我正在开发一个应用程序,当设备的方向从横屏变为竖屏或者反过来时,它会调用不同的活动。横屏模式下的活动是增强现实活动,因此我使用相机向用户展示周围的环境。然而,当我尝试返回到竖屏模式时,应用程序会崩溃并显示以下错误信息:
有什么原因可能导致崩溃吗?
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)
从纵向到横向的切换正常工作。
这是我的Android清单(活动“EmergenciesList”是纵向模式下的活动,“MapaMovilAR”是横向模式下的活动):
<?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>
最后,这是处理屏幕旋转的代码:
@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();
}
}
有什么原因可能导致崩溃吗?