Push Notification in android

I want to send a push notification using one signal in Android .

I want to collect the data from a textfield and send it to all the users. Please help me.

Code:

    String msg = edittextmessage.getText().toString().trim();      String strJsonBody = "{"          + "\"app_id\": \"myonesignalid\","          + "\"included_segments\": [\"Participant\"],"          + "\"data\": {\"foo\": \"bar\"},"          + "\"contents\": {'en': \\\"\"+ msg +\"\\\"}"          + "}";  

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