void beginListenForData() {
//final Handler handler = new Handler();
final Handler handler = new Handler(Looper.getMainLooper());
final byte delimiter = 10; //This is the ASCII code for a newline character
stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[2048];
workerThread = new Thread(new Runnable() {
public void run() {
while (!Thread.currentThread().isInterrupted() && !stopWorker) {
try {
int bytesAvailable = mmInputStream.available();
if (bytesAvailable > 0) {
byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);
for (int i = 0; i < bytesAvailable; i++) {
byte b = packetBytes[i];
if (b == delimiter) {
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes, "US-ASCII");
readBufferPosition = 0;
handler.post(new Runnable() {
public void run() {
//myLabel.setText(data);
dataArray = new String []{data};
//Log.d("dataArray", data);
}
});
} else {
readBuffer[readBufferPosition++] = b;
}
}
}
} catch (IOException ex) {
stopWorker = true;
}
}
}
});
public class Bluetooth_dataDisplay extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
String MAC = getIntent().getStringExtra("MAC");
mAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice bluetoothDevice = mAdapter.getRemoteDevice(MAC);
// Initiate a connection request in a separate thread
ConnectingThread t = new ConnectingThread(bluetoothDevice);
t.start();
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
adapter = new RecyclerAdapter(dataArray);
recyclerView.setAdapter(adapter);
}
Begindata() is call in the connected thread. I trying to get the dataarray back to the Bluetooth_dataDisplay extends AppCompatActivity and call it in the oncreate. How do I senddataarray back to main activity? Please help any expert. I had look at post that talked about thread data send back to main UI. But I am very new to it, so it quite confusing. :( Help please.
Replace handler call under your beginListenForData() function
handler.post(new Runnable() {
public void run() {
//myLabel.setText(data);
dataArray = new String[]{data};
//Log.d("dataArray", data);
}
});
with runOnUiThread()
runOnUiThread(new Runnable() {
#Override
public void run() {
//myLabel.setText(data);
dataArray = new String[]{data};
//Log.d("dataArray", data);
}
});
Everything under runOnUiThread() runs on UI/Main thread.
Related
I'm work on crate server and android client
but thread doesn't interrupted by android client
My android Client has request for the RoomList from server
and Server receive, Client Accept
and fill in my ListView used the Adapter
here's problem if Click backButton,
than RoomListAcitivity was close and thread was stop
but thread dosen't stop just alive in my app
first Enter has work on sucessfully
but Press BackButton on and re-Enter this Activity
MyApp just White, No Action
how can i stop this thread?
(and sorry for my English skill...)
i tried .interrupt() method , and handler.removeMessages(0)
but failed thread keep alive
upload this full java code just in case...
ListView roomList;
RoomAdapter roomAdapter;
Socketservice ss;
String msg,rtitle;
String msgs[];
String list[];
Thread listthread,EnterRoomThread,removeV;
boolean staterun = true;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_room);
roomList = findViewById(R.id.roomList);
roomAdapter = new RoomAdapter();
listthread = new Thread() {
public void run(){
ss.out.println("163|");
ss.out.println("100|");
try {
while (staterun == true) {
msg = ss.in.readLine();
handler.post(new Runnable() {
public void run() {
msgs = msg.split("\\|");
String protocol = msgs[0];
switch (protocol) {
case "163":
list = msgs[1].split(",");
for (int i = 0; i < list.length; i++) {
String list1[] = list[i].split("-");
String listT = list1[0];
int listC = Integer.parseInt(list1[1]);
int listI = Integer.parseInt(list1[2]);
roomAdapter.CreateRoom(listI, listT, listC);
}
roomList.setAdapter(roomAdapter);
msg = "";
msgs = null;
break;
case "200":
Intent i = new Intent(getApplicationContext(), GameWaitingActivity.class);
i.putExtra("tname", rtitle);
staterun = !staterun;
Toast.makeText(getApplicationContext(),""+listthread.isAlive(),Toast.LENGTH_SHORT).show();
startActivity(i);
finish();
break;
case "201":
Toast.makeText(getApplicationContext(), "방이 꽉 찼습니다.", Toast.LENGTH_SHORT).show();
break;
}
}
});
}
} catch (IOException e) {
}
}
};
listthread.start();
roomList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Room item = (Room) roomList.getItemAtPosition(position);
rtitle=item.getTitle();
EnterRoomThread = new Thread() {
public void run() {
ss.out.println("200|" + rtitle);
EnterRoomThread.interrupt();
}
};
EnterRoomThread.start();
}
});
}
Handler handler = new Handler();
#Override
public void onBackPressed() {
removeV = new Thread() {
public void run(){
ss.out.println("101|");
removeV.interrupt();
}
};
removeV.start();
handler.removeMessages(0);
staterun = false;
listthread.interrupt();
Toast.makeText(getApplicationContext(),""+listthread.isAlive(),Toast.LENGTH_SHORT).show();
finish();
}
}
Go ahead with this, write this inside run() method
//use this boolean value to keep track.
boolean shouldRunFlag = true;
while (shouldRunFlag) {
try {
Thread.sleep(10);
//Do your work............
} catch (Exception e) {
e.printStackTrace();
Log.v(TAG, "Interrupted Exception caught");
// change the flag, so that while loop can be broken.
shouldRunFlag = false;
Log.v(TAG, "run: breaking the loop");
break;
}
}
and this is how you interrupt and clean the thread
private void interrupt(Thread currentThread) {
Log.i(TAG, "interrupt");
if (currentThread != null) {
Thread dummyThread = currentThread;
dummyThread.interrupt();
currentThread = null;
}
}
I have a code here
File file = new File(FilePathname_CUS);
CsvReader csvReader = new CsvReader();
try (CsvParser csvParser = csvReader.parse(file, StandardCharsets.UTF_8)) {
CsvRow row;
if (count_row(FilePathname_SAMPLE) != 0) {
myDb.delete_customer(current_email);
int index = 0;
while ((row = csvParser.nextRow()) != null) {
myDb.insert_customer(
row.getField(0),
row.getField(1),
row.getField(2),
row.getField(3),
row.getField(4),
row.getField(5),
row.getField(6),
row.getField(7),
row.getField(8),
row.getField(9)
);
index++;
float p = (float)index / (float)row_count;
p = p * (float)100;
//mProgressAnimation.setProgress((int)p);
counter_load.setText((int)p);
}
}
}
for every loop i saved the data in database but my target is to update the textview based on current percentage but what happens is that the textview only changes after while loop how can i update it during the loop?
by using new Thread and Handler.
try this code :
File file = new File(FilePathname_CUS);
CsvReader csvReader = new CsvReader();
try (CsvParser csvParser = csvReader.parse(file, StandardCharsets.UTF_8)) {
if (count_row(FilePathname_SAMPLE) != 0) {
myDb.delete_customer(current_email);
Thread thread;
final Handler handler = new Handler();
thread = new Thread(new Runnable() {
public void run() {
int index = 0;
CsvRow row;
while ((row = csvParser.nextRow()) != null) {
myDb.insert_customer(
row.getField(0),
row.getField(1),
row.getField(2),
row.getField(3),
row.getField(4),
row.getField(5),
row.getField(6),
row.getField(7),
row.getField(8),
row.getField(9)
);
index++;
float p = (float)index / (float)row_count;
p = p * (float)100;
handler.post(new Runnable() {
public void run() {
counter_load.setText((int)p);
}
});
try {
// Sleep for 100 milliseconds.
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
});
thread.start();
}
}
Please understand that I am using Google Translator because I do not understand English well.
I am currently working on an application that draws an EMG sensor value sent by Arduino via Bluetooth communication and a smartphone draws a graph based on that value.
Currently the application configuration has one activity and one fragment.
The Bluetooth function is in the activity and the graph is in the fragment.
I want to have the graph drawn only when the value comes in via Bluetooth communication. What should I do?
The code now depends on the fact that the fragment receives a value, even though the fragment is requesting a value.
Fragment
private void feedMultiple() {
if (thread != null)
thread.interrupt();
final Runnable runnable = new Runnable() {
#Override
public void run() {
addEntry();
}
};
thread = new Thread(new Runnable() {
#Override
public void run() {
while (loop) {
// Don't generate garbage runnables inside the loop
getActivity().runOnUiThread(runnable);
try {
Thread.sleep(5);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
break;
}
}
}
});
thread.start();
}
Activity
void beginListenForData() {
final Handler handler = new Handler();
readBufferPosition = 0;
readBuffer = new byte[1024];
mWorkerThread = new Thread(new Runnable()
{
#Override
public void run() {
while(!Thread.currentThread().isInterrupted()) {
try {
int byteAvailable = mInputStream.available();
if(byteAvailable > 0) {
byte[] packetBytes = new byte[byteAvailable];
mInputStream.read(packetBytes);
for(int i=0; i<byteAvailable; i++) {
byte b = packetBytes[i];
if(b == mCharDelimiter) {
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes,"UTF-8");
readBufferPosition = 0;
handler.post(new Runnable(){
#Override
public void run() {
//raw = data.split("#");
bundle.putString("yValue1", data);
}
});
}
else {
readBuffer[readBufferPosition++] = b;
}
}
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "데이터 수신 중 오류가 발생 했습니다.", Toast.LENGTH_LONG).show();
finish();
}
}
}
});
mWorkerThread.start();
}
In my code I have to send a message as long as my ToggleButton is checked. To prevent the UI Thread from freezing, I put the action in a seperate Thread.
My Problem is, that it still freezes, but I don't know why
This is the relevant code:
private ToggleButton.OnClickListener lightMirrorOnClickListener = new ToggleButton.OnClickListener() {
#Override
public void onClick(View v) {
if (lightMirrorBtn.isChecked()) {
lightThread = new LightThread();
lightThread.start();
} else if(!lightMirrorBtn.isChecked()) {
lightThread.interrupt();
}
}
};
class LightThread extends Thread {
Handler lightHandler = new Handler();
Runnable light = new Runnable() {
public void run() {
while (lightMirrorBtn.isChecked()) {
lightTxMsg.frameFormat = ConstantList.STANDARD_FRAME;
lightTxMsg.frameType = ConstantList.DATA_FRAME;
lightTxMsg.dataLength = (byte) 8;
lightTxMsg.messageID = 0x3C1;
int[] messageArray = AMBI_LIGHT;
for (int i = 0; i < lightTxMsg.dataLength; i++) {
lightTxMsg.data[i] = messageArray[i];
}
returnCode = demoController.transmitMessage(lightTxMsg,
ConstantList.BINARY_FORMAT);
}
}
};
public void run() {
while (!isInterrupted()) {
try {
Thread.sleep(60);
lightHandler.post(light);
} catch (InterruptedException e) {
break;
}
}
}
}
EDIT:
This was the solution for the problem:
private ToggleButton.OnCheckedChangeListener lightMirrorOnClickListener = new ToggleButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked == true) {
new Thread(new Runnable() {
public void run() {
lightTxMsg.frameFormat = ConstantList.STANDARD_FRAME;
lightTxMsg.frameType = ConstantList.DATA_FRAME;
lightTxMsg.dataLength = (byte) 8;
lightTxMsg.messageID = 0x3C1;
int[] messageArray = AMBI_LIGHT_ON;
for (int i = 0; i < lightTxMsg.dataLength; i++) {
lightTxMsg.data[i] = messageArray[i];
}
returnCode = demoController.transmitMessage(lightTxMsg,
ConstantList.BINARY_FORMAT);
}
}).start();
} else if (!isChecked) {
new Thread(new Runnable() {
public void run() {
lightTxMsg.frameFormat = ConstantList.STANDARD_FRAME;
lightTxMsg.frameType = ConstantList.DATA_FRAME;
lightTxMsg.dataLength = (byte) 8;
lightTxMsg.messageID = 0x3C1;
int[] messageArray = AMBI_LIGHT_OFF;
for (int i = 0; i < lightTxMsg.dataLength; i++) {
lightTxMsg.data[i] = messageArray[i];
}
returnCode = demoController.transmitMessage(lightTxMsg,
ConstantList.BINARY_FORMAT);
}
}).start();
}
}
};
Handler lightHandler = new Handler();
When you create your handler your thread has not yet started. It is just being created. So, according to the Handler's default constructor documentation this handler is associated "with the Looper for the current thread" ... which is currently the main(UI) thread. So you post your messages on the main thread.
You don't need a Handler to post your runnable on. You can either:
Create a Thread and specify it's actions in the run() method
or
Pass a Runnable to your thread that will be executed in your thread using the Thread(Runnable) constructor
Here are the basic articles about Threads:
Processes and threads
Keeping your app responsive
Specifying the Code to Run on a Thread
I am trying to connect my android phone to a Bluetooth chip on a circuit connected to a sonar sensor. The sensor/circuit is programmed to accept a connection and continuously display data in the form of a message. My code allows me to connect but it won't display data on the screen. Help?
Below you can find my java code.
public class ConnectThread extends Activity {
static BluetoothSocket mmSocket;
static BluetoothSocket mmSocket2;
static BluetoothDevice mmDevice;
static BluetoothDevice mmDevice2;
static InputStream mmInputStream;
static OutputStream mmOutputStream;
static BluetoothAdapter mBluetoothAdapter;
static BluetoothAdapter mBluetoothAdapter2;
TextView myLabel;
TextView Display;
static volatile boolean stopWorker;
static Thread workerThread;
static byte[] readBuffer;
static int readBufferPosition;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_connect_thread);
Button button = (Button)this.findViewById(R.id.button1);
myLabel = (TextView)findViewById(R.id.textView1);
Display = (TextView)findViewById(R.id.Display);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(ConnectThread.this, "Connection in progress", Toast.LENGTH_SHORT).show();
myLabel.setText("Connection in progress");
try
{
findBT();
openBT();
}
catch (IOException ex) { }
}
});}
void findBT()
{
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null)
{
myLabel.setText("No bluetooth adapter available");
}
if(!mBluetoothAdapter.isEnabled())
{
Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBluetooth, 0);
}
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if(pairedDevices.size() > 0)
{
for(BluetoothDevice device1 : pairedDevices)
{
if(device1.getName().equals("HC-05"))
{
mmDevice = device1;
myLabel.setText("Bluetooth Device Found");
break;
}
}
if(pairedDevices.size()==0){myLabel.setText("Please Pair devices");}
}
}
public int openBT() throws IOException
{
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb"); //Standard SerialPortService ID
mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);
mmSocket.connect();
mmOutputStream = mmSocket.getOutputStream();
mmInputStream = mmSocket.getInputStream();
return 1;
}
void ListenForData()
{
final Handler handler = new Handler();
final byte delimiter = 10; //This is the ASCII code for a newline character
stopWorker = false;
readBufferPosition = 0;
readBuffer = new byte[1024];
workerThread = new Thread(new Runnable()
{
public void run()
{
while(!Thread.currentThread().isInterrupted() && !stopWorker)
{
try
{
int bytesAvailable = mmInputStream.available();
if(bytesAvailable > 0)
{
byte[] packetBytes = new byte[bytesAvailable];
mmInputStream.read(packetBytes);
for(int i=0;i<bytesAvailable;i++)
{
byte b = packetBytes[i];
if(b == delimiter)
{
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes, "US-ASCII");
readBufferPosition = 0;
handler.post(new Runnable()
{
public void run()
{
Display.setText(data);
}
});
}
else
{
readBuffer[readBufferPosition++] = b;
}
}
}
}
catch (IOException ex)
{
stopWorker = true;
}
}
}
});
workerThread.start();
}
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action))
{ myLabel.setText("CONNECTED");}
}
void closeBT() throws IOException
{
stopWorker = true;
mmOutputStream.close();
mmInputStream.close();
mmSocket.close();
myLabel.setText("Bluetooth Closed");
}
}
Pass your message using handler like:
public static final int MESSAGE_PROGRESS = 1;
public static final String TOAST = "toast";
Message msg = mHandler.obtainMessage(ConnectThread.MESSAGE_PROGRESS);
Bundle bundle = new Bundle();
bundle.putString(ConnectThread.TOAST, progressMessage);
msg.setData(bundle);
mHandler.sendMessage(msg);
and set Text with help of handler like:
String data;
private final Handler mHandler = new Handler() {
void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_TOAST:
if(data = msg.getData().getString(TOAST)) {
Display.setText(data);
}
}
};