Android利用GridView实现单选功能

先看看gridview实现单选效果

如果是你需要的,你可以继续往下看了

实现起来比较简单,直接上代码

主activity的布局,一个button用来跳转到筛选activity一个textview用来显示筛选后的到的结果

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.duanlian.gridviewsingleselectordomo.mainactivity">

 <button
  android:layout_width="match_parent"
  android:layout_height="50dp"
  android:onclick="buttonclick"
  android:text="去筛选"/>

 <textview
  android:id="@+id/tv_result"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:textsize="30dp"
  android:textcolor="@color/coloraccent"
  android:layout_centerinparent="true"
  android:text="筛选结果"/>
</relativelayout>

mainactivity你的代码逻辑,注释已经加上

package com.duanlian.gridviewsingleselectordomo;

import android.content.intent;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.textview;

public class mainactivity extends appcompatactivity {
 private textview mtextview;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  mtextview = (textview) findviewbyid(r.id.tv_result);
 }

 /**
  * button的点击监听
  * @param view
  */
 public void buttonclick(view view) {
  //跳转到筛选的activity
  intent intent = new intent(mainactivity.this, singleselectoractivity.class);
  //通过带返回值的跳转来的到下一个页面带过来的值
  startactivityforresult(intent,888);
 }

 @override
 protected void onactivityresult(int requestcode, int resultcode, intent data) {
  super.onactivityresult(requestcode, resultcode, data);
  if (requestcode == 888 && resultcode == 999) {
   //拿到上一个页面finish后带过来的值
   string pos = data.getstringextra("pos");
   mtextview.settext(pos);
  }


 }
}

然后就是筛选activity,布局就一个gridview用来显示待选项,
一个button用来点击返回主activity并且把选择的值带过去

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_single_selector"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.duanlian.gridviewsingleselectordomo.singleselectoractivity">
<button
 android:id="@+id/button"
 android:layout_width="match_parent"
 android:layout_height="50dp"
 android:onclick="buttonfinish"
 android:text="选择完成"/>
 <gridview
  android:id="@+id/gridview"
  android:layout_below="@+id/button"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:columnwidth="80dp"
  android:horizontalspacing="5dp"
  android:verticalspacing="10dp"
  android:numcolumns="auto_fit"/>
</relativelayout>

然后就是筛选逻辑

package com.duanlian.gridviewsingleselectordomo;

import android.content.intent;
import android.os.bundle;
import android.support.v7.app.appcompatactivity;
import android.view.view;
import android.widget.adapterview;
import android.widget.gridview;

import java.util.arraylist;
import java.util.list;

public class singleselectoractivity extends appcompatactivity {

 private gridview mgridview;
 private list<string> mlist;
 private gridviewadapter madapter;
 int selectorposition = 0;

 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_single_selector);
  initview();
 }

 private void initview() {
  mgridview = (gridview) findviewbyid(r.id.gridview);
  //添加数据
  mlist = new arraylist<>();
  for (int i = 0; i < 100; i++) {
   mlist.add("第 " + i + " 个");
  }
  madapter = new gridviewadapter(this, mlist);
  mgridview.setadapter(madapter);
  //gridview的点击事件
  mgridview.setonitemclicklistener(new adapterview.onitemclicklistener() {
   @override
   public void onitemclick(adapterview<?> parent, view view, int position, long id) {
    //把点击的position传递到adapter里面去
    madapter.changestate(position);
    selectorposition = position;
   }
  });
 }

 /**
  * button的点击监听
  *
  * @param view
  */
 public void buttonfinish(view view) {
  intent intent = new intent();
  intent.putextra("pos", "第 " + selectorposition + " 个");
  setresult(999, intent);
  finish();
 }
}

主要的状态改变还是在adapter里面

package com.duanlian.gridviewsingleselectordomo;

import android.content.context;
import android.graphics.color;
import android.view.view;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.relativelayout;
import android.widget.textview;

import java.util.list;

/**
 * gridview的adapter
 */

public class gridviewadapter extends baseadapter {
 private context mcontext;
 private list<string> mlist;
 private int selectorposition;

 public gridviewadapter(context context, list<string> mlist) {
  this.mcontext = context;
  this.mlist = mlist;

 }

 @override
 public int getcount() {
  return mlist != null ? mlist.size() : 0;
 }

 @override
 public object getitem(int position) {
  return mlist != null ? mlist.get(position) : null;
 }

 @override
 public long getitemid(int position) {
  return mlist != null ? position : 0;
 }

 @override
 public view getview(int position, view convertview, viewgroup parent) {
  convertview = view.inflate(mcontext, r.layout.item_gridview, null);
  relativelayout mrelativelayout = (relativelayout) convertview.findviewbyid(r.id.ll);
  textview textview = (textview) convertview.findviewbyid(r.id.tv);
  textview.settext(mlist.get(position));
  //如果当前的position等于传过来点击的position,就去改变他的状态
  if (selectorposition == position) {
   mrelativelayout.setbackgroundresource(r.drawable.grid_shap_two);
   textview.settextcolor(color.parsecolor("#ff4081"));
  } else {
   //其他的恢复原来的状态
   mrelativelayout.setbackgroundresource(r.drawable.grid_shap_one);
   textview.settextcolor(color.parsecolor("#3f51b5"));
  }
  return convertview;
 }


 public void changestate(int pos) {
  selectorposition = pos;
  notifydatasetchanged();

 }
}

还有item布局

<?xml version="1.0" encoding="utf-8"?>
<relativelayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 >

 <relativelayout
  android:id="@+id/ll"
  android:layout_width="100dp"
  android:layout_height="32dp"
  android:layout_centerinparent="true"
  android:layout_margin="5dp"
  android:background="@drawable/grid_shap_one"
  >

  <textview
   android:id="@+id/tv"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:layout_centerhorizontal="true"
   android:ellipsize="none"
   android:gravity="center"
   android:singleline="true"
   android:text="英超"
   android:maxlength="7"
   android:textcolor="@color/colorprimary"
   android:textsize="13sp"/>
 </relativelayout>
</relativelayout>

如果你想点击跳转到筛选activity且待筛选的按钮中,显示你之前选择后的那个按钮状态是选中状态,其实也很简单,只要你把你选中后的position缓存下来,点进去到筛选activity,实例化adapter后调用 madapter.changestate(position);把你需要改变状态的按钮的position传递过去就行了

其他的小细节请下载demo

点击下载demo

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。