Android Open Source - bluetooth-spp-terminal Device List Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2009 The Android Open Source Project
 */*  w w w .  j  a v a2 s  .  c  o m*/
 * 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 ru.sash0k.bluetooth_terminal.bluetooth;

import android.app.Activity;
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.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

import java.util.HashSet;
import java.util.Set;

import ru.sash0k.bluetooth_terminal.R;


/**
 * This Activity appears as a dialog. It lists already paired devices,
 * and it can scan for devices nearby. When the user selects a device,
 * its MAC address is returned to the caller as the result of this activity.
 */
public class DeviceListActivity extends Activity {

    private static final String TAG = "DeviceListActivity";
    private static final boolean D = false;

    public static final String EXTRA_DEVICE_ADDRESS = "device_address";

    private BluetoothAdapter mBtAdapter;
    private ArrayAdapter<String> mNewDevicesArrayAdapter;
    private final Set<String> mNewDevicesSet = new HashSet<String>();
    private final Set<String> mPairedDevicesSet = new HashSet<String>();

    private ListView newDevicesListView;
    private Button scanButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.device_list);

        // Set default result to CANCELED, in case the user backs out
        setResult(Activity.RESULT_CANCELED);

        // Initialize the button to perform device discovery
        scanButton = (Button) findViewById(R.id.button_scan);
        scanButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                doDiscovery();
                v.setEnabled(false);
            }
        });

        ArrayAdapter<String> pairedDevicesAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
        mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);

        ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
        pairedListView.setAdapter(pairedDevicesAdapter);
        pairedListView.setOnItemClickListener(mDeviceClickListener);

        newDevicesListView = (ListView) findViewById(R.id.new_devices);
        newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
        newDevicesListView.setOnItemClickListener(mDeviceClickListener);

        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        registerReceiver(mReceiver, filter);

        filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        registerReceiver(mReceiver, filter);

        mBtAdapter = BluetoothAdapter.getDefaultAdapter();

        Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();

        if (pairedDevices != null && !pairedDevices.isEmpty()) {
            pairedListView.setEnabled(true);
            findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
            for (BluetoothDevice device : pairedDevices) {
                final String address = device.getAddress();
                mPairedDevicesSet.add(address);
                pairedDevicesAdapter.add(device.getName() + '\n' + address);
            }
        } else {
            pairedListView.setEnabled(false);
            String noDevices = getResources().getText(R.string.none_paired).toString();
            pairedDevicesAdapter.add(noDevices);
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (mBtAdapter != null) {
            mBtAdapter.cancelDiscovery();
        }

        this.unregisterReceiver(mReceiver);
    }

    /**
     * Start device discover with the BluetoothAdapter
     */
    private void doDiscovery() {
        if (D) Log.d(TAG, "doDiscovery()");
        mNewDevicesArrayAdapter.clear();
        mNewDevicesSet.clear();

        setTitle(R.string.search_message);
        findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);
        if (mBtAdapter.isDiscovering()) mBtAdapter.cancelDiscovery();
        mBtAdapter.startDiscovery();
    }

    private final OnItemClickListener mDeviceClickListener = new OnItemClickListener() {
        public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
            // Cancel discovery because it's costly and we're about to connect
            mBtAdapter.cancelDiscovery();

            // Get the device MAC address, which is the last 17 chars in the View
            CharSequence info = ((TextView) v).getText();
            if (info != null) {
                // TODO this is not so cool...
                CharSequence address = info.toString().substring(info.length() - 17);
                Intent intent = new Intent();
                intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

                setResult(Activity.RESULT_OK, intent);
                finish();
            }
        }
    };

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device != null) {
                    String address = device.getAddress();
                    if ((!mNewDevicesSet.contains(address)) && (!mPairedDevicesSet.contains(address))) {
                        newDevicesListView.setEnabled(true);
                        mNewDevicesSet.add(address);
                        String name = device.getName();
                        if ((name == null) || name.isEmpty()) name = getString(R.string.empty_device_name);
                        mNewDevicesArrayAdapter.add(name + '\n' + device.getAddress());
                    }
                } else {
                    Log.e(TAG, "Could not get parcelable extra from device: " + BluetoothDevice.EXTRA_DEVICE);
                }
            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                setTitle(R.string.select_device);
                if (mNewDevicesSet.isEmpty()) {
                    String noDevices = getResources().getText(R.string.none_found).toString();
                    mNewDevicesArrayAdapter.add(noDevices);
                    newDevicesListView.setEnabled(false);
                }
                scanButton.setEnabled(true);
            }
        }
    };
}

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