摘要：

这一篇主要使用系统为我们提供的一个服务AlarmManager来制作一个Android小闹钟，同时还涉及到了自定义主题、判断第一次启动应用、自定义动画、对话框、制作指导滑动页面等方面。最后形成一个可以直接在手机上面使用的小闹钟。

开始启动界面AppStart.java

package com.example.alarmtest;import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.LinearLayout;public class AppStart extends Activity{public static final String PACKAGE_NAME = "com.example.alarmtest";public static final String VERSION_KEY = "versionCode";SharedPreferences preferences;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);//判断是否是首次安装/** 判断应用首次运行 **/preferences = getSharedPreferences("count",MODE_WORLD_READABLE);int count = preferences.getInt("start_count", 0);if(count == 0){Editor editor = preferences.edit();//存入数据editor.putInt("start_count", ++count);//提交修改 editor.commit();Intent intent = new Intent(AppStart.this, GuideActivity.class);startActivity(intent);AppStart.this.finish();}else{LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);LinearLayout linearLayout = new LinearLayout(this);linearLayout.setLayoutParams(params);linearLayout.setOrientation(LinearLayout.VERTICAL);linearLayout.setBackgroundResource(R.drawable.main_bg_default_img_2);new Handler().postDelayed(new Runnable(){@Overridepublic void run(){Intent intent = new Intent (AppStart.this, MainActivity.class);         startActivity(intent);          AppStart.this.finish();}}, 1000);setContentView(linearLayout);}     }
}

上面使用sharedPreference中的默认设值来判断该应用是否是第一次启动，如果是第一次启动则启动GuidActivity进入指导页面，如果不是第一次启动则启动MainActivity进入主界面。

先看看GuidActivity的实现

package com.example.alarmtest;import java.util.ArrayList;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;/*** 第一次安装引导用户的Activity* @author lixq**/
public class GuideActivity extends Activity{private ViewPager viewPager;    private ArrayList<View> pageViews;    private ImageView imageView;    private ImageView[] imageViews;   // 包裹滑动图片LinearLayout  private ViewGroup main;  // 包裹小圆点的LinearLayout  private ViewGroup group;  //左箭头按钮  private ImageView imageViewLeft;  //右箭头按钮  private ImageView imageViewRight;  //当前页码  private int currentIndex;  //ImageView的alpha值     private int mAlpha = 0;  private boolean isHide; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//将要显示的图片放到ArrayList当中，存到适配器中  LayoutInflater inflater = getLayoutInflater();    pageViews = new ArrayList<View>();    pageViews.add(inflater.inflate(R.layout.guide_item1, null));  pageViews.add(inflater.inflate(R.layout.guide_item2, null));  pageViews.add(inflater.inflate(R.layout.guide_item3, null));pageViews.add(inflater.inflate(R.layout.guide_item4, null));//将图片存放到ImageView集合中imageViews = new ImageView[pageViews.size()];    main = (ViewGroup)inflater.inflate(R.layout.guide, null);    //获取存放底部导航点ViewGroup  group = (ViewGroup)main.findViewById(R.id.guide_point_ll);    viewPager = (ViewPager)main.findViewById(R.id.guide_viewpager);    imageViewLeft = (ImageView)main.findViewById(R.id.imageView1);  imageViewRight = (ImageView)main.findViewById(R.id.imageView2);  imageViewLeft.setAlpha(0);  imageViewRight.setAlpha(0);  //将小圆点放到imageView数组当中  for (int i = 0; i < pageViews.size(); i++) {    System.out.println("pageViews.size() = " + pageViews.size());imageView = new ImageView(GuideActivity.this);    imageView.setLayoutParams(new LayoutParams(20,20));    imageView.setPadding(20, 0, 20, 0);    imageViews[i] = imageView;    if (i == 0) {    //默认选中第一张图片  imageViews[i].setBackgroundResource(R.drawable.green_point);    } else {    imageViews[i].setBackgroundResource(R.drawable.gray_point);    }    group.addView(imageViews[i]);    }    setContentView(main);  viewPager.setAdapter(new GuidePageAdapter());    viewPager.setOnPageChangeListener(new GuidePageChangeListener());  imageViewLeft.setOnClickListener(new ButtonListener());  imageViewRight.setOnClickListener(new ButtonListener());  }  //左右切换屏幕的按钮监听器  class ButtonListener implements OnClickListener{  @Override  public void onClick(View v) {  // TODO Auto-generated method stub  int showNext=0;  if(v.getId() == R.id.imageView1) {  System.out.println("点击了向左的按钮");  if(currentIndex ==0 )  showNext = currentIndex;  else  showNext = currentIndex-1;  viewPager.setCurrentItem(showNext);  }  if(v.getId() == R.id.imageView2){  System.out.println("点击了向右的按钮");  if(currentIndex == imageViews.length)  showNext = currentIndex;  else  showNext = currentIndex+1;  viewPager.setCurrentItem(showNext);  }  System.out.println("当前页码："+showNext);  }  }  /** * 设置按钮渐显效果 */  private Handler mHandler = new Handler()  {  public void handleMessage(Message msg) {  if(msg.what==1 && mAlpha<255){             //通过设置不透明度设置按钮的渐显效果  mAlpha += 50;  if(mAlpha>255)  mAlpha=255;  imageViewLeft.setAlpha(mAlpha);  imageViewLeft.invalidate();  imageViewRight.setAlpha(mAlpha);  imageViewRight.invalidate();  if(!isHide && mAlpha<255)  mHandler.sendEmptyMessageDelayed(1, 100);  }else if(msg.what==0 && mAlpha>0){  mAlpha -= 3;  if(mAlpha<0)  mAlpha=0;  imageViewLeft.setAlpha(mAlpha);  imageViewLeft.invalidate();  imageViewRight.setAlpha(mAlpha);  imageViewRight.invalidate();  if(isHide && mAlpha>0)  mHandler.sendEmptyMessageDelayed(0, 2);  }              }  };  private void showImageButtonView(){  isHide = false;  mHandler.sendEmptyMessage(1);  }  private void hideImageButtonView(){  new Thread(){  public void run() {  try {  isHide = true;  mHandler.sendEmptyMessage(0);  } catch (Exception e) {  ;  }  }  }.start();  }  @Override  public boolean dispatchTouchEvent(MotionEvent ev) {  System.out.println("this is dispatch");  System.out.println("触碰屏幕");  switch (ev.getAction()) {  case MotionEvent.ACTION_MOVE:  case MotionEvent.ACTION_DOWN:  showImageButtonView();              break;  case MotionEvent.ACTION_UP:  hideImageButtonView();                  break;  }  return super.dispatchTouchEvent(ev);  }  // 指引页面数据适配器,实现适配器方法  class GuidePageAdapter extends PagerAdapter {    @Override    public int getCount() {    return pageViews.size();    }    @Override    public boolean isViewFromObject(View arg0, Object arg1) {    return arg0 == arg1;    }    @Override    public int getItemPosition(Object object) {    // TODO Auto-generated method stub    return super.getItemPosition(object);    }    @Override    public void destroyItem(View arg0, int arg1, Object arg2) {    // TODO Auto-generated method stub    ((ViewPager) arg0).removeView(pageViews.get(arg1));    }    @Override    public Object instantiateItem(View arg0, int arg1) {    // TODO Auto-generated method stub    ((ViewPager) arg0).addView(pageViews.get(arg1));    return pageViews.get(arg1);    }    @Override    public void restoreState(Parcelable arg0, ClassLoader arg1) {    // TODO Auto-generated method stub    }    @Override    public Parcelable saveState() {    // TODO Auto-generated method stub    return null;    }    @Override    public void startUpdate(View arg0) {    // TODO Auto-generated method stub    }    @Override    public void finishUpdate(View arg0) {    // TODO Auto-generated method stub    }    }   // 指引页面更改事件监听器,左右滑动图片时候，小圆点变换显示当前图片位置  class GuidePageChangeListener implements OnPageChangeListener {    @Override    public void onPageScrollStateChanged(int arg0) {    // TODO Auto-generated method stub    }    @Override    public void onPageScrolled(int arg0, float arg1, int arg2) {    // TODO Auto-generated method stub    }    @Override    public void onPageSelected(int arg0) {    currentIndex = arg0;  for (int i = 0; i < imageViews.length; i++) {    imageViews[arg0].setBackgroundResource(R.drawable.green_point);  if (arg0 != i) {    imageViews[i].setBackgroundResource(R.drawable.gray_point);    }    }  }    }
}

使用ViewPage来显示各个布局文件，在四个布局文件中分别放四张图片。

详情请看：http://blog.csdn.net/dawanganban/article/details/17305769

进入主界面后就是我们设置闹钟的界面了，实现如下：

package com.example.alarmtest;import java.util.Calendar;import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.app.Service;
import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TimePicker;
import android.widget.Toast;public class MainActivity extends Activity {Button button;AlarmManager alarmManager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button = (Button) findViewById(R.id.button1);//获取AlarmManager对象alarmManager = (AlarmManager) getSystemService(Service.ALARM_SERVICE);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {Calendar currentTime = Calendar.getInstance();//创建一个TimePickerDialog实例，并显示new TimePickerDialog(MainActivity.this, 0, new TimePickerDialog.OnTimeSetListener() {@Overridepublic void onTimeSet(TimePicker view, int hourOfDay, int minute) {//指定启动AlarmActivity组件Intent intent = new Intent(MainActivity.this, AlarmActivity.class);//创建PendingIntent对象/** PendingIntent与Intent的区别是PendingIntent处理即将发生的事情* 比如：在通知栏Notification中跳转页面，不是立即跳转* 通常通过  getActivity、getBroadcast、getService得到PendingIntent的实例* */PendingIntent pi = PendingIntent.getActivity(MainActivity.this, 0, intent, 0);Calendar c = Calendar.getInstance();c.setTimeInMillis(System.currentTimeMillis());c.set(Calendar.HOUR, hourOfDay);c.set(Calendar.MINUTE, minute);alarmManager.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi);Toast.makeText(MainActivity.this, "设置闹钟成功", Toast.LENGTH_SHORT).show();}}, currentTime.get(Calendar.HOUR_OF_DAY), currentTime.get(Calendar.MINUTE), false).show();}});}
}

上面使用了一个时间设置组件TimePickDialog来设置时间，设置完时间后使用AlarmManager的set方法设置闹钟，值得注意的是上面有一个PendingIntent，这个和Intent的区别是PendIntent表示即将发生的意图，常和AlarmManager与Notifycation同时使用。另外，AlarmManager.RTC_WAKEUP表示一个定时器且会发出警报。

闹钟到时间后启动AlarmActivity来播放音乐

package com.example.alarmtest;import android.app.Activity;
import android.app.AlertDialog;
import android.app.Notification;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.media.MediaPlayer;
import android.os.Bundle;public class AlarmActivity extends Activity{MediaPlayer alarmMusic;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//加载指定音乐，并为之创建MediaPlayer对象alarmMusic = MediaPlayer.create(this, R.raw.nswdy);alarmMusic.setLooping(true);//播放闹钟alarmMusic.start();//创建一个对话框new AlertDialog.Builder(AlarmActivity.this).setTitle("闹钟").setMessage("闹钟响了，快起床啦！").setPositiveButton("确定", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {//停止音乐alarmMusic.stop();AlarmActivity.this.finish();}}).show();}
}

最后的运行结果：

源代码下载：http://download.csdn.net/detail/lxq_xsyu/6963763