android程式設計實例入門 -Sample改寫分享 (2014/09/26)

android程式設計實例入門 -Sample改寫分享 (2014/09/26)

 

此範例為程式碼(04\Sample10)的改寫，利用一個LinearLayout、一個TextView和一個ListView實作GUI界面，並且實作自訂ArrayAdapter用來改變ListView顯示狀態的基本應用，程式碼如下所示：

 

package com.jashsample;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnKeyListener;
import android.graphics.Color;
import android.graphics.Typeface;
import android.text.method.KeyListener;
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.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;
/*
 * 自訂ArrayAdapter+ListView的基本應用，自訂ArrayAdapter，如此才可以控制顯示內容。
 */
public class MainActivity extends Activity {
	TextView tv;
	ListView lv;
	@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。");
	            
	      lv = new ListView(this);
	      String[] str = {"汽車","卡車","敞篷車",
	    		          "計程車","跑車","金龜車",
	    		          "腳踏車","三輪車","摩��車",
	    		          "飛機","直升機","火箭"};  
	      SampleAdapter ad = new SampleAdapter(this, android.R.layout.simple_list_item_1, str);//自訂ArrayAdapter，如此才可以控制顯示內容
	      lv.setAdapter(ad);
	      
	      ll.addView(tv);
	      ll.addView(lv);
	      
	      lv.setOnItemClickListener(new SampleItemClickListener());
	}
	class SampleAdapter extends ArrayAdapter<String>
	{
		public SampleAdapter(Context cn, int textViewResourceId,String[] objects)
		{
			super(cn, textViewResourceId, objects);
		}
		public View getView(int pos, View convView, ViewGroup parent)//設定內容顯示狀態
		{
			ListView l = (ListView) parent;
			String s = "---------" + l.getItemAtPosition(pos) ;

			TextView t = new TextView(getBaseContext());
			t.setText(pos + s);
			t.setTextSize(20);
	         
			if(pos % 2 == 0)
			{
				t.setBackgroundColor(Color.WHITE);
				t.setTextColor(Color.BLACK);
			}
			convView = t;

			return convView;
		}
	   }
	/*
    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;
	}
	@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 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)
		{
	    	 RadioButton tmp = (RadioButton) v;
	         tv.setText("我要買" + tmp.getText() + "。");
	         tmp.setChecked(true);
		}
	} 
}