原文连接：mp.weixin.qq.com/s/g6RzzJIOp…
崩溃日志：
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 orientation
2 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
3 ......
4 Caused by:
5 java.lang.IllegalStateException:Only fullscreen opaque activities can request orientation
6 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)
抛出异常信息：
Only fullscreen opaque activities can request orientation
Android8.0源码Activity.java:
www.androidos.net.cn/android/8.0…
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方向固定并且是透明(或者浮动)，则会抛异常。
if (isTranslucentOrFloating) {
throw new IllegalStateException(
"Only fullscreen opaque activities can request orientation");
}
}
...
}
查看ActivityInfo.java的isTranslucentOrFloating()方法： www.androidos.net.cn/android/8.0…
//检查Activity方式是否是透明或者是浮动的
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;
}
解决方法:
1、降级targetSDKVersion到26以下(废话！！)
2、移除mainfest文件里的screenOrientation属性
3、取消Activity主题里的windowIsTranslucent属性或者windowSwipeToDismiss属性或者windowIsFloating属性（根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方法里设置屏幕方向==
if (Build.VERSION.SDK_INT != Build.VERSION_CODES.O) {
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
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