在用户界面上显示值更快速的Android JAVA

Question

我正在开发Android JAVA应用程序，它将BLE与另一台设备结合使用。 所以有两页。一个是用户正在尝试扫描设备并连接。（DeviceControlActivity.java）

如果连接完成，那么用户可以看到主页（MainActivity.java）。 我想马上显示一个值，但需要1~2秒

我认为有一种方法可以在显示主要活动之前获得一个值

• 顺序
  • 用户可连接设备（DeviceControlActivity.java）
  • 广播更新->；从characteristic（BluetoothLeService.java）获取一个值
  • 主要活动->；onCreate->；显示来自BroadcastReceiver（MainActivity.java）的值

设备控制。爪哇

    private final ServiceConnection mServiceConnection = new ServiceConnection() {

        @Override
        public void onServiceConnected(ComponentName componentName, IBinder service) {
            mBluetoothLeService = ((BluetoothLeService.LocalBinder) service).getService();
            if (!mBluetoothLeService.initialize()) {
                Log.e(TAG, "Unable to initialize Bluetooth");
                finish();
            }
            // Automatically connects to the device upon successful start-up initialization.
            Log.w("이게", mDeviceAddress.toString());
            mBluetoothLeService.connect(mDeviceAddress);
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mBluetoothLeService = null;
        }
    };

    private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
                mConnected = true;
            } else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
                mConnected = false;
                //resultText.setBackgroundResource(R.drawable.bleno);
               
            } else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {

                resultText.setText(R.string.bluetoothsucces);
                SharedPreferences sharedPreferences = getSharedPreferences("token", MODE_PRIVATE);
                SharedPreferences.Editor editor = sharedPreferences.edit();
                editor.putString("device", mDeviceName);
                editor.putString("address", mDeviceAddress);
                editor.commit();

                checkblue = true;
                // Show all the supported services and characteristics on the user interface.
            } else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
                Log.w("test", intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
                if (intent.getStringExtra(BluetoothLeService.EXTRA_DATA).contains("}")) {
                    startActivity(new Intent(getApplication(), MainActivity.class));
                    mainDialog.hide();
                }
            }
        }
    };

    // If a given GATT characteristic is selected, check for supported features.  This sample
    // demonstrates 'Read' and 'Notify' features.  See
    // http://d.安卓.com/reference/安卓/bluetooth/BluetoothGatt.html for the complete
    // list of supported characteristic features.
   /* private final ExpandableListView.OnChildClickListener servicesListClickListner =
            new ExpandableListView.OnChildClickListener() {
                @Override
                public boolean onChildClick(ExpandableListView parent, View v, int groupPosition,
                                            int childPosition, long id) {
                    if (mGattCharacteristics != null) {
                        final BluetoothGattCharacteristic characteristic =
                                mGattCharacteristics.get(groupPosition).get(childPosition);
                        final int charaProp = characteristic.getProperties();
                        if ((charaProp | BluetoothGattCharacteristic.PROPERTY_READ) > 0) {
                            mBluetoothLeService.send("{svr}mqtt://52.79.85.42:1883#");
                            mBluetoothLeService.send("{wifi_id}blueshift#");
                            mBluetoothLeService.send("{wifi_pw}blueshift09#");
                            //mBluetoothLeService.readCharacteristic(characteristic);
                        }
                        return true;
                    }
                    return false;
                }
            };*/


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_connect_result);
        bContext = this;
        final Intent intent = getIntent();

        mainDialog = new MainDialog(this);
        mainDialog.setCancelable(false);
        mDeviceName = intent.getStringExtra(EXTRAS_DEVICE_NAME);
        mDeviceAddress = intent.getStringExtra(EXTRAS_DEVICE_ADDRESS);
        addCateDialog = new BluetoothDialogResult(this);
        addCateDialog.setCancelable(false);
        deviceSearch = findViewById(R.id.deviceSearch);
        resultText = findViewById(R.id.maintext);
        mainDialog.show();
        deviceSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addCateDialog.show();
            }
        });

        Handler mHandler = new Handler();
        mHandler.postDelayed(new Runnable() {
            public void run() {
                if (checkblue == false) {
                    mainDialog.hide();
                    deviceSearch.setText("");
                    resultText.setText(".");
                }
            }
        }, 10000);

        Intent gattServiceIntent = new Intent(this, BluetoothLeService.class);
        bindService(gattServiceIntent, mServiceConnection, BIND_AUTO_CREATE);

    }

    @Override
    protected void onResume() {
        super.onResume();
        registerReceiver(mGattUpdateReceiver, makeGattUpdateIntentFilter());
        if (mBluetoothLeService != null) {
            final boolean result = mBluetoothLeService.connect(mDeviceAddress);
            Log.d(TAG, "Connect request result=" + result);
        }
    }

蓝牙服务。爪哇

private void broadcastUpdate(final String action,
                                 final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);
        String batteryLevelString ="batteryLevel:";
        // This is special handling for the Heart Rate Measurement profile. Data
        // parsing is carried out as per profile specifications.
        if(UUID_BATTERY_LEVEL.equals(characteristic.getUuid())) {
            final byte[] batteryLevel = characteristic.getValue();
            if (batteryLevel[0] == 49 && batteryLevel[1] == 48 && batteryLevel[2] == 48)
            {
                batteryLevelString = batteryLevelString.concat("100");
                intent.putExtra(EXTRA_DATA, String.valueOf(batteryLevelString));
            }
            else{
                String aString = new String(batteryLevel);
                batteryLevelString = batteryLevelString.concat(aString);
                intent.putExtra(EXTRA_DATA, String.valueOf(batteryLevelString));
            }
            // { 57,49, 0}  {31, 30, 30}
        }
        else {
                // For all other profiles, writes the data formatted in HEX.
                final byte[] data = characteristic.getValue();
                if (data != null && data.length > 0) {
                    String temp = new String(data);
                     temp = temp.substring(4, temp.length());
                    intent.putExtra(EXTRA_DATA, temp);
            }
        }
    sendBroadcast(intent);
}

主要活动。爪哇

private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
                if (intent.getStringExtra(BluetoothLeService.EXTRA_DATA).contains("batteryLevel:")) {
                    batterylevel = "";
                    batterylevel += intent.getStringExtra(BluetoothLeService.EXTRA_DATA);
                    batterylevel = batterylevel.substring(13);
                    txtBatteryLevel.setText(batterylevel + "%");
                }
}