bitmap requires a valid src attribute

关于作者：CSDN内容合伙人、技术专家，从零开始做日活千万级APP。
专注于分享各领域原创系列文章，擅长java后端、移动开发、商业变现、人工智能等，希望大家多多支持。
未经允许不得转载

一、导读

我们继续总结学习遇到的问题，温故知新。

今天遇到一个线上问题，启动就闪退，比较坑，在此做一个记录，防止掉坑。

二、概览

我们在启动时做了一个启动图的优化，启动时让用户看到公司的logo，同时解决黑屏、白屏问题，这时也给用户一个假象，感觉启动起来很快一样。

但是上线后包了一些错误，如下：

java.lang.RuntimeException:Unable to start activity ComponentInfo{com.qxx/com.qxx.Activity}: android.view.InflateException: Binary XML file line #9: Error inflating class <unknown>
2
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:26913)

Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #51: <bitmap> requires a valid src attribute

java.lang.RuntimeException:Unable to start activity ComponentInfo{com.xx/com.xx.Activity}: android.content.res.Resources$NotFoundException: File res/xyadx.xml from drawable resource ID #xxxx
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:25211)
......
Caused by:
org.xmlpull.v1.XmlPullParserException:Binary XML file line #91: <bitmap> requires a valid src attribute


# main(1)

org.xmlpull.v1.XmlPullParserException

Binary XML file line #9: <bitmap> requires a valid 'src' attribute

java.lang.RuntimeException:Unable to start activity ComponentInfo{com.xxx/com.xxxActivity}: android.content.res.Resources$NotFoundException: Drawable com.xxx:drawable/loading_bg with resource ID #0x7xxf2
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:27681)
......
Caused by:
org.xmlpull.v1.XmlPullParserException:Binary XML file line #19: <bitmap> requires a valid 'src' attribute

三、问题记录

配置上中下三个image，再配个背景，更显高大上，

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    全局背景
    <item>
        <color android:color="#FFFFFF" />
    </item>

     配置上中下三个image
    <item>
        <bitmap
            android:gravity="top"
            android:src="@drawable/loading_bg" />
    </item>
    <item
        android:bottom="@dimen/dp_10">
        <bitmap
            android:gravity="center"
            android:src="@drawable/loading_slogan" />
    </item>
    <item>
        <bitmap
            android:gravity="bottom"
            android:src="@drawable/loading_buttom_logo" />
    </item>
</layer-list>

我们一起看看源码报错的地方 BitmapDrawable.java


    /**
     * Updates the constant state from the values in the typed array.
     */
    private void updateStateFromTypedArray(TypedArray a, int srcDensityOverride)
            throws XmlPullParserException {
        final Resources r = a.getResources();
        final BitmapState state = mBitmapState;

        final int srcResId = a.getResourceId(R.styleable.BitmapDrawable_src, 0);
        if (srcResId != 0) {
            
            ...

            一系列的操作后，根据resid去获取bitmap，如果bitmap为空，则会抛出异常
            Bitmap bitmap = null;
            try (InputStream is = r.openRawResource(srcResId, value)) {
                ImageDecoder.Source source = ImageDecoder.createSource(r, is, density);
                bitmap = ImageDecoder.decodeBitmap(source, (decoder, info, src) -> {
                    decoder.setAllocator(ImageDecoder.ALLOCATOR_SOFTWARE);
                });
            } catch (Exception e) {
            }

            if (bitmap == null) {
                throw new XmlPullParserException(a.getPositionDescription() +
                        ": <bitmap> requires a valid 'src' attribute");
            }

        }

        ...
    }