Android菜鸟的成长笔记（25）——可爱的小闹钟

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;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.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(){
				@Override
				public 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; 

	@Override
	protected 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;
	@Override
	protected 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() {

			@Override
			public 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() {

							@Override
							public 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;
	@Override
	protected 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() {

				@Override
				public 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