在启动画面之后我有扫描活动，扫描后我将获得ble设备列表。当点击特定项目时，它会移动到设备控制活动。当移动到它时，我想添加进度条/显示< strong>正在连接...... 以下是设备控制活动中的代码。
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
// Show all the supported services and characteristics on the user interface.
connected_alert();
check_forservices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
updateConnectionState(R.string.disconnected);
invalidateOptionsMenu();
create_alert();
} else if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
mConnected = true;
updateConnectionState(R.string.connected);
invalidateOptionsMenu();
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
}
}
};
以下是我的connected_alert（）方法。
public void connected_alert(){
progressDialog = ProgressDialog.show(DeviceControlActivity.this, "", "Connecting...");
new Thread() {
@Override
public void run() {
try{
mBluetoothLeService.connect(mDeviceAddress);
sleep(1000);
if(true)
connection_alert();
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
// dismiss the progress dialog
progressDialog.dismiss();
}
}.start();
}
但在执行此操作时我得到了错误。无法在未调用Looper.prepare（）的线程内创建处理程序
答案 0 :(得分：0)
试试这个
public class MainActivity extends Activity {
ProgressDialog barProgressDialog;
Handler updateBarHandler;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
updateBarHandler = new Handler();
}
public void launchRingDialog(View view) {
final ProgressDialog ringProgressDialog = ProgressDialog.show(MainActivity.this, "Please wait ...", "Connecting", true);
ringProgressDialog.setCancelable(true);
new Thread(new Runnable() {
@Override
public void run() {
try {
// Here you should write your time consuming task...
// Let the progress ring for 10 seconds...
Thread.sleep(10000);
} catch (Exception e) {
}
ringProgressDialog.dismiss();
}
}).start();
}
public void launchBarDialog(View view) {
barProgressDialog = new ProgressDialog(MainActivity.this);
barProgressDialog.setTitle("Please Wait..");
barProgressDialog.setMessage("Connecting ...");
barProgressDialog.setProgressStyle(barProgressDialog.STYLE_HORIZONTAL);
barProgressDialog.setProgress(0);
barProgressDialog.setMax(20);
barProgressDialog.show();
new Thread(new Runnable() {
@Override
public void run() {
try {
// Here you should write your time consuming task...
while (barProgressDialog.getProgress() <= barProgressDialog.getMax()) {
Thread.sleep(2000);
updateBarHandler.post(new Runnable() {
public void run() {
barProgressDialog.incrementProgressBy(2);
}
});
if (barProgressDialog.getProgress() == barProgressDialog.getMax()) {
barProgressDialog.dismiss();
}
}
} catch (Exception e) {
}
}
}).start();
}
}