Android高级控件（五）——如何打造一个企业级应用对话列表,以QQ，微信为例
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Android高级控件（五）——如何打造一个企业级应用对话列表,以QQ，微信为例
看标题这么高大上，实际上，还是运用我么拿到listview去扩展，我们讲什么呢，就是研究一下QQ，微信的这种对话列表，我们先看一个传统的ListView是怎么样的，我们做一个通讯录吧，通讯录的组成就是一个头像，一个名字，一个电话号码，一个点击拨打的按钮，既然这样，那我们的item就出来了
call_list_item.xml
<?xml version="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:gravity="center_vertical" android:orientation="horizontal"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" android:src="@mipmap/ic_launcher" /> <TextView android:id="@+id/tv_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" /> <TextView android:id="@+id/tv_number" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="3" /> <Button android:id="@+id/mCall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" /></LinearLayout>大家都知道，我们一个listview还是需要一个数据集，那我们就写一个java的实体类吧
ContentBean
package com.lgl.wechatlist.bean;import android.widget.Button;/** * 实体类 * * @author LGL */public class ContentBean { private String name; private String number; private Button mButton; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getNumber() { return number; } public void setNumber(String number) { this.number = number; } public Button getmButton() { return mButton; } public void setmButton(Button mButton) { this.mButton = mButton; }}传统的ListView，我相信大家都知道写，直接给出Adapter
ContentAdapter
package com.lgl.wechatlist.adapter;import android.content.Context;import android.content.Intent;import android.net.Uri;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.TextView;import com.lgl.wechatlist.R;import com.lgl.wechatlist.bean.ContentBean;import java.util.List;public class ContentAdapter extends BaseAdapter { private Context mContext; private List<ContentBean> mList; private LayoutInflater mInflater; private ContentBean bean; public ContentAdapter(Context mContext, List<ContentBean> mList) { this.mContext = mContext; this.mList = mList; mInflater = (LayoutInflater) mContext .getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { // TODO Auto-generated method stub return mList.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return mList.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHodler viewHodler; if (convertView == null) { viewHodler = new ViewHodler(); convertView = mInflater.inflate(R.layout.call_list_item, null); viewHodler.tv_name = (TextView) convertView .findViewById(R.id.tv_name); viewHodler.tv_number = (TextView) convertView .findViewById(R.id.tv_number); viewHodler.mCall = (Button) convertView.findViewById(R.id.mCall); convertView.setTag(viewHodler); } else { viewHodler = (ViewHodler) convertView.getTag(); } bean = mList.get(position); viewHodler.tv_name.setText(bean.getName()); viewHodler.tv_number.setText(bean.getNumber()); viewHodler.mCall.setText("拨打"); viewHodler.mCall.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Call(bean.getNumber()); } }); return convertView; } class ViewHodler { private TextView tv_name; private TextView tv_number; private Button mCall; } /** * 拨打电话 * * @param phone */ public void Call(String phone) { Intent intent = new Intent(); intent.setAction("android.intent.action.CALL"); intent.addCategory("android.intent.category.DEFAULT"); intent.setData(Uri.parse("tel:"+phone)); mContext.startActivity(intent); }}当然，还需要在我们的主类中获取数据
package com.lgl.listview;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.database.Cursor;import android.os.Bundle;import android.provider.ContactsContract;import android.widget.ListView;public class MainActivity extends Activity { private ListView mListView; // 联系人集合 private List<String> contentName = new ArrayList<String>(); // 号码集合 private List<String> contentPhone = new ArrayList<String>(); private List<ContentBean> list = new ArrayList<ContentBean>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); getContent(); mListView = (ListView) findViewById(R.id.mListView); for (int i = 0; i < contentName.size(); i++) { ContentBean bean = new ContentBean(); bean.setName(contentName.get(i)); bean.setNumber(contentPhone.get(i)); list.add(bean); } ContentAdapter adapter = new ContentAdapter(this, list); mListView.setAdapter(adapter); } /** * 获取联系人 */ private void getContent() { Cursor query = getContentResolver().query( ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null); // 创建一个对象进行储存 String name; // 联系人 String phone; // 电话号码 // 我们获取到这些信息之后遍历出来 while (query.moveToNext()) { // 获取名字就需要Phone.DISPLAY_NAME name = query .getString(query .getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)); // 获取num字段需要Phone.NUMBER phone = query .getString(query .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); contentName.add(name); contentPhone.add(phone); } }}这样，一个简易的通讯录就做好了
OK，这个没什么问题，但是我们今天要讨论的，是一个对话的ListView,这在我们之前看的群英传一书中也提到过Android群英传笔记——第四章：ListView使用技巧,但是讲的不是很详细，我们这里就多讲一下了，我们要区分左右，也就是type，需要用到getViewTypeCount（）和getItemViewType（）方法， 根据数据源的position返回需要显示的的layout的type，那我们从易到难，先写一个简单点的，就一个简单的文字对话框，怎么实现呢？我们当然得先定义left和right的item布局了
chatlist_left.xml
<?xml version="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:gravity="bottom" android:orientation="horizontal" android:padding="10dp"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:src="@mipmap/ic_launcher" /> <TextView android:id="@+id/chatlist_tv_left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:background="@drawable/pop_left" android:gravity="center" android:padding="20dp" /></LinearLayout>chatlist_right.xml
<?xml version="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:gravity="right|bottom" android:orientation="horizontal" android:padding="10dp"> <TextView android:id="@+id/chatlist_tv_right" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="20dp" android:background="@drawable/pop_right" android:gravity="center" android:padding="20dp" /> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="20dp" android:src="@mipmap/ic_launcher" /></LinearLayout>OK，别忘了这是一个新的listview，所以我们还得写一个实体类
ChatListBean
package com.lgl.wechatlist.bean;/** * 对话实体类 * * @author LGL * */public class ChatListBean { // 指定方向 private int type; // 文本 private String value; public int getType() { return type; } public void setType(int type) { this.type = type; } public String getValue() { return value; } public void setValue(String value) { this.value = value; }}这样就对我们的adapter进行分析了
ChatListAdapter
package com.lgl.wechatlist.adapter;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;import com.lgl.wechatlist.R;import com.lgl.wechatlist.bean.ChatListBean;import java.util.List;/** * 对话ListView */public class ChatListAdapter extends BaseAdapter { public static final String KEY = "key"; public static final String VALUE = "value"; public static final int VALUE_LEFT_TEXT = 1; public static final int VALUE_RIGHT_TEXT = 2; private LayoutInflater mInflater; private List<ChatListBean> myList; public ChatListAdapter(Context context, List<ChatListBean> myList) { this.myList = myList; mInflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { return myList.size(); } @Override public Object getItem(int arg0) { return myList.get(arg0); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View convertView, ViewGroup arg2) { ChatListBean msg = myList.get(position); int type = getItemViewType(position); ViewHolderRightText holderRightText = null; ViewHolderLeftText holderLeftText = null; if (convertView == null) { switch (type) { // 左边 case VALUE_LEFT_TEXT: holderLeftText = new ViewHolderLeftText(); convertView = mInflater.inflate(R.layout.chatlist_left, null); holderLeftText.btnLeftText = (TextView) convertView .findViewById(R.id.chatlist_tv_left); holderLeftText.btnLeftText.setText(msg.getValue()); convertView.setTag(holderLeftText); break; // 右边 case VALUE_RIGHT_TEXT: holderRightText = new ViewHolderRightText(); convertView = mInflater.inflate(R.layout.chatlist_right, null); holderRightText.btnRightText = (TextView) convertView .findViewById(R.id.chatlist_tv_right); holderRightText.btnRightText.setText(msg.getValue()); convertView.setTag(holderRightText); break; } } else { switch (type) { case VALUE_LEFT_TEXT: holderLeftText = (ViewHolderLeftText) convertView.getTag(); holderLeftText.btnLeftText.setText(msg.getValue()); break; case VALUE_RIGHT_TEXT: holderRightText = (ViewHolderRightText) convertView.getTag(); holderRightText.btnRightText.setText(msg.getValue()); break; } } return convertView; } /** * 根据数据源的position返回需要显示的的layout的type * <p/> * type的值必须从0开始 */ @Override public int getItemViewType(int position) { ChatListBean msg = myList.get(position); int type = msg.getType(); return type; } /** * 返回所有的layout的数量 */ @Override public int getViewTypeCount() { return 7; } // 左边的文本 class ViewHolderLeftText { private TextView btnLeftText; } // 右边的文本 class ViewHolderRightText { private TextView btnRightText; }}我们去主类中写点数据
package com.lgl.wechatlist;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.ListView;import com.lgl.wechatlist.adapter.ChatListAdapter;import com.lgl.wechatlist.bean.ChatListBean;import java.util.ArrayList;import java.util.List;/** * Created by LGL on 2016/5/7. */public class QQActivity extends AppCompatActivity implements View.OnClickListener{ // 会话数据源 private List<ChatListBean> ListData; // 会话Adapter private ChatListAdapter chatListAdapter; // 会话列表 private ListView mListView; // 消息 private String message; // 按钮 private Button btn_left, btn_right; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_qq); mListView = (ListView) findViewById(R.id.mListView); btn_left = (Button) findViewById(R.id.btn_left); btn_left.setOnClickListener(this); btn_right = (Button) findViewById(R.id.btn_right); btn_right.setOnClickListener(this); ListData = new ArrayList<ChatListBean>(); ChatListBean chatListBean = new ChatListBean(); chatListBean.setType(ChatListAdapter.VALUE_LEFT_TEXT); chatListBean.setValue("你好！"); ListData.add(chatListBean); chatListAdapter = new ChatListAdapter(this, ListData); mListView.setAdapter(chatListAdapter); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_left: listLeft("left"); break; case R.id.btn_right: listRight("right"); break; } } /** * 显示列表左边 * * @param text */ private void listLeft(String text) { ChatListBean left = new ChatListBean(); left.setType(ChatListAdapter.VALUE_LEFT_TEXT); left.setValue(text); ListData.add(left); chatListAdapter.notifyDataSetChanged(); // 滚动到最底部 mListView.setSelection(mListView.getBottom()); } /** * 显示右边列表 * * @param text */ private void listRight(String text) { ChatListBean right = new ChatListBean(); right.setType(ChatListAdapter.VALUE_RIGHT_TEXT); right.setValue(text); ListData.add(right); chatListAdapter.notifyDataSetChanged(); // 滚动到最底部 mListView.setSelection(mListView.getBottom()); }}好的运行一下
到这里，我们就对这个技巧有点熟悉了吧，既然如此，那我们即系，现在我们有6个item，分别是文字左右，图片左右，语言左右，这里就不贴出来了，要看的直接去Demo里面找哟，也没多少东西，就几个文本布局而已，我们直接来看实体类
MessageBean
package com.lgl.wechatlist.bean;public class MessageBean { private int type;//指定是哪种类型 private String value;//值 public int getType() { return type; } public void setType(int type) { this.type = type; } public String getValue() { return value; } public void setValue(String value) { this.value = value; }}你一看，和上次那个没什么不同，对的，是没什么不同，只不过代码多了一点而已，这样的话，我们可以看Adapter了
package com.lgl.wechatlist.adapter;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ImageView;import android.widget.TextView;import com.lgl.wechatlist.R;import com.lgl.wechatlist.bean.MessageBean;import java.util.List;/** * 比原来的多了getItemViewType和getViewTypeCount这两个方法， * * */public class WechatAdapter extends BaseAdapter { public static final String KEY = "key"; public static final String VALUE = "value"; public static final int VALUE_LEFT_TEXT = 1; public static final int VALUE_LEFT_IMAGE = 2; public static final int VALUE_LEFT_AUDIO = 3; public static final int VALUE_RIGHT_TEXT = 4; public static final int VALUE_RIGHT_IMAGE = 5; public static final int VALUE_RIGHT_AUDIO = 6; private LayoutInflater mInflater; private List<MessageBean> myList; public WechatAdapter(Context context, List<MessageBean> myList) { this.myList = myList; mInflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { return myList.size(); } @Override public Object getItem(int arg0) { return myList.get(arg0); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View convertView, ViewGroup arg2) { MessageBean msg = myList.get(position); int type = getItemViewType(position); ViewHolderRightText holderRightText = null; ViewHolderRightImg holderRightImg = null; ViewHolderRightAudio holderRightAudio = null; ViewHolderLeftText holderLeftText = null; ViewHolderLeftImg holderLeftImg = null; ViewHolderLeftAudio holderLeftAudio = null; if (convertView == null) { switch (type) { // 左边 case VALUE_LEFT_TEXT: holderLeftText = new ViewHolderLeftText(); convertView = mInflater.inflate(R.layout.list_item_left_text, null); holderLeftText.ivLeftIcon = (ImageView) convertView .findViewById(R.id.iv_icon); holderLeftText.btnLeftText = (Button) convertView .findViewById(R.id.btn_left_text); holderLeftText.btnLeftText.setText(msg.getValue()); convertView.setTag(holderLeftText); break; case VALUE_LEFT_IMAGE: holderLeftImg = new ViewHolderLeftImg(); convertView = mInflater.inflate(R.layout.list_item_left_iamge, null); holderLeftImg.ivLeftIcon = (ImageView) convertView .findViewById(R.id.iv_icon); holderLeftImg.ivLeftImage = (ImageView) convertView .findViewById(R.id.iv_left_image); holderLeftImg.ivLeftImage.setImageResource(R.mipmap.ic_launcher); convertView.setTag(holderLeftImg); break; case VALUE_LEFT_AUDIO: holderLeftAudio = new ViewHolderLeftAudio(); convertView = mInflater.inflate(R.layout.list_item_left_audio, null); holderLeftAudio.ivLeftIcon = (ImageView) convertView .findViewById(R.id.iv_icon); holderLeftAudio.btnLeftAudio = (Button) convertView .findViewById(R.id.btn_left_audio); holderLeftAudio.tvLeftAudioTime = (TextView) convertView .findViewById(R.id.tv_left_audio_time); holderLeftAudio.tvLeftAudioTime.setText(msg.getValue()); convertView.setTag(holderLeftAudio); break; // 右边 case VALUE_RIGHT_TEXT: holderRightText= new ViewHolderRightText(); convertView = mInflater.inflate(R.layout.list_item_right_text, null); holderRightText.ivRightIcon = (ImageView) convertView .findViewById(R.id.iv_icon); holderRightText.btnRightText = (Button) convertView .findViewById(R.id.btn_right_text); holderRightText.btnRightText.setText(msg.getValue()); convertView.setTag(holderRightText); break; case VALUE_RIGHT_IMAGE: holderRightImg= new ViewHolderRightImg(); convertView = mInflater.inflate(R.layout.list_item_right_iamge, null); holderRightImg.ivRightIcon = (ImageView) convertView .findViewById(R.id.iv_icon); holderRightImg.ivRightImage = (ImageView) convertView .findViewById(R.id.iv_right_image); holderRightImg.ivRightImage.setImageResource(R.mipmap.ic_launcher); convertView.setTag(holderRightImg); break; case VALUE_RIGHT_AUDIO: holderRightAudio=new ViewHolderRightAudio(); convertView = mInflater.inflate(R.layout.list_item_right_audio, null); holderRightAudio.ivRightIcon = (ImageView) convertView .findViewById(R.id.iv_icon); holderRightAudio.btnRightAudio = (Button) convertView .findViewById(R.id.btn_right_audio); holderRightAudio.tvRightAudioTime = (TextView) convertView .findViewById(R.id.tv_right_audio_time); holderRightAudio.tvRightAudioTime.setText(msg.getValue()); convertView.setTag(holderRightAudio); break; default: break; } } else { switch (type) { case VALUE_LEFT_TEXT: holderLeftText=(ViewHolderLeftText)convertView.getTag(); holderLeftText.btnLeftText.setText(msg.getValue()); break; case VALUE_LEFT_IMAGE: holderLeftImg=(ViewHolderLeftImg)convertView.getTag(); holderLeftImg.ivLeftImage.setImageResource(R.mipmap.ic_launcher); break; case VALUE_LEFT_AUDIO: holderLeftAudio=(ViewHolderLeftAudio)convertView.getTag(); holderLeftAudio.tvLeftAudioTime.setText(msg.getValue()); break; case VALUE_RIGHT_TEXT: holderRightText=(ViewHolderRightText)convertView.getTag(); holderRightText.btnRightText.setText(msg.getValue()); break; case VALUE_RIGHT_IMAGE: holderRightImg=(ViewHolderRightImg)convertView.getTag(); holderRightImg.ivRightImage.setImageResource(R.mipmap.ic_launcher); break; case VALUE_RIGHT_AUDIO: holderRightAudio=(ViewHolderRightAudio)convertView.getTag(); holderRightAudio.tvRightAudioTime.setText(msg.getValue()); break; default: break; } //holder = (ViewHolder) convertView.getTag(); } return convertView; } /** * 根据数据源的position返回需要显示的的layout的type * * type的值必须从0开始 * * */ @Override public int getItemViewType(int position) { MessageBean msg = myList.get(position); int type = msg.getType(); return type; } /** * 返回所有的layout的数量 * * */ @Override public int getViewTypeCount() { return 7; } class ViewHolderRightText { private ImageView ivRightIcon;// 右边的头像 private Button btnRightText;// 右边的文本 } class ViewHolderRightImg { private ImageView ivRightIcon;// 右边的头像 private ImageView ivRightImage;// 右边的图像 } class ViewHolderRightAudio { private ImageView ivRightIcon;// 右边的头像 private Button btnRightAudio;// 右边的声音 private TextView tvRightAudioTime;// 右边的声音时间 } class ViewHolderLeftText { private ImageView ivLeftIcon;// 左边的头像 private Button btnLeftText;// 左边的文本 } class ViewHolderLeftImg { private ImageView ivLeftIcon;// 左边的头像 private ImageView ivLeftImage;// 左边的图像 } class ViewHolderLeftAudio { private ImageView ivLeftIcon;// 左边的头像 private Button btnLeftAudio;// 左边的声音 private TextView tvLeftAudioTime;// 左边的声音时间 }}OK，代码清晰可见
我们的主类
package com.lgl.wechatlist;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.ListView;import com.lgl.wechatlist.adapter.WechatAdapter;import com.lgl.wechatlist.bean.MessageBean;import java.util.ArrayList;import java.util.List;public class WechatActivity extends AppCompatActivity { private ListView lvData; private List<MessageBean> msgList; private MessageBean msg; private WechatAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_wechat); lvData = (ListView) findViewById(R.id.lv_data); msgList = new ArrayList<MessageBean>(); adapter = new WechatAdapter(WechatActivity.this, msgList); lvData.setAdapter(adapter); } /** * 左边文字 * * @param v */ public void tv_left(View v) { MessageBean msg = new MessageBean(); msg.setType(WechatAdapter.VALUE_LEFT_TEXT); msg.setValue("我是文字左"); msgList.add(msg); adapter.notifyDataSetChanged(); //滑动到底部 lvData.setSelection(lvData.getBottom()); } /** * 右边文字 * * @param v */ public void tv_right(View v) { MessageBean msg = new MessageBean(); msg.setType(WechatAdapter.VALUE_RIGHT_TEXT); msg.setValue("我是文字右"); msgList.add(msg); adapter.notifyDataSetChanged(); //滑动到底部 lvData.setSelection(lvData.getBottom()); } /** * 左边图片 * * @param v */ public void iv_left(View v) { MessageBean msg = new MessageBean(); msg.setType(WechatAdapter.VALUE_LEFT_IMAGE); msg.setValue("我是图片左"); msgList.add(msg); adapter.notifyDataSetChanged(); //滑动到底部 lvData.setSelection(lvData.getBottom()); } /** * 右边图片 * * @param v */ public void iv_right(View v) { msg = new MessageBean(); msg.setType(WechatAdapter.VALUE_RIGHT_IMAGE); msg.setValue("我是图片右"); msgList.add(msg); adapter.notifyDataSetChanged(); //滑动到底部 lvData.setSelection(lvData.getBottom()); } /** * 左边语音 * * @param v */ public void iv_left_audio(View v) { msg = new MessageBean(); msg.setType(WechatAdapter.VALUE_LEFT_AUDIO); msg.setValue("16s"); msgList.add(msg); adapter.notifyDataSetChanged(); //滑动到底部 lvData.setSelection(lvData.getBottom()); } /** * 右边语音 * * @param v */ public void iv_right_audio(View v) { msg = new MessageBean(); msg.setType(WechatAdapter.VALUE_RIGHT_AUDIO); msg.setValue("6s"); msgList.add(msg); adapter.notifyDataSetChanged(); //滑动到底部 lvData.setSelection(lvData.getBottom()); }}那这样的话，我们运行一下
行，我们是不是已经有了大致的了解，我Demo也理得比较顺，要是看的不是很懂可以结合Demo来
Demo下载地址：http://download.csdn.net/detail/qq_26787115/9512985
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