不設定Activity的android:configChanges時,切屏會重新調用各個生命週期
設定Activity的android:configChanges時,切屏不會重新調用聲明周期,只會執行onConfigurationChanged方法。
在android中每次螢幕的切換動會重啟Activity,所以應該在Activity銷毀前儲存當前活動的狀態,在Activity再次Create的時候載入配置。在activity加上android:configChanges="keyboardHidden|orientation"屬性,就不會重啟activity.而只是調用onConfigurationChanged(Configuration
newConfig).這樣就可以在這個方法裡調整顯示方式.
MainActivity中:
- public void onConfigurationChanged(Configuration newConfig) {
- try {
- super.onConfigurationChanged(newConfig);
- if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
- Log.v("Himi", "onConfigurationChanged_ORIENTATION_LANDSCAPE");
- } else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
- Log.v("Himi", "onConfigurationChanged_ORIENTATION_PORTRAIT");
- }
- } catch (Exception ex) {
- }
- }
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="com.himi" android:versionCode="1" android:versionName="1.0">
- <application android:icon="@drawable/icon" android:label="@string/app_name">
- <activity android:name=".MainActivity" android:label="@string/app_name"
- android:configChanges="keyboardHidden|orientation">
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
- </application>
- <uses-sdk android:minSdkVersion="4" />
- </manifest>