Android 自定义适配器无法正常用于聊天列表视图
Posted
技术标签:
【中文标题】Android 自定义适配器无法正常用于聊天列表视图【英文标题】：Android custom adapter not working properly for chat listview 【发布时间】：2015-09-09 01:55:30 【问题描述】：大家好，我是安卓新手。我正在开发聊天应用程序，现在我遇到了自定义适配器的问题。它与文本聊天完美配合，但是当我在列表视图中加载图像时，它会出现问题。问题是，当我滚动聊天 2-3 次时，图像覆盖为文本。我已经用日志检查了我的所有代码，它只显示特定位置的一次图像实现，但在列表视图中它随机显示图像。我尝试了更多谷歌和相关问题，但没有任何帮助。
当我加载第一次聊天时在这里..它的 show
当我滚动时，有时它会在每次文字聊天时显示图像。
谁能帮帮我。plz。谢谢。
这是我的适配器：
public class ChatMainAdapter extends BaseAdapter
private static final int TYPE_ITEM_ME = 0;
private static final int TYPE_ITEM_OTHER = 1;
private Context context;
private ArrayList < ChatMessageLocalDBModel > arrayList;
private static String currentUserObjectId;
private Bitmap myBimap, UserBitmap;
public ChatMainAdapter(Context context, ArrayList < ChatMessageLocalDBModel > arrayList, String currentUserObjectId, Bitmap userBitmap, Bitmap myBimap)
this.context = context;
this.arrayList = arrayList;
this.currentUserObjectId = currentUserObjectId;
this.UserBitmap = userBitmap;
this.myBimap = myBimap;
@Override
public int getCount()
return arrayList.size();
@Override
public Object getItem(int position)
return position;
@Override
public long getItemId(int position)
return position;
@Override
public int getItemViewType(int position)
String isMe = arrayList.get(position).getFrom();
return isMe.equalsIgnoreCase(currentUserObjectId) ? TYPE_ITEM_ME : TYPE_ITEM_OTHER;
@Override
public int getViewTypeCount()
return 2;
@Override
public View getView(final int position, View convertView, ViewGroup parent)
ViewHolder holder = null;
final int type;
type = getItemViewType(position);
if (convertView == null)
holder = new ViewHolder();
switch (type)
case TYPE_ITEM_ME:
convertView = LayoutInflater.from(context).inflate(
R.layout.chat_listview_item_me, null);
holder.imgViewUserPic = (ImageView) convertView.findViewById(R.id.chat_item_ivProfileMe);
holder.body = (TextView) convertView.findViewById(R.id.chat_item_tv_me_message);
holder.time = (TextView) convertView.findViewById(R.id.chat_item_tv_me_time);
holder.llyPic = (LinearLayout) convertView.findViewById(R.id.chat_lly_image);
holder.llyPic.setBackgroundResource(0);
holder.body.setTextIsSelectable(true);
break;
case TYPE_ITEM_OTHER:
convertView = LayoutInflater.from(context).inflate(
R.layout.chat_listview_item_other, null);
holder.imgViewUserPic = (ImageView) convertView.findViewById(R.id.chat_item_ivProfileOther);
holder.body = (TextView) convertView.findViewById(R.id.chat_item_tv_other_message);
holder.time = (TextView) convertView.findViewById(R.id.chat_item_tv_other_time);
holder.body.setTextIsSelectable(true);
break;
convertView.setTag(holder);
else
holder = (ViewHolder) convertView.getTag();
Log.i("NPath", "" + "Pos:" + position + " :- " + arrayList.get(position).getPath());
if (arrayList.get(position).getPath().equalsIgnoreCase("NO IMAGE"))
holder.body.setText(arrayList.get(position).getMessage());
holder.time.setText(arrayList.get(position).getTime());
Log.i("NPath", "pos:" + position + "" + "is text and is : " + arrayList.get(position).getMessage() + "" + type);
else
Log.i("NPath", "pos:" + position + "" + "is image:" + type);
holder.body.setVisibility(View.GONE);
holder.time.setVisibility(View.GONE);
File path = new File("" + arrayList.get(position).getPath());
if (path.exists())
Bitmap mBitmap = BitmapFactory.decodeFile(arrayList.get(position).getPath());
final BitmapDrawable background = new BitmapDrawable(mBitmap);
holder.llyPic.setVisibility(View.VISIBLE);
holder.llyPic.setBackgroundDrawable(background);
else
convertView.setVisibility(View.GONE);
Log.e("NFILENOEXICST", "No file exist");
if (type == TYPE_ITEM_ME)
holder.imgViewUserPic.setImageBitmap(myBimap);
else
holder.imgViewUserPic.setImageBitmap(UserBitmap);
final ViewHolder finalHolder = holder;
holder.body.setOnLongClickListener(new View.OnLongClickListener() @Override
public boolean onLongClick(View v)
ClipboardManager cm = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
cm.setText(finalHolder.body.getText());
Toast.makeText(context, "Copied to clipboard", Toast.LENGTH_SHORT).show();
return false;
);
return convertView;
final static class ViewHolder
public ImageView imgViewUserPic;
public TextView body;
public TextView time;
public LinearLayout llyPic;
这是我的布局http://pastebin.com/6xSqGpKC
【问题讨论】：
无用的问题..邮政编码 您的适配器出现问题，请同时发布代码 @WillTorres 我已经更新了我的代码 @WillTorres 你想要哪种布局..???我的意思是主布局或 itemview 布局..?? 提供的代码中使用的所有相关布局？你不知道如何正确提问吗？ 【参考方案1】：acticity_chat_singlemessage.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_ >
<LinearLayout
android:id="@+id/singleMessageContainer"
android:layout_
android:layout_ >
<TextView
android:id="@+id/singleMessage"
android:layout_
android:layout_
android:layout_gravity="center"
android:layout_margin="5dip"
android:background="@drawable/bubble_b"
android:paddingLeft="10dip"
android:text="Hello bubbles!"
android:textColor="@android:color/primary_text_light" />
</LinearLayout>
</LinearLayout>
---------------------------------------------------------------------
activity_chat.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:orientation="vertical" >
<ListView
android:id="@+id/listView1"
android:layout_
android:layout_
android:layout_marginBottom="80dp">
</ListView>
<RelativeLayout
android:id="@+id/form"
android:layout_
android:layout_
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:orientation="vertical" >
<EditText
android:layout_
android:layout_
android:inputType="textMultiLine"
android:ems="10"
android:id="@+id/chatText"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/buttonSend" />
<Button
android:layout_
android:layout_
android:text="Send"
android:id="@+id/buttonSend"
android:layout_alignBottom="@+id/chatText"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
</RelativeLayout>
----------------------------------------------------------------
ChatArrayAdapter.java activity class
public class ChatArrayAdapter extends ArrayAdapter<ChatMessage>
private TextView chatText;
private List<ChatMessage> chatMessageList = new ArrayList<ChatMessage>();
private LinearLayout singleMessageContainer;
@Override
public void add(ChatMessage object)
chatMessageList.add(object);
super.add(object);
public ChatArrayAdapter(Context context, int textViewResourceId)
super(context, textViewResourceId);
public int getCount()
return this.chatMessageList.size();
public ChatMessage getItem(int index)
return this.chatMessageList.get(index);
public View getView(int position, View convertView, ViewGroup parent)
View row = convertView;
if (row == null)
LayoutInflater inflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.activity_chat_singlemessage, parent, false);
singleMessageContainer = (LinearLayout) row.findViewById(R.id.singleMessageContainer);
ChatMessage chatMessageObj = getItem(position);
chatText = (TextView) row.findViewById(R.id.singleMessage);
chatText.setText(chatMessageObj.message);
chatText.setBackgroundResource(chatMessageObj.left ? R.drawable.bubble_a : R.drawable.bubble_b);
singleMessageContainer.setGravity(chatMessageObj.left ? Gravity.LEFT : Gravity.RIGHT);
return row;
public Bitmap decodeToBitmap(byte[] decodedByte)
return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
---------------------------------------------------------------
ChatBubbleActivity.java activity class
public class ChatBubbleActivity extends Activity
private static final String TAG = "ChatActivity";
private ChatArrayAdapter chatArrayAdapter;
private ListView listView;
private EditText chatText;
private Button buttonSend;
Intent intent;
private boolean side = false;
@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
Intent i = getIntent();
setContentView(R.layout.activity_chat);
buttonSend = (Button) findViewById(R.id.buttonSend);
listView = (ListView) findViewById(R.id.listView1);
chatArrayAdapter = new ChatArrayAdapter(getApplicationContext(), R.layout.activity_chat_singlemessage);
listView.setAdapter(chatArrayAdapter);
chatText = (EditText) findViewById(R.id.chatText);
chatText.setOnKeyListener(new OnKeyListener()
public boolean onKey(View v, int keyCode, KeyEvent event)
if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER))
return sendChatMessage();
return false;
);
buttonSend.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View arg0)
sendChatMessage();
);
listView.setTranscriptMode(AbsListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
listView.setAdapter(chatArrayAdapter);
//to scroll the list view to bottom on data change
chatArrayAdapter.registerDataSetObserver(new DataSetObserver()
@Override
public void onChanged()
super.onChanged();
listView.setSelection(chatArrayAdapter.getCount() - 1);
);
private boolean sendChatMessage()
chatArrayAdapter.add(new ChatMessage(side, chatText.getText().toString()));
chatText.setText("");
side = !side;
return true;
-------------------------------------------------------------
ChatMessage.java class file
public class ChatMessage
public boolean left;
public String message;
public ChatMessage(boolean left, String message)
super();
this.left = left;
this.message = message;
【讨论】：
谢谢@prakash。但我已经这样做了。它工作正常。但我必须在我的应用程序中加载两个视图。以上是关于Android 自定义适配器无法正常用于聊天列表视图的主要内容，如果未能解决你的问题，请参考以下文章
Android - 将搜索栏添加到自定义列表视图和简单适配器
Android - 通过 getView 函数在自定义 listView 适配器内设置 ImageView 的源无法正常工作