方法によるとBluetoothAdapter.startDiscovery()、検出プロセスには通常、約 12 秒の照会スキャンが含まれます。照会タイム スキャン (12 秒未満) を短縮する方法はありますか?
これは私のMainActivityです：
package com.example.bluetoothsignal;
import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText statusText;
private BluetoothAdapter mBtAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
statusText = (EditText) findViewById(R.id.statusText);
statusText.setText("");
Intent discoverableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(
BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
IntentFilter localIntentFilter1 = new IntentFilter(
"android.bluetooth.device.action.FOUND");
registerReceiver(this.mReceiver, localIntentFilter1);
IntentFilter localIntentFilter2 = new IntentFilter(
"android.bluetooth.adapter.action.DISCOVERY_FINISHED");
registerReceiver(this.mReceiver, localIntentFilter2);
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
this.mBtAdapter = BluetoothAdapter.getDefaultAdapter();
this.mBtAdapter.startDiscovery();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context paramContext, Intent paramIntent) {
String action = paramIntent.getAction();
if ("android.bluetooth.device.action.FOUND".equals(action)) {
BluetoothDevice localBluetoothDevice = (BluetoothDevice) paramIntent
.getParcelableExtra("android.bluetooth.device.extra.DEVICE");
int s = paramIntent.getIntExtra(
"android.bluetooth.device.extra.RSSI", -32768);
short s2 = paramIntent.getShortExtra(
"android.bluetooth.device.extra.RSSI", Short.MIN_VALUE);
int s1 = paramIntent.getIntExtra(BluetoothDevice.EXTRA_RSSI,
Integer.MIN_VALUE);
String state = localBluetoothDevice.getAddress() + "\n"
+ localBluetoothDevice.getName() + "\n" + s + "\n" + s1
+ "\n" + s2;
statusText.setText(statusText.getText().toString() + state);
} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = paramIntent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a
// ListView
statusText.setText(statusText.getText().toString()
+ device.getName() + "\n" + device.getAddress());
} else if (("android.bluetooth.adapter.action.DISCOVERY_FINISHED"
.equals(action))) {
if (MainActivity.this.mBtAdapter.isDiscovering()) {
MainActivity.this.mBtAdapter.cancelDiscovery();
}
statusText.setText("");
MainActivity.this.mBtAdapter.startDiscovery();
}
}
};
}