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：
@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);
}
下面看看我的程序截图：
红色圈的图标为我的闹钟。 点击“玲闹钟”后的界面
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
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, );
//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() != ) {
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() != ) {
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 == -) {
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();
}
}