ClassCastException异常：android.widget.RelativeLayout不能转换为android.widget.LinearLayout [英] ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.LinearLayout

问题描述

我有一些问题，与此code。
我试图创建的新闻动态清单，格式为：

I have some problems with this code. I'm trying to create a dynamically list of news with this format:

|image| - title
|image|- subtitle

---

这是我的一点cicle code（用随机数据为例）

---

this is my little cicle code (a example with random data)

void setListNews(List<Map<String,String>>l){
        listaNewsPagina = l;
        final Iterator ite = listaNewsPagina.iterator();
        LinearLayout lin = (LinearLayout)findViewById(R.id.linear_sezione_news);
        LinearLayout lineare = (LinearLayout)findViewById(R.id.lineare);
        while(ite.hasNext()){
            Map<String,String> map = (Map<String, String>) ite.next();
            ImageView imm = (ImageView)findViewById(R.id.immagine);
            RelativeLayout rl = (RelativeLayout)findViewById(R.id.relative);
            TextView titolo = (TextView)findViewById(R.id.titolo);
            TextView sottoTitolo = (TextView)findViewById(R.id.sottoTitolo);
            titolo.setText("titolooooo");
            sottoTitolo.setText("sottoTitoloooooooooooo");
            rl.addView(titolo);
            rl.addView(sottoTitolo);
            lineare.addView(imm);
            lineare.addView(rl);
        }
        lin.addView(lineare);
            setContentView(lin);

这是我的布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linear_sezione_news"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/background_homepage" >

    <LinearLayout
        android:id="@+id/lineare"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#aadd99"
         >

        <ImageView
            android:id="@+id/immagine"
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:layout_marginBottom="4dp"
            android:layout_marginLeft="4dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="4dp"
            android:src="@drawable/ic_launcher" />

        <RelativeLayout
            android:id="@+id/relative"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginBottom="4dp"
            android:layout_marginLeft="4dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="4dp"
            android:background="#abfc99">

        <TextView
            android:id="@+id/titolo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp" />
        <TextView
            android:id="@+id/sottoTitolo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/titolo"
            android:textSize="13dp" />
        </RelativeLayout>
    </LinearLayout>

    <ListView
        android:id="@+id/listViewNews"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/ImageButtonPrecc"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/lineare"
        android:alpha="0.8"
        android:background="#aadd99"
        android:clickable="true"
        android:padding="10dp"
        android:textAlignment="center" >

    </ListView>

    <ImageButton
        android:id="@+id/ImageButtonPrecc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_alignParentLeft="true"
        android:src="@drawable/bottone_prev"
        android:text="@string/load_news" />

    <ImageButton
        android:id="@+id/ImageButtonSucc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:src="@drawable/bottone_next"
        android:text="@string/load_news" />

</RelativeLayout>

当我开始练习这个code我有这样的问题：

when I launch the activity with this code I have this problem:

9月5日至19日：12：45.780：E / AndroidRuntime（21729）：java.lang.ClassCastException：android.widget.RelativeLayout不能转换为android.widget.LinearLayout

05-19 09:12:45.780: E/AndroidRuntime(21729): java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.LinearLayout

我试图创建具有唯一的Java code的布局......但没有XD
在这里我错了？

I'm trying to create a layout with only Java code...but nothing XD where I'm wrong?

推荐答案

修改

LinearLayout lin = (LinearLayout)findViewById(R.id.linear_sezione_news);

到

RelativeLayout lin = (RelativeLayout)findViewById(R.id.linear_sezione_news);

该ID linear_sezione_news 分配给 RelativeLayout的，所以你不能将它转换为的LinearLayout

The id linear_sezione_news is assigned to a RelativeLayout so you can't cast it to LinearLayout

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