ImageView images appear pixelated and low.

Question

My images in ImageView are all pixelated and low quality, almost blurry. All of them are 48px x 48pxPNG files in my folder. Here is my xml file.

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:id="@+id/main"
    android:background="#ecf0f1">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:src="@drawable/my_photo1"
        android:onClick="val1"
        android:layout_alignParentBottom="true"
        android:layout_toLeftOf="@+id/ImageView"
        android:layout_toStartOf="@+id/ImageView" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="0"
        android:id="@+id/val"
        android:textIsSelectable="false"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:textSize="60dp"
        android:textColor="#ff34495e" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/ImageView"
        android:src="@drawable/my_photo2"
        android:visibility="invisible"
        android:onClick="val2"
        android:layout_alignTop="@+id/imageView"
        android:layout_toLeftOf="@+id/imageView2"
        android:layout_toStartOf="@+id/imageView2" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView2"
        android:src="@drawable/my_photo3"
        android:visibility="invisible"
        android:onClick="val3"
        android:layout_alignTop="@+id/ImageView"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView3"
        android:src="@drawable/my_photo4"
        android:visibility="invisible"
        android:onClick="val4"
        android:layout_alignTop="@+id/imageView2"
        android:layout_toLeftOf="@+id/imageView4"
        android:layout_toStartOf="@+id/imageView4" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView4"
        android:src="@drawable/my_photo5"
        android:visibility="invisible"
        android:onClick="val5"
        android:layout_alignTop="@+id/imageView3"
        android:layout_toLeftOf="@+id/imageView5"
        android:layout_toStartOf="@+id/imageView5" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView5"
        android:src="@drawable/my_photo6"
        android:visibility="invisible"
        android:onClick="val6"
        android:layout_alignTop="@+id/imageView4"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:text="Cup Cakes"
        android:id="@+id/textView"
        android:layout_alignParentBottom="true"
        android:layout_toLeftOf="@+id/imageView"
        android:layout_toStartOf="@+id/imageView"
        android:textColor="#ff34495e" />

</RelativeLayout>

Answer 1

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src/main/res dir, , :

/ , , icon-example.png, mipmap . , Android .