Android蓝牙通话管理机制
前言：最近遇到一个需求，就是在车载系统上写一个APP，需要控制手机上的通话。之前没有接触过蓝牙，所以稍微了解了一下。 首先手机连接汽车，手机就属于服务端，车载系统属于客户端。在Android源码中，实现了客户端对服务端蓝牙通话的挂断和接听。代码在：/frameworks/base/core/java/android/bluetooth/BluetoothHeadsetClient.java 这里有对应的函数来挂断和接听电话。
接听电话
/**
* Accepts a call
*
* @param device remote device
* @param flag action policy while accepting a call. Possible values {@link #CALL_ACCEPT_NONE},
* {@link #CALL_ACCEPT_HOLD}, {@link #CALL_ACCEPT_TERMINATE}
* @return <code>true</code> if command has been issued successfully; <code>false</code>
* otherwise; upon completion HFP sends {@link #ACTION_CALL_CHANGED} intent.
*/
public boolean acceptCall(BluetoothDevice device, int flag) {
if (DBG) log("acceptCall()");
final IBluetoothHeadsetClient service = mService;
if (service != null && isEnabled() && isValidDevice(device)) {
try {
return service.acceptCall(device, flag);
} catch (RemoteException e) {
Log.e(TAG, Log.getStackTraceString(new Throwable()));
}
}
if (service == null) Log.w(TAG, "Proxy not attached to service");
return false;
}挂断电话
/**
* Rejects a call.
*
* @param device remote device
* @return <code>true</code> if command has been issued successfully; <code>false</code>
* otherwise; upon completion HFP sends {@link #ACTION_CALL_CHANGED} intent.
*
* <p>Feature required for successful execution is being reported by: {@link
* #EXTRA_AG_FEATURE_REJECT_CALL}. This method invocation will fail silently when feature is not
* supported.</p>
*/
public boolean rejectCall(BluetoothDevice device) {
if (DBG) log("rejectCall()");
final IBluetoothHeadsetClient service = mService;
if (service != null && isEnabled() && isValidDevice(device)) {
try {
return service.rejectCall(device);
} catch (RemoteException e) {
Log.e(TAG, Log.getStackTraceString(new Throwable()));
}
}
if (service == null) Log.w(TAG, "Proxy not attached to service");
return false;
}另外对于通话状态的管理在 ：/frameworks/base/core/java/android/bluetooth/BluetoothHeadsetClientCall.java 这里可以获取连接的设备，已经通话状态。
获取当前通话状态
/**
* Gets call's current state.
*
* @return state of this particular phone call.
*/
public int getState() {
return mState;
} /**
* Gets call's device.
*
* @return call device.
*/
public BluetoothDevice getDevice() {
return mDevice;
}起初我是在Android studio上开发的，发现没有这俩个api的jar包，后来才发现这俩个类都是Android的隐藏api，只能系统应用调用，三方应用用不了。如果想用可以采用反射机制来调用。
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原始发表：2019/09/03 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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