在Android中从Java更改RelativeLayout

我有一个XML RelativeLayout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <RelativeLayout
        android:id="@+id/relativeBackGround"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:layout_gravity="right"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp" >

        <ImageView
            android:id="@+id/img1"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:src="@drawable/sample" />

        <LinearLayout
        android:id="@+id/linout"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_alignParentBottom="true"
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/img1"
            android:background="@drawable/bubble_left" >

            <TextView
                android:id="@+id/text1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="text1" />

            <TextView
                android:id="@+id/text2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="15dp"
                android:text="text2"
                android:textSize="10sp" />

        </LinearLayout>

    </RelativeLayout>

</LinearLayout>

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setGravity不起作用，我不知道如何对齐，你能帮我吗？

你可以用类似于以下的东西设置LinearLayout的布局：

LinearLayout ll = (LinearLayout) view.findViewById(R.id.linout);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
         RelativeLayout.LayoutParams.WRAP_CONTENT,
         RelativeLayout.LayoutParams.MATCH_PARENT);
lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

ll.setLayoutParams(lp);

然后根据是奇数行还是偶数行切换规则

LinearLayout ll = (LinearLayout) view.findViewById(R.id.linout);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
         RelativeLayout.LayoutParams.WRAP_CONTENT,
         RelativeLayout.LayoutParams.MATCH_PARENT);
lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);

ll.setLayoutParams(lp);