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Problem with camera when changing orientation

I am making an application that triggers another action when the orientation of the device changes from landscape to portrait or vice versa. Activity for landscape mode is augmented reality, so I use the camera to display the environment to the user. However, when I try to return to the portrait, the application crashes and displays this error:

08-17 16:05:42.622: ERROR/AndroidRuntime(9769): FATAL EXCEPTION: main 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): java.lang.RuntimeException: set display orientation failed 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.hardware.Camera.setDisplayOrientation(Native Method) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at es.ucm.look.ar.Preview.surfaceChanged(Preview.java:102) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.SurfaceView.updateWindow(SurfaceView.java:549) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.SurfaceView.setFrame(SurfaceView.java:294) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.View.layout(View.java:7169) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.View.layout(View.java:7175) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.View.layout(View.java:7175) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.widget.FrameLayout.onLayout(FrameLayout.java:338) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.View.layout(View.java:7175) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.ViewRoot.performTraversals(ViewRoot.java:1140) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.os.Handler.dispatchMessage(Handler.java:99) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.os.Looper.loop(Looper.java:130) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at android.app.ActivityThread.main(ActivityThread.java:3683) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at java.lang.reflect.Method.invokeNative(Native Method) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at java.lang.reflect.Method.invoke(Method.java:507) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 08-17 16:05:42.622: ERROR/AndroidRuntime(9769): at dalvik.system.NativeStart.main(Native Method)

Usually a change from portrait to landscape works.

This is my android manifest ("Emergency Calls" activity is the mode for portrait mode and "MapaMovilAR" for lanscape):

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.list" android:versionCode="1" android:versionName="1.0"> <uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:icon="@drawable/icon" android:label="@string/app_name" android:name="cl.puc.memoria.MapaMovilApplication"> <activity android:name="cl.puc.memoria.EmergenciesList" android:configChanges="orientation" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN"></action> <category android:name="android.intent.category.LAUNCHER"> </category> </intent-filter> </activity> <activity android:name="cl.puc.memoria.AR.MapaMovilAR" android:configChanges="orientation"> </activity> <activity android:name="es.ucm.look.ar.LookAR"></activity> </application> <uses-sdk android:minSdkVersion="7" /> </manifest>

And finally, this is the code for handling orientation changes:

 @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { Intent el = new Intent(MapaMovilAR.this, cl.puc.memoria.EmergenciesList.class); startActivity(el); } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) { Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show(); } }

Is there anything that could cause a crash?

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3 answers

Using:

 mCamera.stopPreview(); mCamera.setDisplayOrientation(mRotation); mCamera.startPreview();
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Camera.setDisplayOrientation can only use 0, 90, 180, 270

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there is usually a “due” line in the logcat error indication, can you see if it is there and turn it on if it is? This will help provide a deeper understanding.

When a change in orientation occurs, activity is killed. My initial guess is that you are setting a value that no longer works when you return to portrait mode. You can use the savedInstanceState package to transfer and save these changes.

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