Android--闹钟

今天我们来写一个闹铃的小demo。我们先通过下面图片了解一下实现的方法，（如下图）

首先要获取AlarmManager（闹钟管理者），然后获取当前系统时间。

具体步骤看代码：

1.布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context="com.example.smz.g150831_android28_alarm.MainActivity"> <Button android:layout_width="340dp" android:layout_height="wrap_content" android:text="设置闹钟(一次)" android:onClick="setAlarmOne" android:layout_gravity="center" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="设置闹钟(周期)" android:onClick="setAlarmCycle" android:layout_gravity="center" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="取消周期闹钟" android:onClick="cancelAlarmCycle" android:layout_gravity="center" /></LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
android:layout_width="match_parent" android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.smz.g150831_android28_alarm.MainActivity">
<Button
android:layout_width="340dp"
android:layout_height="wrap_content"
android:text="设置闹钟(一次)"
android:onClick="setAlarmOne"
android:layout_gravity="center"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="设置闹钟(周期)"
android:onClick="setAlarmCycle"
android:layout_gravity="center"
/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="取消周期闹钟"
android:onClick="cancelAlarmCycle"
android:layout_gravity="center"
/>
</LinearLayout>

2.MainActivity

public class MainActivity extends AppCompatActivity {    private AlarmManager alarmManager;    private PendingIntent pendingIntent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取闹钟管理者        alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);    }    public void setAlarmOne(View view){        //获取当前系统时间        Calendar calendar=Calendar.getInstance();        int hour=calendar.get(Calendar.HOUR_OF_DAY);        int minute=calendar.get(Calendar.MINUTE);        //1.弹出时间对话框        //2.确定好选择的时间        //3.设置闹钟        //4.当之间一到，将执行的响应        TimePickerDialog timePickerDialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {            @Override            public void onTimeSet(TimePicker timePicker, int i, int i1) {                Calendar c=Calendar.getInstance();                c.set(Calendar.HOUR_OF_DAY,i);                c.set(Calendar.MINUTE,i1);                Intent intent=new Intent();                intent.setAction("com.example.smz.g150831_android28_alarm.RING");                PendingIntent pendingIntent=PendingIntent.getBroadcast(MainActivity.this,0x101,intent,0);                alarmManager.set(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),pendingIntent);            }        },hour,minute,true);        timePickerDialog.show();    }    public void setAlarmCycle(View view){        //获取当前系统时间        Calendar calendar=Calendar.getInstance();        int hour=calendar.get(Calendar.HOUR_OF_DAY);        int minute=calendar.get(Calendar.MINUTE);        //01.弹出时间对话框        TimePickerDialog timePickerDialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener() {            @Override            public void onTimeSet(TimePicker timePicker, int i, int i1) {                Calendar c=Calendar.getInstance();                c.set(Calendar.HOUR_OF_DAY,i);                c.set(Calendar.MINUTE,i1);                //02.确定好选择的时间                //03.设置闹钟                //04.当之间一到，将执行的响应                Intent intent=new Intent();                intent.setAction("com.zking.g150831_android28_alarm_notification.RING");                pendingIntent = PendingIntent.getBroadcast(MainActivity.this,0x102,intent,0);                alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,c.getTimeInMillis(),5000, pendingIntent);            }        },hour,minute,true);        timePickerDialog.show();    }    public void cancelAlarmCycle(View view){            alarmManager.cancel(pendingIntent);    }}

这里我是用广播，跳转的.新建了个RingReceived.activity

public class RingReceived extends BroadcastReceiver{    @Override    public void onReceive(Context context, Intent intent) {        if ("com.example.smz.g150831_android28_alarm.RING".equals(intent.getAction())){            Log.i("test","收到广播了");            //跳转到RingActivity*(
(音乐是从应用直接拿的)
 Intent intent1=new Intent(context,RingActivity.class); //给Intent设置标志位Flag intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //Intent的组成部分：ComponementName extra Action Data Categlay(分组) Flag context.startActivity(intent1); } }}