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();
}
}
}