我在我的应用的MainActivity类上处理蓝牙连接。我想在自定义视图中发生触摸事件时发送数据。
public boolean onTouch(View v, MotionEvent event) {
int action=event.getActionMasked();
...
if(action==1){
MainActivity.sendData("P,S," + stringvelocidad + ","+stringrotacion+"&");
}
但是无法从静态方法访问非静态方法。我必须以适当的方式做到这一点？
这是sendData（）方法：
public void sendData(String message) {
try {
outStream=btSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
byte[] msgBuffer = message.getBytes();
Log.d(TAG, "...Sending data: " + message + "...");
try {
outStream.write(msgBuffer);
} catch (IOException e) {
}
try {
outStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
我发布了整个代码
public class EjemploView extends View implements View.OnTouchListener {
private Drawable drawableFader, drawableSlider, drawableLogo;
private Grafico fader1, fader2, slider1, slider2,logo;
Paint pincel=new Paint();
private String stringvelocidad="0",stringrotacion="0";
private int slider1cero,slider2cero;
int oldvelocidad=0;
int oldrotacion=0;
// Cada cuanto queremos procesar cambios (ms)
private static long PERIODO_PROCESO = 1000000;
// Cuando se realizó el último proceso
private long ultimoProceso = 0;
public EjemploView(Context context, AttributeSet attrs) {
super(context,attrs);
setOnTouchListener(this);
Resources res = context.getResources();
drawableFader = res.getDrawable(R.drawable.fader);
drawableSlider=res.getDrawable(R.drawable.slider);
drawableLogo=res.getDrawable(R.drawable.logo);
fader1 = new Grafico(this, drawableFader);
fader2 = new Grafico(this, drawableFader);
slider1 = new Grafico(this, drawableSlider);
slider2 = new Grafico(this, drawableSlider);
logo=new Grafico(this,drawableLogo);
fader1.setAlto(350);
fader1.setAncho(64);
fader2.setAlto(350);
fader2.setAncho(64);
fader2.setAngulo(90);
slider1.setAlto(90);
slider1.setAncho(55);
slider2.setAlto(90);
slider2.setAncho(55);
slider2.setAngulo(90);
logo.setAncho(380);
logo.setAlto(120);
}
@Override
protected void onSizeChanged(int ancho, int alto, int ancho_anter, int alto_anter) {
super.onSizeChanged(ancho, alto, ancho_anter, alto_anter);
// Una vez que conocemos nuestro ancho y alto.
Hilo myThread = new Hilo();
myThread.start();
slider1cero=alto / 4 - 50;
slider2cero=ancho - 277;
fader1.setCenX(ancho / 4 - 31);
fader1.setCenY(alto / 4 - 50);
slider1.setCenX(ancho / 4 - 28);
slider1.setCenY(alto / 4 - 50);
fader2.setCenX(ancho - 271);
fader2.setCenY(alto / 4 - 50);
slider2.setCenX(ancho - 277);
slider2.setCenY(alto / 4 - 50);
logo.setCenX(ancho - 277);
logo.setCenY(100);
}
@Override
synchronized protected void onDraw(Canvas canvas) {
pincel.setColor(Color.BLACK);
pincel.setTextSize(30);
canvas.drawText("Velocidad:", 300, 390, pincel);
canvas.drawText("Rotación:", 300, 430, pincel);
canvas.drawText(stringvelocidad, 450, 390, pincel);
canvas.drawText(stringrotacion, 450, 430, pincel);
fader1.dibujaGrafico(canvas);
fader2.dibujaGrafico(canvas);
slider1.dibujaGrafico(canvas);
slider2.dibujaGrafico(canvas);
logo.dibujaGrafico(canvas);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
int action=event.getActionMasked();
final float x=event.getX();
final float y=event.getY();
if(x>slider1.getCenX()-30 &&x<slider1.getCenX()+30 && y<fader1.getCenY()+fader1.getAlto()/2&&
y>fader1.getCenY()-fader1.getAlto()/2) {
slider1.setCenY((int) y);
}
if(y>fader2.getCenY()-30 &&y<fader2.getCenY()+31&& x<fader2.getCenX()+fader2.getAlto() / 2 &&
x > fader2.getCenX()-fader2.getAlto()/2) {
slider2.setCenX((int) x);
}
if(action==1){
MainActivity.sendData("P,S," + stringvelocidad + "," +stringrotacion+"&");
}
return true;
}
public class Hilo extends Thread {
public void run(){
while(true){
setspeed();
}
}
}
public void setspeed(){
long ahora = System.currentTimeMillis();
int velocidad=-1*(slider1.getCenY()-slider1cero);
int rotacion=slider2.getCenX()-slider2cero;
if (velocidad!=oldvelocidad||rotacion!=oldrotacion) {
stringvelocidad = String.valueOf((int)(velocidad*0.3));
stringrotacion = String.valueOf((int)(rotacion*0.3));
}
ultimoProceso = ahora;
oldvelocidad=velocidad;
oldrotacion=rotacion;
}
和活动代码
public class MainActivity extends Activity {
private static final String TAG = "mensajes";
//-------BLUETOOTH VARIABLES--------//
private static final int REQUEST_ENABLE_BT = 1;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// Well known SPP UUID
private static final UUID MY_UUID =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Insert your bluetooth devices MAC address
private static String address = "00:12:11:21:21:94";
//--------------------------------------//
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
setContentView(R.layout.activity_main);
btAdapter = BluetoothAdapter.getDefaultAdapter();
checkBTState();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
public void onResume() {
super.onResume();
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
// Two things are needed to make a connection:
// A MAC address, which we got above.
// A Service ID or UUID. In this case we are using the
// UUID for SPP.
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
Log.d(TAG, "...Connecting to Remote...");
try {
btSocket.connect();
Log.d(TAG, "...Connection established and data link opened...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
try {
outStream=btSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
//sendData("P");
}
public void onPause() {
super.onPause();
Log.d(TAG, "...In onPause()...");
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
errorExit("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
btSocket.close();
} catch (IOException e2) {
errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
}
}
private void checkBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
errorExit("Fatal Error", "Bluetooth Not supported. Aborting.");
} else {
if (btAdapter.isEnabled()) {
Log.d(TAG, "...Bluetooth is enabled...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(btAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void errorExit(String title, String message){
Toast msg = Toast.makeText(getBaseContext(),
title + " - " + message, Toast.LENGTH_SHORT);
msg.show();
finish();
}
public void sendData(String message) {
try {
outStream=btSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
byte[] msgBuffer = message.getBytes();
Log.d(TAG, "...Sending data: " + message + "...");
try {
outStream.write(msgBuffer);
} catch (IOException e) {
/*String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 37 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
errorExit("Fatal Error", msg);*/
}
try {
outStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
该解决方案一直在创建一个类来处理所有蓝牙连接，并在我的Activity中设置此类的公共静态对象。这使我从自定义视图中访问其方法。