개고생 샘플

package com.example.helloworld;

import java.util.zip.Inflater;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

Context context;
Button btn;
int flag;
// Context context = this;
// @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = this;
flag=1;
// LayoutInflater inflater = (LayoutInflater)context.getSystemService
//      (Context.LAYOUT_INFLATER_SERVICE);
//
// LinearLayout layout = (LinearLayout) inflater.inflate(R.id.lilili, null);
//
// Button btn = new Button(this);
// btn.setPadding(7, 3, 7, 5);
// btn.setTextColor(Color.BLUE);
//
// layout.addView(btn);
//
// setContentView(R.layout.activity_main);
    LinearLayout linear = new LinearLayout(this);
    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.FILL_PARENT);
   
   
   
    linear.setBackgroundColor(Color.GREEN);
   
    RelativeLayout text = (RelativeLayout)View.inflate(this, R.layout.activity_main, null);
   
    btn = new Button(this);
    btn.setLayoutParams(params);
    btn.setText("Hello");
   
    btn.setText("Hi");
    btn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(context, "Button Clicked", 1).show();
   if(flag == 1) {
    btn.setText("Hello");
    flag=0;
   }
   else {
    btn.setText("hi");
    flag=1;
   }

}
});
   
    linear.addView(text, params);
    linear.addView(btn,params);
   
    setContentView(linear);
   

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}