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私はJavaプログラミングには新しく、問題があります。イムは、ブルートゥースを使用してarduino車のコントローラで働いています。車は3つの走行モード：テスト,自動とマニュアルを持っています。私はMainActivityを作成し、すべてのモードとボタンに3つのボタンがあるレイアウトを持っています。をBluetooth接続用に接続します。別のアクティビティSecondActivityには、車の方向と速度を制御するためのボタンが付いた別のレイアウトがありますが、驚いたことにmBluetooth.writeは機能しません。他のアクティビティでブルートゥースを使ってデータを送信するにはどうすればよいですか？
これはMainActivityです：
public class MainActivity extends AppCompatActivity {
ImageButton test, manual,connect;
Button back;
private BluetoothAdapter mbluetoothAdapter;
protected AlertDialog.Builder builder;
ConnectThread mBluetooth = new ConnectThread();
String mBluetoothName = "";
String mBluetoothAdress = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Context context = this;
//final LayoutInflater factory = getLayoutInflater();
//final View textEntryView = factory.inflate(R.layout.activity_main);
builder = new AlertDialog.Builder(this);
mbluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
connect = (ImageButton) findViewById(R.id.connect);
test = (ImageButton) findViewById(R.id.test);
manual = (ImageButton) findViewById(R.id.manual);
test.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context,SecondActivity.class);
context.startActivity(intent);
}
});
manual.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context,SecondActivity.class);
context.startActivity(intent);
}
});
connect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!mbluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(enableBtIntent);
} else {
if (!mBluetooth.mBluetoothAddress.equals("")) {//if another connection is already exits then close it first
stopAllActivities();
} else {
try {
Intent serverIntent = new Intent(MainActivity.this, DeviceListActivity.class);
startActivityForResult(serverIntent, Helper.REQUEST_CONNECT_DEVICE);
} catch (Exception e) {
showToast(getString(R.string.errorOccured) + ": " + e.getMessage());
e.printStackTrace();
}
}
}
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case Helper.REQUEST_CONNECT_DEVICE:
if (resultCode == Activity.RESULT_OK) {
mBluetoothName = data.getExtras().getString(Helper.EXTRA_BLUETOOTH_NAME);
mBluetoothAdress = data.getExtras().getString(Helper.EXTRA_BLUETOOTH_ADDRESS);
// setBluetoothInfo();
showToast(R.string.connectedDevice + mBluetoothName);
if (!mBluetoothAdress.equals("")) {
if (!mBluetooth.connect(mBluetoothAdress)){
}
}
}
break;
}
}
private void showToast(String message) {
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
}
private void stopAllActivities() {
mBluetooth.write("S"); //send Stop Signal before it closes the connection
mBluetooth.mBluetoothAddress = ""; // reset address
mBluetooth.close();//close Connection
}
@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();
return super.onOptionsItemSelected(item);
}
@Override
public void onPause() {
if (mbluetoothAdapter != null) {
if (mbluetoothAdapter.isDiscovering()) {
mbluetoothAdapter.cancelDiscovery();
}
}
super.onPause();
}}
そして、これはSecondActivityです：
public class SecondActivity extends AppCompatActivity {
final Context context = this;
Button back;
ImageButton btnup, btndown, btnright, btnleft;
ConnectThread mBluetooth = new ConnectThread();//??????
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
back = (Button) findViewById(R.id.back);
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(context, MainActivity.class);
context.startActivity(intent);
}
});
btnup = (ImageButton) findViewById(R.id.btnup);
btndown = (ImageButton) findViewById(R.id.btndown);
btnleft = (ImageButton) findViewById(R.id.btnleft);
btnright = (ImageButton) findViewById(R.id.btnright);
final TextView direction = (TextView) findViewById(R.id.text_direction);
final TextView steering = (TextView) findViewById(R.id.steering_direction);
final Chronometer chronometer = (Chronometer) findViewById(R.id.chronometer);
btndown.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mBluetooth.write("2");
direction.setText(R.string.Backwards);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mBluetooth.write("x");
direction.setText(R.string.blank);
}
return false;
}
});
btnup.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mBluetooth.write("8");
direction.setText(R.string.Forward);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mBluetooth.write("z");
direction.setText(R.string.blank);
}
return false;
}
});
btnright.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mBluetooth.write("6");
steering.setText(R.string.Right);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mBluetooth.write("c");
steering.setText(R.string.none);
}
return false;
}
});
btnleft.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mBluetooth.write("4");
steering.setText(R.string.Left);
} else if (event.getAction() == MotionEvent.ACTION_UP) {
mBluetooth.write("v");
steering.setText(R.string.none);
}
return false;
}
});
}}
私は1つの活動でBluetooth接続とボタンのコードをテストし、このかもしれ細かい