在android开发中经常需要调用系统内置的功能来发送短信,或者读取短信内容(如:提取短信验证码)。android中要实现发短信功能,必须要用到android系统中发短信的权限,即在AndoridManifest.xml中添加发送短信权限。如下:
<uses-permission android:name=”android.permission.SEND_SMS” />
我们可以使用AlarmManager来实现一个倒计时的功能,当时间到时发送短信。AlarmManager有两个相似的用法:
在指定时常时候执行某项操作
周期性的执行某项操作
AlarmManager对象需要配合Intent对象使用,可以定时开启一个Activity,发送一个Broadcast,或者开启一个Service。以下是核心代码片段:
AlarmManager aManager = (AlarmManager) getSystemService( Context.ALARM_SERVICE ); Intent intent = new Intent(this, AlarmReceiver.class); intent.setAction( "AlarmReceiver" ); PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0); // aManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent); aManager.setRepeating(AlarmManager.RTC, 0, 60*1000, pendingIntent)
可以直接使用AlarmManager对象的set方法来设定具体的闹钟时间。
可以使用TImePicker的方式来设定时间,这种方式比较灵活。
1、现在AndroidMainfest.xml里添加Receiver的声明
<receiver android:name=".AlarmReceiver" android:label="@string/app_name"> <intent-filter> <action android:name="AlarmReceiver" /> </intent-filter> </receiver>
在AlarmReceiver.java中实现对时间的获取以及发送短信的功能。发送短信需要用到SmsManager类,利用类 SmsManager 发送信息, smsManager 为 SmsManager 一个默认的实例。
SmsManager smsManager = SmsManager.getDefault(); smsManager.sendTextMessage(destinationAddress, scAddress, text, sentIntent, deliveryIntent);
其中各个参数的含义如下
destinationAddress 收件人号码
scAddress 短信中心服务号码, 这里设置为null
text 发送内容
sentIntent 发送短信结果状态信号(是否成功发送),new 一个Intent , 操作系统接收到信号后将广播这个Intent.此过程为异步.
deliveryIntent 对方接收状态信号(是否已成功接收).
最后附上详细的代码,如下:
public class YoulainaozhongActivity extends Activity { TextView onetextview; TextView twotextview; TextView threetextview; Button onebutton; Button twobutton; Dialog dialog = null; //新建日历对象,用来设置闹钟时间 Calendar calendar = Calendar.getInstance(); private SharedPreferences sharedPreferences; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); calendar.setTimeInMillis(System.currentTimeMillis()); LinearLayout relativeLayout =(LinearLayout) findViewById(R.id.LinearLayout); relativeLayout.setBackgroundResource(R.drawable.bejing); onebutton = (Button) findViewById(R.id.onebutton); onebutton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { dialog(); } }); twobutton = (Button) findViewById(R.id.twobutton); twobutton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { finish(); } }); onetextview = (TextView) findViewById(R.id.onetextview); twotextview = (TextView) findViewById(R.id.twotextview); threetextview = (TextView) findViewById(R.id.threetextview); sharedPreferences = getSharedPreferences("alarm_record", Activity.MODE_PRIVATE); AlarmManager aManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE); Intent intent = new Intent(this, AlarmReceiver.class); intent.setAction("AlarmReceiver"); PendingIntent pendingIntent=PendingIntent.getBroadcast(this, 0, intent, 0); // aManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent); aManager.setRepeating(AlarmManager.RTC, 0, 60*1000, pendingIntent); } public void dialog(){ View view=getLayoutInflater().inflate(R.layout.shijian, null); final TimePicker timePicker=(TimePicker)view.findViewById(R.id.timepicker); final EditText oneeditext=(EditText)view.findViewById(R.id.oneeditext); final EditText twoeditext=(EditText)view.findViewById(R.id.twoeditext); timePicker.setIs24HourView(true); new AlertDialog.Builder(this).setTitle("设置").setView(view) .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick (DialogInterface dialog, int which) { String timeStr = String.valueOf(timePicker.getCurrentHour()) + ":" + String.valueOf(timePicker.getCurrentMinute()); /* calendar.set(Calendar.HOUR_OF_DAY,timePicker.getCurrentHour()); calendar.set(Calendar.MINUTE, 55); */ onetextview.setText("您设置的时间为: " + timeStr); twotextview.setText("您设置的号码为: " + oneeditext.getText().toString()); threetextview.setText("您设置的内容为: " + twoeditext.getText().toString()); sharedPreferences.edit().putString(timeStr, timeStr).commit(); sharedPreferences.edit().putString("haoma", oneeditext.getText().toString()).commit(); sharedPreferences.edit().putString("neirong", twoeditext.getText().toString()).commit(); } }).setNegativeButton("取消", null).show(); } } public class AlarmReceiver extends BroadcastReceiver { /** * 通过广播进行扫描,是否到达时间后再响起闹铃 * */ @Override public void onReceive(Context context, Intent intent) { SharedPreferences sharedPreferences = context.getSharedPreferences( "alarm_record", Activity.MODE_PRIVATE); String hour = String.valueOf(Calendar.getInstance().get( Calendar.HOUR_OF_DAY)); String minute = String.valueOf(Calendar.getInstance().get( Calendar.MINUTE)); String time = sharedPreferences.getString(hour + ":" + minute, null);// 小时与分, String haoma = sharedPreferences.getString("haoma", null); String neirong = sharedPreferences.getString("neirong", null); if (time != null) {// 判断是否为空,然后通过创建, // MediaPlayer mediaPlayer = MediaPlayer.create(context, R.raw.a); Toast.makeText(context, "短信已经发送成功", Toast.LENGTH_LONG).show(); // mediaPlayer.start();// 开始 ; sendMsg(haoma, neirong); } } private void sendMsg(String number, String message) { SmsManager smsManager = SmsManager.getDefault(); smsManager.sendTextMessage(number, null, message, null, null); } }