build.gradle

compile 'com.android.support:percent:23.0.0'

percentage.xml

app:layout_widthPercent
app:layout_heightPercent
app:layout_marginPercent
app:layout_marginLeftPercent
app:layout_marginTopPercent
app:layout_marginRightPercent
app:layout_marginBottomPercent
app:layout_marginStartPercent
app:layout_marginEndPercent
app:layout_aspectRatio

simpile_linear_layout.xml

<LinearLayout
    android:width="match_parent"
    andorid:orientation="horizontal"
    android:height="wrap_content">

    <TextView
        android:width="0dp"
        android:layout_weight="1"
        android:height="wrap_content"/>

    <EditText
        android:width="0dp"
        android:layout_weight="1"
        android:height="wrap_content" />

</LinearLayout>