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