android - 尝试在主线程之外初始化硬件加速，中止

Question

有人知道为什么我会在 LogCat 中收到此警告吗？

01-18 01:18:17.475: W/HardwareRenderer(25992): Attempting to initialize hardware acceleration outside of the main thread, aborting

我在主 Activity (主线程)中使用我的 WebView 执行此操作:

wv = (WebView) findViewById(R.id.main_webview);
wv.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);

我的 list 中有这个:

<activity
   android:name=".Main"
   android:hardwareAccelerated="true"
   android:label="@string/title_activity_main" >

Answer 1

以下是硬件加速在 Android 中的工作原理:

private void enableHardwareAcceleration(WindowManager.LayoutParams attrs) {
    mAttachInfo.mHardwareAccelerated = false;
    mAttachInfo.mHardwareAccelerationRequested = false;

    // Don't enable hardware acceleration when the application is in compatibility mode
    if (mTranslator != null) return;

    // Try to enable hardware acceleration if requested
    final boolean hardwareAccelerated = 
            (attrs.flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED) != 0;

    if (hardwareAccelerated) {
        if (!HardwareRenderer.isAvailable()) {
            return;
        }

        // Persistent processes (including the system) should not do
        // accelerated rendering on low-end devices.  In that case,
        // sRendererDisabled will be set.  In addition, the system process
        // itself should never do accelerated rendering.  In that case, both
        // sRendererDisabled and sSystemRendererDisabled are set.  When
        // sSystemRendererDisabled is set, PRIVATE_FLAG_FORCE_HARDWARE_ACCELERATED
        // can be used by code on the system process to escape that and enable
        // HW accelerated drawing.  (This is basically for the lock screen.)

        final boolean fakeHwAccelerated = (attrs.privateFlags &
                WindowManager.LayoutParams.PRIVATE_FLAG_FAKE_HARDWARE_ACCELERATED) != 0;
        final boolean forceHwAccelerated = (attrs.privateFlags &
                WindowManager.LayoutParams.PRIVATE_FLAG_FORCE_HARDWARE_ACCELERATED) != 0;

        if (!HardwareRenderer.sRendererDisabled || (HardwareRenderer.sSystemRendererDisabled
                && forceHwAccelerated)) {
            // Don't enable hardware acceleration when we're not on the main thread
            if (!HardwareRenderer.sSystemRendererDisabled
                    && Looper.getMainLooper() != Looper.myLooper()) {
                Log.w(HardwareRenderer.LOG_TAG, "Attempting to initialize hardware "
                        + "acceleration outside of the main thread, aborting");
                return;
            }

            final boolean translucent = attrs.format != PixelFormat.OPAQUE;
            if (mAttachInfo.mHardwareRenderer != null) {
                mAttachInfo.mHardwareRenderer.destroy(true);
            }                
            mAttachInfo.mHardwareRenderer = HardwareRenderer.createGlRenderer(2, translucent);
            mAttachInfo.mHardwareAccelerated = mAttachInfo.mHardwareAccelerationRequested
                    = mAttachInfo.mHardwareRenderer != null;
        } else if (fakeHwAccelerated) {
            // The window had wanted to use hardware acceleration, but this
            // is not allowed in its process.  By setting this flag, it can
            // still render as if it was accelerated.  This is basically for
            // the preview windows the window manager shows for launching
            // applications, so they will look more like the app being launched.
            mAttachInfo.mHardwareAccelerationRequested = true;
        }
    }
}

从那里，您可以看到您获得的日志是在主线程之外请求硬件加速时(如日志所述)。

在您的情况下，您必须更深入地了解您的代码并查看所有非主线程，其中一个称为硬件加速。

如果没有更多详细信息(一些代码等)，我无法为您提供帮助。