GridView的簡單使用
項目GitHub地址:https://github.com/leonInShanghai/IMbobo
GridView XML佈局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".controller.activity.GroupDetailActivity">
<com.hyphenate.easeui.widget.EaseTitleBar
app:titleBarTitle = "群详情"
android:layout_width = "match_parent"
android:layout_height = "wrap_content" />
<GridView
android:id="@+id/gv_groupdetail"
android:numColumns="4"
android:horizontalSpacing="10dp"
android:verticalSpacing="10dp"
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp">
</GridView>
<Button
android:id="@+id/bt_groupdetail_out"
android:background="@android:color/holo_red_light"
android:textColor="@android:color/white"
android:text="退群"
android:textSize="20sp"
android:layout_width="match_parent"
android:layout_height="60dp" />
</LinearLayout>
Activity 類:
package com.example.administrator.imbobo.controller.activity;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.content.LocalBroadcastManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.GridView;
import android.widget.Toast;
import com.example.administrator.imbobo.controller.adapter.GroupDetailAdapte;
import com.example.administrator.imbobo.R;
import com.example.administrator.imbobo.model.Model;
import com.example.administrator.imbobo.model.bean.UserInfo;
import com.example.administrator.imbobo.utils.Constant;
import com.hyphenate.chat.EMClient;
import com.hyphenate.chat.EMGroup;
import com.hyphenate.exceptions.HyphenateException;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Leon on 2018/11/24
* Functions: 群详情页面
*/
public class GroupDetailActivity extends Activity {
/**网格视图*/
private GridView gv_groupdetail;
/**退群的按钮*/
private Button bt_groupdetail_out;
/**群组类(环信easeUI定义的类*/
private EMGroup mGroup;
//群成員集合
private List<UserInfo> mUsers;
/**GridView 適配器*/
private GroupDetailAdapte groupDetailAdapte;
/**處理 增加 和刪除群成員的業務邏輯的接口*/
private GroupDetailAdapte.OnGroupDetailListener mOnGroupDetailListener = new GroupDetailAdapte.
OnGroupDetailListener() {
@Override
public void onAddMembers() {
//添加群成員-開闢子綫程做網絡請求
}
@Override
public void onDeleteMember(UserInfo user) {
//刪除群成員-開闢子綫程做網絡請求
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_grour_detail);
initView();
/**获取传递过来的环信id*/
getData();
initData();
}
private void initData(){
//初始化button显示
initButtonDisplay();
//初始化gridview
initGridView();
//從環信服務器獲取所有的群成員
getMembersFromHxServer();
}
/**從環信服務器獲取所有的群成員*/
private void getMembersFromHxServer(){
//開闢子綫程做網絡請求
Model.getInstance().getGloabalThreadPool().execute(new Runnable() {
@Override
public void run() {
try {
//從環信服務器獲取所有的群成員信息
EMGroup emGroup = EMClient.getInstance().groupManager().getGroupFromServer(mGroup.getGroupId());
List<String> menbers = emGroup.getMembers();
if (menbers != null && menbers.size() >= 0){
mUsers = new ArrayList<>();
//轉換
for (String menber : menbers){
UserInfo userInfo = new UserInfo(menber);
mUsers.add(userInfo);
}
}
//更新頁面-回到主綫程
runOnUiThread(new Runnable() {
@Override
public void run() {
//刷新適配器
groupDetailAdapte.refresh(mUsers);
}
});
} catch (final HyphenateException e) {
e.printStackTrace();
//更新頁面-回到主綫程
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(GroupDetailActivity.this,"獲取群信息失敗"+e.toString(),
Toast.LENGTH_SHORT).show();
}
});
}
}
});
}
//初始化gridview
private void initGridView(){
/**
* 群主有邀請人入群的權限
* 另外當 群組是公開的時候群成員也有邀請人的權限
*/
boolean isCanModify = EMClient.getInstance().getCurrentUser().equals(mGroup.getOwner()) ||
mGroup.isPublic();
/**
* 第一個參數是上下文
* 第二個參數是標記 是 群主/群員
*/
groupDetailAdapte = new GroupDetailAdapte(this,isCanModify,
mOnGroupDetailListener);
//GridView 設置 adapte
gv_groupdetail.setAdapter(groupDetailAdapte);
}
//初始化button显示 - 退群/解散群
private void initButtonDisplay(){
//判断当前用户是否为群组
if (EMClient.getInstance().getCurrentUser().equals(mGroup.getOwner())){//群主
bt_groupdetail_out.setText("解散群");
bt_groupdetail_out.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//开辟子线程-去环信服务器解散群
Model.getInstance().getGloabalThreadPool().execute(new Runnable() {
@Override
public void run() {
try {
//去环信服务器解散群
EMClient.getInstance().groupManager().destroyGroup(mGroup.getGroupId());
//发送一个退群的广播
exitGroupBroatCast();
//更新页面
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(GroupDetailActivity.this,"解散群成功",
Toast.LENGTH_SHORT).show();
//结束当前页面
finish();
}
});
} catch (final HyphenateException e) {
e.printStackTrace();
//更新页面
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(GroupDetailActivity.this,"解散群失败"+e.toString(),
Toast.LENGTH_SHORT).show();
}
});
}
}
});
}
});
}else {//群成员
bt_groupdetail_out.setText("退群");
bt_groupdetail_out.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//开辟子线程做服务器请求操作
Model.getInstance().getGloabalThreadPool().execute(new Runnable() {
@Override
public void run() {
try {
//告诉环信服务器群成员要退群
EMClient.getInstance().groupManager().leaveGroup(mGroup.getGroupId());
//发送一个退群的广播
exitGroupBroatCast();
//更新页面
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(GroupDetailActivity.this,"退群成功",
Toast.LENGTH_SHORT).show();
//结束当前页面
finish();
}
});
} catch (final HyphenateException e) {
e.printStackTrace();
//更新页面
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(GroupDetailActivity.this,"退群失败"+e.toString(),
Toast.LENGTH_SHORT).show();
}
});
}
}
});
}
});
}
}
/**发送退群和解散群广播*/
private void exitGroupBroatCast(){
LocalBroadcastManager mLBM = LocalBroadcastManager.getInstance(GroupDetailActivity.this);
Intent intent = new Intent(Constant.EXIT_GROUP);
intent.putExtra(Constant.GROUP_ID,mGroup.getGroupId());
mLBM.sendBroadcast(intent);
}
/**获取传递过来的数据最终得到一个 mGroup*/
private void getData(){
String groupId = getIntent().getStringExtra(Constant.GROUP_ID);
if (groupId == null){
return;
}else {
mGroup = EMClient.getInstance().groupManager().getGroup(groupId);
}
}
private void initView(){
gv_groupdetail = (GridView)findViewById(R.id.gv_groupdetail);
bt_groupdetail_out = (Button)findViewById(R.id.bt_groupdetail_out);
}
}
適配器:
package com.example.administrator.imbobo.controller.adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.administrator.imbobo.R;
import com.example.administrator.imbobo.model.bean.UserInfo;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Leon on 2018/11/25.
* Functions: GroupDetailActivity 中的 GridView 的適配器
*/
public class GroupDetailAdapte extends BaseAdapter {
private Context mContext;
/*是否允許添加和刪除群成員*/
private boolean mIsCanModify;
/**GridView 的數據源*/
private List<UserInfo> mUsers = new ArrayList<>();
/**刪除模式 true:表示可以刪除 false:表示不可以刪除*/
private boolean mIsDeleteModle;
/**自定義接口 實現添加群成員和 刪除群成員的業務邏輯*/
private OnGroupDetailListener mOnGroupDetailListener;
public GroupDetailAdapte(Context context,boolean isCanModify,OnGroupDetailListener onGroupDetailListener) {
this.mContext = context;
this.mIsCanModify = isCanModify;
this.mOnGroupDetailListener = onGroupDetailListener;
}
//刷新方法-用於刷新和傳參
public void refresh(List<UserInfo> users){
if (users != null && users.size() >= 0){
//1.清空原有的數據
mUsers.clear();
//2.添加加號和減號
initUsers();
//3.添加數據 - index:0 是爲了把加號 減號 都擠到後面
mUsers.addAll(0,users);
}
//刷新頁面
notifyDataSetChanged();
}
//添加加號和減號
private void initUsers(){
UserInfo add = new UserInfo("add");
UserInfo delete = new UserInfo("delete");
//添加 加號 和 減號讓它們在數組集合的後邊
mUsers.add(delete);
mUsers.add(0,add);
}
@Override
public int getCount() {
return mUsers == null ? 0 : mUsers.size();
}
@Override
public Object getItem(int position) {
return mUsers.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//1.獲取或創建ViewHolder
ViewHolder holder = null;
if (convertView == null){
holder = new ViewHolder();
convertView = View.inflate(mContext, R.layout.item_groupdetail,null);
holder.photo = (ImageView) convertView.findViewById(R.id.iv_group_detail_photo);
holder.delete = (ImageView)convertView.findViewById(R.id.iv_group_detatil_delete);
holder.name = (TextView)convertView.findViewById(R.id.tv_group_detail_name);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//2.獲取當前item數據
final UserInfo userInfo = mUsers.get(position);
//3.顯示數據
if (mIsCanModify){//群主 或 公開群權限裏的群成員
//佈局的處理
if (position == getCount() - 1){//減號的位置特殊處理
//刪除模式判斷
if (mIsDeleteModle){
convertView.setVisibility(View.GONE);
}else {
convertView.setVisibility(View.VISIBLE);
holder.photo.setImageResource(R.drawable.em_smiley_minus_btn);
holder.delete.setVisibility(View.GONE);
holder.name.setVisibility(View.INVISIBLE);
}
}else if (position == getCount() -2){//加號的位置特殊處理
//刪除模式判斷(增刪模式)
if (mIsDeleteModle){
convertView.setVisibility(View.GONE);
}else {
convertView.setVisibility(View.VISIBLE);
holder.photo.setImageResource(R.drawable.em_smiley_add_btn);
holder.delete.setVisibility(View.GONE);
holder.name.setVisibility(View.INVISIBLE);
}
}else {//群成員
convertView.setVisibility(View.VISIBLE);
holder.name.setVisibility(View.VISIBLE);
//名稱 由於我這裏昵稱是手機號太長,所以只顯示后四位
if (userInfo.getName() != null){
String name = userInfo.getName().substring(userInfo.getName().length()-4,userInfo.getName().length());
holder.name.setText(name);
}
holder.photo.setImageResource(R.drawable.em_default_avatar);
if (mIsDeleteModle){//刪除(增刪)模式
holder.delete.setVisibility(View.VISIBLE);
}else {//非 刪除(增刪)模式
holder.delete.setVisibility(View.GONE);
}
}
//點擊事件的處理
if (position == getCount() - 1){//減號的位置
holder.photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!mIsDeleteModle){
mIsDeleteModle = true;
notifyDataSetChanged();
}
}
});
}else if (position == getCount() - 2){//加號的位置
holder.photo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mOnGroupDetailListener.onAddMembers();
}
});
}else {//群成員的位置 delete 點擊事件的處理
holder.delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mOnGroupDetailListener.onDeleteMember(userInfo);
}
});
}
}else{//普通的群成員
if (position == getCount() - 1 || position == getCount() - 2){//減號和加號的位置隱藏掉
convertView.setVisibility(View.GONE);
}else{
convertView.setVisibility(View.VISIBLE);
//名稱 由於我這裏昵稱是手機號太長,所以只顯示后四位
if (userInfo.getName() != null){
String name = userInfo.getName().substring(userInfo.getName().length()-4,userInfo.getName().length());
holder.name.setText(name);
}
//頭像
holder.photo.setImageResource(R.drawable.em_default_avatar);
//刪除按鈕 - 普通成員沒有權力刪除和邀請群成員
holder.delete.setVisibility(View.GONE);
}
}
//4.返回View
return convertView;
}
/**内部類 ViewHolder*/
private class ViewHolder{
private ImageView photo;
private ImageView delete;
private TextView name;
}
/**自定義接口 誰實現誰處理 刪除群成員 和添加群成員的業務邏輯*/
public interface OnGroupDetailListener{
/**添加群成員方法*/
void onAddMembers();
/**刪除群成員方法*/
void onDeleteMember(UserInfo user);
}
}
Created by Leon in shanghai. Copyright © Leon. All rights reserved. 标签:GridView,void,簡單,使用,import,android,holder,public,View From: https://www.cnblogs.com/sexintercourse/p/17020530.html