[英]How to check bluetooth connection state with paired device in Android
我開發了一個藍牙應用程序,它將連接到配對設備並發送消息,但我必須先測試連接。 我嘗試了很多選擇,但沒有任何方法可行。 那么你能給我發一些可以做到的代碼示例嗎? 我創建了一個線程,但是我無法獲得建立“if”函數的良好連接狀態。 這是代碼:
package com.example.szukacz;
import java.lang.reflect.Method;
import java.util.Set;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
LinearLayout sparowaneUrzadzenia;
public void lokalizowanie() {
Intent intencja = new Intent(this, Lokalizator.class);
startActivity(intencja);
}
public void parowanie(View v) {
Intent intencja = new Intent(this, Parowanie.class);
startActivity(intencja);
}
boolean isRunning;
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
String status = (String)msg.obj;
if(status == "polaczony") {
alarm();
showToast("prawda, zwraca" + status);
} else {
showToast("wykonanie x, zwraca: " + status);
};
}
};
public void alarm() {
showToast("Alarm!!!");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sparowaneUrzadzenia = (LinearLayout) findViewById(R.id.listaUrzadzenGlowna);
pokazSparowane();
}
public void onStop() {
super.onStop();
isRunning = false;
}
public void onStart() {
super.onStart();
Thread testPolaczen = new Thread(new Runnable() {
public void run() {
try {
for(int i = 0; i < 1000000; i++) {
Thread.sleep(5000);
testujPolaczenia();
int stan = 0;
String status = Integer.toString(stan);
Message msg = handler.obtainMessage(1, (String)status);
if(isRunning == true) {
handler.sendMessage(msg);
}
}
} catch (Throwable t) {
// watek stop
}
}
});
isRunning = true;
testPolaczen.start();
}
private void testujPolaczenia() {
}
public void pokazSparowane(){
/*
* Wyświetlanie listy sparowanych urządzeń .
* */
Log.d("INFO","Sparowane dla tego urzÄ…dzenia");
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
Log.d("INFO",device.getName()+" - "+device.getAddress());
// dodawanie urzadzen do listy
Button urzadzenie = new Button(getApplicationContext());
urzadzenie.setText(device.getName());
// urzadzenie.setTextColor(0xffffff); //jak ustawic na czarny kolor napsisów ?
urzadzenie.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
showToast("klik");
lokalizowanie();
}
});
sparowaneUrzadzenia.addView(urzadzenie);
}
} else {
showToast("brak sparowanych urzadzen");
}
}
@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 void showToast(String message) {
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
}
@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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
謝謝!
我遇到了同樣的問題,因為我正在使用可能在運行時使用TTS的應用程序。 我認為除了創建廣播接收器和監視藍牙狀態的變化之外,沒有辦法檢查BluetoothAdapter類是否有任何藍牙設備連接。
在我撓了幾個小時之后,我發現了一種非常微妙的方法來解決這個問題。 我試過,它對我來說效果很好。
AudioManager audioManager = (AudioManager) getApplicationContext.getSystemService(Context.AUDIO_SERVICE);
if (audioManager.isBluetoothA2dpOn()) {
//audio is currently being routed to bluetooth -> bluetooth is connected
}
資料來源: http : //developer.android.com/training/managing-audio/audio-output.html
我認為回答你的問題要遲到,但我認為可以幫助某人:
如果您使用Thread,則必須在create主活動中創建BroadcastReceiver:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_digital_metrix_connexion);
BroadcastReceiver bState = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if(action.equals(BluetoothAdapter.ACTION_CONNECTION_STATE_CHANGED))
{
int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE,
BluetoothAdapter.ERROR);
switch (state)
{
case BluetoothAdapter.ACTION_ACL_CONNECTED:
{
//Do something you need here
System.out.println("Connected");
break;
}
default:
System.out.println("Default");
break;
}
}
}
};
}
BluetoothAdapter.STATE_CONNECTED
是多個狀態之一,例如,由於BluetoothAdapter.ACTION_ACL_DISCONNECTED
或BluetoothAdapter.ACTION_ACL_DISCONNECTED_REQUEST
可以檢查設備是否連接或斷開連接。
之后,如果不使用線程,則必須在線程類或主活動中創建過濾器:
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
此過濾器檢查bluetoothadapter狀態。
現在你必須注冊你的過濾器,所以如果你在線程的參數中使用線程傳遞上下文,就像這個context.registerReceiver(bState,filter);
或者在你的主Activity: registerReceiver(bState,filter);
如果您有任何疑問,請不要猶豫,問我。
希望我幫助你。
請閱讀: http : //developer.android.com/guide/topics/connectivity/bluetooth.html這是您需要了解的關於藍牙的一切
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