ex04.java

Google Android应用框架原理与程序设计 第三版(中文高清PDF)高焕堂

package com.misoo.ex04;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class ex04 extends Activity {
    /** Called when the activity is first created. */
	private final int WC = LinearLayout.LayoutParams.WRAP_CONTENT; 
	
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        LinearLayout layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
       
        Button btn = new Button(this);
        btn.setText("OK");
        btn.setOnClickListener(listener);
        LinearLayout.LayoutParams param = 
               new LinearLayout.LayoutParams(WC, WC);
        layout.addView(btn, param);
        //------------------------------------------
        Button btn2 = new Button(this);
        btn2.setText("Exit");
        btn2.setOnClickListener(listener2);
        layout.addView(btn2, param);
        //-------------------------------------------------
        LinearLayout out_layout = new LinearLayout(this);
        out_layout.setOrientation(LinearLayout.HORIZONTAL);
        Button btn3 = new Button(this);
        btn3.setText("Cancel");
        btn3.setTextColor(Color.WHITE);
        btn3.setBackgroundColor(Color.RED);
        btn3.setOnClickListener(listener3);
        out_layout.addView(layout, param);
        out_layout.addView(btn3, param);
        //-------------------------------------------------       
        setContentView(out_layout);
   }

OnClickListener listener = new OnClickListener()
{
	public void onClick(View v) {
		setTitle("this is OK button");
     } 
  };
OnClickListener listener2 = new OnClickListener()
  {
  	public void onClick(View v) {
       finish();
       } 
    };
OnClickListener listener3 = new OnClickListener()
    {
    	public void onClick(View v){
    		setTitle("this is Cancel button");
         } 
      };
}