<activity android:name=".MainActivity"

            android:configChanges="orientation|keyboardHidden|screenSize"

            >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

package com.kkrs.change;

import android.content.pm.ActivityInfo;

import android.content.res.Configuration;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private Button change;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        change = (Button)findViewById(R.id.change);

        Log.e("sys","onCreate");

    }

    @Override

    protected void onStart() {

        super.onStart();

        Log.e("sys","onStart");

        change.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View view) {

                Log.d("sys","被点击了");

                //判断当前屏幕方向

                if(getRequestedOrientation() == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {

                    //切换竖屏

                    MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

                }else{

                    //切换横屏

                    MainActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

                }

            }

        });

    }

    //横竖屏切换

    @Override

    public void onConfigurationChanged(Configuration newConfig) {

        super.onConfigurationChanged(newConfig);

        Log.e("sys","onConfigurationChanged");

    }

    @Override

    protected void onStop() {

        super.onStop();

        Log.e("sys","onStop");

    }

    @Override

    protected void onResume() {

        super.onResume();

        Log.e("sys","onResume");

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        Log.e("sys","onDestroy");

    }

}