Android Percentage Layout Height

I know that it is impossible to set percentages and that you can set a weight of certain images to scale their heights. What I am trying to do though is specify the height of a layout relative to the layout it is within. Basicly I have something like this

<LinearLayout android:layout_height="fill_parent">
  <LinearLayout>

  </LinearLayout>
</LinearLayout>

Of course this is a very simplified version, just so you can understand my gibberish. Basicly I want to set the inner linearlayout to be around 50% of the main linearlayout.

What is the best way to do this?

Solution 1:

There is an attribute called android:weightSum.

You can set android:weightSum="2" in the parent linear_layout and android:weight="1" in the inner linear_layout.

Remember to set the inner linear_layout to fill_parent so weight attribute can work as expected.

Btw, I don't think its necesary to add a second view, altough I haven't tried. :)

<LinearLayout
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    android:weightSum="2">

    <LinearLayout
        android:layout_height="fill_parent"
        android:layout_width="fill_parent"
        android:layout_weight="1">
    </LinearLayout>

</LinearLayout>

Solution 2:

You could add another empty layout below that one and set them both to have the same layout weight. They should get 50% of the space each.

Solution 3:

android:layout_weight=".YOURVALUE" is best way to implement in percentage

<?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="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/logTextBox"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight=".20"
        android:maxLines="500"
        android:scrollbars="vertical"
        android:singleLine="false"
        android:text="@string/logText" >
    </TextView>

</LinearLayout>

Solution 4:

Just as you said, I'd recommend weights. Percentages would be incredibly useful (don't know why they aren't supported), but one way you could do it is like so:

<LinearLayout
    android:layout_height="fill_parent"
    android:layout_width="fill_parent"
    >
    <LinearLayout
        android:layout_height="0dp"
        android:layout_width="fill_parent"
        android:layout_weight="1"
        >
    </LinearLayout>
    <View
        android:layout_height="0dp"
        android:layout_width="fill_parent"
        android:layout_weight="1"
    />
</LinearLayout>

The takeaway being that you have an empty View that will take up the remaining space. Not ideal, but it does what you're looking for.