Android Open Source - wireless-battery-monitor Device List Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * TODO: This file originated from the Bluetooth APIs demos from
 * the Android SDk.  The apache license should be GPL v3 compatible
 * but this file has been modified.  Research is needed to figure
 * out how to properly deal with this situation.
 *//from   w  w w.  j a  va  2  s  .com
 * 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 com.fuzzymonkey.wirelessbatterymonitor.activity;

import java.util.Set;

import com.fuzzymonkey.wirelessbatterymonitor.R;

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.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
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;

/**
 * This Activity appears as a dialog. It lists any paired devices and
 * devices detected in the area after discovery. When a device is chosen
 * by the user, the MAC address of the device is sent back to the parent
 * Activity in the result Intent.
 */
public class DeviceListActivity extends Activity {
    /* Return Intent extra */
    public static String EXTRA_DEVICE_ADDRESS = "device_address";

    /* Member fields */
    private BluetoothAdapter mBtAdapter;
    private ArrayAdapter<String> mPairedDevicesArrayAdapter;
    private ArrayAdapter<String> mNewDevicesArrayAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        /* Setup the window */
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.device_list);

        /* Set result CANCELED incase the user backs out */
        setResult(Activity.RESULT_CANCELED);

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

        /* Initialize array adapters. One for already paired devices and
           one for newly discovered devices*/
        mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
        mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);

        /* Find and set up the ListView for paired devices */
        ListView pairedListView = (ListView) findViewById(R.id.paired_devices);
        pairedListView.setAdapter(mPairedDevicesArrayAdapter);
        pairedListView.setOnItemClickListener(mDeviceClickListener);

        /* Find and set up the ListView for newly discovered devices */
        ListView newDevicesListView = (ListView) findViewById(R.id.new_devices);
        newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
        newDevicesListView.setOnItemClickListener(mDeviceClickListener);

        /* Register for broadcasts when a device is discovered */
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        this.registerReceiver(mReceiver, filter);

        /* Register for broadcasts when discovery has finished */
        filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        this.registerReceiver(mReceiver, filter);

        /* Get the local Bluetooth adapter */
        mBtAdapter = BluetoothAdapter.getDefaultAdapter();

        /* Get a set of currently paired devices */
        Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();

        /* If there are paired devices, add each one to the ArrayAdapter */
        if (pairedDevices.size() > 0) {
            findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
            for (BluetoothDevice device : pairedDevices) {
                mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
            }
        } else {
            String noDevices = getResources().getText(R.string.none_paired).toString();
            mPairedDevicesArrayAdapter.add(noDevices);
        }
    }

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

        /* Make sure we're not doing discovery anymore */
        if (mBtAdapter != null) {
            mBtAdapter.cancelDiscovery();
        }

        /* Unregister broadcast listeners */
        this.unregisterReceiver(mReceiver);
    }

    /**
     * Start device discover with the BluetoothAdapter
     */
    private void doDiscovery() {
        /* Indicate scanning in the title */
        setProgressBarIndeterminateVisibility(true);
        setTitle(R.string.scanning);

        /* Turn on sub-title for new devices */
        findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);

        /* If we're already discovering, stop it */
        if (mBtAdapter.isDiscovering()) {
            mBtAdapter.cancelDiscovery();
        }

        /* Request discover from BluetoothAdapter */
        mBtAdapter.startDiscovery();
    }

    /* The on-click listener for all devices in the ListViews */
    private 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 */
            String info = ((TextView) v).getText().toString();
            String address = info.substring(info.length() - 17);

            /* Create the result Intent and include the MAC address */
            Intent intent = new Intent();
            intent.putExtra(EXTRA_DEVICE_ADDRESS, address);

            /* Set result and finish this Activity */
            setResult(Activity.RESULT_OK, intent);
            finish();
        }
    };

    /* The BroadcastReceiver that listens for discovered devices and
       changes the title when discovery is finished */
    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        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);
                /* If it's already paired, skip it, because it's been listed already */
                if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
                    mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
                }
            /* When discovery is finished, change the Activity title */
            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                setProgressBarIndeterminateVisibility(false);
                setTitle(R.string.select_device);
                if (mNewDevicesArrayAdapter.getCount() == 0) {
                    String noDevices = getResources().getText(R.string.none_found).toString();
                    mNewDevicesArrayAdapter.add(noDevices);
                }
            }
        }
    };
}

Java Source Code List

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