How to avoid nested weights?

android, android-layout

Solution

You could use RelativeLayout to avoid the nested weights.

Nested weights are bad for performance because the number of measurements increase exponentially with each one nested.

Problem

I have a xml layout to enter a pincode: ``` <?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:background="#FF000000" android:orientation="vertical" android:weightSum="1" > <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_margin="5dp" android:layout_weight="0.2" android:background="@android:drawable/edit_text" android:gravity="center_vertical" android:orientation="horizontal" > <EditText android:id="@+id/pinDisplay" android:layout_width="0dip" android:layout_height="fill_parent" android:layout_weight="0.85" android:background="@null" /> <ImageButton android:id="@+id/backspace" style="@android:style/Widget.Button" android:layout_width="wrap_content" android:layout_height="fill_parent" android:layout_gravity="center_vertical" android:layout_margin="3dp" android:layout_weight="0.15" android:gravity="center" android:src="@android:drawable/ic_input_delete" /> </LinearLayout>  <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="0.8" android:baselineAligned="false" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="0dp" android:layout_marginLeft="5dip" android:layout_marginRight="4dip" android:layout_weight="1" android:orientation="horizontal" > <Button android:id="@+id/one" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="1" android:textAppearance="@android:attr/text" /> <Button android:id="@+id/two" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="2" /> <Button android:id="@+id/three" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="3" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="0sp" android:layout_marginLeft="5dip" android:layout_marginRight="4dip" android:layout_weight="1" android:orientation="horizontal" > <Button android:id="@+id/four" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="4" /> <Button android:id="@+id/five" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="5" /> <Button android:id="@+id/six" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="6" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="0sp" android:layout_marginLeft="5dip" android:layout_marginRight="4dip" android:layout_weight="1" android:orientation="horizontal" > <Button android:id="@+id/seven" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="7" /> <Button android:id="@+id/eight" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="8" /> <Button android:id="@+id/nine" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="9" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="0sp" android:layout_marginBottom="10dip" android:layout_marginLeft="5dip" android:layout_marginRight="4dip" android:layout_weight="1" android:orientation="horizontal" > <Button android:id="@+id/ok" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:enabled="false" android:text="OK" android:textColor="#B8B8B8" /> <Button android:id="@+id/zero" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="0" /> <Button android:id="@+id/clear" android:layout_width="0sp" android:layout_height="fill_parent" android:layout_weight="1" android:text="Clear" /> </LinearLayout> </LinearLayout> </LinearLayout> ``` The layout is fine, but I get a lot of Lint warnings about nested weights. Nested weights are bad for performance I don't really notice the layout loading slow or anything. What can I do to avoid nested weights? Or should I just leave it like it is?

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