android程式設計實例入門 -Sample改寫分享 (2014/09/15)

android程式設計實例入門 -Sample改寫分享 (2014/09/15)

 

此範例為程式碼(04\Sample1)的改寫，利用一個LinearLayout、一個TextView陣例實作GUI界面，並且利用Color物件實作TextView字型(前後景)顏色大小控制範例，程式碼如下所示：

 

 

package com.jashsample;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.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.LinearLayout;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
/*
 * 透過TextView陣列+Color物件實作TextView字型(前後景)顏色大小控制範例
 */
public class MainActivity extends Activity {
	TextView[] tv = new TextView[3];
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	      LinearLayout ll = new LinearLayout(this); 
	      ll.setOrientation(LinearLayout.VERTICAL);
	      setContentView(ll);
	      
	      for(int i=0; i<tv.length; i++)
	      {
	         tv[i] = new TextView(this);
	         tv[i].setText("需要買車子嗎？");
	      }
	      
	      tv[0].setTextColor(Color.BLACK);
	      tv[1].setTextColor(Color.BLUE);      
	      tv[2].setTextColor(Color.RED);
	      
	      tv[0].setBackgroundColor(Color.WHITE);
	      tv[1].setBackgroundColor(Color.GRAY);      
	      tv[2].setBackgroundColor(Color.WHITE);
	      
	      tv[0].setTextSize(12);
	      tv[1].setTextSize(14);      
	      tv[2].setTextSize(16);
	      
	      for(int i=0; i<tv.length; i++)
	      {          
	         ll.addView(tv[i]);
	      }
	}
	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";
				break;
			case KeyEvent.KEYCODE_DPAD_DOWN:
				str = "下";
				break;        	  
			case KeyEvent.KEYCODE_DPAD_LEFT:
				str = "左";
				break;      
			case KeyEvent.KEYCODE_DPAD_RIGHT:
				str = "右";
				break;      
			case KeyEvent.KEYCODE_DPAD_CENTER:
				str = "中央";
				break;
			default:
				str = "其他按鍵";
		}
		tv[0].setText("按下" + str + "。");
	      
		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[0].setText("您好再見");
		}
		else if(e.getAction() == MotionEvent.ACTION_UP)
		{
			tv[0].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[0].setText("您好");
	         }
	         else if(e.getAction() == MotionEvent.ACTION_UP)
	         {
	        	 tv[0].setText("再見");
	         }
	         return true;
	      }
	}
	class SampleClickListener implements OnClickListener//按鈕事件反��類別
	{
		public void onClick(View v)
		{
			tv[0].setText("謝謝惠顧。");
		}
	} 
}