android程式設計實例入門 -Sample改寫分享 (2014/09/30)

android程式設計實例入門 -Sample改寫分享 (2014/09/30)

 

此範例為程式碼(04\Sample13)的改寫，利用一個LinearLayout、一個TextView和一個Button實作GUI界面，並且實作AlertDialog基本使用範例，程式碼如下所示：

 

 

package com.jashsample;

import java.text.SimpleDateFormat;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnKeyListener;
import android.graphics.Color;
import android.graphics.Typeface;
import android.text.format.DateFormat;
import android.text.method.KeyListener;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
/*
 * AlertDialog基本使用範例。
 */
public class MainActivity extends Activity {
	TextView tv;
	Button bt;
	@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。");
	      bt = new Button(this);
	      bt.setText("購買");

	      ll.addView(tv);
	      ll.addView(bt);
	 
	      bt.setOnClickListener(new SampleClickListener());
	}
	public boolean onCreateOptionsMenu1(Menu menu)
	{
		menu.add(Menu.NONE, 0, 0, "汽車");     
		menu.add(Menu.NONE, 1, 1, "計程車");
		menu.add(Menu.NONE, 2, 2, "戰車");
		menu.add(Menu.NONE, 3, 3, "敞篷車");
		return super.onCreateOptionsMenu(menu);
	}
	public boolean onOptionsItemSelected(MenuItem mi)
	{
		String str = null;
		switch(mi.getItemId())
		{
			case 0:
				str = "汽車";
				break; 
			case 1:
				str = "計程車";
				break;   	 
			case 2:
				str = "戰車";
				break;         	 
			case 3:
				str = "敞篷車";
				break;  
		}
		tv.setText("��" + str + "對吧。");
		return true;   
	}
	/*
    public boolean onKey(View v, int keyCode, KeyEvent event)//當TextView有駐點時事件無效
    {
        tv.setText(et.getText());
        return false;
    }
    */
	class SampleItemSelectedListener implements OnItemSelectedListener
	{
		public void onItemSelected(AdapterView<?>v, View iv, int pos, long id)
		{
			TextView tmp = (TextView) iv;
			tv.setText("��" + tmp.getText() + "對吧。");
		}
		public void onNothingSelected(AdapterView<?> arg0){}
	} 
	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 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;
	}
	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 SampleItemClickListener implements OnItemClickListener
	{
		public void onItemClick(AdapterView<?>v, View iv, int pos, long id)
		{
			TextView tmp = (TextView) iv;
			tv.setText("��" + tmp.getText() + "對吧。");
		}
	}
	class SampleClickListener implements OnClickListener//按鈕事件反��類別
	{
		public void onClick(View v)
		{
	         new AlertDialog.Builder(MainActivity.this)
             .setTitle("購買")
             .setMessage("謝謝惠顧。")
             .setPositiveButton("OK", null).show();
		}
	} 
}