Question

我正在尝试使用从developer.android.com下载的contactList示例代码。它显示联系人列表但没有显示联系人缩略图？

http://developer.android.com/training/contacts-provider/retrieve-names.html

有时当我滚动整个手机屏幕边框显示红色闪烁线。

编辑： - 找到缩略图未加载的解决方案。这只是android 4.4上的一个问题，以下解决方案解决了这个问题。 NewFromFD failed in nativeDecodeFileDescriptor - Android 4.4

但我仍然遇到这个闪烁的问题。这是堆栈跟踪。

08-27 00:01:15.042  19477-19477/com.example.android.contactslist D/StrictMode﹕ StrictMode policy violation; ~duration=7 ms: android.os.StrictMode$StrictModeDiskWriteViolation: policy=2335 violation=1
            at android.os.StrictMode$AndroidBlockGuardPolicy.onWriteToDisk(StrictMode.java:1130)
            at libcore.io.BlockGuardOs.write(BlockGuardOs.java:196)
            at libcore.io.IoBridge.write(IoBridge.java:450)
            at java.io.FileOutputStream.write(FileOutputStream.java:187)
            at java.io.OutputStream.write(OutputStream.java:82)
            at com.android.server.ssrm.SSRMUtil.writeSysfs(SSRMUtil.java:135)
            at com.android.server.ssrm.CustomFrequencyManagerService.releaseCpuDvfsLock(CustomFrequencyManagerService.java:2334)
            at com.android.server.ssrm.CustomFrequencyManagerService.releaseDVFSLockLocked(CustomFrequencyManagerService.java:2029)
            at com.android.server.ssrm.CustomFrequencyManagerService.releaseDVFSLock(CustomFrequencyManagerService.java:1958)
            at android.os.ICustomFrequencyManager$Stub.onTransact(ICustomFrequencyManager.java:285)
            at android.os.Binder.execTransact(Binder.java:404)
            at dalvik.system.NativeStart.run(Native Method)
    # via Binder call with stack:
    android.os.StrictMode$LogStackTrace
            at android.os.StrictMode.readAndHandleBinderCallViolations(StrictMode.java:1726)
            at android.os.Parcel.readExceptionCode(Parcel.java:1447)
            at android.os.Parcel.readException(Parcel.java:1416)
            at android.os.ICustomFrequencyManager$Stub$Proxy.releaseDVFSLock(ICustomFrequencyManager.java:782)
            at android.os.CustomFrequencyManager$CPUDVFSControlRequest.cancelFrequencyRequestImpl(CustomFrequencyManager.java:485)
            at android.os.CustomFrequencyManager$FrequencyRequest.cancelFrequencyRequest(CustomFrequencyManager.java:223)
            at android.os.DVFSHelper.release(DVFSHelper.java:532)
            at android.widget.AbsListView.reportScrollStateChange(AbsListView.java:5456)
            at android.widget.AbsListView.onTouchUp(AbsListView.java:4888)
            at android.widget.AbsListView.onTouchEvent(AbsListView.java:4605)
            at android.view.View.dispatchTouchEvent(View.java:8149)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2416)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2140)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2422)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2155)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2295)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1622)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2565)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2243)
            at android.view.View.dispatchPointerEvent(View.java:8357)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4778)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4644)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4202)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4256)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4225)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4336)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4233)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4393)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4202)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4256)
            at android.view.ViewRootImp

Answer 1

我找到了缩略图无法加载的解决方案。

此问题仅在4.4上可见，将文件作为InputStream而不是AssetFileDescriptor打开修复了此问题。

1）用这个替换ContactListFragment.java中的原始函数。

private Bitmap loadContactPhotoThumbnail(String photoData) {
InputStream is = null;
try {
    Uri thumbUri;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        thumbUri = Uri.parse(photoData);
    } else {
        final Uri contactUri = Uri.withAppendedPath(
                Contacts.CONTENT_URI, photoData);
        thumbUri = Uri.withAppendedPath(contactUri, Contacts.Photo.CONTENT_DIRECTORY);
    }

    is = getActivity().getContentResolver().openInputStream(thumbUri);

    if (is != null) {
        return BitmapFactory.decodeStream(is);
    }
} catch (FileNotFoundException e) {
    e.printStackTrace();
} finally {
    if (is != null) {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
return null;

}

我在这里找到了这个解决方案

NewFromFD failed in nativeDecodeFileDescriptor - Android 4.4

但我已根据更新的示例代码更新了该答案。

闪烁是由于StrictMode策略违规造成的，这是从堆栈跟踪中清楚的。所以要按照以下步骤进行修复

打开设置＆gt;开发者选项并向下滚动一点。
在这里您可以找到严格模式选项。
取消选中/取消标记。
然后重新启动设备。

Android示例contactList，缩略图未加载

1 个答案: