应该是会多次解析，影响性能

public class MainActivity extends Activity {
    private static final String TAG = MainActivity.class.getSimpleName();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
    }
    
    public void buttonClick(View v){
        long startTime = System.currentTimeMillis();
        for (int i = 0, length = 1000; i < length; i++) {
            View view = LayoutInflater.from(this).inflate(R.layout.activity_main, null);
        }
        Log.i(TAG, "during time = " + (System.currentTimeMillis() - startTime));
    }
}

源代码里没有看到做缓存。
然后我写了个demo测试，1000次调用耗时1699ms， 100次调用耗时188ms