最近这段时间一直在看Android，利用Listview去实现点赞功能
基本思路：
进入界面–》获取数据–》
在Listview中显示–》
通过map集合（position,boolean）保存每一行是否被点击–》
利用实体类去保存相应的对象–》
get/set方法进行相应值得改变–》
点击一次，相应的数量加1
只实现了点赞功能，踩和赞基本类似。
具体实现如下：
继承自BaseAdapter
package com.gz.test_listview; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * Created by gz on 2016/11/9. */ public class MainActivityAdapter extends BaseAdapter{ //用来获取界面上的元素 private ViewHolder holder; private Context context; //这里的Bean是个测试用的内部类，将点赞数和踩得数存起来，可以定义一个类， //直接获取数据就好，需要改进下 private List<Bean> praise_step_num = new ArrayList<Bean>(); private LayoutInflater inflater; //保存当前点赞数 List<Map<String,Object>> listItems; /* 根据position，保存点击的是哪一行数据，默认为false，点击后改为true */ private Map<Integer, Boolean> isExist = new HashMap<Integer, Boolean>(); public MainActivityAdapter(Context context,List<Map<String,Object>> listItems){ this.context = context; this.listItems = listItems; inflater = LayoutInflater.from(context); Log.i("listItem",listItems.toString()); init(); } private void init() { /* 为相应的数据赋值，所有的数据存储在listItems中 position一一对应每一行数据 */ for (int i = 0;i<listItems.size();i++){ isExist.put(i,false); Bean b = new Bean(); Integer praise = Integer.parseInt(listItems.get(i).get("praise").toString()); b.setPraise(praise); Integer step = Integer.parseInt(listItems.get(i).get("step").toString()); b.setStep(step); praise_step_num.add(i,b); Log.i("praise_step",praise_step_num.get(i).getPraise()+""); } } @Override public int getCount() { return listItems.size() ; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { //获取赞、踩得值 final Bean bean = praise_step_num.get(position); if(convertView == null){ holder = new ViewHolder(); convertView = inflater.inflate(R.layout.item_praise,null); holder.img_praise = (ImageView) convertView.findViewById(R.id.tv_praises_img); holder.img_step = (ImageView) convertView.findViewById(R.id.tv_step_img); holder.praise = (TextView) convertView.findViewById(R.id.tv_praises); holder.step = (TextView) convertView.findViewById(R.id.tv_step); holder.title = (TextView) convertView.findViewById(R.id.tv_name); //holder.img_step.setImageResource(R.drawable.bad); convertView.setTag(holder); }else{ holder = (ViewHolder) convertView.getTag(); } holder.praise.setText(bean.getPraise()+""); holder.step.setText(bean.getStep()+""); holder.title.setText(listItems.get(position).get("title")+""); /* 每次会复用convertView, convertView没有被赋值，就会使用之后赋值的数据， 比如：点击了第一行数据赞的按钮，相应的第一行点赞图片变为红色 当向下滑动页面时，下方的也会有一项数据发生变化，复用 在这里为每次重用赋值 */ if(bean.getPraise()!=0){ holder.img_praise.setImageResource(R.drawable.good); }else{ holder.img_praise.setImageResource(R.drawable.good_no); } if(bean.getStep()!=0){ holder.img_step.setImageResource(R.drawable.bad); }else{ holder.img_step.setImageResource(R.drawable.bad_no); } holder.img_praise.setOnClickListener(new imgClick(position,bean)); return convertView; } class imgClick implements View.OnClickListener { private int position; private Bean bean; public imgClick(int position,Bean bean){ this.position = position; this.bean = bean; } @Override public void onClick(final View v) { Log.i("position",position+""); if(bean.getPraise()==0){ if(isExist.get(position) == false){ final Handler handler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what){ case 1: ImageView btn = (ImageView) v; if(v.getId() == btn.getId()) { isExist.put(position, true); bean.setPraise(bean.getPraise()+1); btn.setImageResource(R.drawable.good); AnimationTools.scale(btn); notifyDataSetChanged(); break; } case 2: Toast.makeText(context, "失败", Toast.LENGTH_LONG).show(); break; } } }; new Thread(){ @Override public void run() { Message msg = new Message(); msg.what=1; handler.sendMessage(msg); } }.start(); } }else{ Toast.makeText(context, "已经点击过", Toast.LENGTH_LONG).show(); } } } private static class ViewHolder{ public ImageView img_praise; public ImageView getImg_praise() { return img_praise; } public ImageView getImg_step() { return img_step; } public TextView getPraise() { return praise; } public TextView getStep() { return step; } public TextView getTitle() { return title; } private ImageView img_step; public TextView praise; private TextView step; private TextView title; } class Bean{ public int getPraise() { return praise; } public void setPraise(int praise) { this.praise = praise; } public int getStep() { return step; } public void setStep(int step) { this.step = step; } private int praise; private int step; } }
MainActivity
进行Listview值赋值，然后进行和Adapter的绑定
package com.gz.test_listview; import android.app.Activity; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Objects; public class MainActivity extends Activity { private ListView listview; private String[] title = {"商用","家用","测试","多联","空气能","商用","家用","测试","多联","空气能"}; private String[] praise = {"3","1","0","0","0","3","1","0","0","0"}; private String[] step = {"3","0","0","0","0","3","0","0","0","0"}; private ArrayList<Map<String,Object>> map = new ArrayList<Map<String, Object>>(); private ListView listView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listview = (ListView) findViewById(R.id.listview); for(int i=0;i<title.length;i++){ Map<String,Object> item = new HashMap<String,Object>(); item.put("title",title[i]); item.put("praise",praise[i]); item.put("step",step[i]); map.add(item); } MainActivityAdapter adapter = new MainActivityAdapter(this,map); listview.setAdapter(adapter); listview.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Intent intent = new Intent(MainActivity.this,DetailActivity.class); startActivity(intent); } }); } }
跳转界面，测试用
package com.gz.test_listview; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; import java.util.ArrayList; import java.util.HashMap; import java.util.Map; public class DetailActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.detail_info); } }
简单的动画效果的实现
直接用就好了
package com.gz.test_listview; import android.view.View; import android.view.animation.Animation; import android.view.animation.ScaleAnimation; public class AnimationTools { public static void scale(View v) { ScaleAnimation anim = new ScaleAnimation(1.0f, 1.5f, 1.0f, 1.5f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); anim.setDuration(300); v.startAnimation(anim); } }
界面
<"1.0" encoding="utf-8"?> <RelativeLayout 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" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.gz.test_listview.MainActivity"> <ListView android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="wrap_content"> </ListView> </RelativeLayout>
Listview子项
<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/lyt_root" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#ccc" android:orientation="vertical" android:descendantFocusability= "blocksDescendants" > <FrameLayout android:layout_width="fill_parent" android:layout_height="wrap_content" > <ImageView android:id="@+id/has_exame" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="top|left" /> <LinearLayout android:layout_margin="10dip" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:background="@drawable/corners" android:layout_weight="1.0" android:orientation="vertical" > <TextView android:id="@+id/tv_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="14sp" android:text="商用多联机" android:textColor="#000" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:id="@+id/tv_date" android:layout_marginTop="10dip" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="12sp" android:text="时间 2016-10-10" android:textColor="#000" android:visibility="visible" /> <TextView android:id="@+id/tv_downloads" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_weight="1" android:textColor="#000" android:textSize="14sp" android:visibility="gone" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" android:gravity="center|right" > <ImageView android:id="@+id/tv_praises_img" android:layout_width="30dip" android:layout_height="30dip" android:background="@drawable/good_no" android:layout_marginRight="5dip" /> <TextView android:id="@+id/tv_praises" android:layout_width="50dip" android:layout_height="wrap_content" android:textColor="#000" android:text="10" android:textSize="14dip" android:layout_gravity="center" /> <ImageView android:id="@+id/tv_step_img" android:layout_width="30dip" android:layout_height="30dip" android:background="@drawable/bad_no" android:layout_marginRight="5dip" /> <TextView android:id="@+id/tv_step" android:layout_width="50dip" android:layout_height="wrap_content" android:textColor="#000" android:text="10" android:textSize="14dip" android:layout_gravity="center" /> </LinearLayout> </LinearLayout> </FrameLayout> </LinearLayout>
点击item后进入的界面
<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" android:orientation="vertical" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="111" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="111" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="111" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="111" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="111" /> </LinearLayout>
代码中是我对程序的理解，有的地方可能不是很明白，还得完善完善
这篇文章给了我很大帮助，动画效果就是搬过来的，哈哈，很不错，学习了。
参考文章：http://www.jb51.net/article/97335.htm
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。
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