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在华为 C8816，android 4.3 上，会报空指针异常。

经过断点调试，发现是 mCapturePhotoHelper 为 null

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Log.i(TAG, "requestCode: " + requestCode + " resultCode: " + resultCode + " data: " + data);
        if (requestCode == CapturePhotoHelper.CAPTURE_PHOTO_REQUEST_CODE) {
            File photoFile = mCapturePhotoHelper.getPhoto();
            // 代码省略
}

是不是因为 mCapturePhotoHelper 被回收了啊？

不知道你尝试过多布局没有，如果RecycleView里面有多种布局会出现找不到布局ID的问题，还请赐教

BitmapUtils.JPG_SUFFIX 这个值是什么 请问

模拟器Nexus6P 6.0
点击“拍张照片吧”，没有拍照，只显示 “未指定存储目录”

Plugin with id "com.android.application" not found

Matrix multiplication is not commutative law,How can I guarantee the changes as expected?
for example, the first call postTranslate, then call postRotate. If reversed, the result is completely different.
thanks

不提示错误，只提示你的toast 相机启动失败

如果一个activity有很多fragment，那么写起来的代码就会有很多重复的，如何封装？

还是这里好玩 😄

应该是前面是postTranslate，后面是preTranslate

` long totalPixels = width * height / inSampleSize;

        final long totalReqPixelsCap = reqWidth * reqHeight * 2;

        while (totalPixels > totalReqPixelsCap) {
            inSampleSize *= 2;
            totalPixels /= 2;
        }`

i dont quite understand the code here, maybe long totalPixels = width * height / inSampleSize; should be long totalPixels = width * height / (inSampleSize * inSampleSize )