Android兼容性優化-Android 8.0設置Activity透明主題崩潰

崩潰日誌：

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)
拋出異常信息：
Only fullscreen opaque activities can request orientation
Android8.0源碼Activity.java:
https://www.androidos.net.cn/android/8.0.0_r4/xref/frameworks/base/core/java/android/app/Activity.java

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方向固定並且是透明(或者浮動)，則會拋異常。
            if (isTranslucentOrFloating) {
                throw new IllegalStateException(
                        "Only fullscreen opaque activities can request orientation");
            }
        }
        ...
    }
查看ActivityInfo.java的isTranslucentOrFloating()方法：https://www.androidos.net.cn/android/8.0.0_r4/xref/frameworks/base/core/java/android/content/pm/ActivityInfo.java
//檢查Activity方式是否是透明或者是浮動的
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;
    }
解決方法:
1、降級targetSDKVersion到26以下(廢話！！)
2、移除mainfest文件裡的screenOrientation屬性
3、取消Activity主題裡的windowIsTranslucent屬性或者windowSwipeToDismiss屬性或者windowIsFloating屬性（根據你設置了什麼屬性來具體分析）
4、移除manifest文件裡的screenOrientation屬性，並在Activity的onCreate方法裡設置屏幕方向
if (Build.VERSION.SDK_INT != Build.VERSION_CODES.O) {
	setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}