<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">

    <TextView
        android:id="@+id/configuration_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

package com.jinyu.cqkxzsxy.android.widgetsample;

import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import android.widget.Toast;

public class SystemEventActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.system_event_layout);
        // 获取界面组件
        TextView configurationTv = (TextView) findViewById(R.id.configuration_tv);

        // 获取系统的Configuration对象
        Configuration cfg = getResources().getConfiguration();

        // 获取系统的配置信息
        StringBuffer status = new StringBuffer();
        status.append("屏幕密度：" + cfg.densityDpi + "\n");
        status.append("字体缩放因子：" + cfg.fontScale + "\n");
        status.append("硬键盘是否可见：" + cfg.hardKeyboardHidden + "\n");
        status.append("键盘类型：" + cfg.keyboard + "\n");
        status.append("当前键盘是否可用：" + cfg.keyboardHidden + "\n");
        status.append("语言环境：" + cfg.locale + "\n");
        status.append("移动信号的国家码：" + cfg.mcc + "\n");
        status.append("移动信号的网络码：" + cfg.mnc + "\n");
        status.append("方向导航设备的类型：" + cfg.navigation + "\n");
        status.append("方向导航设备是否可用：" + cfg.navigationHidden + "\n");
        status.append("系统屏幕的方向：" + cfg.orientation + "\n");
        status.append("屏幕可用高：" + cfg.screenHeightDp + "\n");
        status.append("屏幕可用宽：" + cfg.screenWidthDp + "\n");
        status.append("系统触摸屏的触摸方式：" + cfg.touchscreen + "\n");
        status.append("screenLayout：" + cfg.screenLayout + "\n");
        status.append("smallestScreenWidthDp：" + cfg.smallestScreenWidthDp + "\n");
        status.append("uiMode：" + cfg.uiMode + "\n");

        // 配置信息输出
        configurationTv.setText(status.toString());
    }

    // 重写onConfigurationChanged方法，用于监听系统设置的更改
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        // 获取更改后的屏幕方向
        int screen = newConfig.orientation;
        String ori = (Configuration.ORIENTATION_LANDSCAPE == screen) ? "横屏" : "竖屏";

        // 消息提示
        Toast.makeText(this, "系统的屏幕方向改变为：" + ori, Toast.LENGTH_SHORT).show();
    }
}

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

    <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=".SystemEventActivity"
            android:configChanges="orientation|screenSize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

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