content: package com.ai.android.picker.test;
  
  import com.ai.android.picker.R;
  import com.ai.android.picker.R.id;
  import com.ai.android.picker.R.layout;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.view.View;
  
  public class SampleActivity extends Activity {
  
      /**
       * Called when the activity is first created.
       */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_samples);
  
          findViewById(R.id.btnDark).setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  startActivity(new Intent(SampleActivity.this, DarkThemeActivity.class));
              }
          });
  
          findViewById(R.id.btnLight).setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
                  startActivity(new Intent(SampleActivity.this, LightThemeActivity.class));
              }
          });
      }
  }
  