带视图缓存的动态布局

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class PadTestActivity extends Activity {

    View chacheView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.main);

        LayoutInflater inflater = LayoutInflater.from(this);
        final View mainView = inflater.inflate(R.layout.main, null);
        // Add first page
        LinearLayout myFirst = (LinearLayout) inflater.inflate(R.layout.first, null).findViewById(R.id.myFirst);
        LinearLayout layoutFirst = (LinearLayout) mainView.findViewById(R.id.LayoutFirst);
        layoutFirst.removeAllViews();
        layoutFirst.addView(myFirst); // Show the page first
        
        // Add second page
        LinearLayout mySecond = (LinearLayout) inflater.inflate(R.layout.second, null).findViewById(R.id.mySecond);
        LinearLayout layoutSecond = (LinearLayout) mainView.findViewById(R.id.LayoutSecond);
        layoutSecond.removeAllViews();
        layoutSecond.addView(mySecond);
        
        // Add third page
        LinearLayout myThird = (LinearLayout) inflater.inflate(R.layout.third, null).findViewById(R.id.myThird);
        LinearLayout layoutThird = (LinearLayout) mainView.findViewById(R.id.LayoutThird);
        layoutThird.removeAllViews();
        layoutThird.addView(myThird);

        setContentView(mainView);
        
        chacheView = myFirst;

        Button btnDelete = (Button) mainView.findViewById(R.id.btnDelete);
        btnDelete.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

                LinearLayout layoutFirst = (LinearLayout) mainView.findViewById(R.id.LayoutFirst);
                layoutFirst.removeAllViews();
            }
        });
        
        Button btnAdd = (Button) mainView.findViewById(R.id.btnAdd);
        btnAdd.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                
                LinearLayout layoutFirst = (LinearLayout) mainView.findViewById(R.id.LayoutFirst);                
                if (chacheView != null) {
                    layoutFirst.addView(chacheView);
                }                            
            }
        });
    }
    
}