以线性布局编程方式移动布局位置

Question

我有以下xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:id="@+id/wrapper"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:layout_margin="10dip"
        android:weightSum="1"
        android:background="#000"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/textMessage"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight = ".9"
            android:layout_gravity="center"
            android:layout_margin="5dip"
            android:paddingLeft="10dip"
            android:background="#FFF"
            android:text="TEXT NOT SET"
            android:textColor="@android:color/white" />
        <ImageView
            android:id="@+id/thumbPhoto"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight = ".1"
            android:src="@drawable/ic_contact_default"/>
    </LinearLayout>
</LinearLayout>

我想做的是让我的ImageView的位置以编程方式更改到textMessage的左侧.

这可以通过将我的ImageView放在TextView上方通过xml完成​​.但是我想以编程方式实现相同的结果.

假设我的适配器中有这个:

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.chat_item, parent, false);
    }

    wrapper = (LinearLayout) row.findViewById(R.id.wrapper);

    // How should I change the position of my ImageView ??
    wrapper.setGravity([some_condition] ? Gravity.LEFT : Gravity.RIGHT);

    return row;
}

Answer 1

试试这样....

ImageView imageView= (ImageView)yourLinearLayout.findViewById(R.id.thumbPhoto);
yourLinearLayout.removeViewAt(1);
yourLinearLayout.addView(0, imageView);

通过使用此行

// How should i change the position of my ImageView ??
        wrapper.setGravity([some_condition] ? Gravity.LEFT : Gravity.RIGHT);

它显示没有效果.因为在这里你将重力应用于线性布局,这种重力将其整个内容左右对齐.