正文
- 可复用性 （是否重复代码和逻辑过多？）
- 可扩展性 （比如我这里是关注的人，传userId，下个地方又是文章 articleId）
- 可读性 冗余代码过多，势必要影响到可读性。
然后再看下自己写的代码，是否会面临上面的几个问题呢？是否有一种优雅的方式。帮我们一劳永逸。我这里给出一个解决方案是 使用Databinding ，如果对databinding使用不熟悉的，建议先去熟悉一下databinding用法
目标
Modle
要有两种状态，实体bean要继承自BaseObservable。配合databing实现mvvm效果，属性需要定义为@Bindable，当属性发生变化的时候，调用notifyPropertyChanged(属性ID)
public class User extends BaseObservable implements Serializable {
public boolean hasFollow;//是否关注，是和否
@Bindable
public boolean isHasFollow() {
return hasFollow;
}
public void setHasFollow(boolean hasFollow) {
this.hasFollow = hasFollow;
notifyPropertyChanged(com.mooc.ppjoke.BR._all);
}
}
页面布局如下
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="feed"
type="com.mooc.ppjoke.model.Feed" />
<variable
name="leftMargin"
type="java.lang.Integer" />
<variable
name="fullscreen"
type="java.lang.Boolean" />
<import type="com.mooc.ppjoke.utils.TimeUtils" />
<import type="com.mooc.ppjoke.ui.InteractionPresenter"></import>
<variable
name="owner"
type="androidx.lifecycle.LifecycleOwner" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/author_info"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/transparent"
android:orientation="vertical"
android:paddingLeft="@{leftMargin}"
android:paddingTop="@dimen/dp_3"
android:paddingBottom="@dimen/dp_3">
<com.mooc.ppjoke.view.PPImageView
android:id="@+id/author_avatar"
android:layout_width="@dimen/dp_40"
android:layout_height="@dimen/dp_40"
android:layout_marginTop="@dimen/dp_1"
app:image_url="@{feed.author.avatar}"
app:isCircle="@{true}"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:src="@drawable/icon_splash_text"></com.mooc.ppjoke.view.PPImageView>
<TextView
android:id="@+id/author_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="@dimen/dp_3"
android:text="@{feed.author.name}"
android:textColor="@{fullscreen?@color/color_white:@color/color_000}"
android:textSize="@dimen/sp_14"
android:textStyle="bold"
app:layout_constraintLeft_toRightOf="@+id/author_avatar"
app:layout_constraintTop_toTopOf="parent"
tools:text="Title"></TextView>
<TextView
android:id="@+id/create_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="@dimen/dp_2"
android:text="@{TimeUtils.calculate(feed.createTime)}"
android:textColor="@{fullscreen?@color/color_white:@color/color_000}"
android:textSize="@dimen/sp_12"
android:textStyle="normal"
app:layout_constraintLeft_toRightOf="@+id/author_avatar"
app:layout_constraintTop_toBottomOf="@+id/author_name"
tools:text="3天前"></TextView>
<com.google.android.material.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/dp_16"
android:backgroundTint="@{fullscreen?@color/transparent:@color/color_theme}"
android:gravity="center"
android:onClick="@{()->InteractionPresenter.toggleFollowUser(owner,feed)}"
android:paddingLeft="@dimen/dp_16"
android:paddingTop="@dimen/dp_5"
android:paddingRight="@dimen/dp_16"
android:paddingBottom="@dimen/dp_5"
android:text="@{feed.author.hasFollow?@string/has_follow:@string/unfollow}"
android:textColor="@color/color_white"
android:textSize="@dimen/sp_14"
app:backgroundTint="@color/color_theme"
app:cornerRadius="@dimen/dp_13"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:strokeColor="@{fullscreen?@color/color_white:@color/transparent}"
app:strokeWidth="1dp"
tools:text="已关注" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
显示效果
Presenter
package com.mooc.ppjoke.ui;
import android.app.Application;
import android.content.Context;
import android.content.DialogInterface;
import android.text.TextUtils;
import android.view.View;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.arch.core.executor.ArchTaskExecutor;
import androidx.lifecycle.LifecycleOwner;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Observer;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.mooc.libcommon.extention.LiveDataBus;
import com.mooc.libcommon.global.AppGlobals;
import com.mooc.libnetwork.ApiResponse;
import com.mooc.libnetwork.ApiService;
import com.mooc.libnetwork.JsonCallback;
import com.mooc.ppjoke.model.Comment;
import com.mooc.ppjoke.model.Feed;
import com.mooc.ppjoke.model.TagList;
import com.mooc.ppjoke.model.User;
import com.mooc.ppjoke.ui.login.UserManager;
import com.mooc.ppjoke.ui.share.ShareDialog;
import org.jetbrains.annotations.NotNull;
import java.util.Date;
public class InteractionPresenter {
//关注/取消关注一个用户
private static void toggleFollowUser(LifecycleOwner owner,User user) {
ApiService.get("/ugc/toggleUserFollow")
.addParam("followUserId", UserManager.get().getUserId())
.addParam("userId", feed.author.userId)
.execute(new JsonCallback<JSONObject>() {
@Override
public void onSuccess(ApiResponse<JSONObject> response) {
if (response.body != null) {
boolean hasFollow = response.body.getBooleanValue("hasLiked");
user.setHasFollow(hasFollow);
LiveDataBus.get().with(DATA_FROM_INTERACTION)
.postValue(feed);
}
}
@Override
public void onError(ApiResponse<JSONObject> response) {
showToast(response.message);
}
});
}
}