Android layout_width & layout_height, how does it work?

Question

I am trying to create an interface where two or more buttons will be displayed to the user, if you press the button, some layouts will be displayed for him. I am using SlidingDrawer for this purpose.

Well, layout_width and layout_height properties confuse me .

If I set the properties as shown below, only “Pen 1” is displayed on the screen.

android:layout_width="fill_parent" android:layout_height="wrap_content"

Honestly, I do not have enough knowledge about both of these properties. Can anyone share their knowledge about them?

main.xml:

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

    <SlidingDrawer android:id="@+id/slidingDrawer1"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:handle="@+id/handle1"
            android:content="@+id/content1">
                <Button android:text="Handle 1" android:layout_height="wrap_content"
                        android:layout_width="fill_parent" android:id="@+id/handle1"></Button>
                <LinearLayout android:id="@+id/content1"
                        android:layout_width="fill_parent" android:layout_height="wrap_content"
                        android:orientation="vertical" android:gravity="center"
                        android:background="#FF444444">
                        <Button android:text="Handle 1 Item 1" android:layout_height="wrap_content"
                                android:layout_width="wrap_content" android:id="@+id/item1"></Button>
                </LinearLayout>
    </SlidingDrawer>

    <SlidingDrawer android:id="@+id/slidingDrawer2"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:handle="@+id/handle2"
            android:content="@+id/content2">
                <Button android:text="Handle 2" android:layout_height="wrap_content"
                        android:layout_width="fill_parent" android:id="@+id/handle2"></Button>
                <LinearLayout android:id="@+id/content2"
                        android:layout_width="fill_parent" android:layout_height="wrap_content"
                        android:orientation="vertical" android:gravity="center"
                        android:background="#FF444444">
                        <Button android:text="Handle 2 Item 1" android:layout_height="wrap_content"
                                android:layout_width="wrap_content" android:id="@+id/item2"></Button>
                </LinearLayout>
    </SlidingDrawer>     
</LinearLayout>

Answer 1

layout_width layout_height . ; . ( , SlidingDrawer), , .

main.xml, , . , , .

, , , LinearLayout SlidingDrawers. docs SlidingDrawer, FrameLayout, RelativeLayout (, , ).

, SlidingDrawer . (, ) , 1.

Answer 2

fill_parent = match_parent, , ( - ) ""

wrap_content , ""

, match_parent wrap_content.

, 0dp.

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

    <LinearLayout
    android:id="@+id/lowerLayout"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:weightSum="1.0" >
            <LinearLayout
            android:id="@+id/headerLayout"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_weight=".7" >
                <Button
                    android:id="@+id/previousMonthButton"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Previous" />

                <TextView
                    android:id="@+id/monthName"
                    android:layout_width="0dip"
                    android:layout_height="wrap_content"
                    android:text="Large Text"
                    android:layout_weight="1"
                    android:textAppearance="?android:attr/textAppearanceLarge" android:gravity="center_horizontal" />

                <Button
                    android:id="@+id/nextMonthButton"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Next" />

            </LinearLayout>

            <LinearLayout
            android:id="@+id/lowerLayout3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:layout_weight=".3" >

                <Button
                    android:id="@+id/addEvent"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />

            </LinearLayout>

    </LinearLayout>
    <LinearLayout
    android:id="@+id/lowerLayout2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:weightSum="1.0" >

        <LinearLayout
            android:id="@+id/monthView"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:layout_weight=".7" >

        </LinearLayout>

        <ListView
            android:id="@+id/listView1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight=".3" >
        </ListView>
    </LinearLayout>

</LinearLayout>

Answer 3

, 2 .

SlidingDrawer , , , ​​ SlidingDrawer match_parent , , 2.

"" SlidingDrawer, "".

,

, ,

<?xml version="1.0" encoding="utf-8"?>

<SlidingDrawer
    android:id="@+id/slidingDrawer1"
    android:layout_width="fill_parent"
    android:layout_height="0dip"
    android:layout_weight="1"
    android:content="@+id/content1"
    android:handle="@+id/handle1" >

    <Button
        android:id="@+id/handle1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Handle 1" >
    </Button>

    <LinearLayout
        android:id="@+id/content1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#FF444444"
        android:gravity="center"
        android:orientation="vertical" >

        <Button
            android:id="@+id/item1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Handle 1 Item 1" >
        </Button>
    </LinearLayout>
</SlidingDrawer>