问题
Hi I have a floating window in which my floating window serves as the video and it also have a controls inside the video which under the floating window
Now my question is it possible that I can rotate my custom view from floating window only without affecting the orientation of my activity
If someone already tried it please guide me towards it.
Thank you.
回答1:
I have never done it before. But I have an idea. You can use the below code to get the current orientation of the screen on your device.
OrientationEventListener onrientationEventListener = new OrientationEventListener(context, SensorManager.SENSOR_DELAY_UI) {
@Override
public void onOrientationChanged(int rotation) {
Logger.e("Orientation: " + rotation);
}
};
And after that, depends on the value of "rotation", you can use rotate animation in Android to rotate your custom view.
@Beginer: Here is the code I implemented it. I used the above code in my custom view in my small camera app. It helps me to know which degree should I rotate the bitmap after taken. The toScreenOrientation() method bellow return a value in degrees (0, 90, 180, 270) you also modify it by yourself(whatever you want).
Using setOrientationChangedListener() method to help the parent(Activity, Fragment, etc.) receives a callback also.
public class TakePhotoView extends ConstraintLayout {
private static final int SCREEN_ORIENTATION_0 = 0;
private static final int SCREEN_ORIENTATION_90 = 90;
private static final int SCREEN_ORIENTATION_180 = 180;
private static final int SCREEN_ORIENTATION_270 = 270;
private OnOrientationChangedListener mOnOrientationChangedListener;
private OrientationEventListener mOrientationEventListener;
private int mScreenRotation;
public TakePhotoView(Context context) {
this(context, null);
}
public TakePhotoView(Context context, AttributeSet attrs) {
super(context, attrs);
//....do something here
mOrientationEventListener = new OrientationEventListener(context, SensorManager.SENSOR_DELAY_UI) {
@Override
public void onOrientationChanged(int rotation) {
Logger.e("Orientation: " + rotation);
if (rotation == OrientationEventListener.ORIENTATION_UNKNOWN) {
mScreenRotation = DEFAULT_SCREEN_ROTATION;
return;
}
mScreenRotation = rotation;
if(mOnOrientationChangedListener != null){
mOnOrientationChangedListener.onOrientationChanged(rotation);
}
}
};
}
private void takePhoto(Camera camera) {
if (camera != null) {
camera.takePicture(null, null, mPictureCallback);
}
}
private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
final int screenRotation = mScreenRotation;
int rotate = toScreenOrientation(screenRotation);
// Rotate/Flip the bitmap depends on the 'rotate' value
}
};
/**
* Converts sensor rotation in degrees to screen orientation constants.
*
* @param rotation sensor rotation angle in degrees
* @return Screen orientation angle in degrees (0, 90, 180, 270).
*/
private int toScreenOrientation(int rotation) {
if (rotation > 290 || rotation <= 70) {
return SCREEN_ORIENTATION_0;
} else if (rotation > 70 && rotation <= 110) {
return SCREEN_ORIENTATION_90;
} else if (rotation > 110 && rotation <= 250) {
return SCREEN_ORIENTATION_180;
} else {
return SCREEN_ORIENTATION_270;
}
}
public void setOrientationChangedListener(OnOrientationChangedListener orientationChangedListener){
this.mOnOrientationChangedListener = orientationChangedListener;
}
////////////////////////////////////////////////////////////////////////////////////////////////
// Interfaces
////////////////////////////////////////////////////////////////////////////////////////////////
public interface OnOrientationChangedListener {
void onOrientationChanged(int rotation);
}
}
Can I use this listener even I disable rotation in my manifest? -> It still works fine.
Hope it helps.
回答2:
Looks like you do not want your Activity to be recreated on device rotation. If so, then add configChanges attribute in AndroidManifest:
<activity
...
android:configChanges="orientation" >
This will stop activity recreation on rotation. But in your activity you can check that device has been rotated in onConfigurationChanged() method:
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
...
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
...
}
}
Do not forget to read android developer guides. ;)
回答3:
I have found a way to do this but I used alertDailog. The logic will be the same for all views.
AlertDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.stack_overflow2);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
AlertDialog.Builder alert123 = new AlertDialog.Builder(StackOverflow2.this);
View current_view = getLayoutInflater().inflate(R.layout.password_alert,null);
l2 = current_view.findViewById(R.id.linearView);
// Here l2 is linear layout getting root layout of password_alert
alert123.setView(current_view);
dialog = alert123.create();
dialog.show();
OrientationEventListener onrientationEventListener = new OrientationEventListener(getBaseContext(), SensorManager.SENSOR_DELAY_UI) {
@Override
public void onOrientationChanged(int rotation) {
Log.e("Orientation: " , String.valueOf(rotation));
if(rotation==270 || rotation==90)
{
if(rotation==270)
{
l2.setRotation(90);
}
else
{
l2.setRotation(270);
}
dialog.getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
Toast.makeText(StackOverflow2.this, "Change Dialog Rotation", Toast.LENGTH_SHORT).show();
}
else
{
if(rotation==180)
{
l2.setRotation(180);
}
else
{
l2.setRotation(0);
}
Toast.makeText(StackOverflow2.this, "Normal Display to Occur", Toast.LENGTH_SHORT).show();
}
}
};
if (onrientationEventListener.canDetectOrientation()) {
Log.v("ORIE", "Can detect orientation");
onrientationEventListener.enable();
} else {
Log.v("ORIE", "Cannot detect orientation");
onrientationEventListener.disable();
}
}
Here are some pictures : 0 Degree
90 Degree
270 Degree
As you can see the background activity is in potrait mode always. The alert dialog's height and width is a little off but you can change your view's dimensions differently. I hope this code solves your problem.
来源：https://stackoverflow.com/questions/46417417/rotate-customview-without-affecting-the-activity