如何为我的应用添加背景图片? [英] How do I add a background image to my app?

问题描述

如何添加图片并将其设置为我的应用背景

我知道您将所需的图像粘贴到了drawable文件夹中.这是代码本身的问题，还是应该创建一个RelativeLayout?还是仅仅是在提供的代码中进行了一行更改?

I know that you paste your desired image into the drawable folder.Is it a problem within the code itself, or I supposed to create a RelativeLayout? Or is it simply just a line change within the code provided?

这是我的代码，没有更改任何行.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="anaheim.startercalculator.MainActivity">

<EditText
    android:id="@+id/firstNumEditText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="48dp"
    android:ems="10"
    android:hint="Enter a value"
    android:inputType="number"
    app:layout_constraintHorizontal_bias="0.503"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp" />

<EditText
    android:id="@+id/secondNumEditText"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:ems="10"
    android:hint="Enter a value"
    android:inputType="number"
    app:layout_constraintHorizontal_bias="0.503"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/firstNumEditText"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp" />

<Button
    android:id="@+id/addBtn"
    android:layout_width="95dp"
    android:layout_height="45dp"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="58dp"
    android:text="ADD"
    app:layout_constraintHorizontal_bias="0.501"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/secondNumEditText"
    tools:layout_editor_absoluteX="143dp" />

<Button
    android:id="@+id/multBtn"
    android:layout_width="95dp"
    android:layout_height="45dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:text="MULTIPLY"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/addBtn"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    tools:layout_editor_absoluteY="263dp"
    tools:layout_editor_absoluteX="143dp"
    app:layout_constraintHorizontal_bias="0.501" />

<TextView
    android:id="@+id/resultTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textSize="48sp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginTop="139dp"
    app:layout_constraintTop_toBottomOf="@+id/multBtn"
    app:layout_constraintHorizontal_bias="0.501"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp" />

<Button
    android:id="@+id/subBtn"
    android:layout_width="98dp"
    android:layout_height="45dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:text="Subtract"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginStart="8dp"
    android:layout_marginEnd="8dp"
    app:layout_constraintVertical_bias="0.027"
    android:layout_marginTop="8dp"
    app:layout_constraintTop_toBottomOf="@+id/multBtn"
    tools:layout_editor_absoluteY="323dp"
    tools:layout_editor_absoluteX="143dp"
    app:layout_constraintHorizontal_bias="0.503" />

<Button
    android:id="@+id/divBtn"
    android:layout_width="95dp"
    android:layout_height="45dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginTop="8dp"
    android:text="DIVIDE"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/subBtn"
    tools:layout_editor_absoluteY="377dp" />

</android.support.constraint.ConstraintLayout>

推荐答案

如果要提供完整布局的背景，请使用以下代码:

If you want to give background for complete layout, then go with this code :

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    **android:background="@drawable/ic_add"**>

</android.support.constraint.ConstraintLayout>

这篇关于如何为我的应用添加背景图片?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！