我决定制作简单的接收/发送短信应用。目前几乎所有功能都运行良好，除了一件事 - 将数据从通知发送到已关闭的应用程序。例如，当用户收到短信并弹出通知时，他会按下它并启动主要活动。在此主要活动中应显示来自短信和发件人编号的文本。但是当我点击通知主要活动启动并且什么也没显示时。
主要活动.java
public class MainActivity extends AppCompatActivity {
public static final String TAG = "logs";
Button sendSms;
EditText address, body;
IntentFilter intentFilter;
TextView receivedSmsTextView;
private BroadcastReceiver smsReceiver = new BroadcastReceiver () {
@Override
public void onReceive (Context context, Intent intent) {
receivedSmsTextView = (TextView) findViewById (R.id.receivedSmsTextView);
receivedSmsTextView.setText ("From : " + intent.getStringExtra ("address") + "\n" +
"Message : " + intent.getStringExtra ("body"));
}
};
@Override
protected void onResume () {
registerReceiver (smsReceiver, intentFilter);
super.onResume ();
}
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_main);
sendSms = (Button) findViewById (R.id.sendButton);
intentFilter = new IntentFilter ("SMS_RECEIVED_ACTION");
sendSms.setOnClickListener (new View.OnClickListener () {
@Override
public void onClick (View v) {
if (!address.getText ().toString ().isEmpty ()) {
onSendSmsButtonClick (address.getText ().toString (), body.getText ().toString ());
address.setText ("");
} else {
Toast.makeText (MainActivity.this, "Enter number", Toast.LENGTH_SHORT).show ();
}
}
});
}
private void onSendSmsButtonClick (String address, String body) {
String SENT = "SMS_SENT";
String DELIVERED = "SMS_DELIVERED";
PendingIntent sentPendingIntent = PendingIntent.getBroadcast (this, 0, new Intent (SENT), PendingIntent.FLAG_UPDATE_CURRENT);
PendingIntent deliveredPendingIntent = PendingIntent.getBroadcast (this, 0, new Intent (DELIVERED), PendingIntent.FLAG_UPDATE_CURRENT);
BroadcastReceiver sentReceiver = new BroadcastReceiver () {
@Override
public void onReceive (Context context, Intent intent) {
switch (getResultCode ()) {
case RESULT_OK:
Toast.makeText (MainActivity.this, "Message sent", Toast.LENGTH_SHORT).show ();
break;
case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
Toast.makeText (MainActivity.this, "Unknown error", Toast.LENGTH_SHORT).show ();
break;
case SmsManager.RESULT_ERROR_NO_SERVICE:
Toast.makeText (MainActivity.this, "Network unavailable", Toast.LENGTH_SHORT).show ();
break;
case SmsManager.RESULT_ERROR_NULL_PDU:
Toast.makeText (MainActivity.this, "No pdu provider detected", Toast.LENGTH_SHORT).show ();
break;
case SmsManager.RESULT_ERROR_RADIO_OFF:
Toast.makeText (MainActivity.this, "Radio off", Toast.LENGTH_SHORT).show ();
break;
}
}
};
registerReceiver (sentReceiver, new IntentFilter (SENT));
BroadcastReceiver deliveredReceiver = new BroadcastReceiver () {
@Override
public void onReceive (Context context, Intent intent) {
switch (getResultCode ()) {
case RESULT_OK:
Toast.makeText (MainActivity.this, "Message delivered", Toast.LENGTH_SHORT).show ();
break;
case RESULT_CANCELED:
Toast.makeText (MainActivity.this, "Message delivery failed", Toast.LENGTH_SHORT).show ();
}
}
};
registerReceiver (deliveredReceiver, new IntentFilter (DELIVERED));
SmsManager sms = SmsManager.getDefault ();
sms.sendTextMessage (address, null, body, sentPendingIntent, deliveredPendingIntent);
}
}
SmsReceiver.java
public class SmsReceiver extends BroadcastReceiver {
private static final int REQUEST_CODE = 800;
public static final String TAG = "logs";
@Override
public void onReceive (Context context, Intent intent) {
Bundle bundle = intent.getExtras ();
SmsMessage[] messages;
String address = "";
String body = "";
if (bundle != null) {
Object[] pdus = (Object[]) bundle.get ("pdus");
messages = new SmsMessage[pdus.length];
for (int i = 0; i < messages.length; i++) {
messages[i] = SmsMessage.createFromPdu ((byte[]) pdus[i]);
address = messages[i].getOriginatingAddress ();
body = messages[i].getMessageBody ().toString ();
}
Toast.makeText (context, address + "\n" + body, Toast.LENGTH_SHORT).show ();
Intent broadcastIntent = new Intent ("SMS_RECEIVED_ACTION")
.putExtra ("address", address)
.putExtra ("body", body);
context.sendBroadcast (broadcastIntent);
sendNotification (address, body, context);
abortBroadcast ();
}
}
private void sendNotification (String address, String body, Context context) {
NotificationCompat.Builder builder = new NotificationCompat.Builder (context);
Intent smsIntent = new Intent (context, MainActivity.class);
smsIntent.putExtra ("address", address).putExtra ("body", body)
.setAction ("SMS_RECEIVED_ACTION")
.setFlags (Intent.FLAG_ACTIVITY_NEW_TASK)//Not sure but problem can be in this flags, but I don't know which flags better to use
.setFlags (Intent.FLAG_ACTIVITY_CLEAR_TOP)
;
PendingIntent smsNotificationPendingIntent = PendingIntent.getActivity (context,
REQUEST_CODE,
smsIntent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentTitle (address)
.setContentText (body)
.setSmallIcon (android.R.drawable.ic_dialog_email)
.setContentIntent (smsNotificationPendingIntent)
.setAutoCancel (true)
;
Notification notification = builder.build ();
NotificationManager manager = (NotificationManager) context.getSystemService (context.NOTIFICATION_SERVICE);
manager.notify (0, notification);
}
}
的Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.example.lexzcq.smsstudy"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity" android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiver android:name=".SmsReceiver">
<intent-filter android:priority="999">
<action android:name="android.provider.Telephony.SMS_RECEIVED"/>
</intent-filter>
</receiver>
</application>
</manifest>
P.S。问题仅在app关闭（从堆栈移动）时出现，在其他情况下它可以正常工作。
答案 0 :(得分：1)
为了从通知中获取数据，将其发送到已关闭的主要活动并在屏幕上显示，您需要通过在onCreate（）方法中调用getIntent（）来获取意图数据。代码看起来像这样：
if (getIntent ().getExtras ()!=null){ //checking if intent send from notification contains any data, otherwise TextView will show "null"
receivedSmsTextView.setText (getIntent ()
.getStringExtra ("address") + "\n" +
getIntent ().getStringExtra ("body"));
}