横竖屏切换

• activity 会被销毁
• 通过修改配置实现,横竖屏切换不销毁 android:configChanges="orientation|keyboardHidden|screenSize"
  • 横竖屏切换|键盘隐藏显示|屏幕尺寸发生改变
• 写死横竖屏
  • 横屏模式 android:screenOrientation="landscape"
  • 竖屏模式 android:screenOrientation="portrait"
  • 还可以通过代码来实现,且代码实现的优先级高于xml中配置的,采用就近原则

<activity
            android:screenOrientation="landscape"
            android:configChanges="orientation|keyboardHidden|screenSize"
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity> 

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //设置为竖屏
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); //设置为横屏
        System.out.println("主 onCreate 调用");
    }