Android闹钟拓展版【安卓闹钟可换壁纸版】

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经过写上篇文章Android闹钟最终版【android源码闹钟解析】 .发现有一些留邮箱的，但凡留邮箱的，我就发源码过去了，不错，基本上收到邮箱的都留言感谢了，这样我的成就感就多一点，也能有更多留邮箱的。学习是一个相互的过程，就像师说中“问道有先后，术业有专攻，仅此而已！”，知识就是一层窗户纸，捅破了就没什么了,-------->个人浅薄的拙见，在这表达一下！

前段时间参加一个CMDN的讲座，讲的是Android主题，其中就有小米手机的UI工程师，董红光简单介绍了5中换肤的方法。所以就想简单练手一下，拿上个闹钟来换个背景试一试。好多应用都有更换自己应用壁纸的功能，例如熊猫看书就有这个功能，还有韩国的SKY手机，也可以更换mainmeun的背景，我也小试牛刀一下；

转载请标明出处：http://blog.csdn.net/wdaming1986/article/details/7479359

在做这个更换背景的大致思路如下：

（1）用ImageSwitcher来切换图片，效果就和更换手机系统的壁纸类似，下面有个gallery，滚动gallery，当gallery，选中哪个的时候，就用ImageSwitcher来切换与之对应的大的图片。

（2）SetBackGround extends Activity implements AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory, OnClickListener。重写与之对应的方法。

（3）利用android提供的映射机制，当选中那个图片的时候，找到对应的gen下的R.java对应的16进制的值。

（4）用SharedPreferences保存这个id的值，下次进入这个程序，就可以取出来用了。就能永久保存了。

遇到的问题如下：

（1）在DeskClockMainActivity.java中用startActivityForResult（intent， request）；这个方法来启动SetBackGround.java这个类，当点击设置后，finish（）这个SetBackGround类，传递给DeskClockMainActivity的onActivityResult（）方法一个int的值。问题：startActivityForResult启动的时候，当SetBackGround这个类finish（）的时候，onActivityResult（）方法接受到的intent为空，resultCode==cancel，我就查资料，原来是DeskClockMainActivity的launcherMode=“singleInstance”导致的，它会启动一个新的栈，导致返回的时候不在一个栈中，传递intent传递不过去，我猜测是不同栈，intent回传的时候android有问题。修改方法，launcherMode=“singleTask”就可以了。详细参见api的startActivityForResult（）介绍；

（2）SetBackGround设置背景的类有个button，当声明一个button类型的时候，像常规那样写：

button = (Button) findViewById(R.id.setButton_bg);这时候报错，说类型不匹配。解决办法有两种：1、把button声明为view类的对象，这样再像常规那样找id就不报错了。2、让类实现一个OnClickListener监听，通过：findViewById(R.id.setButton_bg).setOnClickListener(this);这样写就ok了，实现onClick(View v) 的点击方法就ok了。

先看效果图，如下：

点击图中画红圈的图片，进入换背景界面；点击menu--->点击---->设置背景，

进入到更换背景的界面：点击设置背景，即背景设成功

下面把主要的类贴出来，供大家参考：

一、DeskClockMainActivity.java类中的代码，这个是程序的入口类：

package com.cn.daming.deskclock;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.graphics.Typeface;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.CheckBox;
import android.widget.CursorAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class DeskClockMainActivity extends Activity implements OnItemClickListener{
	
    static final String PREFERENCES = "AlarmClock";

    /** This must be false for production.  If true, turns on logging,
        test code, etc. */
    static final boolean DEBUG = false;

    private SharedPreferences mPrefs;
    private LayoutInflater mFactory;
    private ListView mAlarmsList;
    private Cursor mCursor;
    private LinearLayout mBglinearlayout;
    private static final int REQ_SET_BG = 100;
    private static final String SETBACKGROUND = "deskclock_bground";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        //取自定义布局的LayoutInflater
        mFactory = LayoutInflater.from(this);
        //取getSharedPreferences的实例
        mPrefs = getSharedPreferences(PREFERENCES, 0);
        //获取闹钟的cursor
        mCursor = Alarms.getAlarmsCursor(getContentResolver());
        
        //更新布局界面
        updateLayout();

    }
    
	//加载更新界面布局
    private void updateLayout() {
    	setContentView(R.layout.alarm_clock);
    	mBglinearlayout = (LinearLayout) findViewById(R.id.base_layout);
        mAlarmsList = (ListView) findViewById(R.id.alarms_list);
        AlarmTimeAdapter adapter = new AlarmTimeAdapter(this, mCursor);
        mAlarmsList.setAdapter(adapter);
        mAlarmsList.setVerticalScrollBarEnabled(true);
        mAlarmsList.setOnItemClickListener(this);
        mAlarmsList.setOnCreateContextMenuListener(this);

        View addAlarm = findViewById(R.id.add_alarm);
        addAlarm.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    addNewAlarm();
                }
            });
        // Make the entire view selected when focused.
        addAlarm.setOnFocusChangeListener(new View.OnFocusChangeListener() {
                public void onFocusChange(View v, boolean hasFocus) {
                    v.setSelected(hasFocus);
                }
        });

        ImageButton deskClock =
                (ImageButton) findViewById(R.id.desk_clock_button);
        deskClock.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                	/**
                	 * modify by wangxianming in 2012-4-17
                	 * enter the set background class SetBackGround
                	 * author:wangxianming
                	 */
                	Intent intent = new Intent();
                	intent.setClass(DeskClockMainActivity.this, SetBackGround.class);
                	startActivityForResult(intent, REQ_SET_BG);
                }
        });
    }
    
    @Override
	protected void onResume() {
    	SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    	int setBgId = sharedPreferences.getInt(SETBACKGROUND, 0);
    	Log.v("wangxianming", "DeskClockMainActivity onResume() setBgId == "+setBgId);
    	if(setBgId != 0){
    		//设置背景 add by wangxianming in 2012-04-17
    		mBglinearlayout.setBackgroundResource(setBgId);
    	}
		super.onResume();
	}
    
    private void addNewAlarm() {
        startActivity(new Intent(this, SetAlarm.class));
    }
    
    /**
     * listview的适配器继承CursorAdapter
     * @author wangxianming
     * 也可以使用BaseAdapter
     */
    private class AlarmTimeAdapter extends CursorAdapter {
        public AlarmTimeAdapter(Context context, Cursor cursor) {
            super(context, cursor);
        }

        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            View ret = mFactory.inflate(R.layout.alarm_time, parent, false);

            DigitalClock digitalClock =
                    (DigitalClock) ret.findViewById(R.id.digitalClock);
            digitalClock.setLive(false);
            return ret;
        }

        //把view绑定cursor的每一项
        public void bindView(View view, Context context, Cursor cursor) {
            final Alarm alarm = new Alarm(cursor);

            View indicator = view.findViewById(R.id.indicator);

            // Set the initial resource for the bar image.
            final ImageView barOnOff =
                    (ImageView) indicator.findViewById(R.id.bar_onoff);
            barOnOff.setImageResource(alarm.enabled ?
                    R.drawable.ic_indicator_on : R.drawable.ic_indicator_off);

            // Set the initial state of the clock "checkbox"
            final CheckBox clockOnOff =
                    (CheckBox) indicator.findViewById(R.id.clock_onoff);
            clockOnOff.setChecked(alarm.enabled);

            // Clicking outside the "checkbox" should also change the state.
            //对checkbox设置监听，使里外一致
            indicator.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        clockOnOff.toggle();
                        updateIndicatorAndAlarm(clockOnOff.isChecked(),
                                barOnOff, alarm);
                    }
            });

            DigitalClock digitalClock =
                    (DigitalClock) view.findViewById(R.id.digitalClock);

            // set the alarm text
            final Calendar c = Calendar.getInstance();
            c.set(Calendar.HOUR_OF_DAY, alarm.hour);
            c.set(Calendar.MINUTE, alarm.minutes);
            digitalClock.updateTime(c);
            digitalClock.setTypeface(Typeface.DEFAULT);

            // Set the repeat text or leave it blank if it does not repeat.
            TextView daysOfWeekView =
                    (TextView) digitalClock.findViewById(R.id.daysOfWeek);
            final String daysOfWeekStr =
                    alarm.daysOfWeek.toString(DeskClockMainActivity.this, false);
            if (daysOfWeekStr != null && daysOfWeekStr.length() != 0) {
                daysOfWeekView.setText(daysOfWeekStr);
                daysOfWeekView.setVisibility(View.VISIBLE);
            } else {
                daysOfWeekView.setVisibility(View.GONE);
            }

            // Display the label
            TextView labelView =
                    (TextView) view.findViewById(R.id.label);
            if (alarm.label != null && alarm.label.length() != 0) {
                labelView.setText(alarm.label);
                labelView.setVisibility(View.VISIBLE);
            } else {
                labelView.setVisibility(View.GONE);
            }
        }
    };
    
    //更新checkbox
    private void updateIndicatorAndAlarm(boolean enabled, ImageView bar,
            Alarm alarm) {
        bar.setImageResource(enabled ? R.drawable.ic_indicator_on
                : R.drawable.ic_indicator_off);
        Alarms.enableAlarm(this, alarm.id, enabled);
        if (enabled) {
            SetAlarm.popAlarmSetToast(this, alarm.hour, alarm.minutes,
                    alarm.daysOfWeek);
        }
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Activity#onContextItemSelected(android.view.MenuItem)
     * 创建上下文菜单
     */
    @Override
    public boolean onContextItemSelected(final MenuItem item) {
        final AdapterContextMenuInfo info =
                (AdapterContextMenuInfo) item.getMenuInfo();
        final int id = (int) info.id;
        // Error check just in case.
        if (id == -1) {
            return super.onContextItemSelected(item);
        }
        switch (item.getItemId()) {
            case R.id.delete_alarm:
                // Confirm that the alarm will be deleted.
                new AlertDialog.Builder(this)
                        .setTitle(getString(R.string.delete_alarm))
                        .setMessage(getString(R.string.delete_alarm_confirm))
                        .setPositiveButton(android.R.string.ok,
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface d,
                                            int w) {
                                        Alarms.deleteAlarm(DeskClockMainActivity.this, id);
                                    }
                                })
                        .setNegativeButton(android.R.string.cancel, null)
                        .show();
                return true;

            case R.id.enable_alarm:
                final Cursor c = (Cursor) mAlarmsList.getAdapter()
                        .getItem(info.position);
                final Alarm alarm = new Alarm(c);
                Alarms.enableAlarm(this, alarm.id, !alarm.enabled);
                if (!alarm.enabled) {
                    SetAlarm.popAlarmSetToast(this, alarm.hour, alarm.minutes,
                            alarm.daysOfWeek);
                }
                return true;

            case R.id.edit_alarm:
                Intent intent = new Intent(this, SetAlarm.class);
                intent.putExtra(Alarms.ALARM_ID, id);
                startActivity(intent);
                return true;

            default:
                break;
        }
        return super.onContextItemSelected(item);
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Activity#onCreateContextMenu(android.view.ContextMenu, android.view.View, android.view.ContextMenu.ContextMenuInfo)
     * 创建菜单
     */
    @Override
    public void onCreateContextMenu(ContextMenu menu, View view,
            ContextMenuInfo menuInfo) {
        // Inflate the menu from xml.
        getMenuInflater().inflate(R.menu.context_menu, menu);

        // Use the current item to create a custom view for the header.
        final AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
        final Cursor c =
                (Cursor) mAlarmsList.getAdapter().getItem((int) info.position);
        final Alarm alarm = new Alarm(c);

        // Construct the Calendar to compute the time.
        final Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, alarm.hour);
        cal.set(Calendar.MINUTE, alarm.minutes);
        final String time = Alarms.formatTime(this, cal);

        // Inflate the custom view and set each TextView's text.
        final View v = mFactory.inflate(R.layout.context_menu_header, null);
        TextView textView = (TextView) v.findViewById(R.id.header_time);
        textView.setText(time);
        textView = (TextView) v.findViewById(R.id.header_label);
        textView.setText(alarm.label);

        // Set the custom view on the menu.
        menu.setHeaderView(v);
        // Change the text based on the state of the alarm.
        if (alarm.enabled) {
            menu.findItem(R.id.enable_alarm).setTitle(R.string.disable_alarm);
        }
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)
     * 设置菜单的点击事件的处理
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_item_settings:
                startActivity(new Intent(this, SettingsActivity.class));
                return true;
            case R.id.menu_item_alarm_set_bg:
            	/**
            	 * modify by wangxianming in 2012-4-17
            	 * enter the set background class SetBackGround
            	 * author:wangxianming
            	 */
                startActivityForResult((new Intent(this, SetBackGround.class)), REQ_SET_BG);
                return true;
            case R.id.menu_item_add_alarm:
                addNewAlarm();
                return true;
            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }
    
	/*
     * (non-Javadoc)
     * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)
     * 创建菜单
     */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.alarm_list_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }
    
    /*
     * (non-Javadoc)
     * @see android.widget.AdapterView.OnItemClickListener#onItemClick(android.widget.AdapterView, android.view.View, int, long)
     * 创建菜单的点击事件响应
     */
	public void onItemClick(AdapterView<?> adapterView, View v, int pos, long id) {
		Intent intent = new Intent(this, SetAlarm.class);
        intent.putExtra(Alarms.ALARM_ID, (int) id);
        startActivity(intent);
		
	}
	
   @Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	   SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
	   SharedPreferences.Editor editor = sharedPreferences.edit();
	   if(resultCode != RESULT_OK) {
		   return;
	   }
	   if(requestCode == REQ_SET_BG) {
		   switch(resultCode) {
		         case RESULT_OK:
		        	 Bundle b = data.getExtras();
		        	 int id = b.getInt("getDrawable");
		        	 editor.putInt(SETBACKGROUND, id);
		        	 editor.commit();
		        	 if(0 != id) {
		        		 //设置背景
		        		 mBglinearlayout.setBackgroundResource(id);
		        	 }
		        	 Log.v("wangxianming", "DeskClockMainActivity onActivityResult()----> id == "+id);
		        	 break;
		         default:
		        	 break;
		   }
	   }
		super.onActivityResult(requestCode, resultCode, data);
	}

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ToastMaster.cancelToast();
        mCursor.close();
    }
}

二、SetBackGround.java类中的代码，这个是设置背景图片的类：

package com.cn.daming.deskclock;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.graphics.Typeface;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.CheckBox;
import android.widget.CursorAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class DeskClockMainActivity extends Activity implements OnItemClickListener{
	
    static final String PREFERENCES = "AlarmClock";

    /** This must be false for production.  If true, turns on logging,
        test code, etc. */
    static final boolean DEBUG = false;

    private SharedPreferences mPrefs;
    private LayoutInflater mFactory;
    private ListView mAlarmsList;
    private Cursor mCursor;
    private LinearLayout mBglinearlayout;
    private static final int REQ_SET_BG = 100;
    private static final String SETBACKGROUND = "deskclock_bground";
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        //取自定义布局的LayoutInflater
        mFactory = LayoutInflater.from(this);
        //取getSharedPreferences的实例
        mPrefs = getSharedPreferences(PREFERENCES, 0);
        //获取闹钟的cursor
        mCursor = Alarms.getAlarmsCursor(getContentResolver());
        
        //更新布局界面
        updateLayout();

    }
    
	//加载更新界面布局
    private void updateLayout() {
    	setContentView(R.layout.alarm_clock);
    	mBglinearlayout = (LinearLayout) findViewById(R.id.base_layout);
        mAlarmsList = (ListView) findViewById(R.id.alarms_list);
        AlarmTimeAdapter adapter = new AlarmTimeAdapter(this, mCursor);
        mAlarmsList.setAdapter(adapter);
        mAlarmsList.setVerticalScrollBarEnabled(true);
        mAlarmsList.setOnItemClickListener(this);
        mAlarmsList.setOnCreateContextMenuListener(this);

        View addAlarm = findViewById(R.id.add_alarm);
        addAlarm.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    addNewAlarm();
                }
            });
        // Make the entire view selected when focused.
        addAlarm.setOnFocusChangeListener(new View.OnFocusChangeListener() {
                public void onFocusChange(View v, boolean hasFocus) {
                    v.setSelected(hasFocus);
                }
        });

        ImageButton deskClock =
                (ImageButton) findViewById(R.id.desk_clock_button);
        deskClock.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                	/**
                	 * modify by wangxianming in 2012-4-17
                	 * enter the set background class SetBackGround
                	 * author:wangxianming
                	 */
                	Intent intent = new Intent();
                	intent.setClass(DeskClockMainActivity.this, SetBackGround.class);
                	startActivityForResult(intent, REQ_SET_BG);
                }
        });
    }
    
    @Override
	protected void onResume() {
    	SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    	int setBgId = sharedPreferences.getInt(SETBACKGROUND, 0);
    	Log.v("wangxianming", "DeskClockMainActivity onResume() setBgId == "+setBgId);
    	if(setBgId != 0){
    		//设置背景 add by wangxianming in 2012-04-17
    		mBglinearlayout.setBackgroundResource(setBgId);
    	}
		super.onResume();
	}
    
    private void addNewAlarm() {
        startActivity(new Intent(this, SetAlarm.class));
    }
    
    /**
     * listview的适配器继承CursorAdapter
     * @author wangxianming
     * 也可以使用BaseAdapter
     */
    private class AlarmTimeAdapter extends CursorAdapter {
        public AlarmTimeAdapter(Context context, Cursor cursor) {
            super(context, cursor);
        }

        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            View ret = mFactory.inflate(R.layout.alarm_time, parent, false);

            DigitalClock digitalClock =
                    (DigitalClock) ret.findViewById(R.id.digitalClock);
            digitalClock.setLive(false);
            return ret;
        }

        //把view绑定cursor的每一项
        public void bindView(View view, Context context, Cursor cursor) {
            final Alarm alarm = new Alarm(cursor);

            View indicator = view.findViewById(R.id.indicator);

            // Set the initial resource for the bar image.
            final ImageView barOnOff =
                    (ImageView) indicator.findViewById(R.id.bar_onoff);
            barOnOff.setImageResource(alarm.enabled ?
                    R.drawable.ic_indicator_on : R.drawable.ic_indicator_off);

            // Set the initial state of the clock "checkbox"
            final CheckBox clockOnOff =
                    (CheckBox) indicator.findViewById(R.id.clock_onoff);
            clockOnOff.setChecked(alarm.enabled);

            // Clicking outside the "checkbox" should also change the state.
            //对checkbox设置监听，使里外一致
            indicator.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        clockOnOff.toggle();
                        updateIndicatorAndAlarm(clockOnOff.isChecked(),
                                barOnOff, alarm);
                    }
            });

            DigitalClock digitalClock =
                    (DigitalClock) view.findViewById(R.id.digitalClock);

            // set the alarm text
            final Calendar c = Calendar.getInstance();
            c.set(Calendar.HOUR_OF_DAY, alarm.hour);
            c.set(Calendar.MINUTE, alarm.minutes);
            digitalClock.updateTime(c);
            digitalClock.setTypeface(Typeface.DEFAULT);

            // Set the repeat text or leave it blank if it does not repeat.
            TextView daysOfWeekView =
                    (TextView) digitalClock.findViewById(R.id.daysOfWeek);
            final String daysOfWeekStr =
                    alarm.daysOfWeek.toString(DeskClockMainActivity.this, false);
            if (daysOfWeekStr != null && daysOfWeekStr.length() != 0) {
                daysOfWeekView.setText(daysOfWeekStr);
                daysOfWeekView.setVisibility(View.VISIBLE);
            } else {
                daysOfWeekView.setVisibility(View.GONE);
            }

            // Display the label
            TextView labelView =
                    (TextView) view.findViewById(R.id.label);
            if (alarm.label != null && alarm.label.length() != 0) {
                labelView.setText(alarm.label);
                labelView.setVisibility(View.VISIBLE);
            } else {
                labelView.setVisibility(View.GONE);
            }
        }
    };
    
    //更新checkbox
    private void updateIndicatorAndAlarm(boolean enabled, ImageView bar,
            Alarm alarm) {
        bar.setImageResource(enabled ? R.drawable.ic_indicator_on
                : R.drawable.ic_indicator_off);
        Alarms.enableAlarm(this, alarm.id, enabled);
        if (enabled) {
            SetAlarm.popAlarmSetToast(this, alarm.hour, alarm.minutes,
                    alarm.daysOfWeek);
        }
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Activity#onContextItemSelected(android.view.MenuItem)
     * 创建上下文菜单
     */
    @Override
    public boolean onContextItemSelected(final MenuItem item) {
        final AdapterContextMenuInfo info =
                (AdapterContextMenuInfo) item.getMenuInfo();
        final int id = (int) info.id;
        // Error check just in case.
        if (id == -1) {
            return super.onContextItemSelected(item);
        }
        switch (item.getItemId()) {
            case R.id.delete_alarm:
                // Confirm that the alarm will be deleted.
                new AlertDialog.Builder(this)
                        .setTitle(getString(R.string.delete_alarm))
                        .setMessage(getString(R.string.delete_alarm_confirm))
                        .setPositiveButton(android.R.string.ok,
                                new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface d,
                                            int w) {
                                        Alarms.deleteAlarm(DeskClockMainActivity.this, id);
                                    }
                                })
                        .setNegativeButton(android.R.string.cancel, null)
                        .show();
                return true;

            case R.id.enable_alarm:
                final Cursor c = (Cursor) mAlarmsList.getAdapter()
                        .getItem(info.position);
                final Alarm alarm = new Alarm(c);
                Alarms.enableAlarm(this, alarm.id, !alarm.enabled);
                if (!alarm.enabled) {
                    SetAlarm.popAlarmSetToast(this, alarm.hour, alarm.minutes,
                            alarm.daysOfWeek);
                }
                return true;

            case R.id.edit_alarm:
                Intent intent = new Intent(this, SetAlarm.class);
                intent.putExtra(Alarms.ALARM_ID, id);
                startActivity(intent);
                return true;

            default:
                break;
        }
        return super.onContextItemSelected(item);
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Activity#onCreateContextMenu(android.view.ContextMenu, android.view.View, android.view.ContextMenu.ContextMenuInfo)
     * 创建菜单
     */
    @Override
    public void onCreateContextMenu(ContextMenu menu, View view,
            ContextMenuInfo menuInfo) {
        // Inflate the menu from xml.
        getMenuInflater().inflate(R.menu.context_menu, menu);

        // Use the current item to create a custom view for the header.
        final AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
        final Cursor c =
                (Cursor) mAlarmsList.getAdapter().getItem((int) info.position);
        final Alarm alarm = new Alarm(c);

        // Construct the Calendar to compute the time.
        final Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, alarm.hour);
        cal.set(Calendar.MINUTE, alarm.minutes);
        final String time = Alarms.formatTime(this, cal);

        // Inflate the custom view and set each TextView's text.
        final View v = mFactory.inflate(R.layout.context_menu_header, null);
        TextView textView = (TextView) v.findViewById(R.id.header_time);
        textView.setText(time);
        textView = (TextView) v.findViewById(R.id.header_label);
        textView.setText(alarm.label);

        // Set the custom view on the menu.
        menu.setHeaderView(v);
        // Change the text based on the state of the alarm.
        if (alarm.enabled) {
            menu.findItem(R.id.enable_alarm).setTitle(R.string.disable_alarm);
        }
    }
    
    /*
     * (non-Javadoc)
     * @see android.app.Activity#onOptionsItemSelected(android.view.MenuItem)
     * 设置菜单的点击事件的处理
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_item_settings:
                startActivity(new Intent(this, SettingsActivity.class));
                return true;
            case R.id.menu_item_alarm_set_bg:
            	/**
            	 * modify by wangxianming in 2012-4-17
            	 * enter the set background class SetBackGround
            	 * author:wangxianming
            	 */
                startActivityForResult((new Intent(this, SetBackGround.class)), REQ_SET_BG);
                return true;
            case R.id.menu_item_add_alarm:
                addNewAlarm();
                return true;
            default:
                break;
        }
        return super.onOptionsItemSelected(item);
    }
    
	/*
     * (non-Javadoc)
     * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)
     * 创建菜单
     */
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.alarm_list_menu, menu);
        return super.onCreateOptionsMenu(menu);
    }
    
    /*
     * (non-Javadoc)
     * @see android.widget.AdapterView.OnItemClickListener#onItemClick(android.widget.AdapterView, android.view.View, int, long)
     * 创建菜单的点击事件响应
     */
	public void onItemClick(AdapterView<?> adapterView, View v, int pos, long id) {
		Intent intent = new Intent(this, SetAlarm.class);
        intent.putExtra(Alarms.ALARM_ID, (int) id);
        startActivity(intent);
		
	}
	
   @Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
	   SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
	   SharedPreferences.Editor editor = sharedPreferences.edit();
	   if(resultCode != RESULT_OK) {
		   return;
	   }
	   if(requestCode == REQ_SET_BG) {
		   switch(resultCode) {
		         case RESULT_OK:
		        	 Bundle b = data.getExtras();
		        	 int id = b.getInt("getDrawable");
		        	 editor.putInt(SETBACKGROUND, id);
		        	 editor.commit();
		        	 if(0 != id) {
		        		 //设置背景
		        		 mBglinearlayout.setBackgroundResource(id);
		        	 }
		        	 Log.v("wangxianming", "DeskClockMainActivity onActivityResult()----> id == "+id);
		        	 break;
		         default:
		        	 break;
		   }
	   }
		super.onActivityResult(requestCode, resultCode, data);
	}

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ToastMaster.cancelToast();
        mCursor.close();
    }
}

【说明】有Android闹钟最终版【android源码闹钟解析】代码的，可以参照我的代码修改一下；

当然如果没有代码的：

（一）想要源码的可以留下邮箱，我看到后就给你发过去！

（二）也可以到我的csdn资源中下载:http://download.csdn.net/detail/wdaming1986/4240708

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