Android 横竖屏

阳光穿透心脏的1/2处 2022-06-18 11:37 225阅读 0赞

部分网友会发现Activity在切换到后台或布局从横屏LANDSCAPE切换到PORTRAIT，会重新切换Activity会触发一次onCreate方法，我们可以在androidmanifest.xml中的activit元素加入这个属性Android:configChanges="orientation|keyboardHidden" 即可，比如   
<activity android:name=".android123" android:configChanges="orientation|keyboardHidden" android:label="@string/app\_name">   
Java代码

复制代码代码如下:

/\* 声明Display对象，以取得屏幕宽高 \*/  
final Display defaultDisplay = getWindow().getWindowManager()  
.getDefaultDisplay();  
  
intScreenH = defaultDisplay.getHeight();  
intScreenW = defaultDisplay.getWidth();  
  
/\* 如果为Landscape \*/  
if (intScreenW > intScreenH)  
\{  
/\* Landscape => Portrait \*/  
setRequestedOrientation(ActivityInfo.SCREEN\_ORIENTATION\_PORTRAIT);  
\} else  
\{  
/\* Portrait => Landscape \*/  
setRequestedOrientation(ActivityInfo.SCREEN\_ORIENTATION\_LANDSCAPE);  
\}  
/\* 声明Display对象，以取得屏幕宽高 \*/  
final Display defaultDisplay = getWindow().getWindowManager()  
.getDefaultDisplay();  
intScreenH = defaultDisplay.getHeight();  
intScreenW = defaultDisplay.getWidth();  
/\* 如果为Landscape \*/  
if (intScreenW > intScreenH)  
\{  
/\* Landscape => Portrait \*/  
setRequestedOrientation(ActivityInfo.SCREEN\_ORIENTATION\_PORTRAIT);  
\} else  
\{  
/\* Portrait => Landscape \*/  
setRequestedOrientation(ActivityInfo.SCREEN\_ORIENTATION\_LANDSCAPE);  
\}

同时在Activity的Java文件中重载onConfigurationChanged(Configuration newConfig)这个方法，这样就不会在布局切换或窗口切换时重载onCreate等方法。代码如下:   
Java代码

复制代码代码如下:

@Override  
public void onConfigurationChanged(Configuration newConfig)  
\{  
super.onConfigurationChanged(newConfig);  
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION\_LANDSCAPE)  
\{  
//land  
\}  
else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION\_PORTRAIT)  
\{  
//port  
\}  
\}  
@Override  
public void onConfigurationChanged(Configuration newConfig)  
\{  
super.onConfigurationChanged(newConfig);  
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION\_LANDSCAPE)  
\{  
//land  
\}  
else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION\_PORTRAIT)  
\{  
//port  
\}  
\}