我正在开发一个扫描蓝牙低功耗设备的应用程序。扫描的设备存储在数据库中。我的问题是我要显示此数据库中的设备列表，并单击此设备列表项我想要知道设备名称和mac id。任何人都可以帮助我。
public class main_activity extends Activity {
public ImageButton fabbutton;
Activity activity;
DisplayMetrics metrics;
private ArrayAdapter<String> adapter;
private ArrayList<String> liste;
private ListView list;
private AlertDialog.Builder builder;
public EditText input;
String name,address,Devicename,Deviceaddress;
public String SelectedDeviceName;
ProgressDialog progressDialog;
private BluetoothAdapter mBluetoothAdapter;
private Handler mHandler;
private static final int REQUEST_ENABLE_BT = 1;
private static final long SCAN_PERIOD = 10000; // Stops scanning after 10 seconds.
SqlHandler sh = new SqlHandler(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity);
fabbutton = (ImageButton) findViewById(R.id.fabbutton);
final ActionBar mActionBar = getActionBar();
mActionBar.setDisplayHomeAsUpEnabled(true);
mActionBar.setHomeButtonEnabled(true);
mActionBar.setBackgroundDrawable(new ColorDrawable(0xffffffff));
activity = this;
metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
mHandler = new Handler();
//mActionBar.setHomeAsUpIndicator(R.drawable.back);
mActionBar.setTitle(Html.fromHtml("<font color='#727272'>Board List</font>"));
list = (ListView) findViewById(R.id.list);
liste = new ArrayList<String>();
liste.clear();
sh.openDB();
Cursor cur = sh.getAllnames();
while(cur.moveToNext()){
name = cur.getString(0);
address = cur.getString(1);
liste.add(name);
}
adapter = new ArrayAdapter<String>(list.getContext(), android.R.layout.simple_list_item_1, liste);
list.setAdapter(adapter);
sh.close();
// scanDeviceList.setAdapter(mLeDeviceListAdapter);
final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
mBluetoothAdapter = bluetoothManager.getAdapter();
fabbutton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), ScanList.class);
startActivity(intent);
}
});
// On Long Click Listener for Paired BLE Device List
list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
SelectedDeviceName = list.getItemAtPosition(position).toString();
Toast.makeText(getBaseContext(),SelectedDeviceName,Toast.LENGTH_SHORT).show();
showRenameOrDeleteDialog();
return true;
}
});
if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, 1);
}
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// System.out.println("resultCode" + resultCode);
if (resultCode == RESULT_OK) {
}
if (resultCode == RESULT_CANCELED) {
Toast.makeText(this, "Bluetooth is Required", Toast.LENGTH_SHORT).show();
finish();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main_activity, menu);
return true;
}
@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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
if (id == android.R.id.home) {
finish();
}
return super.onOptionsItemSelected(item);
}
private void showRenameOrDeleteDialog() {
//set alert builder to delete or rename the device item
builder = new AlertDialog.Builder(main_activity.this);
builder.setTitle("CREVAVI");
builder.setMessage("Tap on Rename to rename the device, Tap on Delete to remove the device");
builder.setPositiveButton("Rename", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Add your code for the button here.
dialog.dismiss();
Toast.makeText(main_activity.this, "Rename the device", Toast.LENGTH_SHORT).show();
showRenameDialog();
}
});
builder.setNegativeButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Add your code for the button here.
dialog.dismiss();
sh.openDB();
sh.deleteItem(SelectedDeviceName);
sh.close();
notifyDataChange();
}
});
builder.show();
}
private void showRenameDialog() {
final InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, InputMethodManager.HIDE_IMPLICIT_ONLY);
AlertDialog.Builder alert = new AlertDialog.Builder(main_activity.this);
alert.setTitle("Rename the device"); //Set Alert dialog title here
alert.setMessage("Enter new Name Here"); //Message here
// Set an EditText view to get user input
input = new EditText(main_activity.this);
alert.setView(input);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
imm.hideSoftInputFromWindow(input.getWindowToken(), 0);
//You will get as string input data in this variable.
// here we convert the input to a string and show in a toast.
String srt = input.getEditableText().toString();
sh.openDB();
sh.updateData("Hello", srt, SelectedDeviceName);
sh.close();
// adapter.notifyDataSetChanged();
dialog.dismiss();
} // End of onClick(DialogInterface dialog, int whichButton)
}); //End of alert.setPositiveButton
alert.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
imm.hideSoftInputFromWindow(input.getWindowToken(), 0);
// Canceled.
dialog.cancel();
}
}); //End of alert.setNegativeButton
AlertDialog alertDialog = alert.create();
alertDialog.show();
}
public void notifyDataChange(){
liste.clear();
sh.openDB();
Cursor cur = sh.getAllnames();
while(cur.moveToNext()){
String name = cur.getString(0);
liste.add(name);
}
adapter = new ArrayAdapter<String>(list.getContext(), android.R.layout.simple_list_item_1, liste);
list.setAdapter(adapter);
sh.close();
}}