原文连贯：https://mp.weixin.qq.com/s/g6...
解体日志：
1 java.lang.RuntimeException:Unable to start activity ComponentInfo{com.pxwx.assistant/com.pxwx.main.ui.MainActivity}: java.lang.IllegalStateException: Only fullscreen opaque activities can request orientation2 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)3 ......4 Caused by:5 java.lang.IllegalStateException:Only fullscreen opaque activities can request orientation6 android.app.Activity.onCreate(Activity.java:1038)7 androidx.core.app.ComponentActivity.onCreate(Unknown Source:0)8 androidx.activity.ComponentActivity.onCreate(Unknown Source:0)9 androidx.fragment.app.FragmentActivity.onCreate(Unknown Source:99)10 androidx.appcompat.app.AppCompatActivity.onCreate(Unknown Source:10)11 com.pxwx.base.activity.BaseActivity.onCreate(Unknown Source:0)12 com.pxwx.main.ui.MainActivity.onCreate(Native Method)13 android.app.Activity.performCreate(Activity.java:7183)14 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1221)15 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)16 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)17 android.app.ActivityThread.-wrap11(Unknown Source:0)18 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)19 android.os.Handler.dispatchMessage(Handler.java:105)20 android.os.Looper.loop(Looper.java:164)21 android.app.ActivityThread.main(ActivityThread.java:6942)22 java.lang.reflect.Method.invoke(Native Method)23 com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)24 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)抛出异样信息：
Only fullscreen opaque activities can request orientation
Android8.0源码Activity.java:
https://www.androidos.net.cn/...
protected void onCreate(@Nullable Bundle savedInstanceState) { if (DEBUG_LIFECYCLE) Slog.v(TAG, "onCreate " + this + ": " + savedInstanceState); if (getApplicationInfo().targetSdkVersion > O && mActivityInfo.isFixedOrientation()) { final TypedArray ta = obtainStyledAttributes(com.android.internal.R.styleable.Window); final boolean isTranslucentOrFloating = ActivityInfo.isTranslucentOrFloating(ta); ta.recycle(); //如果Activity方向固定并且是通明(或者浮动)，则会抛异样。 if (isTranslucentOrFloating) { throw new IllegalStateException( "Only fullscreen opaque activities can request orientation"); } } ... }查看ActivityInfo.java的isTranslucentOrFloating()办法：
https://www.androidos.net.cn/...
//查看Activity形式是否是通明或者是浮动的public static boolean isTranslucentOrFloating(TypedArray attributes) { final boolean isTranslucent = attributes.getBoolean(com.android.internal.R.styleable.Window_windowIsTranslucent, false); final boolean isSwipeToDismiss = !attributes.hasValue( com.android.internal.R.styleable.Window_windowIsTranslucent) && attributes.getBoolean( com.android.internal.R.styleable.Window_windowSwipeToDismiss, false); final boolean isFloating = attributes.getBoolean(com.android.internal.R.styleable.Window_windowIsFloating, false); return isFloating || isTranslucent || isSwipeToDismiss; }解决办法:
1、降级targetSDKVersion到26以下(废话！！)2、移除mainfest文件里的screenOrientation属性
3、勾销Activity主题里的windowIsTranslucent属性或者windowSwipeToDismiss属性或者windowIsFloating属性（依据你设置了什么属性来具体分析）
==4、移除manifest文件里的screenOrientation属性，并在Activity的onCreate办法里设置屏幕方向==
if (Build.VERSION.SDK_INT != Build.VERSION_CODES.O) { setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);}关注我的技术公众号