Android example source code file (ServerListActivity.java)

This example Android source code file (ServerListActivity.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, app, arrayadapter, bluetoothadapter, bluetoothdevice, broadcastreceiver, cancel, content, ensure, extra_selected_address, intent, listview, os, override, parcelable, serverlistactivity, string, ui, view, widget

The ServerListActivity.java Android example source code

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.clc.bt;

import android.app.Activity;
import android.app.ListActivity;
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.os.Bundle;
import android.os.Parcelable;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

/**
 * A simple list activity that displays Bluetooth devices that are in
 * discoverable mode. This can be used as a gamelobby where players can see
 * available servers and pick the one they wish to connect to.
 */

public class ServerListActivity extends ListActivity {
    public static String EXTRA_SELECTED_ADDRESS = "btaddress";

    private BluetoothAdapter myBt;

    private ServerListActivity self;

    private ArrayAdapter<String> arrayAdapter;

    private BroadcastReceiver myReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Parcelable btParcel = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            BluetoothDevice btDevice = (BluetoothDevice) btParcel;
            arrayAdapter.add(btDevice.getName() + " - " + btDevice.getAddress());
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        self = this;
        arrayAdapter = new ArrayAdapter<String>(self, R.layout.text);
        ListView lv = self.getListView();
        lv.setAdapter(arrayAdapter);
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
                myBt.cancelDiscovery(); // Cancel BT discovery explicitly so
                // that connections can go through
                String btDeviceInfo = ((TextView) arg1).getText().toString();
                String btHardwareAddress = btDeviceInfo.substring(btDeviceInfo.length() - 17);
                Intent i = new Intent();
                i.putExtra(EXTRA_SELECTED_ADDRESS, btHardwareAddress);
                self.setResult(Activity.RESULT_OK, i);
                finish();
            }
        });
        myBt = BluetoothAdapter.getDefaultAdapter();
        myBt.startDiscovery();
        self.setResult(Activity.RESULT_CANCELED);
    }

    @Override
    protected void onResume() {
        super.onResume();
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        this.registerReceiver(myReceiver, filter);
    }

    @Override
    protected void onPause() {
        super.onPause();
        this.unregisterReceiver(myReceiver);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (myBt != null) {
            myBt.cancelDiscovery(); // Ensure that we don't leave discovery
            // running by accident
        }
    }

}