Question

在过去的几个月里，我一直在尝试使用android（主要是教程）。在我的空闲时间里，我一直在研究一个短信应用程序（我自己），我已经成功地为每一行获得了不同的布局，但它并没有像我想要的那样工作。

每行要么是左边还是右边（默认为左边），具体取决于光标所在位置的数字是否为我的电话号码。

问题是我的测试数据看起来像这样（绿色是我的文字）：

enter image description here

以下是我的自定义适配器的代码：

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();
    }


}

您可以通过打印myPhoneNumber和number的值来查看我尝试调试问题的方法。看起来它们并不总是与行正确匹配。它会在我应该是我的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的同一行显示我的号码。像：

555-555-FRND
Have you played Dynasty Warriors?
555-555-MINE
Not yet. Maybe soon.

但在那时，打印出来的是：

phone#: 555-555-FRND
my# 555-555-MINE
phone#: 555-555-FRND
my# 555-555-MINE

什么时候看起来像：

phone#: 555-555-FRND
my# 555-555-MINE
phone#: 555-555-MINE
my# 555-555-MINE

我对这导致了什么感到茫然。

如果有帮助，这是我的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：我还发现当我向上滚动然后向下滚动时，行会随机对齐。

EDIT2：添加了XML

single_message_layout_right.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>

single_message_layout_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>

Answer 1

我从newView切换到getView，这对我有用。

@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;
}

Android的简单游标适配器和多行布局

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