这是学习Android来第一个完整的Android程序。
主要功能是实现秒表计时,功能简介如下:
简介:计时器小程序——秒表计时器,程序界面简洁,只有一个时间显示区域和两个图片按钮,一个按钮是开始/暂停,另一个按钮是停止。
1.功能:
(1)根据用户设置.按0.1秒或1秒为最小单位计时,满60秒进为分钟,最大单位是分钟。
默认分钟为两位,超过两位后自动变为三位分钟。
(2).显示格式为
1.最小计时单位为0.1秒时,显示为:分钟:秒:0.1秒。例如:02:07:5
2.最小计时单位为1秒时,显示为:分钟:秒。例如:02:07
2.操作步骤
(1).按开始按钮,开始计时,此时开始按钮变为暂停按钮
(2).按暂停按钮,暂停计时,显示当前的计时时间
(3).按停止按钮,停止计时,暂停按钮恢复为开始按钮,时间显示为:00:00:00
(4)按menu键弹出menu菜单,第一项为设置计时单位,含有子菜单,可以设置计时单位为1秒或者为0.1秒。
画面显示如下所示:
2.计时单位设置子菜单
主要代码如下:
1.MyTimer.java
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SubMenu;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
public class MyTimer extends Activity {
private long mlCount = 0;
private long mlTimerUnit = 100;
private TextView tvTime;
private ImageButton btnStartPause;
private ImageButton btnStop;
private Timer timer = null;
private TimerTask task = null;
private Handler handler = null;
private Message msg = null;
private boolean bIsRunningFlg = false;
private static final String MYTIMER_TAG = "MYTIMER_LOG";
// menu item
private static final int SETTING_TIMER_UNIT_ID = Menu.FIRST;
private static final int ABOUT_ID = Menu.FIRST + 1;
private static final int EXIT_ID = Menu.FIRST + 2;
private static final int SETTING_SECOND_ID = Menu.FIRST + 101;
private static final int SETTING_100MILLISECOND_ID = Menu.FIRST + 102;
// Setting timer unit flag
private int settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvTime = (TextView)findViewById(R.id.tvTime);
btnStartPause = (ImageButton)findViewById(R.id.btnStartPaunse);
btnStop = (ImageButton)findViewById(R.id.btnStop);
SharedPreferences sharedPreferences = getSharedPreferences("mytimer_unit", Context.MODE_PRIVATE);
//getString()第二个参数为缺省值,如果preference中不存在该key,将返回缺省值
mlTimerUnit = sharedPreferences.getLong("time_unit", 100);
Log.i(MYTIMER_TAG, "mlTimerUnit = " + mlTimerUnit);
if (1000 == mlTimerUnit) {
// second
settingTimerUnitFlg = SETTING_SECOND_ID;
tvTime.setText(R.string.init_time_second);
} else if (100 == mlTimerUnit) {
// 100 millisecond
settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
tvTime.setText(R.string.init_time_100millisecond);
}
// Handle timer message
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch(msg.what) {
case 1:
mlCount++;
int totalSec = 0;
int yushu = 0;
if (SETTING_SECOND_ID == settingTimerUnitFlg) {
// second
totalSec = (int)(mlCount);
} else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
// 100 millisecond
totalSec = (int)(mlCount / 10);
yushu = (int)(mlCount % 10);
}
// Set time display
int min = (totalSec / 60);
int sec = (totalSec % 60);
try{
if (SETTING_SECOND_ID == settingTimerUnitFlg) {
// second(1000ms)
tvTime.setText(String.format("%1$02d:%2$02d", min, sec));
} else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
// 100 millisecond
tvTime.setText(String.format("%1$02d:%2$02d:%3$d", min, sec, yushu));
}
} catch(Exception e) {
tvTime.setText("" + min + ":" + sec + ":" + yushu);
e.printStackTrace();
Log.e("MyTimer onCreate", "Format string error.");
}
break;
default:
break;
}
super.handleMessage(msg);
}
};
btnStartPause.setOnClickListener(startPauseListener);
btnStop.setOnClickListener(stopListener);
}
// Start and pause
View.OnClickListener startPauseListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i(MYTIMER_TAG, "Start/Pause is clicked.");
if (null == timer) {
if (null == task) {
task = new TimerTask() {
@Override
public void run() {
// TODO Auto-generated method stub
if (null == msg) {
msg = new Message();
} else {
msg = Message.obtain();
}
msg.what = 1;
handler.sendMessage(msg);
}
};
}
timer = new Timer(true);
timer.schedule(task, mlTimerUnit, mlTimerUnit); // set timer duration
}
// start
if (!bIsRunningFlg) {
bIsRunningFlg = true;
btnStartPause.setImageResource(R.drawable.pause);
} else { // pause
try{
bIsRunningFlg = false;
task.cancel();
task = null;
timer.cancel(); // Cancel timer
timer.purge();
timer = null;
handler.removeMessages(msg.what);
btnStartPause.setImageResource(R.drawable.start);
} catch(Exception e) {
e.printStackTrace();
}
}
}
};
// Stop
View.OnClickListener stopListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i(MYTIMER_TAG, "Stop is clicked.");
if (null != timer) {
task.cancel();
task = null;
timer.cancel(); // Cancel timer
timer.purge();
timer = null;
handler.removeMessages(msg.what);
}
mlCount = 0;
bIsRunningFlg = false;
btnStartPause.setImageResource(R.drawable.start);
if (SETTING_SECOND_ID == settingTimerUnitFlg) {
// second
tvTime.setText(R.string.init_time_second);
} else if (SETTING_100MILLISECOND_ID == settingTimerUnitFlg) {
// 100 millisecond
tvTime.setText(R.string.init_time_100millisecond);
}
}
};
// Menu
@Override
public boolean onCreateOptionsMenu(android.view.Menu menu) {
// TODO Auto-generated method stub
super.onCreateOptionsMenu(menu);
Log.i(MYTIMER_TAG, "Menu is created.");
// Stop timer
if (null != task) {
task.cancel();
task = null;
}
if (null != timer) {
timer.cancel(); // Cancel timer
timer.purge();
timer = null;
handler.removeMessages(msg.what);
}
bIsRunningFlg = false;
mlCount = 0;
btnStartPause.setImageResource(R.drawable.start);
// 设置子菜单的名称
SubMenu settingMenu = menu.addSubMenu(0, SETTING_TIMER_UNIT_ID, 0, R.string.menu_setting_timer_unit).setIcon(R.drawable.setting);
// 按对应的名称增加子菜单
// Sub menus do not support item icons, or nested sub menus.
settingMenu.add(1, SETTING_SECOND_ID, 0, R.string.menu_setting_second);
settingMenu.add(1, SETTING_100MILLISECOND_ID, 1, R.string.menu_setting_100milisec);
// About
menu.add(0, ABOUT_ID, 1, R.string.menu_about).setIcon(R.drawable.about);
// 退出
menu.add(0, EXIT_ID, 2, R.string.menu_exit).setIcon(R.drawable.exit);
return true;
}
// Menu item
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
Log.i(MYTIMER_TAG, "Menu item is selected.");
switch(item.getItemId()) {
case SETTING_TIMER_UNIT_ID:
break;
case ABOUT_ID:
// Display about dialog
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.app_name)
.setMessage("本程序由雨梦开发/n联系作者:minyugong@163.com")
.setCancelable(true)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
break;
case EXIT_ID:
finish(); // Exit application
break;
case SETTING_SECOND_ID: // 秒(1000ms)
if (SETTING_SECOND_ID != settingTimerUnitFlg) {
mlTimerUnit = 1000;
settingTimerUnitFlg = SETTING_SECOND_ID;
}
tvTime.setText(R.string.init_time_second);
break;
case SETTING_100MILLISECOND_ID: // 100毫秒
if (SETTING_100MILLISECOND_ID != settingTimerUnitFlg) {
mlTimerUnit = 100;
settingTimerUnitFlg = SETTING_100MILLISECOND_ID;
}
tvTime.setText(R.string.init_time_100millisecond);
break;
default:
Log.i(MYTIMER_TAG, "Other menu item...");
break;
}
// Save timer unit
try{
SharedPreferences sharedPreferences = getSharedPreferences("mytimer_unit", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();//获取编辑器
editor.putLong("time_unit", mlTimerUnit);
editor.commit();//提交修改
} catch(Exception e) {
e.printStackTrace();
Log.e(MYTIMER_TAG, "save timer unit error.");
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (KeyEvent.KEYCODE_MENU == keyCode) {
super.openOptionsMenu(); // 调用这个,就可以弹出菜单
Log.i(MYTIMER_TAG, "Menu key is clicked.");
// Stop timer
if (null != task) {
task.cancel();
task = null;
}
if (null != timer) {
timer.cancel(); // Cancel timer
timer.purge();
timer = null;
handler.removeMessages(msg.what);
}
bIsRunningFlg = false;
mlCount = 0;
btnStartPause.setImageResource(R.drawable.start);
return true;
}
return super.onKeyDown(keyCode, event);
}
}
2.main.xml
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" "
/>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:gravity="center"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:id="@+id/btnStartPaunse"
android:src="@drawable/start"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" "
/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:id="@+id/btnStop"
android:src="@drawable/stop"
/>
</LinearLayout>
</LinearLayout>
3.strings.xml
本程序安装文件下载地址:http://download.csdn.net/source/2606201