte[] buffer = new byte[1024]; int len = -1; ByteArrayOutputStream baos = new ByteArrayOutputStream(); while ((len = stream.read(buffer)) != -1) { // 读取数据到内存中 baos.write(buffer, 0, len); } str = baos.toString("utf-8"); stream.close(); baos.close(); } catch (Exception e) { e.printStackTrace(); } return str; } public static String formatDate(long time) { return DateFormat.format("yyyy-MM-dd kk:mm:ss", time).toString(); } /** * 根据图片名称获取资源id * 例如：传入"avatar_01", 表示获取整数值R.drawable.avatar_01 * * @param context * @param drawableName * @return */ public static int getResId(Context context, String drawableName) { return context.getResources().getIdentifier( drawableName, "drawable", context.getPackageName()); } /** * 获取宫格图片的宽高 */ public static int getGridWidth() { // 左边距： 10dp // 右边距： 10dp // 图片宫格的宽度 = (屏幕宽度-左边距-右边距) / 3 return (GlobalUtils.mScreenWidth - GlobalUtils.dp2px(10 + 10)) / 3; } /** * 根据一张原图生成一张指定宽高的图片 * * @param bitmap 原图 * @param width 要生成图片的宽高 * @return */ public static Bitmap createBitmap(Bitmap bitmap, int width) { float scaleX = ((float) width) / bitmap.getWidth(); float scaleY = ((float) width) / bitmap.getHeight(); Matrix matrix = new Matrix(); matrix.postScale(scaleX, scaleY); return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true); }}初始化GlobalUtils类
package tsou.cn.weibolist;import android.app.Application;import tsou.cn.weibolist.util.GlobalUtils;/** * Created by Administrator on 2017/11/13 0013. */public class MyApplication extends Application { @Override public void onCreate() { super.onCreate(); // 初始化GlobalUtils类 GlobalUtils.init(this); }}主页列表布局
<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="tsou.cn.weibolist.MainActivity"> <android.support.v4.widget.SwipeRefreshLayout android:id="@+id/swipe_refresh" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/recycler_view" android:layout_width="match_parent" android:layout_height="match_parent" tools:layout_editor_absoluteX="8dp" tools:layout_editor_absoluteY="8dp" /> </android.support.v4.widget.SwipeRefreshLayout></FrameLayout>创建列表adapter
package tsou.cn.weibolist.adapter;import android.support.annotation.Nullable;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.chad.library.adapter.base.BaseQuickAdapter;import com.chad.library.adapter.base.BaseViewHolder;import java.util.List;import tsou.cn.weibolist.R;import tsou.cn.weibolist.bean.Weibo;import tsou.cn.weibolist.util.EmojiUtil;import tsou.cn.weibolist.util.GlobalUtils;import tsou.cn.weibolist.util.LinkifyUtil;/** * Created by Administrator on 2017/11/13 0013. */public class WeiboAdapter extends BaseQuickAdapter<Weibo.WeiboBean, BaseViewHolder> { public WeiboAdapter(@Nullable List<Weibo.WeiboBean> data) { super(R.layout.item_weibo, data); } @Override protected void convert(BaseViewHolder helper, Weibo.WeiboBean item) { helper.setText(R.id.tv_user, item.getUsername()); helper.setText(R.id.tv_user_introduction, item.getUser_introduction()); // 显示头像 int imageResId = GlobalUtils.getResId(helper.itemView.getContext(), item.getAvatar()); helper.setBackgroundRes(R.id.iv_avatar, imageResId); // 微博内容 //helper.setText(R.id.tv_content, item.getContent()); EmojiUtil.setText((TextView) helper.getView(R.id.tv_content), item.getContent()); LinkifyUtil.addCustomLink((TextView) helper.getView(R.id.tv_content)); LinkifyUtil.addUserCustomLink((TextView) helper.getView(R.id.tv_content)); helper.setText(R.id.tv_date, GlobalUtils.formatDate(item.getDate())); //展示九宫格 GridLayoutManager manager = new GridLayoutManager(mContext, 3); RecyclerView mRecyclerView = helper.getView(R.id.rv_weibo_images); mRecyclerView.setLayoutManager(manager); ImageAdapter mAdapter = new ImageAdapter(null); mRecyclerView.setAdapter(mAdapter); //显示微博图片 int imageCount = item.getImageUrls() == null ? 0 : item.getImageUrls().size(); if (imageCount == 0) {//没有微博 mRecyclerView.setVisibility(View.GONE); } else {//有微博 mRecyclerView.setVisibility(View.VISIBLE); //刷新图片数据 mAdapter.setNewData(item.getImageUrls()); //动态指定图片宫格的宽高和recycleview的宽高 //1张图片->1列 //4张图片 ->2列 //其他 ->3列 ViewGroup.LayoutParams layoutParams = mRecyclerView.getLayoutParams(); if (imageCount == 1) { manager.setSpanCount(1); layoutParams.width = ViewGroup.LayoutParams.WRAP_CONTENT; } else if (imageCount == 4) { manager.setSpanCount(2); //两个图片的宽度 layoutParams.width = GlobalUtils.getGridWidth() * 2; } else { manager.setSpanCount(3); layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT; } } }}图片列表adapter
package tsou.cn.weibolist.adapter;import android.support.annotation.Nullable;import android.view.ViewGroup;import com.chad.library.adapter.base.BaseQuickAdapter;import com.chad.library.adapter.base.BaseViewHolder;import java.util.List;import tsou.cn.weibolist.R;import tsou.cn.weibolist.util.GlobalUtils;/** * Created by Administrator on 2017/11/13 0013. */public class ImageAdapter extends BaseQuickAdapter<String, BaseViewHolder> { public ImageAdapter(@Nullable List<String> data) { super(R.layout.item_image, data); } @Override protected void convert(BaseViewHolder helper, String item) { //动态设置图片宫格的宽高 //1张图片 -> 宫格的宽高为图片的宽高 //其他情况 -> 宫格的宽高为宽度3分之一 ViewGroup.LayoutParams layoutParams = helper.itemView.getLayoutParams(); int resId = GlobalUtils.getResId(mContext, item); if (getItemCount() == 1) {//一张图片 layoutParams.width = GlobalUtils.getGridWidth() * 3; layoutParams.height = GlobalUtils.getGridWidth() * 3;// Bitmap bitmap = BitmapFactory.decodeResource(// mContext.getResources(), resId);// // 指定宫格的宽高为图片的宽高// layoutParams.width = bitmap.getWidth();// layoutParams.height = bitmap.getHeight(); helper.setBackgroundRes(R.id.iv_image, resId); } else { layoutParams.width = GlobalUtils.getGridWidth(); layoutParams.height = GlobalUtils.getGridWidth(); helper.setBackgroundRes(R.id.iv_image, resId); } }}显示文本和表情
package tsou.cn.weibolist.util;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.text.SpannableString;import android.text.style.ImageSpan;import android.widget.TextView;import java.util.HashMap;import java.util.regex.Matcher;import java.util.regex.Pattern;import tsou.cn.weibolist.R;/** * Created by Administrator on 2017/11/13 0013. */public class EmojiUtil { /** * 显示文本和表情 * * @param textView * @param text */ public static void setText(TextView textView, String text) { Context context = textView.getContext(); Resources resources = context.getResources(); SpannableString ss = new SpannableString(text); // 正则表达式： [高兴] Pattern p = Pattern.compile("\\[([A-Za-z\u4E00-\u9FA5]+)\\]"); Matcher matcher = p.matcher(ss); while (matcher.find()) { // 匹配到一个表情字符串 String emoji = matcher.group(); // 过滤非表情符，比如： [xxx] if (EMOJI_DATAS.containsKey(emoji)) { // 是表情才处理 // 指定了一张图片 Bitmap bitmap = BitmapFactory.decodeResource(resources, EMOJI_DATAS.get(emoji)); bitmap = GlobalUtils.createBitmap(bitmap, GlobalUtils.dp2px(20)); // 图片的宽高为20dp ImageSpan span = new ImageSpan(context, bitmap, ImageSpan.ALIGN_BOTTOM); int start = matcher.start(); int end = matcher.end(); ss.setSpan(span, start, end, 0); } } textView.setText(ss); } private static final HashMap<String, Integer> EMOJI_DATAS = new HashMap<String, Integer>(); static { EMOJI_DATAS.put("[微笑]", R.drawable.smiley_0); EMOJI_DATAS.put("[伤心]", R.drawable.smiley_1); EMOJI_DATAS.put("[美女]", R.drawable.smiley_2); EMOJI_DATAS.put("[发呆]", R.drawable.smiley_3); EMOJI_DATAS.put("[墨镜]", R.drawable.smiley_4); EMOJI_DATAS.put("[大哭]", R.drawable.smiley_5); EMOJI_DATAS.put("[害羞]", R.drawable.smiley_6); EMOJI_DATAS.put("[闭嘴]", R.drawable.smiley_7); EMOJI_DATAS.put("[睡觉]", R.drawable.smiley_8); EMOJI_DATAS.put("[伤心]", R.drawable.smiley_9); EMOJI_DATAS.put("[冷汗]", R.drawable.smiley_10); EMOJI_DATAS.put("[发怒]", R.drawable.smiley_11); EMOJI_DATAS.put("[调皮]", R.drawable.smiley_12); EMOJI_DATAS.put("[呲牙]", R.drawable.smiley_13); EMOJI_DATAS.put("[惊讶]", R.drawable.smiley_14); EMOJI_DATAS.put("[难过]", R.drawable.smiley_15); EMOJI_DATAS.put("[酷]", R.drawable.smiley_16); EMOJI_DATAS.put("[汗]", R.drawable.smiley_17); EMOJI_DATAS.put("[抓狂]", R.drawable.smiley_18); EMOJI_DATAS.put("[吐]", R.drawable.smiley_19); EMOJI_DATAS.put("[偷笑]", R.drawable.smiley_20); EMOJI_DATAS.put("[快乐]", R.drawable.smiley_21); EMOJI_DATAS.put("[奇]", R.drawable.smiley_22); EMOJI_DATAS.put("[傲]", R.drawable.smiley_23); EMOJI_DATAS.put("[饿]", R.drawable.smiley_24); EMOJI_DATAS.put("[累]", R.drawable.smiley_25); EMOJI_DATAS.put("[惊恐]", R.drawable.smiley_26); EMOJI_DATAS.put("[汗]", R.drawable.smiley_27); EMOJI_DATAS.put("[高兴]", R.drawable.smiley_28); EMOJI_DATAS.put("[大兵]", R.drawable.smiley_29); EMOJI_DATAS.put("[奋斗]", R.drawable.smiley_30); EMOJI_DATAS.put("[骂]", R.drawable.smiley_31); EMOJI_DATAS.put("[疑问]", R.drawable.smiley_32); EMOJI_DATAS.put("[嘘]", R.drawable.smiley_33); EMOJI_DATAS.put("[晕]", R.drawable.smiley_34); EMOJI_DATAS.put("[痛苦]", R.drawable.smiley_35); EMOJI_DATAS.put("[衰]", R.drawable.smiley_36); EMOJI_DATAS.put("[鬼]", R.drawable.smiley_37); EMOJI_DATAS.put("[敲打]", R.drawable.smiley_38); EMOJI_DATAS.put("[再见]", R.drawable.smiley_39); EMOJI_DATAS.put("[冷汗]", R.drawable.smiley_40); EMOJI_DATAS.put("[挖鼻]", R.drawable.smiley_41); EMOJI_DATAS.put("[鼓掌]", R.drawable.smiley_42); EMOJI_DATAS.put("[出丑]", R.drawable.smiley_43); EMOJI_DATAS.put("[坏笑]", R.drawable.smiley_44); EMOJI_DATAS.put("[左嘘]", R.drawable.smiley_45); EMOJI_DATAS.put("[右嘘]", R.drawable.smiley_46); EMOJI_DATAS.put("[打哈欠]", R.drawable.smiley_47); EMOJI_DATAS.put("[鄙视]", R.drawable.smiley_48); EMOJI_DATAS.put("[委屈]", R.drawable.smiley_49); EMOJI_DATAS.put("[快哭了]", R.drawable.smiley_50); EMOJI_DATAS.put("[邪恶]", R.drawable.smiley_51); EMOJI_DATAS.put("[亲亲]", R.drawable.smiley_52); EMOJI_DATAS.put("[吓吓]", R.drawable.smiley_53); EMOJI_DATAS.put("[可怜]", R.drawable.smiley_54); EMOJI_DATAS.put("[菜刀]", R.drawable.smiley_55); EMOJI_DATAS.put("[西瓜]", R.drawable.smiley_56); EMOJI_DATAS.put("[啤酒]", R.drawable.smiley_57); EMOJI_DATAS.put("[篮球]", R.drawable.smiley_58); EMOJI_DATAS.put("[乒乓球]", R.drawable.smiley_59); EMOJI_DATAS.put("[喝茶]", R.drawable.smiley_60); EMOJI_DATAS.put("[吃饭]", R.drawable.smiley_61); EMOJI_DATAS.put("[猪头]", R.drawable.smiley_62); EMOJI_DATAS.put("[鲜花]", R.drawable.smiley_63); EMOJI_DATAS.put("[花谢]", R.drawable.smiley_64); EMOJI_DATAS.put("[吻]", R.drawable.smiley_65); EMOJI_DATAS.put("[红心]", R.drawable.smiley_66); EMOJI_DATAS.put("[心碎]", R.drawable.smiley_67); EMOJI_DATAS.put("[生日]", R.drawable.smiley_68); EMOJI_DATAS.put("[闪电]", R.drawable.smiley_69); EMOJI_DATAS.put("[地雷]", R.drawable.smiley_70); EMOJI_DATAS.put("[刀]", R.drawable.smiley_71); EMOJI_DATAS.put("[足球]", R.drawable.smiley_72); EMOJI_DATAS.put("[甲虫]", R.drawable.smiley_73); EMOJI_DATAS.put("[便便]", R.drawable.smiley_74); EMOJI_DATAS.put("[月亮]", R.drawable.smiley_75); EMOJI_DATAS.put("[太阳]", R.drawable.smiley_76); EMOJI_DATAS.put("[礼物]", R.drawable.smiley_77); EMOJI_DATAS.put("[拥抱]", R.drawable.smiley_78); EMOJI_DATAS.put("[强]", R.drawable.smiley_79); EMOJI_DATAS.put("[弱]", R.drawable.smiley_80); EMOJI_DATAS.put("[握手]", R.drawable.smiley_81); EMOJI_DATAS.put("[胜利]", R.drawable.smiley_82); EMOJI_DATAS.put("[抱拳]", R.drawable.smiley_83); EMOJI_DATAS.put("[勾引]", R.drawable.smiley_84); EMOJI_DATAS.put("[握拳]", R.drawable.smiley_85); EMOJI_DATAS.put("[差劲]", R.drawable.smiley_86); EMOJI_DATAS.put("[爱你]", R.drawable.smiley_87); EMOJI_DATAS.put("[No]", R.drawable.smiley_88); EMOJI_DATAS.put("[OK]", R.drawable.smiley_89); EMOJI_DATAS.put("[爱情]", R.drawable.smiley_90); EMOJI_DATAS.put("[飞吻]", R.drawable.smiley_91); EMOJI_DATAS.put("[跳跳]", R.drawable.smiley_92); EMOJI_DATAS.put("[发抖]", R.drawable.smiley_93); EMOJI_DATAS.put("[怄火]", R.drawable.smiley_94); EMOJI_DATAS.put("[转圈]", R.drawable.smiley_95); EMOJI_DATAS.put("[磕头]", R.drawable.smiley_96); EMOJI_DATAS.put("[回头]", R.drawable.smiley_97); EMOJI_DATAS.put("[跳绳]", R.drawable.smiley_98); EMOJI_DATAS.put("[投降]", R.drawable.smiley_99); EMOJI_DATAS.put("[激动]", R.drawable.smiley_100); EMOJI_DATAS.put("[乱舞]", R.drawable.smiley_101); EMOJI_DATAS.put("[献吻]", R.drawable.smiley_102); EMOJI_DATAS.put("[左太极]", R.drawable.smiley_103); EMOJI_DATAS.put("[右太极]", R.drawable.smiley_104); }}Linkify类自定义超链接
package tsou.cn.weibolist.util;import android.text.util.Linkify;import android.widget.TextView;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * 自定义超链接 * */public class LinkifyUtil { /** * 添加自定义超链接 */ public static void addCustomLink(TextView textView) { Pattern pattern = Pattern.compile("\\@([A-Za-z0-9\u4E00-\u9FA5]+)\\.?"); // http://www.baidu.com/path?uid=1&username=xx String scheme = "huangxiaoguo://user?id="; // 匹配过滤器 Linkify.MatchFilter matchFilter = new Linkify.MatchFilter() { @Override public boolean acceptMatch(CharSequence s, int start, int end) { String text = s.subSequence(start, end).toString(); if (text.endsWith(".")) { // 邮箱，不需要匹配 return false; } else { return true; // 返回true会显示为超链接 } } }; Linkify.TransformFilter transformFilter = null; Linkify.addLinks(textView, pattern, scheme, matchFilter, transformFilter); } public static void addUserCustomLink(TextView textView) { // @用户: Pattern pattern = Pattern.compile("\\#([A-Za-z0-9\u4E00-\u9FA5]+)\\#"); // http://www.baidu.com/path?uid=1&username=xx String scheme = "huangxiaoguo://topic?id="; // 匹配过滤器 Linkify.MatchFilter matchFilter = new Linkify.MatchFilter() { @Override public boolean acceptMatch(CharSequence s, int start, int end) { String text = s.subSequence(start, end).toString(); return true; } }; Linkify.TransformFilter transformFilter = new Linkify.TransformFilter() { @Override public String transformUrl(Matcher match, String url) { return match.group(1); } }; Linkify.addLinks(textView, pattern, scheme, matchFilter, transformFilter); }}manifest配置点击用户链接时，要调起该Activity
<!--点击用户链接时，要调起该Activity--> <activity android:name=".avtivity.UserActivity"> <intent-filter> <action android:name="android.intent.action.VIEW"/> <category android:name="android.intent.category.DEFAULT"/> <data android:scheme="huangxiaoguo" android:host="user"/> </intent-filter> </activity> <activity android:name=".avtivity.TopicActivity"> <intent-filter> <action android:name="android.intent.action.VIEW"/> <category android:name="android.intent.category.DEFAULT"/> <data android:scheme="huangxiaoguo" android:host="topic"/> </intent-filter> </activity>主页逻辑
package tsou.cn.weibolist;import android.graphics.Color;import android.os.AsyncTask;import android.os.Bundle;import android.os.SystemClock;import android.support.v4.widget.SwipeRefreshLayout;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import com.chad.library.adapter.base.BaseQuickAdapter;import com.google.gson.Gson;import java.util.ArrayList;import java.util.List;import tsou.cn.weibolist.adapter.WeiboAdapter;import tsou.cn.weibolist.bean.Weibo;import tsou.cn.weibolist.util.GlobalUtils;import tsou.cn.weibolist.view.CustomLoadMoreView;public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener, BaseQuickAdapter.RequestLoadMoreListener { private RecyclerView mRecyclerView; private WeiboAdapter mAdapter; private SwipeRefreshLayout mSwipeRefresh; private int mLastIndex; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initRecyclerView(); initListener(); mAdapter.setEnableLoadMore(false); mSwipeRefresh.setRefreshing(true); fetchData(true); } private void initView() { mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view); mSwipeRefresh = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh); mSwipeRefresh.setColorSchemeColors(Color.rgb(63, 81, 181)); } private void initRecyclerView() { mRecyclerView.setLayoutManager(new LinearLayoutManager(this)); mAdapter = new WeiboAdapter(null); mAdapter.isFirstOnly(false); mAdapter.openLoadAnimation(BaseQuickAdapter.ALPHAIN); mAdapter.setLoadMoreView(new CustomLoadMoreView()); mRecyclerView.setAdapter(mAdapter); } private void initListener() { mSwipeRefresh.setOnRefreshListener(this); mAdapter.setOnLoadMoreListener(this, mRecyclerView); } private boolean mIsRefresh; private void fetchData(boolean isRefresh) { mIsRefresh = isRefresh; if (isRefresh) { mLastIndex = 1; } new AsyncTask<Void, Void, Void>() { private List<Weibo.WeiboBean> weibo; @Override protected Void doInBackground(Void... voids) { SystemClock.sleep(3000); if (mLastIndex <= 3) { // 加载微博数据 String json = GlobalUtils.readAssets("weibo_list.json"); Gson gson = new Gson(); weibo = gson.fromJson(json, Weibo.class).getWeibo(); } else { weibo = new ArrayList<>(); } return null; } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid); if (mIsRefresh) { mAdapter.setNewData(weibo); mSwipeRefresh.setRefreshing(false); mAdapter.setEnableLoadMore(true); } else { if (weibo != null) { if (weibo.size() == 0) { mAdapter.loadMoreEnd(); } else { mAdapter.addData(weibo); mAdapter.loadMoreComplete(); } } } mLastIndex++; } }.execute(); } @Override public void onRefresh() { mAdapter.setEnableLoadMore(false); fetchData(true); } @Override public void onLoadMoreRequested() { if (mSwipeRefresh != null) { mSwipeRefresh.setEnabled(false); fetchData(false); mSwipeRefresh.setEnabled(true); } }}主要的逻辑代码已经完成，需要资源的请看git
https://gitee.com/huangxiaoguo/WeiBoLieBiaoShiXian
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