android 关于闹钟

以下是我发现的几点闹钟中重要的点，分享一下：

         （1）在闹钟中有AudioManager管理机制，这个机制可以申请和释放OnAudioFocusChangeListener监听。

还有mTelephonyManager对象，处理在闹钟响的时候，来电铃声的切换。

         （2）广播接收闹钟，通过广播启动AlarmKlaxon这个Service，隐式启动service：

public static final String ALARM_INTENT_EXTRA = "intent.extra.alarm";

 // Play the alarm alert and vibrate the device.
         Intent playAlarm = new Intent(Alarms.ALARM_ALERT_ACTION);
         playAlarm.putExtra(Alarms.ALARM_INTENT_EXTRA, alarm);
         context.startService(playAlarm);

   在mainfest中，AlarmKlaxon这个服务的定义如下：

 <service android:name="AlarmKlaxon"
                 android:description="@string/alarm_klaxon_service_desc"
                 >
             <intent-filter>
                 <action android:name="com.cn.daming.deskclock.ALARM_ALERT" />
             </intent-filter>
         </service>

这个service做的是允许别的Activity打断正在响铃的铃声，播放其他的铃声，例如，闹钟响的时候来电话了。

        （3）在listview中包含checkbox，这时候闹钟的处理时，activity实现一个OnItemClickListener的监听，点击每一项的监听。然后在checkbox单独拿出去写一个类，继承LinearLayout，重写setPressed（）这个方法，以实现“当点击checkbox的时候不触发parent的click事件”。关键代码如下：

 <span style="font-size:18px;"> @Override
     public void setPressed(boolean pressed) {
         // If the parent is pressed, do not set to pressed.
         if (pressed && ((View) getParent()).isPressed()) {
             return;
         }
         super.setPressed(pressed);
     }</span>

                                  

                      点击新建闹钟出现的界面                                           设置好时间弹出的toast。

                                  

下面我把我的主要入口类的代码贴出来：

DeskClockMainActivity.java

 <span style="font-size:18px;">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.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ContextMenu;
 import android.view.ContextMenu.ContextMenuInfo;
 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.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;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         //取自定义布局的LayoutInflater
         mFactory = LayoutInflater.from(this);
         //取getSharedPreferences中key==“AlarmClock”的值
         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);
         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) {

                 }
         });
     }

     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_desk_clock:
                 //modify by wangxianming in 2012-4-14
 //                startActivity(new Intent(this, DeskClock.class));
                 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 onDestroy() {
         super.onDestroy();
         ToastMaster.cancelToast();
         mCursor.close();
     }
 }</span>

也可以到我的csdn资源中下载:http://download.csdn.net/detail/wdaming1986/4226174

转载：http://blog.csdn.net/wdaming1986/article/details/7461043