Android Activity onConfigurationChanged()方法 监听状态改变

AndroidManifest.xml文件：
1.增加权限android.permission.CHANGE_CONFIGURATION
2.设置Activity的android:configChanges属性

<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
<application>
        <activity
            android:name=".MainActivity"
            android:configChanges="orientation|screenSize"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            intent-filter>
        activity>
application>

android:screenOrientation="portrait" 禁止横竖屏切换
重写Activity中的onConfigurationChanged方法。

     * If any configuration change occurs that is not selected to be reported
     * by that attribute, then instead of reporting it the system will stop
     * and restart the activity (to have it launched with the new
     * configuration).
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        Logger.d("onConfigurationChanged=====" + newConfig.toString());
    }

如果设置android:configChanges="orientation|screenSize"，手机屏幕旋转会执行onConfigurationChanged()方法，否则会重启当前activity。
参考https://blog.csdn.net/chencehnggq/article/details/23736869