Android的简单光标适配器和多行布局
在过去的几个月里,我到处都在涉猎android,大部分只是教程。在我空闲时间学习的时候,我一直在为自己开发一个短信应用程序,我成功地为每一行设置了不同的布局,但它并没有像我预期的那样工作 根据光标所在位置的号码是否是我的电话号码,默认情况下,每一行都是左或右左 问题是,我的测试数据如下所示,其中绿色是我的文本: 以下是我的自定义适配器的代码:Android的简单光标适配器和多行布局,android,android-layout,android-listview,simplecursoradapter,Android,Android Layout,Android Listview,Simplecursoradapter,在过去的几个月里,我到处都在涉猎android,大部分只是教程。在我空闲时间学习的时候,我一直在为自己开发一个短信应用程序,我成功地为每一行设置了不同的布局,但它并没有像我预期的那样工作 根据光标所在位置的号码是否是我的电话号码,默认情况下,每一行都是左或右左 问题是,我的测试数据如下所示,其中绿色是我的文本: 以下是我的自定义适配器的代码: public class ConversationMessageListAdapter extends SimpleCursorAdapter {
public class ConversationMessageListAdapter extends SimpleCursorAdapter {
private LayoutInflater inflater;
private String myPhoneNumber;
public ConversationMessageListAdapter(Context context, int layout, Cursor cursor, String[] from, int[] to, int flags) {
super(context, layout, cursor, from, to, flags);
myPhoneNumber = getMyPhoneNumber(context);
inflater = LayoutInflater.from(context);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
String number = cursor.getString(2);
System.out.println("phone#: "+number);
System.out.println("my#: "+myPhoneNumber);
if(number.equals(myPhoneNumber)){
View view = inflater.inflate(R.layout.single_message_layout_right, null);
return view;
}
return super.newView(context, cursor, parent);
}
public String getMyPhoneNumber(Context context){
TelephonyManager tMgr = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
return tMgr.getLine1Number();
}
}
您可以看到我试图通过打印myPhoneNumber和number的值来调试问题。看起来它们并不总是与行正确匹配。它会在应该属于我的那一行上显示朋友的号码,但如果我保留默认布局,将它们全部保留在左侧,它会在textview的同一行上显示我的号码。比如:
555-555-FRND
Have you played Dynasty Warriors?
555-555-MINE
Not yet. Maybe soon.
但在这一点上,get打印的是:
phone#: 555-555-FRND
my# 555-555-MINE
phone#: 555-555-FRND
my# 555-555-MINE
当它看起来像:
phone#: 555-555-FRND
my# 555-555-MINE
phone#: 555-555-MINE
my# 555-555-MINE
我不知道是什么导致了这一切
如果有帮助,以下是我的setViewBinder:
textsDbAdapter.setViewBinder(new ConversationMessageListAdapter.ViewBinder() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if(columnIndex == 2){
String number = cursor.getString(columnIndex);
String sentBy = getContactName(contentResolver, number);
if(number.equals(myPhoneNumber)){
return false;
}
TextView sender = (TextView) view;
sender.setText(sentBy);
return true;
}
//datetime
if(columnIndex == 5){
Long messageDatetime = Long.valueOf(cursor.getString(columnIndex));
String receivedOn;
if(startOfToday > messageDatetime){
receivedOn = getDateFromDatetime(messageDatetime);
} else {
receivedOn = getTimeFromDatetime(messageDatetime);
}
TextView datetime = (TextView) view;
datetime.setText(receivedOn);
return true;
}
return false;
}
});
编辑:我还发现,当我上下滚动时,行会随机对齐
EDIT2:添加了XML
单个消息布局右.xml
<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="0dp"
android:paddingRight="5dp"
android:paddingTop="0dp"
android:paddingBottom="0dp"
android:layout_gravity="right"
tools:context=".ConversationActivity">
<!--Datetime Received-->
<TextView
android:id="@+id/datetime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="bottom"
android:layout_below="@+id/messageContent"
android:layout_toLeftOf="@+id/displayPicContainer"
android:textSize="14sp"
android:textColor="#9110828f" />
<!--Message-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/messageContent"
android:textSize="15sp"
android:layout_marginTop="5dp"
android:layout_toLeftOf="@+id/displayPicContainer"/>
<!--Display picture layout-->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:padding="3dp"
android:layout_marginLeft="5dp"
android:id="@+id/displayPicContainer">
<!--Display picture-->
<ImageView
android:layout_width="45dp"
android:layout_height="45dp"
android:src="@drawable/bigboss150x150"
android:id="@+id/displayPic"/>
</LinearLayout>
</RelativeLayout>
单个消息\u布局\u left.xml
<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="0dp"
android:paddingRight="5dp"
android:paddingTop="0dp"
android:paddingBottom="0dp"
tools:context=".ConversationActivity">
<!--Display picture layout-->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="3dp"
android:layout_marginRight="5dp"
android:id="@+id/displayPicContainer">
<!--Display picture-->
<ImageView
android:layout_width="45dp"
android:layout_height="45dp"
android:src="@drawable/bigboss150x150"
android:id="@+id/displayPic"/>
</LinearLayout>
<!-- sender -->
<TextView
android:id="@+id/sender"
android:textSize="14sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:text="NAME"
android:textColor="#ff9b9aa0"
android:layout_toRightOf="@+id/displayPicContainer"/>
<!--Datetime Received-->
<TextView
android:id="@+id/datetime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="bottom"
android:layout_below="@+id/messageContent"
android:layout_toRightOf="@+id/displayPicContainer"
android:textSize="14sp"
android:textColor="#9110828f" />
<!--Message-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/messageContent"
android:textSize="15sp"
android:layout_below="@+id/sender"
android:layout_toRightOf="@+id/displayPicContainer"/>
</RelativeLayout>
conversation_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/conversationListView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="43dp"
android:stackFromBottom="true"
android:transcriptMode="normal">
</ListView>
<RelativeLayout
android:id="@+id/form"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:orientation="vertical"
android:background="#ffffff">
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:inputType="textCapSentences|textMultiLine"
android:ems="10"
android:lines="5"
android:minLines="1"
android:hint="Enter message"
android:id="@+id/newMessageText"
android:scrollHorizontally="true"
android:scrollbars="vertical"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_toLeftOf="@+id/sendButton"/>
<Button
android:layout_width="60dp"
android:layout_height="wrap_content"
android:text="Send"
android:id="@+id/sendButton"
android:layout_alignBottom="@+id/newMessageText"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
</RelativeLayout>
我从newView切换到getView,这对我来说很有用
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row;
Log.d("RowID", messages.getString(messages.getColumnIndex("_id")));
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
String fromNumber = messages.getString(messages.getColumnIndex("fromNumber"));
if(fromNumber.equals(myPhoneNumber)){
row = inflater.inflate(R.layout.single_message_layout_right, parent, false);
} else {
row = inflater.inflate(R.layout.single_message_layout_left, parent, false);
TextView sender = (TextView) row.findViewById(R.id.sender);
String name = getContactName(fromNumber);
sender.setText(name);
}
TextView datetime = (TextView) row.findViewById(R.id.datetime);
Long messageDatetime = messages.getLong(messages.getColumnIndex("datetime"));
String receivedOn;
if(startOfToday > messageDatetime){
receivedOn = getDateFromDatetime(messageDatetime);
} else {
receivedOn = getTimeFromDatetime(messageDatetime);
}
datetime.setText(receivedOn);
String message = messages.getString(messages.getColumnIndex("message"));
TextView messageContent = (TextView) row.findViewById(R.id.messageContent);
messageContent.setText(message);
return row;
}
老实说,我不明白哪里出了问题,你打算实现什么,但有一件事我不喜欢:因为你不总是调用super.newView,它可能会卡在同一个光标位置。我会重写newView,每次调用super.newView,但如果您喜欢不同的布局,则忽略结果。问题是,事情没有正确对齐。如果查看图像,您可以看到红色和绿色部分的一些文本是如何左对齐的,一些文本是如何右对齐的。绿色部分应该在它自己的布局中向右对齐,而红色部分应该向左对齐。@JeremyJackson-请您发布该特定视图以及ListView的xml文件。我刚刚更新了它,以便您可以看到它。