Android API支持开发可以发送和接收SMS消息的应用程序。目前我们开发过程中使用的Android模拟器还不支持发送SMS，但它可以接收SMS。现在我们来探索一下Android对SMS的支持，我们将会构建一个小小的应用程序来监听移动设备（或模拟器）上接收到的SMS消息，并将它显示出来。
我们来定义一个Intent接收器来处理SMS接收事件：
package com.wissen.sms.receiver;
public class SMSReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO
}
}
package com.wissen.sms.receiver;
public class SMSReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// TODO
}
}
我们需要对这个Intent接收器进行配置以使它能获取SMS接收事件，‘ android.provider.Telephony.SMS_RECEIVED’这个事件状态表示了SMS已被接收。我们可以在AndroidManifest.xml中进行如下配置：
<receiver android:name=”.receiver.SMSReceiver” android:enabled=”true”>
<intent-filter>
<action android:name=”android.provider.Telephony.SMS_RECEIVED” />
</intent-filter>
</receiver>
<receiver android:name=”.receiver.SMSReceiver” android:enabled=”true”>
<intent-filter>
<action android:name=”android.provider.Telephony.SMS_RECEIVED” />
</intent-filter>
</receiver>
为了能让我们的应用能接收SMS,我们得先进行权限的指定，可以在AndroidManifest.xml中如下配置：
<uses-permission android:name=”android.permission.RECEIVE_SMS”></uses-permission>
<uses-permission android:name=”android.permission.RECEIVE_SMS”></uses-permission>
现在，我们的Intent接收器就可以在Android设备接收到SMS的时候被调用了，余下的事情就是去获取和显示接收到的SMS消息文本了：
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
Object messages[] = (Object[]) bundle.get(”pdus”);
SmsMessage smsMessage[] = new SmsMessage[messages.length];
for (int n = 0; n < messages.length; n++) {
smsMessage[n] = SmsMessage.createFromPdu((byte[]) messages[n]);
}
// show first message
Toast toast = Toast.makeText(context, “Received SMS: ” + smsMessage[0].getMessageBody(), Toast.LENGTH_LONG);
toast.show();
}
public void onReceive(Context context, Intent intent) {
Bundle bundle = intent.getExtras();
Object messages[] = (Object[]) bundle.get(”pdus”);
SmsMessage smsMessage[] = new SmsMessage[messages.length];
for (int n = 0; n < messages.length; n++) {
smsMessage[n] = SmsMessage.createFromPdu((byte[]) messages[n]);
}
// show first message
Toast toast = Toast.makeText(context, “Received SMS: ” + smsMessage[0].getMessageBody(), Toast.LENGTH_LONG);
toast.show();
}
Android设备接收到的SMS是以pdu形式的(protocol description unit)。android.telephony.gsm.SmsMessage这个类可以储存SMS的相关信息，我们也可以从接收到的pdu中创建新的SmsMessage实例，Toast界面组件可以以系统通知的形式来显示接收到的SMS消息文本。
运行程序：
现在让我们来在模拟器中运行这个应用程序，以及发送SMS消息到这个模拟器上。我们可以在eclipse的Android插件所提供的DDMS视图(Dalvik Debug Monitor Service)中发送SMS消息到模拟器上（在’Emulator Control’面板中；另外需要指定电话电话号码，不过可以是任意的）
发出广播Intent的方法
public static final String MUSIC_ACTION="com.mythlink.MUSIC";
Intent intent=new Intent();
intent.setAction(MUSIC_ACTION);
intent.putExtra("music_path", songPath);
this.sendBroadcast(intent);
public static final String MUSIC_ACTION="com.mythlink.MUSIC";
Intent intent=new Intent();
intent.setAction(MUSIC_ACTION);
intent.putExtra("music_path", songPath);
this.sendBroadcast(intent);
需要再写一个广播接收器
public class MusicReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Bundle bundle=intent.getExtras();
String music_path=bundle.getString("music_path");
Toast toast=Toast.makeText(context, "Playing music:"+music_path, Toast.LENGTH_LONG);
toast.show();
}
}
public class MusicReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Bundle bundle=intent.getExtras();
String music_path=bundle.getString("music_path");
Toast toast=Toast.makeText(context, "Playing music:"+music_path, Toast.LENGTH_LONG);
toast.show();
}
}
获取联系人信息
public class ContactsList extends ListActivity {
private ListAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor c=this.getContentResolver().query(Contacts.People.CONTENT_URI, null, null, null, null);
this.startManagingCursor(c);
String[] columns=new String[]{Contacts.People.NAME};
int[] names=new int[]{R.id.song};////////////////
mAdapter = new SimpleCursorAdapter(this, R.layout.song_item, c, columns, names);
this.setListAdapter(mAdapter);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i=new Intent(Intent.ACTION_CALL);
Cursor c = (Cursor) mAdapter.getItem(position);
long phoneID = c.getLong(c.getColumnIndex(Contacts.People.PRIMARY_PHONE_ID));
i.setData(ContentUris.withAppendedId(Contacts.Phones.CONTENT_URI, phoneID));
this.startActivity(i);
}
}
public class ContactsList extends ListActivity {
private ListAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Cursor c=this.getContentResolver().query(Contacts.People.CONTENT_URI, null, null, null, null);
this.startManagingCursor(c);
String[] columns=new String[]{Contacts.People.NAME};
int[] names=new int[]{R.id.song};////////////////
mAdapter = new SimpleCursorAdapter(this, R.layout.song_item, c, columns, names);
this.setListAdapter(mAdapter);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i=new Intent(Intent.ACTION_CALL);
Cursor c = (Cursor) mAdapter.getItem(position);
long phoneID = c.getLong(c.getColumnIndex(Contacts.People.PRIMARY_PHONE_ID));
i.setData(ContentUris.withAppendedId(Contacts.Phones.CONTENT_URI, phoneID));
this.startActivity(i);
}
}
在Androidmanifest.xml中加入
<uses-permission android:name="android.permission.READ_CONTACTS"/>
<activity android:name=".ContactsList"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>