android - 花时间在android中加载背景图片

Question

我正在使用 Picasso 加载背景图像，并且我正在使用相对布局。背景图像需要时间来加载，有些甚至没有加载。我的一段代码是，

        final int k = random.nextInt(20);
        ImageView imageView= (ImageView)findViewById(R.id.backgrd);
        TypedArray imgb = getResources().obtainTypedArray(R.array.backg);
        int resourceId = imgb.getResourceId(k, 0);

 Picasso.with(getApplicationContext()).
                load(resourceId).
                fit().
                noPlaceholder().
                into(imageView);

我尝试使用 resize() Picasso Taking time to load images也，但它不工作。

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relative1"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


        <ImageView
            android:id="@+id/backgrd"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitXY"
            />

     <ImageView
        android:id="@+id/img1"
        android:paddingTop="90dp"
        android:layout_width="wrap_content"
        android:layout_height="400dp"
        />

Answer 1

检查您用于加载的可绘制图像的大小和分辨率。

xlarge screens are at least 960dp x 720dp
large screens are at least 640dp x 480dp
normal screens are at least 470dp x 320dp
small screens are at least 426dp x 320dp
Generalised Dpi values for screens:

ldpi Resources for low-density (ldpi) screens (~120dpi)
mdpi Resources for medium-density (mdpi) screens (~160dpi). (This is the baseline density.)
hdpi Resources for high-density (hdpi) screens (~240dpi).
xhdpi Resources for extra high-density (xhdpi) screens (~320dpi).
Therefore generalised size of your resources (assuming they are full screen):

ldpi
Vertical = 426 * 120 / 160 = 319.5px
Horizontal = 320 * 120 / 160 = 240px
mdpi
Vertical = 470 * 160 / 160 = 470px
Horizontal = 320 * 160 / 160 = 320px
hdpi
Vertical = 640 * 240 / 160 = 960px
Horizontal = 480 * 240 / 160 = 720px
xhdpi
Vertical = 960 * 320 / 160 = 1920px
Horizontal = 720 * 320 / 160 = 1440px

px = dp*dpi/160

https://stackoverflow.com/a/16352208/5567283