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为什么ImageView无法在Activity Android Studio中显示

• 问答

我正在使用constraintlayout，并且有一个活动是用户个人资料。它包括用户的图片。当我编码xml布局时。我可以在android studio的预览窗口中看到图片，图像是png图像。我试图将图像更改为android studio头像之一。仍然不起作用。但是，当我运行该应用程序时，图片未显示。有谁知道为什么会这样？ 

<?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"
    android:background="@color/profileBackground">

    <android.support.constraint.ConstraintLayout
        android:id="@+id/constraintLayout"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_marginBottom="8dp"
        android:background="@drawable/bacround_gradient"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.001">

        <TextView
            android:id="@+id/name_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="72dp"
            android:layout_marginEnd="8dp"
            android:fontFamily="sans-serif-condensed-medium"
            android:text="Amanda Bozquet"
            android:textAlignment="center"
            android:textColor="@color/headerTextColor"
            android:textSize="25sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.497"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

    </android.support.constraint.ConstraintLayout>

    <ImageView
        android:id="@+id/user_imageview"
        android:layout_width="126dp"
        android:layout_height="109dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="144dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.498"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:src="@drawable/prifile_pic" />


    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:paddingBottom="20dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/user_imageview"
        app:layout_constraintVertical_bias="0.275">

        <TextView
            android:id="@+id/occupation_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginEnd="8dp"
            android:text="Marine Biologist"
            android:textSize="20sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/workplace_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginEnd="8dp"
            android:text="Key Biscaine National Park"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.497"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/occupation_textview" />

        <TextView
            android:id="@+id/state_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginEnd="8dp"
            android:text="FL,USA"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.497"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/workplace_textview" />

        <LinearLayout
            android:id="@+id/linearLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="24dp"
            android:layout_marginEnd="8dp"
            android:orientation="horizontal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/state_textview">

            <ImageView
                android:id="@+id/email_imageview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="40dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.126"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/state_textview"
                app:srcCompat="@drawable/ic_mail_black_24dp" />

            <TextView
                android:id="@+id/email_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="40dp"
                android:layout_marginEnd="8dp"
                android:text="abozquet@biscainepark.org"
                android:textSize="18sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.031"
                app:layout_constraintStart_toEndOf="@+id/email_imageview"
                app:layout_constraintTop_toBottomOf="@+id/state_textview" />

        </LinearLayout>


        <LinearLayout
            android:id="@+id/linearLayout2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:orientation="horizontal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/linearLayout">


            <ImageView
                android:id="@+id/phone_imageview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.126"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/email_imageview"
                app:srcCompat="@drawable/ic_local_phone_black_24dp" />

            <TextView
                android:id="@+id/phone_textview"
                android:layout_width="239dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="184dp"
                android:text="1 (786) 352-2254"
                android:textSize="18sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.031"
                app:layout_constraintStart_toEndOf="@+id/phone_imageview"
                app:layout_constraintTop_toBottomOf="@+id/email_textview" />

        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearLayout3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:orientation="horizontal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/linearLayout2">


            <ImageView
                android:id="@+id/video_imageview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.126"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/phone_imageview"
                app:srcCompat="@drawable/ic_videocam_white_24dp" />

            <TextView
                android:id="@+id/video_textview"
                android:layout_width="242dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="184dp"
                android:text="1 (786) 352-2254"
                android:textSize="18sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.031"
                app:layout_constraintStart_toEndOf="@+id/video_imageview"
                app:layout_constraintTop_toBottomOf="@+id/phone_textview" />

        </LinearLayout>


        <LinearLayout
            android:id="@+id/linearLayout4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:orientation="horizontal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/linearLayout3">


            <ImageView
                android:id="@+id/facebook_imageview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.126"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/video_textview"
                app:srcCompat="@drawable/ic_icon_facebook" />

            <TextView
                android:id="@+id/facebook_textview"
                android:layout_width="336dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="184dp"
                android:text="http://facebook.com/amandab"
                android:textSize="18sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.031"
                app:layout_constraintStart_toEndOf="@+id/facebook_imageview"
                app:layout_constraintTop_toBottomOf="@+id/video_textview" />

        </LinearLayout>

        <LinearLayout
            android:id="@+id/linearLayout5"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:orientation="horizontal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/linearLayout4">


            <ImageView
                android:id="@+id/twitter_imageview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="8dp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.126"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/facebook_textview"
                app:srcCompat="@drawable/ic_twitter_white" />

            <TextView
                android:id="@+id/twitter_textview"
                android:layout_width="336dp"
                android:layout_height="wrap_content"
                android:layout_marginStart="8dp"
                android:layout_marginTop="20dp"
                android:layout_marginEnd="184dp"
                android:text="\@mandabuz48"
                android:textSize="18sp"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.031"
                app:layout_constraintStart_toEndOf="@+id/twitter_imageview"
                app:layout_constraintTop_toBottomOf="@+id/facebook_textview" />

        </LinearLayout>

    </android.support.constraint.ConstraintLayout>
</android.support.constraint.ConstraintLayout>
zhaohevip 回答：为什么ImageView无法在Activity Android Studio中显示

您的任何ImageViews是否显示预期的图像？您的个人资料pic ImageView使用tools:src，而其他人使用app:srcCompat

我也注意到了一个潜在的错字-

tools:src="@drawable/prifile_pic"

,

来自：https://developer.android.com/studio/write/tool-attributes

  

Android Studio在工具中支持各种XML属性   启用设计时功能（例如，要布局的布局）的名称空间   片段中显示）或编译时行为（例如缩小的行为）   模式以应用于您的XML资源）。当您构建应用时，   构建工具会删除这些属性，因此不会对您的APK产生影响   大小或运行时行为。


所以属性：

tools:src="@drawable/prifile_pic"

仅在设计时有效。
该文件未在APK中进行编译，运行该应用程序时您将看不到该图像。
更改为：

app:srcCompat="@drawable/prifile_pic"
,

您是否在android studio日志猫中遇到任何异常，例如找不到图片？正如针迹在上述评论-> prifile_pic 的错字错误中所写，请检查可绘制名称在xml布局中与可绘制文件夹中的图像名称相同。

androidandroid-studiolayoutxml
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