android 闹钟设置
16lz
2021-01-25
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:
- packagecom.yarin.android.Examples_07_07;
- importandroid.content.BroadcastReceiver;
- importandroid.content.Context;
- importandroid.content.Intent;
- importandroid.widget.Toast;
- publicclassAlarmReceiverextendsBroadcastReceiver{
- publicvoidonReceive(Contextcontext,Intentintent){
- Toast.makeText(context,"你设置的闹钟时间到了",Toast.LENGTH_LONG).show();
- }
- }
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
- <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
- packagecom.yarin.android.Examples_07_07;
- importjava.util.Calendar;
- importandroid.app.Activity;
- importandroid.app.AlarmManager;
- importandroid.app.PendingIntent;
- importandroid.app.TimePickerDialog;
- importandroid.content.Intent;
- importandroid.os.Bundle;
- importandroid.view.View;
- importandroid.widget.Button;
- importandroid.widget.TextView;
- importandroid.widget.TimePicker;
- publicclassActivity01extendsActivity{
- ButtonmButton1;
- ButtonmButton2;
- TextViewmTextView;
- Calendarcalendar;
- /**Calledwhentheactivityisfirstcreated.*/
- @Override
- publicvoidonCreate(BundlesavedInstanceState){
- 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(newView.OnClickListener(){
- publicvoidonClick(Viewv){
- calendar.setTimeInMillis(System.currentTimeMillis());
- intmHour=calendar.get(Calendar.HOUR_OF_DAY);
- intmMinute=calendar.get(Calendar.MINUTE);
- newTimePickerDialog(Activity01.this,
- newTimePickerDialog.OnTimeSetListener(){
- publicvoidonTimeSet(TimePickerview,
- inthourOfDay,intminute){
- 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*/
- Intentintent=newIntent(Activity01.this,
- AlarmReceiver.class);
- PendingIntentpendingIntent=PendingIntent
- .getBroadcast(Activity01.this,0,
- intent,0);
- AlarmManageram;
- /*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);
- StringtmpS="设置闹钟时间为"+format(hourOfDay)
- +":"+format(minute);
- mTextView.setText(tmpS);
- }
- },mHour,mMinute,true).show();
- }
- });
- mButton2.setOnClickListener(newView.OnClickListener(){
- publicvoidonClick(Viewv){
- Intentintent=newIntent(Activity01.this,AlarmReceiver.class);
- PendingIntentpendingIntent=PendingIntent.getBroadcast(
- Activity01.this,0,intent,0);
- AlarmManageram;
- /*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)*/
- privateStringformat(intx){
- Strings=""+x;
- if(s.length()==1)
- s="0"+s;
- returns;
- }
- }
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. */@Overridepublic 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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