android程式設計實例入門 -Sample改寫分享 (2014/09/19)

android程式設計實例入門 -Sample改寫分享 (2014/09/19)

 

此範例為程式碼(04\Sample5)的改寫，利用一個LinearLayout、一個TextView和兩個RadioButton實作GUI界面，並且實作RadioButton事件反應和屬性設定範例，程式碼如下所示：

 

 

package com.jashsample;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
/*
 * RadioButton反應事件和屬性設定
 */
public class MainActivity extends Activity {
	TextView tv;
	RadioButton rb1, rb2;
	RadioGroup rg;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	      LinearLayout ll = new LinearLayout(this); 
	      ll.setOrientation(LinearLayout.VERTICAL);
	      setContentView(ll);
	      
	      tv = new TextView(this);
	      tv.setText("歡迎光臨。");

	      rb1 = new RadioButton(this);
	      rb2 = new RadioButton(this);
	      
	      rb1.setText("汽車");
	      rb2.setText("卡車");
	      
	      rg = new RadioGroup(this);
	      
	      rg.addView(rb1);
	      rg.addView(rb2);
	 
	      rb1.setChecked(false);//預設不要選擇
	      rb2.setChecked(false);
	     
	      ll.addView(tv);
	      ll.addView(rg);
	      
	      rb1.setOnClickListener(new SampleClickListener());
	      rb2.setOnClickListener(new SampleClickListener());
	}
	class SampleCheckedChangeListener implements OnCheckedChangeListener
	{
		public void onCheckedChanged(CompoundButton cb, boolean isChecked)
		{
			if(isChecked == true)
	        {
	           tv.setText("我要買" + cb.getText() + "。");
	        }
	        else if(isChecked == false)
	        {
	           tv.setText("我不買" + cb.getText() + "了。");
	        }         
		}
	}  
	public boolean onKeyDown(int keycode, KeyEvent e)//直接在Activity上實作KeyDown事件
	{
		String str="";
		switch(keycode)
		{
			case KeyEvent.KEYCODE_DPAD_UP:
				str = "上";
				tv.setText("按" + str + "。");
				break;
			case KeyEvent.KEYCODE_DPAD_DOWN:
				str = "下";
				tv.setText("按" + str + "。");
				break;        	  
			case KeyEvent.KEYCODE_DPAD_LEFT:
				str = "左";
				tv.setText("按" + str + "。");
				break;      
			case KeyEvent.KEYCODE_DPAD_RIGHT:
				str = "右";
				tv.setText("按" + str + "。");
				break;
			case KeyEvent.KEYCODE_BACK:
				this.finish();//關閉自己
				break;
		}
		
	      
		return true;
	}
	public boolean onTouchEvent(MotionEvent e)//直接在Activity上實作Touch事件
	{
		if(e.getAction() == MotionEvent.ACTION_DOWN)//設定在畫面任何地方Touch都改變tv文字
		{
			tv.setText("您好再見");
		}
		else if(e.getAction() == MotionEvent.ACTION_UP)
		{
			tv.setText("再見您好");
		}
		return true;
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	class SampleTouchListener implements OnTouchListener
	{
		public boolean onTouch(View v, MotionEvent e)
		{
			if(e.getAction() == MotionEvent.ACTION_DOWN)
	    	 {
				tv.setText("您好");
	         }
	         else if(e.getAction() == MotionEvent.ACTION_UP)
	         {
	        	 tv.setText("再見");
	         }
	         return true;
	      }
	}
	class SampleClickListener implements OnClickListener//按鈕事件反��類別
	{
		public void onClick(View v)
		{
			 rb1.setChecked(false);
			 rb2.setChecked(false);
	    	 RadioButton tmp = (RadioButton) v;
	         tv.setText("我要買" + tmp.getText() + "。");
	         tmp.setChecked(true);
		}
	} 
}