蓝牙许可对话相乘
我遇到了奇怪的问题。 根据活动，我通过意向请求蓝牙激活和300秒的可发现性：
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
无论蓝牙是否已经启动，我都会使用它。 通过这样做，对话框权限就像预期的那样显示出来：
“蓝牙许可请求：手机上的应用程序正在请求打开蓝牙和...的权限”
但是，无论我是否放弃，对话框都会持续出现多次。 我不知道为什么。 我的代码：
public class Initial extends Activity {
private Integer REQUEST_ENABLE_BT = 1;
private Integer REQUEST_ENABLE_DISCBT = 2;
private ListView listView;
private ArrayAdapter<String> mArrayAdapter;
TextView editText;
private Global global;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_initial);
this.global= ((Global)this.getApplicationContext());
editText = (TextView) findViewById(R.id.textView1);
global.setAdapter(BluetoothAdapter.getDefaultAdapter());
if (global.getAdapter() == null) {
// Device does not support Bluetooth
editText.setText("Erro: Sistema não suporta Bluetooth!");
finish();
}
listView = (ListView) findViewById(R.id.list);
mArrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);
listView.setAdapter(mArrayAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.initial, menu);
return true;
}
@Override
public void onResume() {
super.onResume(); // Always call the superclass method first
if(!global.getEstado()){
if (!global.getAdapter().isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
else
editText.setText("Bluetooth Ligado!");
global.setReceiver(new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
mArrayAdapter.add(device.getName() + "n" + device.getAddress());
Thread novocliente = new novoCliente(device);
novocliente.start();
}
}
});
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(global.getReceiver(), filter); // Don't forget to unregister during onDestroy
global.getAdapter().startDiscovery();
}
else{
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
}
@Override
protected void onActivityResult (int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == REQUEST_ENABLE_BT){
switch(resultCode){
case RESULT_OK: editText.setText("Bluetooth Ligado!");break;
case RESULT_CANCELED: editText.setText("Impossivel ligar Bluetooth!");finish();break;
}
}
if(requestCode == REQUEST_ENABLE_DISCBT){
switch(resultCode){
case RESULT_CANCELED: editText.setText("Bluetooth não Detetável!");break;
default : editText.setText("Bluetooth Detetável por "+resultCode+" segundos!");
Thread servidor = new ServerSocket();
servidor.start();
break;
}
}
}
@Override
public void onStop() {
super.onStop(); // Always call the superclass method first
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
BluetoothAdapter.getDefaultAdapter().disable();
}
@Override
public void onDestroy() {
super.onDestroy(); // Always call the superclass method first
unregisterReceiver(global.getReceiver()); // Don't forget to unregister during onDestroy
}
}我的可变getEstado（）是一个布尔值，指示应用程序是服务器还是客户端。 如果是真的，它是服务器。 这是问题所在。
任何人都可以帮助我吗？
您要启用的代码位于onResume（）中。 当显示对话框时，您的活动暂停，当它被解散（正面或负面）时，您的活动恢复。 如果对话框为正，那么启用BT适配器也需要一些时间，所以global.getAdapter（）。isEnabled（）仍将返回false。 这就是为什么你要重复显示对话框。
为了解决这个问题，你需要使用不同的触发器（为什么你需要使用onResume？你可以把它放在onCreate中），或者你可以存储状态。 就像是：
private boolean requestedEnable = false;
@Override
public void onResume() {
super.onResume(); // Always call the superclass method first
if(!global.getEstado()){
if (!global.getAdapter().isEnabled()) {
if(!requestedEnable){
requestedEnable = true;
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
else
editText.setText("Bluetooth Ligado!");
global.setReceiver(new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// Add the name and address to an array adapter to show in a ListView
mArrayAdapter.add(device.getName() + "n" + device.getAddress());
Thread novocliente = new novoCliente(device);
novocliente.start();
}
}
});
// Register the BroadcastReceiver
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(global.getReceiver(), filter); // Don't forget to unregister during onDestroy
global.getAdapter().startDiscovery();
}
else{
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
}
我希望你觉得这有帮助。
看看蓝牙聊天示例，这可能会有所帮助
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