将以下内容添加到您的AndroidManifest.xml

[应用程序> src > main > AndroidManifest.xml]

<activity android:name=".MainActivity"
          android:configChanges="orientation"
          android:screenOrientation="portrait"/>

例子:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="xxx.zzzzzz.yyyyy">

   <uses-permission android:name="A-PERMISSION" />

   <application>
      <activity android:name=".MainActivity"
                android:screenOrientation="portrait"
                android:configChanges="orientation">
      </activity>
   </application>

</manifest>

我发现最简单的方法就是把

this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

在onCreate中，就在后面

setContentView(R.layout.activity_main);

所以…

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

android: screenOrientation =“肖像” 在应用程序标签<application

and

<活动 .．. .．. android: screenOrientation = "锁定" >

防止屏幕旋转只需在清单中添加以下一行。

<activity
        android:name=".YourActivity"
        android:screenOrientation="portrait" />

这对我很有用。

你可以试试这种方法

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itclanbd.spaceusers">

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".Login_Activity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

将以下内容添加到您的AndroidManifest.xml

[应用程序> src > main > AndroidManifest.xml]

<activity android:name=".MainActivity"
          android:configChanges="orientation"
          android:screenOrientation="portrait"/>

例子:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="xxx.zzzzzz.yyyyy">

   <uses-permission android:name="A-PERMISSION" />

   <application>
      <activity android:name=".MainActivity"
                android:screenOrientation="portrait"
                android:configChanges="orientation">
      </activity>
   </application>

</manifest>