如何将文本框与屏幕底部的三个按钮一起居中放置在屏幕中央？

Question

I am working with android and I have designed my xml in which I am showing three buttons at the bottom of my screen. Now I want to show a textbox at the center of my screen along with three buttons at the bottom of the screen.

Below is my layout which shows three buttons at the bottom of the screen but it doesn't show textbox at the center of the screen -

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >

        <EditText
            android:id="@+id/edittext"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button"
            android:layout_below="@+id/textView1"
            android:layout_marginTop="61dp"
            android:ems="10"
            android:inputType="text" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/button1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="ButtonA" />

        <Button
            android:id="@+id/button2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="ButtonB" />

        <Button
            android:id="@+id/button3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="ButtonC" />
    </LinearLayout>

</LinearLayout> 

And also how do I add a placeholder in the textbox just like we do in HTML? As soon as I click in the testbox that placeholder will be gone and they can start typing.

Answer 1

Try using ReleativeLayout instead then for the TextView you can set attribute named

android:layout_centerInParent="true"

, and for three buttons , set layout_alignParentBottom :

android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"

then align other two buttons related to first.

<RelativeLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/edittext"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

    <Button
        android:id="@+id/button1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignRight="@id/button3"
        android:text="ButtonA" />

    <Button
        android:id="@+id/button2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignRight="@id/button3"
        android:text="ButtonB" />

    <Button
        android:id="@+id/button3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="ButtonC"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"/>

</RelativeLayout>

Answer 2

Use below code, i think its work for you

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/button1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="ButtonA" />

    <Button
        android:id="@+id/button2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="ButtonB" />

    <Button
        android:id="@+id/button3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="ButtonC" />
</LinearLayout>

<EditText
    android:id="@+id/edittext"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_centerVertical="true"
    android:ems="10"
    android:hint="Your Hint Here"
    android:inputType="text" >
</EditText>

<Spinner
    android:id="@+id/spinner1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/edittext"
    android:layout_centerHorizontal="true" />

Answer 3

I reviewed your code and sorted it out for you. android:hint="Your Message here". can be used to add a placeholder in the textbox.

`

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1" >

    <EditText
        android:id="@+id/edittext"
        android:layout_width="fill_parent"
        android:layout_height="80dp"
        android:layout_alignLeft="@+id/button"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="61dp"
        android:ems="10"
        **android:hint="@string/edit_message"**
        android:inputType="text" />

</LinearLayout>



    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/button1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="ButtonA" />

    <Button
        android:id="@+id/button2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="ButtonB" />



        <Button
        android:id="@+id/button3"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="ButtonC" />
</LinearLayout>

`