android 闹钟设置

时间  2021-01-20 

写代码挺费时间的，懒得写，我就说说思路，你建一个类继承子BroadcastReceiver,复写onReceive方法，在里面写监听系统时间的代码用于跟你闹钟设置时间进行匹配，当匹配上时，创建MediaPlayer对象，播放你要播放的音乐，音乐文件可以放在Res/raw目录下，也可是在SD卡中，使用不同的方法即可。设闹钟的Activity找找例子，写出来应该不难。

在Android中可以通过AlarmManager 来实现闹钟，AlarmManager类是专门用来设定在某个指定的时间去完成指定的事件。AlarmManager 提供了访问系统警报的服务，只要在程序中设置了警报服务，AlarmManager 就会通过onReceive()方法去执行这些事件，就算系统处于待机状态，同样不会影响运行。可以通过 Context.getSystemService 方法来获得该服务。 AlarmManager 中的方法很少。如下所示

AlarmManager 的方法
方法 说明
cancel 取消AlarmManager服务
set 设置AlarmManager服务
setInexactRepeating 设置不精确周期
setRepeating 设置精确周期
setTimeZone 设置时区

要实现闹钟，首先需要创建一个继承自 BroadcastReceiver 的类，实现 onReceive 方法来接收这个Alarm服务，然后通过建立Intent 和 PendingIntent连接来调用 Alarm组件。当我们点击“设置闹钟”按钮时，通过 TimePickerDialog 来设置时间，当时间到我们指定的时间后onReceive 方法接收Alarm服务 运行效果见下图


设置闹钟时间


时间到后的Toast提示

首先看看我们实现的接收 Alarm 服务的 AlarmReceiver类，很简单，就是在收到消息后用一个 Toast 来提示用户，代码如下：

Java代码 复制代码 收藏代码
  1. packagecom.yarin.android.Examples_07_07;
  3. importandroid.content.BroadcastReceiver;
  4. importandroid.content.Context;
  5. importandroid.content.Intent;
  6. importandroid.widget.Toast;
  8. publicclassAlarmReceiverextendsBroadcastReceiver{
  9. publicvoidonReceive(Contextcontext,Intentintent){
  10. Toast.makeText(context,"你设置的闹钟时间到了",Toast.LENGTH_LONG).show();
  11. }
  12. }
package com.yarin.android.Examples_07_07; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.widget.Toast; public class AlarmReceiver extends BroadcastReceiver { public void onReceive(Context context, Intent intent) { Toast.makeText(context, "你设置的闹钟时间到了", Toast.LENGTH_LONG).show(); } }

由于使用了 BroadcastReceiver 服务，因此需要在 AndroidManifest.xml中进行声明，代码如下：
Xml代码 复制代码 收藏代码
  1. <receiverandroid:name=".AlarmReceiver"android:process=":remote"/>
<receiver android:name=".AlarmReceiver" android:process=":remote" />

然后就只需要对"设置闹钟"、"取消闹钟" 的事件进行监听了，代码如下：
Java代码 复制代码 收藏代码
  1. packagecom.yarin.android.Examples_07_07;
  3. importjava.util.Calendar;
  5. importandroid.app.Activity;
  6. importandroid.app.AlarmManager;
  7. importandroid.app.PendingIntent;
  8. importandroid.app.TimePickerDialog;
  9. importandroid.content.Intent;
  10. importandroid.os.Bundle;
  11. importandroid.view.View;
  12. importandroid.widget.Button;
  13. importandroid.widget.TextView;
  14. importandroid.widget.TimePicker;
  16. publicclassActivity01extendsActivity{
  17. ButtonmButton1;
  18. ButtonmButton2;
  20. TextViewmTextView;
  22. Calendarcalendar;
  24. /**Calledwhentheactivityisfirstcreated.*/
  25. @Override
  26. publicvoidonCreate(BundlesavedInstanceState){
  27. super.onCreate(savedInstanceState);
  29. setContentView(R.layout.main);
  30. calendar=Calendar.getInstance();
  32. mTextView=(TextView)findViewById(R.id.TextView01);
  33. mButton1=(Button)findViewById(R.id.Button01);
  34. mButton2=(Button)findViewById(R.id.Button02);
  36. mButton1.setOnClickListener(newView.OnClickListener(){
  37. publicvoidonClick(Viewv){
  38. calendar.setTimeInMillis(System.currentTimeMillis());
  39. intmHour=calendar.get(Calendar.HOUR_OF_DAY);
  40. intmMinute=calendar.get(Calendar.MINUTE);
  41. newTimePickerDialog(Activity01.this,
  42. newTimePickerDialog.OnTimeSetListener(){
  43. publicvoidonTimeSet(TimePickerview,
  44. inthourOfDay,intminute){
  45. calendar.setTimeInMillis(System
  46. .currentTimeMillis());
  47. calendar.set(Calendar.HOUR_OF_DAY,hourOfDay);
  48. calendar.set(Calendar.MINUTE,minute);
  49. calendar.set(Calendar.SECOND,0);
  50. calendar.set(Calendar.MILLISECOND,0);
  51. /*建立Intent和PendingIntent，来调用目标组件*/
  52. Intentintent=newIntent(Activity01.this,
  53. AlarmReceiver.class);
  54. PendingIntentpendingIntent=PendingIntent
  55. .getBroadcast(Activity01.this,0,
  56. intent,0);
  57. AlarmManageram;
  58. /*获取闹钟管理的实例*/
  59. am=(AlarmManager)getSystemService(ALARM_SERVICE);
  60. /*设置闹钟*/
  61. am.set(AlarmManager.RTC_WAKEUP,calendar
  62. .getTimeInMillis(),pendingIntent);
  63. /*设置周期闹*/
  64. am.setRepeating(AlarmManager.RTC_WAKEUP,System
  65. .currentTimeMillis()
  66. +(10*1000),(24*60*60*1000),
  67. pendingIntent);
  68. StringtmpS="设置闹钟时间为"+format(hourOfDay)
  69. +":"+format(minute);
  70. mTextView.setText(tmpS);
  71. }
  72. },mHour,mMinute,true).show();
  73. }
  74. });
  76. mButton2.setOnClickListener(newView.OnClickListener(){
  77. publicvoidonClick(Viewv){
  78. Intentintent=newIntent(Activity01.this,AlarmReceiver.class);
  79. PendingIntentpendingIntent=PendingIntent.getBroadcast(
  80. Activity01.this,0,intent,0);
  81. AlarmManageram;
  82. /*获取闹钟管理的实例*/
  83. am=(AlarmManager)getSystemService(ALARM_SERVICE);
  84. /*取消*/
  85. am.cancel(pendingIntent);
  86. mTextView.setText("闹钟已取消！");
  87. }
  88. });
  89. }
  91. /*格式化字符串(7:3->07:03)*/
  92. privateStringformat(intx){
  93. Strings=""+x;
  94. if(s.length()==1)
  95. s="0"+s;
  96. returns;
  97. }
  98. }
package com.yarin.android.Examples_07_07; import java.util.Calendar; import android.app.Activity; import android.app.AlarmManager; import android.app.PendingIntent; import android.app.TimePickerDialog; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.TimePicker; public class Activity01 extends Activity { Button mButton1; Button mButton2; TextView mTextView; Calendar calendar; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); calendar = Calendar.getInstance(); mTextView = (TextView) findViewById(R.id.TextView01); mButton1 = (Button) findViewById(R.id.Button01); mButton2 = (Button) findViewById(R.id.Button02); mButton1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { calendar.setTimeInMillis(System.currentTimeMillis()); int mHour = calendar.get(Calendar.HOUR_OF_DAY); int mMinute = calendar.get(Calendar.MINUTE); new TimePickerDialog(Activity01.this, new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view, int hourOfDay, int minute) { calendar.setTimeInMillis(System .currentTimeMillis()); calendar.set(Calendar.HOUR_OF_DAY, hourOfDay); calendar.set(Calendar.MINUTE, minute); calendar.set(Calendar.SECOND, 0); calendar.set(Calendar.MILLISECOND, 0); /* 建立Intent和PendingIntent，来调用目标组件 */ Intent intent = new Intent(Activity01.this, AlarmReceiver.class); PendingIntent pendingIntent = PendingIntent .getBroadcast(Activity01.this, 0, intent, 0); AlarmManager am; /* 获取闹钟管理的实例 */ am = (AlarmManager) getSystemService(ALARM_SERVICE); /* 设置闹钟 */ am.set(AlarmManager.RTC_WAKEUP, calendar .getTimeInMillis(), pendingIntent); /* 设置周期闹 */ am.setRepeating(AlarmManager.RTC_WAKEUP, System .currentTimeMillis() + (10 * 1000), (24 * 60 * 60 * 1000), pendingIntent); String tmpS = "设置闹钟时间为" + format(hourOfDay) + ":" + format(minute); mTextView.setText(tmpS); } }, mHour, mMinute, true).show(); } }); mButton2.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent intent = new Intent(Activity01.this, AlarmReceiver.class); PendingIntent pendingIntent = PendingIntent.getBroadcast( Activity01.this, 0, intent, 0); AlarmManager am; /* 获取闹钟管理的实例 */ am = (AlarmManager) getSystemService(ALARM_SERVICE); /* 取消 */ am.cancel(pendingIntent); mTextView.setText("闹钟已取消！"); } }); } /* 格式化字符串(7:3->07:03) */ private String format(int x) { String s = "" + x; if (s.length() == 1) s = "0" + s; return s; } }
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