Android 屏幕旋转监听

public class MainActivity extends Activity  {



   App tool;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        tool=new App(MainActivity.this);

       Button dialogButton=(Button)findViewById(R.id.dialog);
       dialogButton.setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View view) {
            tool.showDialog();
         }
      });
      Button changeButton=(Button)findViewById(R.id.changeButton);
      changeButton.setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View view) {
            Configuration configuration=getResources().getConfiguration();
            if(configuration.orientation==Configuration.ORIENTATION_LANDSCAPE)
               MainActivity.this.setRequestedOrientation(
                     ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            else MainActivity.this.setRequestedOrientation
                  (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

         }
      });
   }
   @Override
   public void onConfigurationChanged(Configuration newConfig){
      super.onConfigurationChanged(newConfig);
      String string=newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE
            ? "Landscape":"Portrait";
      tool.di(string);
      Toast.makeText(MainActivity.this,string,Toast.LENGTH_SHORT).show();
   }
}