DoD*_*oDo 23 camera android multi-window android-camera android-7.0-nougat
从多窗口文档:
多窗口模式下禁用的功能
当设备处于多窗口模式时,某些功能被禁用或忽略,因为它们对于可能与其他活动或应用共享设备屏幕的活动没有意义.这些功能包括:
- 某些系统UI自定义选项已禁用; 例如,如果应用程序未以全屏模式运行,则无法隐藏状态栏.
- 系统忽略对android:screenOrientation属性的更改.
我得到了大多数应用程序,纵向和横向模式之间的区别是没有意义的,但是我正在使用SDK,其中包含用户可以进行任何活动的摄像机视图 - 包括支持多窗口模式的活动.问题是摄像机视图包含显示摄像机预览的SurfaceView/TextureView,并且为了在所有活动方向上正确显示预览,需要有关正确活动方向的知识,以便可以正确旋转摄像机预览.
问题是我的代码通过检查当前配置方向(纵向或横向)和当前屏幕旋转来计算正确的活动方向.问题是在多窗口模式下,当前配置方向不反映真实的活动方向.这会导致相机预览旋转90度,因为Android报告的配置与方向不同.
我目前的解决方法是检查所请求的活动方向并以此为基础,但有两个问题:
即使在多窗口配置中,有没有办法可以稳健地计算正确的活动方向？
这是我目前使用的代码(请参阅有问题的部分的注释):
protected int calculateHostScreenOrientation() {
int hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
int rotation = getDisplayOrientation(wm);
boolean activityInPortrait;
if ( !isInMultiWindowMode() ) {
activityInPortrait = (mConfigurationOrientation == Configuration.ORIENTATION_PORTRAIT);
} else {
// in multi-window mode configuration orientation can be landscape even if activity is actually in portrait and vice versa
// Try determining from requested orientation (not entirely correct, because the requested orientation does not have to
// be the same as actual orientation (when they differ, this means that OS will soon rotate activity into requested orientation)
// Also not correct because, according to https://developer.android.com/guide/topics/ui/multi-window.html#running this orientation
// is actually ignored.
int requestedOrientation = getHostActivity().getRequestedOrientation();
if ( requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT ||
requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT ||
requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT ||
requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_USER_PORTRAIT ) {
activityInPortrait = true;
} else if ( requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE ||
requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE ||
requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE ||
requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE ) {
activityInPortrait = false;
} else {
// what to do when requested orientation is 'behind', 'sensor', 'user', etc. ?!?
activityInPortrait = true; // just guess
}
}
if ( activityInPortrait ) {
Log.d(this, "Activity is in portrait");
if (rotation == Surface.ROTATION_0) {
Log.d(this, "Screen orientation is 0");
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
} else if (rotation == Surface.ROTATION_180) {
Log.d(this, "Screen orientation is 180");
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
} else if (rotation == Surface.ROTATION_270) {
Log.d(this, "Screen orientation is 270");
// natural display rotation is landscape (tablet)
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
} else {
Log.d(this, "Screen orientation is 90");
// natural display rotation is landscape (tablet)
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
}
} else {
Log.d(this, "Activity is in landscape");
if (rotation == Surface.ROTATION_90) {
Log.d(this, "Screen orientation is 90");
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
} else if (rotation == Surface.ROTATION_270) {
Log.d(this, "Screen orientation is 270");
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
} else if (rotation == Surface.ROTATION_0) {
Log.d(this, "Screen orientation is 0");
// natural display rotation is landscape (tablet)
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
} else {
Log.d(this, "Screen orientation is 180");
// natural display rotation is landscape (tablet)
hostScreenOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
}
}
return hostScreenOrientation;
}
private int getDisplayOrientation(WindowManager wm) {
if (DeviceManager.getSdkVersion() < 8) {
return wm.getDefaultDisplay().getOrientation();
}
return wm.getDefaultDisplay().getRotation();
}
private boolean isInMultiWindowMode() {
return Build.VERSION.SDK_INT >= 24 && getHostActivity().isInMultiWindowMode();
}
protected Activity getHostActivity() {
Context context = getContext();
while (context instanceof ContextWrapper) {
if (context instanceof Activity) {
return (Activity) context;
}
context = ((ContextWrapper) context).getBaseContext();
}
return null;
}
编辑:我也向Android问题跟踪器报告过这个问题.
我不知道这应该被视为解决方案还是仅仅是一种解决方法.
如你所说,你的问题来自于Android N及其多窗口模式.当应用程序处于多窗口时,您Activity不依赖于完整的显示尺寸.这重新定义了Activity方向的概念.引用伊恩湖:
事实证明:"肖像"实际上只意味着高度大于宽度,"风景"意味着宽度大于高度.因此,考虑到这个定义,您的应用程序可以在调整大小时从一个过渡到另一个,这当然是有道理的.
因此,在Activity方向更改和物理旋转设备之间不再存在链接.(我认为现在唯一合理使用活动方向更改是更新您的资源.)
由于您对设备尺寸感兴趣,所以只需获取它DisplayMetrics.引用文档,
如果从非活动上下文请求,则将根据当前轮换和减去的系统装饰区域报告整个显示的大小.
所以解决方案是:
final Context app = context.getApplicationContext();
WindowManager manager = (WindowManager) app.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
int width = metrics.widthPixels;
int height = metrics.heightPixels;
boolean portrait = height >= width;
当设备倾斜时,将交换宽度和高度值(或多或少).
如果这样做,我会亲自每次运行它,删除isInMultiWindowMode()分支,因为
isInMultiWindowMode()