Android4.4 藍芽源碼部分分析，android4.4源碼

Android4.4 藍芽源碼部分分析，android4.4源碼
最近GOOGLE發布了Android4.4，看了一下源碼；4.4的藍芽開啟流程這一部分還是有些變化的，從介面上看藍芽開關就是設定settings裡那個switch開關，widget開關當然也可以，起點不同後續的流程是一樣的。先來看systemServer.java的代碼，藍芽服務開啟的地方，真機情況下我們關心的是最後一個else分支。

if (SystemProperties.get("ro.kernel.qemu").equals("1")) {
                Slog.i(TAG, "No Bluetooh Service (emulator)");
            } else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
                Slog.i(TAG, "No Bluetooth Service (factory test)");
            } else if (!context.getPackageManager().hasSystemFeature
                       (PackageManager.FEATURE_BLUETOOTH)) {
                Slog.i(TAG, "No Bluetooth Service (Bluetooth Hardware Not Present)");
            } else if (disableBluetooth) {
                Slog.i(TAG, "Bluetooth Service disabled by config");
            } else {
                Slog.i(TAG, "Bluetooth Manager Service");
                bluetooth = new BluetoothManagerService(context);
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_MANAGER_SERVICE, bluetooth);
            }


看下bluetoothManagerService的構造方法，我們看三個地方， loadStoredNameAndAddress()是讀取藍芽開啟預設名稱的地方，isBluetoothPersistedStateOn()是判斷是否已開啟藍芽的，如果已開啟，後續操作要執行開啟藍芽的動作

BluetoothManagerService(Context context) {
        mHandler = new BluetoothHandler(IoThread.get().getLooper());

        mContext = context;
        mBluetooth = null;
        mQBluetooth = null;
        mBinding = false;
        mUnbinding = false;
        mEnable = false;
        mState = BluetoothAdapter.STATE_OFF;
        mQuietEnableExternal = false;
        mEnableExternal = false;
        mAddress = null;
        mName = null;
        mErrorRecoveryRetryCounter = 0;
        mContentResolver = context.getContentResolver();
        mCallbacks = new RemoteCallbackList<IBluetoothManagerCallback>();
        mQCallbacks = new RemoteCallbackList<IQBluetoothManagerCallback>();
        mStateChangeCallbacks = new RemoteCallbackList<IBluetoothStateChangeCallback>();
        IntentFilter filter = new IntentFilter(Intent.ACTION_BOOT_COMPLETED);
        filter.addAction(BluetoothAdapter.ACTION_LOCAL_NAME_CHANGED);
        filter.addAction(Intent.ACTION_USER_SWITCHED);
        registerForAirplaneMode(filter);
        mContext.registerReceiver(mReceiver, filter);
        loadStoredNameAndAddress();
        if (isBluetoothPersistedStateOn()) {
            mEnableExternal = true;
        }
    }


另外的registerForAirplaneMode方法，如下

private void registerForAirplaneMode(IntentFilter filter) {
        final ContentResolver resolver = mContext.getContentResolver();
        final String airplaneModeRadios = Settings.Global.getString(resolver,
                Settings.Global.AIRPLANE_MODE_RADIOS);
        final String toggleableRadios = Settings.Global.getString(resolver,
                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
        boolean mIsAirplaneSensitive = airplaneModeRadios == null ? true :
                airplaneModeRadios.contains(Settings.Global.RADIO_BLUETOOTH);
        if (mIsAirplaneSensitive) {
            filter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);
        }
    }

其中

Settings.Global.getString(resolver,
                Settings.Global.AIRPLANE_MODE_TOGGLEABLE_RADIOS)



擷取到的值是在String檔案中定義的，如：

<!-- Comma-separated list of bluetooth, wifi, and cell. -->
    <string name="def_airplane_mode_radios" translatable="false">cell,bluetooth,wifi,nfc,wimax</string>


表示如果開啟飛航模式下，哪些服務將會被關閉。所以registerForAirplaneMode方法就是在如果藍芽也受飛航模式影響，那麼飛航模式的變化也將使藍芽服務收到相應廣播。

介面上開關就是BluetoothEnabler.java這個類了，而setBluetoothEnabled()則是具體開關動作。其中有開關的回呼函數，代碼如下：

    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // Show toast message if Bluetooth is not allowed in airplane mode
        if (isChecked
                && (WifiSettings.needPrompt(mContext) || !WirelessSettings.isRadioAllowed(
                        mContext, Settings.Global.RADIO_BLUETOOTH))) {
            Toast.makeText(mContext, R.string.wifi_in_airplane_mode,
                    Toast.LENGTH_SHORT).show();
            // Reset switch to off
            buttonView.setChecked(false);
        }

        // shouldn't setBluetoothEnabled(true) in airplane mode.
        if (mLocalAdapter != null) {
            if (isChecked && WifiSettings.needPrompt(mContext)) {
                return;
            }
            mLocalAdapter.setBluetoothEnabled(isChecked);
        }
        mSwitch.setEnabled(false);
    }

安卓藍芽與單片機通訊代碼，要有源碼有APK,或者軟體可以開啟藍芽模組

download.csdn.net/detail/zxcau102/5280185
 
安卓手機間藍芽檔案傳輸 源碼

請在Eclipse的ADT中安裝官方相關API的SDK，有若干個藍芽demo。