前言：

之前一直有朋友问我点赞怎么实现？今天趁着休息时间整理出来，其实点赞的功能和用户评论差不多，都是显示一个用户列表，只不过评论有评论内容和回复评论功能。实现点赞的思路如下：

1.当用户点击点赞按钮后，根据点赞状态来判断和显示：

1.1 如果此用户的操作是点赞，就把此用户加入到点赞列表中，并且点赞状态设置为1，然后请求点赞接口，刷新本地数据；

1.2 如果此用户的操作是取消点赞，此时循环查询点赞列表，如果此用户在点赞列表中就把此用户从列表中移除，如果不在点赞列表中就把此用户加入点赞列表，并且把点赞状态设置为0，请求点赞接口，刷新本地数据.

2.实现以上逻辑的主要代码截图如下：

/*** 请求点赞接口，这里写的模拟数据*/
private void getLikeData() {if (likeBean != null ) {List<CircleBean.DataBean> list = circleAdapter.getData();if (isLike == 1) {Iterator it = list.get(comPosition).getLike_list().iterator();List<LikeListBean> likeListBeans = new ArrayList<>();while (it.hasNext()) {LikeListBean info = (LikeListBean) it.next();if (info.getUser_id().equals(String.valueOf(userId))) {it.remove();} else {likeListBeans.add(info);}}LikeListBean likeListBean = new LikeListBean();likeListBean.setUser_id(userId+"");likeListBean.setUser_name(userName);list.get(comPosition).setIs_like(0);list.get(comPosition).setLike_list(likeListBeans);ToastUtils.ToastShort("取消点赞");} else {LikeListBean likeListBean = new LikeListBean();likeListBean.setUser_id(userId + "");likeListBean.setUser_name(userName);list.get(comPosition).getLike_list().add(likeListBean);list.get(comPosition).setIs_like(1);ToastUtils.ToastShort("点赞成功");}circleAdapter.notifyDataSetChanged();}
}

3.实现的效果截图如下：由于是写的模拟数据，所以效果和真实的差不多，大家只要理解逻辑就行.

4.MainActivity完整代码如下：

package com.example.expandtextview;
​
import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
​
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;
​
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.DataSource;
import com.bumptech.glide.load.engine.GlideException;
import com.bumptech.glide.request.RequestListener;
import com.bumptech.glide.request.target.Target;
import com.example.expandtextview.activity.PlayVideoActivity;
import com.example.expandtextview.activity.WatchLiveActivity;
import com.example.expandtextview.adapter.CircleAdapter;
import com.example.expandtextview.bean.CircleBean;
import com.example.expandtextview.bean.CommentListBean;
import com.example.expandtextview.bean.LikeBean;
import com.example.expandtextview.bean.LikeListBean;
import com.example.expandtextview.bean.WeatherEvent;
import com.example.expandtextview.util.AssetsUtil;
import com.example.expandtextview.util.CommonUtils;
import com.example.expandtextview.util.Constants;
import com.example.expandtextview.util.GlideSimpleTarget;
import com.example.expandtextview.util.KeyboardUtil;
import com.example.expandtextview.util.RxBus;
import com.example.expandtextview.util.StorageUtil;
import com.example.expandtextview.util.ToastUtils;
import com.example.expandtextview.util.Utils;
import com.example.expandtextview.view.LikePopupWindow;
import com.example.expandtextview.view.OnPraiseOrCommentClickListener;
import com.example.expandtextview.view.ScrollSpeedLinearLayoutManger;
import com.example.expandtextview.view.SpaceDecoration;
import com.github.ielse.imagewatcher.ImageWatcher;
import com.tbruyelle.rxpermissions2.RxPermissions;
​
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
​
import io.reactivex.Observer;
import io.reactivex.disposables.CompositeDisposable;
import io.reactivex.disposables.Disposable;
​
/*** @作者: njb* @时间: 2019/7/22 10:53* @描述: 仿微信朋友圈实现*/
public class MainActivity extends AppCompatActivity implements View.OnClickListener, CircleAdapter.Click, ImageWatcher.OnPictureLongPressListener, ImageWatcher.Loader {private RecyclerView recyclerView;private CircleAdapter circleAdapter;private String content;private LikePopupWindow likePopupWindow;private EditText etComment;private LinearLayout llComment;private TextView tvSend;private LinearLayout llScroll;private int editTextBodyHeight;private int currentKeyboardH;private int selectCommentItemOffset;private int commentPosition;protected final String TAG = this.getClass().getSimpleName();CompositeDisposable compositeDisposable;private ScrollSpeedLinearLayoutManger layoutManger;private List<CircleBean.DataBean> dataBeans;ImageWatcher imageWatcher;private int isLike;private int comPosition;private String to_user_id;private String to_user_name;private String circle_id;private String userId;private String userName;private RxPermissions rxPermissions;private static MyHandler myHandler;private static String dstPath;private ImageView ivBg;private ImageView ivUser;private TextView tvName;private ConstraintLayout clMessage;private ImageView ivMessage;private TextView tvMessage;private List<LikeListBean> likeBean;
​@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();initData();initAdapter();setListener();initRxBus();}
​private void initRxBus() {compositeDisposable = new CompositeDisposable();RxBus.getInstance().toObservable(WeatherEvent.class).subscribe(new Observer<WeatherEvent>() {@Overridepublic void onSubscribe(Disposable d) {compositeDisposable.add(d);}
​@Overridepublic void onNext(WeatherEvent weatherEvent) {Log.e("weather", weatherEvent.getTemperature() + "-**-" + weatherEvent.getCityName());}
​@Overridepublic void onError(Throwable e) {
​}
​@Overridepublic void onComplete() {
​}});}
​private void setListener() {tvSend.setOnClickListener(this);etComment.addTextChangedListener(new TextWatcher() {@Overridepublic void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
​}
​@Overridepublic void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {content = etComment.getText().toString();if (etComment.getText().length() == 500) {Toast.makeText(MainActivity.this, getResources().getString(R.string.the_content_of_the_comment_cannot_exceed_500_words), Toast.LENGTH_SHORT).show();}}
​@Overridepublic void afterTextChanged(Editable editable) {}});recyclerView.setOnTouchListener((view, motionEvent) -> {if (llComment.getVisibility() == View.VISIBLE) {updateEditTextBodyVisible(View.GONE);return true;}return false;});circleAdapter.setOnItemChildClickListener((adapter, view, position) -> {userId = Objects.requireNonNull(circleAdapter.getItem(position)).getId();userName = Objects.requireNonNull(circleAdapter.getItem(position)).getUser_name();isLike = Objects.requireNonNull(circleAdapter.getItem(position)).getIs_like();likeBean = new ArrayList<>(0);likeBean  = circleAdapter.getData().get(position).getLike_list();comPosition = position;switch (view.getId()) {case R.id.iv_edit://评论弹框showLikePopupWindow(view, position);break;case R.id.tv_delete://删除朋友圈deleteCircleDialog();break;//点击视频按钮跳转到视频播放界面case R.id.video_view:Intent intent = new Intent(this, PlayVideoActivity.class);intent.putExtra("url", Objects.requireNonNull(circleAdapter.getItem(position)).getVideo());startActivity(intent);break;default:break;}});}
​private void showLikePopupWindow(View view, int position) {//item 底部y坐标final int mBottomY = getCoordinateY(view) + view.getHeight();if (likePopupWindow == null) {likePopupWindow = new LikePopupWindow(this, isLike);}likePopupWindow.setOnPraiseOrCommentClickListener(new OnPraiseOrCommentClickListener() {@Overridepublic void onPraiseClick(int position) {//调用点赞接口getLikeData();likePopupWindow.dismiss();}
​@Overridepublic void onCommentClick(int position) {llComment.setVisibility(View.VISIBLE);etComment.requestFocus();etComment.setHint("说点什么");to_user_id = null;KeyboardUtil.showSoftInput(MainActivity.this);likePopupWindow.dismiss();etComment.setText("");view.postDelayed(() -> {int y = getCoordinateY(llComment) - 20;//评论时滑动到对应item底部和输入框顶部对齐recyclerView.smoothScrollBy(0, mBottomY - y);}, 300);}
​@Overridepublic void onClickFrendCircleTopBg() {
​}
​@Overridepublic void onDeleteItem(String id, int position) {
​}
​}).setTextView(isLike).setCurrentPosition(position);if (likePopupWindow.isShowing()) {likePopupWindow.dismiss();} else {likePopupWindow.showPopupWindow(view);}}
​/*** 请求点赞接口，这里写的模拟数据*/private void getLikeData() {if (likeBean != null ) {List<CircleBean.DataBean> list = circleAdapter.getData();if (isLike == 1) {Iterator it = list.get(comPosition).getLike_list().iterator();List<LikeListBean> likeListBeans = new ArrayList<>();while (it.hasNext()) {LikeListBean info = (LikeListBean) it.next();if (info.getUser_id().equals(String.valueOf(userId))) {it.remove();} else {likeListBeans.add(info);}}LikeListBean likeListBean = new LikeListBean();likeListBean.setUser_id(userId+"");likeListBean.setUser_name(userName);list.get(comPosition).setIs_like(0);list.get(comPosition).setLike_list(likeListBeans);ToastUtils.ToastShort("取消点赞");} else {LikeListBean likeListBean = new LikeListBean();likeListBean.setUser_id(userId + "");likeListBean.setUser_name(userName);list.get(comPosition).getLike_list().add(likeListBean);list.get(comPosition).setIs_like(1);ToastUtils.ToastShort("点赞成功");}circleAdapter.notifyDataSetChanged();}}
​
​private void deleteCircleDialog() {final AlertDialog.Builder alert = new AlertDialog.Builder(this);alert.setTitle("提示");alert.setMessage("你确定要删除吗?");alert.setNegativeButton("取消", null);alert.setPositiveButton("确定", (dialog, which) -> {//调接口删除,这里写死dialog.dismiss();startActivity(new Intent(this, WatchLiveActivity.class));});alert.show();}
​
​private void setViewTreeObserver() {final ViewTreeObserver swipeRefreshLayoutVTO = llScroll.getViewTreeObserver();swipeRefreshLayoutVTO.addOnGlobalLayoutListener(() -> {Rect r = new Rect();llScroll.getWindowVisibleDisplayFrame(r);int statusBarH = Utils.getStatusBarHeight();//状态栏高度int screenH = llScroll.getRootView().getHeight();if (r.top != statusBarH) {//r.top代表的是状态栏高度，在沉浸式状态栏时r.top＝0，通过getStatusBarHeight获取状态栏高度r.top = statusBarH;}int keyboardH = screenH - (r.bottom - r.top);Log.d(TAG, "screenH＝ " + screenH + " &keyboardH = " + keyboardH + " &r.bottom=" + r.bottom + " &top=" + r.top + " &statusBarH=" + statusBarH);
​if (keyboardH == currentKeyboardH) {//有变化时才处理，否则会陷入死循环return;}currentKeyboardH = keyboardH;editTextBodyHeight = llComment.getHeight();if (keyboardH < 150) {//说明是隐藏键盘的情况MainActivity.this.updateEditTextBodyVisible(View.GONE);return;}});}
​/*** 初始化控件*/private void initViews() {recyclerView = findViewById(R.id.recyclerView);llComment = findViewById(R.id.ll_comment);etComment = findViewById(R.id.et_comment);tvSend = findViewById(R.id.tv_send_comment);llScroll = findViewById(R.id.ll_scroll);imageWatcher = findViewById(R.id.imageWatcher);//初始化仿微信图片滑动加载器imageWatcher.setTranslucentStatus(Utils.calcStatusBarHeight(this));imageWatcher.setErrorImageRes(R.mipmap.error_picture);imageWatcher.setOnPictureLongPressListener(this);imageWatcher.setLoader(this);getPermissions();myHandler = new MyHandler(this);}
​/*** 初始化数据** @param*/private void initData() {dataBeans = new ArrayList<>();dataBeans = AssetsUtil.getStates(this);}
​/*** 设置adapter*/private void initAdapter() {View headCircle = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_circle_head, null);initHead(headCircle);circleAdapter = new CircleAdapter(dataBeans, imageWatcher, llComment, etComment, this);layoutManger = new ScrollSpeedLinearLayoutManger(this);recyclerView.setLayoutManager(layoutManger);layoutManger.setSpeedSlow();circleAdapter.addHeaderView(headCircle);recyclerView.addItemDecoration(new SpaceDecoration(this));recyclerView.setAdapter(circleAdapter);}
​/*** 初始化消息提醒布局* @param headCircle*/private void initHead(View headCircle) {ivBg = headCircle.findViewById(R.id.iv_bg);ivUser = headCircle.findViewById(R.id.iv_user);tvName = headCircle.findViewById(R.id.tv_name);clMessage = headCircle.findViewById(R.id.cl_message);ivMessage = headCircle.findViewById(R.id.message_avatar);tvMessage = headCircle.findViewById(R.id.message_detail);ivBg.setOnClickListener(this);ivUser.setOnClickListener(this);//这里是调用接口数据，本例子写的假数据，可以自己根据需求来写clMessage.setVisibility(View.VISIBLE);tvMessage.setText("10条新信息");}
​public void updateEditTextBodyVisible(int visibility) {llComment.setVisibility(visibility);if (View.VISIBLE == visibility) {llComment.requestFocus();//弹出键盘CommonUtils.showSoftInput(etComment.getContext(), etComment);
​} else if (View.GONE == visibility) {//隐藏键盘CommonUtils.hideSoftInput(etComment.getContext(), etComment);}}
​/*** 获取控件左上顶点Y坐标** @param view* @return*/private int getCoordinateY(View view) {int[] coordinate = new int[2];view.getLocationOnScreen(coordinate);return coordinate[1];}
​
​@Overridepublic void onClick(View view) {int i = view.getId();if (i == R.id.tv_send_comment) {if (TextUtils.isEmpty(etComment.getText().toString())) {Toast.makeText(MainActivity.this, "请输入评论内容", Toast.LENGTH_SHORT).show();return;}//请求接口，在成功回调方法拼接评论信息,这里写死getComment();setViewTreeObserver();}}
​private void getComment() {List<CircleBean.DataBean> list = circleAdapter.getData();CommentListBean commentListBean = new CommentListBean();//userId为当前用户id,这里只是一个例子所以没有登录注册commentListBean.setUser_id(userId);//userName为当前用户名称commentListBean.setUser_name(userName);commentListBean.setTo_user_name(TextUtils.isEmpty(to_user_name) ? "" : to_user_name);commentListBean.setTo_user_id(TextUtils.isEmpty(to_user_id) ? "" : to_user_id);commentListBean.setCircle_id(circle_id);commentListBean.setContent(content);if (TextUtils.isEmpty(to_user_id)) {ToastUtils.ToastShort("评论成功");list.get(comPosition).getComments_list().add(commentListBean);} else {ToastUtils.ToastShort("回复成功");list.get(commentPosition).getComments_list().add(commentListBean);}circleAdapter.notifyDataSetChanged();KeyboardUtil.hideSoftInput(MainActivity.this);llComment.setVisibility(View.GONE);etComment.setText("");}
​@Overrideprotected void onDestroy() {super.onDestroy();//取消订阅RxBus.rxBusUnbund(compositeDisposable);myHandler.removeCallbacksAndMessages(null);}
​@Overridepublic void Commend(int position, CommentListBean bean) {circle_id = bean.getCircle_id();commentPosition = position;to_user_name = bean.getUser_name();to_user_id = bean.getUser_id();}
​@Overridepublic void load(Context context, Uri uri, ImageWatcher.LoadCallback loadCallback) {Glide.with(context).asBitmap().load(uri.toString()).into(new GlideSimpleTarget(loadCallback));}
​@Overridepublic void onPictureLongPress(ImageView v, Uri uri, int pos) {final AlertDialog.Builder alert = new AlertDialog.Builder(this);alert.setTitle("保存图片");alert.setMessage("你确定要保存图片吗?");alert.setNegativeButton("取消", null);alert.setPositiveButton("确定", (dialog, which) -> {rxPermissions.request(Manifest.permission.WRITE_EXTERNAL_STORAGE).subscribe(granted -> {if (granted) {if (uri != null) {// Always true pre-MsavePhoto(uri);}} else {ToastUtils.ToastShort("缺少必要权限,请授予权限");}});dialog.dismiss();
​});alert.show();}
​@SuppressLint("HandlerLeak")private class MyHandler extends Handler {private WeakReference<Activity> mActivity;private Bitmap bitmap;
​private MyHandler(Activity activity) {mActivity = new WeakReference<>(activity);}
​@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);final Activity activity = mActivity.get();if (activity != null) {if (msg.what == 1) {try {bitmap = (Bitmap) msg.obj;if (Utils.saveBitmap(bitmap, dstPath, false)) {try {ContentValues values = new ContentValues(2);values.put(MediaStore.Images.Media.MIME_TYPE, Constants.MIME_JPEG);values.put(MediaStore.Images.Media.DATA, dstPath);getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);ToastUtils.ToastShort(activity, getResources().getString(R.string.picture_save_to));} catch (Exception e) {ToastUtils.ToastShort(activity, getResources().getString(R.string.picture_save_fail));}} else {ToastUtils.ToastShort(activity, getResources().getString(R.string.picture_save_fail));}} catch (Exception e) {e.printStackTrace();ToastUtils.ToastShort(activity, getResources().getString(R.string.picture_save_fail));}}}}}
​private void getPermissions() {rxPermissions = new RxPermissions(this);}
​/*** 长按保存图片* @param uri 图片url地址*/private void savePhoto(Uri uri) {Glide.with(MainActivity.this).asBitmap().load(uri).listener(new RequestListener<Bitmap>() {@Overridepublic boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, DataSource dataSource, boolean isFirstResource) {String picPath = StorageUtil.getSystemImagePath();dstPath = picPath + (System.currentTimeMillis() / 1000) + ".jpeg";Message message = Message.obtain();message.what = 1;message.obj = resource;myHandler.sendMessage(message);return false;}
​@Overridepublic boolean onLoadFailed(@Nullable GlideException e, Object model, Target target, boolean isFirstResource) {return false;}}).submit();}
}

5.以上就是实现仿朋友圈点赞的简单实现，大家理解逻辑后可以自行尝试，如有问题及时提示，我一定会吸取好的建议，多多学习，一起成长。

6.项目的完整源码地址：

ExpandTextView: 实现仿微信朋友圈列表多类型布局，图片点击放大、保存，包含点赞、评论、消息提醒、视频播放等功能

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