I'm having a hard time performing a task maybe even simple, for those who are more accustomed to the Java language on Android.
I have an application that has menus with options. One of them is to send TextView 's data to a server on the net. In these TextView 's there are two fields: a topic and a message. However, to send I need to use the option via menu, but I wanted to replace it with a button with onClick() event, it being in the layout where the menu option is visible. My intention is to assign to the button the data that would be filled in TextView , so that you no longer need to populate them (usually fixed data). With this, I want to embed in the button event.
I have the class that treats the TextView reading and sends the data to the server.
I tried some forms: onClick , listener , but nothing worked. The program did not run or run, but the button ran out of action.
I want to use the publish method of class Listener .
Below the complete Listener class:
/**
* Deals with actions performed in the {@link ClientConnections} activity
* and the {@link ConnectionDetails} activity and associated fragments
*/
public class Listener extends implements OnMenuItemClickListener {
/**
* The handle to a {@link Connection} object which contains the {@link MqttAndroidClient} associated with this object
**/
private String clientHandle = null;
/**
* {@link ConnectionDetails} reference used to perform some actions
**/
private ConnectionDetails connectionDetails = null;
/**
* {@link ClientConnections} reference used to perform some actions
**/
private ClientConnections clientConnections = null;
/**
* {@link Context} used to load and format strings
**/
private Context context = null;
/**
* Whether Paho is logging is enabled
**/
static boolean logging = false;
/**
* Constructs a listener object for use with {@link ConnectionDetails} activity and
* associated fragments.
*
* @param connectionDetails The instance of {@link ConnectionDetails}
* @param clientHandle The handle to the client that the actions are to be performed on
*/
public Listener(ConnectionDetails connectionDetails, String clientHandle) {
this.connectionDetails = connectionDetails;
this.clientHandle = clientHandle;
context = connectionDetails;
}
/**
* Constructs a listener object for use with {@link ClientConnections} activity.
*
* @param clientConnections The instance of {@link ClientConnections}
*/
public Listener(ClientConnections clientConnections) {
this.clientConnections = clientConnections;
context = clientConnections;
}
/**
* Perform the needed action required based on the button that
* the user has clicked.
*
* @param item The menu item that was clicked
* @return If there is anymore processing to be done
*/
@Override
public boolean onMenuItemClick(MenuItem item) {
int id = item.getItemId();
switch (id) {
case R.id.publish:
publish();
break;
case R.id.subscribe:
subscribe();
break;
case R.id.newConnection:
createAndConnect();
break;
case R.id.disconnect:
disconnect();
break;
case R.id.connectMenuOption:
reconnect();
break;
case R.id.startLogging:
enablePahoLogging();
break;
case R.id.endLogging:
disablePahoLogging();
break;
}
return false;
}
/**
* Reconnect the selected client
*/
private void reconnect() {
Connections.getInstance(context).getConnection(clientHandle).changeConnectionStatus(ConnectionStatus.CONNECTING);
Connection c = Connections.getInstance(context).getConnection(clientHandle);
try {
c.getClient().connect(c.getConnectionOptions(), null, new ActionListener(context, Action.CONNECT, clientHandle, null));
} catch (MqttSecurityException e) {
Log.e(this.getClass().getCanonicalName(), "Failed to reconnect the client with the handle " + clientHandle, e);
c.addAction("Client failed to connect");
} catch (MqttException e) {
Log.e(this.getClass().getCanonicalName(), "Failed to reconnect the client with the handle " + clientHandle, e);
c.addAction("Client failed to connect");
}
}
/**
* Disconnect the client
*/
private void disconnect() {
Connection c = Connections.getInstance(context).getConnection(clientHandle);
//if the client is not connected, process the disconnect
if (!c.isConnected()) {
return;
}
try {
c.getClient().disconnect(null, new ActionListener(context, Action.DISCONNECT, clientHandle, null));
c.changeConnectionStatus(ConnectionStatus.DISCONNECTING);
} catch (MqttException e) {
Log.e(this.getClass().getCanonicalName(), "Failed to disconnect the client with the handle " + clientHandle, e);
c.addAction("Client failed to disconnect");
}
}
/**
* Subscribe to a topic that the user has specified
*/
private void subscribe() {
String topic = ((EditText) connectionDetails.findViewById(R.id.topic)).getText().toString();
((EditText) connectionDetails.findViewById(R.id.topic)).getText().clear();
RadioGroup radio = (RadioGroup) connectionDetails.findViewById(R.id.qosSubRadio);
int checked = radio.getCheckedRadioButtonId();
int qos = ActivityConstants.defaultQos;
switch (checked) {
case R.id.qos0:
qos = 0;
break;
case R.id.qos1:
qos = 1;
break;
case R.id.qos2:
qos = 2;
break;
}
try {
String[] topics = new String[1];
topics[0] = topic;
Connections.getInstance(context).getConnection(clientHandle).getClient()
.subscribe(topic, qos, null, new ActionListener(context, Action.SUBSCRIBE, clientHandle, topics));
} catch (MqttSecurityException e) {
Log.e(this.getClass().getCanonicalName(), "Failed to subscribe to" + topic + " the client with the handle " + clientHandle, e);
} catch (MqttException e) {
Log.e(this.getClass().getCanonicalName(), "Failed to subscribe to" + topic + " the client with the handle " + clientHandle, e);
}
}
}
Also follows the xml of the Activity_publish layout in which I inserted the button to perform the menu event.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:id="@+id/topicGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/topictextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="35dip"
android:text="@string/topic" />
<EditText
android:id="@+id/lastWillTopic"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="0.22"
android:ems="10"
android:hint="@string/topicHint"
android:inputType="text" />
</LinearLayout>
<LinearLayout
android:id="@+id/messageGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/topicGroup"
android:layout_marginTop="25dp">
<TextView
android:id="@+id/messageTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="15dip"
android:text="@string/message" />
<EditText
android:id="@+id/lastWill"
android:layout_width="0dip"
android:layout_height="wrap_content"
android:layout_weight="0.22"
android:ems="10"
android:hint="@string/messageHint"
android:inputType="textMultiLine" />
</LinearLayout>
<LinearLayout
android:id="@+id/qosGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/messageGroup"
android:layout_marginTop="25dp">
<TextView
android:id="@+id/qosTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="40dp"
android:layout_marginTop="10dp"
android:text="@string/qos" />
<RadioGroup
android:id="@+id/qosRadio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<RadioButton
android:id="@+id/qos0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="@string/qos0" />
<RadioButton
android:id="@+id/qos1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/qos1" />
<RadioButton
android:id="@+id/qos2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/qos2" />
</RadioGroup>
</LinearLayout>
<LinearLayout
android:id="@+id/retainedGroup"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/qosGroup"
android:layout_marginTop="25dp">
<TextView
android:id="@+id/retainedTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:text="@string/retained" />
<CheckBox
android:id="@+id/retained"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/empty" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/retainedGroup"
android:layout_centerHorizontal="true"
android:layout_marginTop="86dp"
android:orientation="vertical">
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Enviar" />
</LinearLayout>