registerReceiver 動態註冊與 sendBroadcast 原始碼解析
阿新 • • 發佈：2018-12-21
廣播的註冊分為動態註冊和靜態註冊，靜態註冊主要在開機後PackageManagerService 利用 AndroidManifest 掃描 安裝的apk 獲取AndroidManifest內註冊的 廣播 所以 忽略 靜態註冊。今天主要介紹 動態廣播的註冊。
1. 簡單舉例
IntentFilter filter = new IntentFilter();
filter.addAction("android.my.action");
registerReceiver(broadcastReceiver, filter);//註冊監聽一般註冊的程式碼如上。
2. 呼叫 ContextImpl 的 registerReceiver
@Override
public Intent registerReceiver(
BroadcastReceiver receiver, IntentFilter filter) {
return mBase.registerReceiver(receiver, filter);
}3.
- 最後呼叫到 registerReceiverInternal ，並將 BroadcastReceiver 封裝成 IIntentReceiver
- IIntentReceiver 繼承 IIntentReceiver.Stub 方便 跨程序條用
- 呼叫 ActivityManagerService 的 registerReceiver 方法 註冊
@Override public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter) { return registerReceiver(receiver, filter, null, null); } @Override public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter, String broadcastPermission, Handler scheduler) { return registerReceiverInternal(receiver, getUserId(), filter, broadcastPermission, scheduler, getOuterContext()); } @Override public Intent registerReceiverAsUser(BroadcastReceiver receiver, UserHandle user, IntentFilter filter, String broadcastPermission, Handler scheduler) { return registerReceiverInternal(receiver, user.getIdentifier(), filter, broadcastPermission, scheduler, getOuterContext()); } private Intent registerReceiverInternal(BroadcastReceiver receiver, int userId, IntentFilter filter, String broadcastPermission, Handler scheduler, Context context) { IIntentReceiver rd = null; if (receiver != null) { if (mPackageInfo != null && context != null) { if (scheduler == null) { scheduler = mMainThread.getHandler(); } rd = mPackageInfo.getReceiverDispatcher( receiver, context, scheduler, mMainThread.getInstrumentation(), true); } else { if (scheduler == null) { scheduler = mMainThread.getHandler(); } rd = new LoadedApk.ReceiverDispatcher( receiver, context, scheduler, null, true).getIIntentReceiver(); } } try { return ActivityManagerNative.getDefault().registerReceiver( mMainThread.getApplicationThread(), mBasePackageName, rd, filter, broadcastPermission, userId); } catch (RemoteException e) { return null; } }
4 .registerReceiver 方法 集成了 主要的註冊函式
- 獲取 符合 過濾器條件的 粘性廣播
- mRegisteredReceivers 用 IIntentReceiver asBind 做key ReceiverList 做 value 。ReceiverList 內 儲存 一個BroadcastReceiver 的 所有 過濾資訊 。BroadcastReceiver 記錄所有廣播的所有過濾資訊。
- 如果找到了符合條件的廣播則發射廣播
public Intent registerReceiver(IApplicationThread caller, String callerPackage,
IIntentReceiver receiver, IntentFilter filter, String permission, int userId) {
。。。。。
List allSticky = null;
// Look for any matching sticky broadcasts...
//獲取符合 過濾 器 的 粘性廣播
Iterator actions = filter.actionsIterator();
if (actions != null) {
while (actions.hasNext()) {
String action = (String)actions.next();
allSticky = getStickiesLocked(action, filter, allSticky,
UserHandle.USER_ALL);
allSticky = getStickiesLocked(action, filter, allSticky,
UserHandle.getUserId(callingUid));
}
} else {
allSticky = getStickiesLocked(null, filter, allSticky,
UserHandle.USER_ALL);
allSticky = getStickiesLocked(null, filter, allSticky,
UserHandle.getUserId(callingUid));
}
// The first sticky in the list is returned directly back to
// the client.
//返回第一個粘性的廣播
Intent sticky = allSticky != null ? (Intent)allSticky.get(0) : null;
if (DEBUG_BROADCAST) Slog.v(TAG, "Register receiver " + filter
+ ": " + sticky);
if (receiver == null) {
return sticky;
}
// ReceiverList 繼承 ArrayList 的集合
ReceiverList rl
= (ReceiverList)mRegisteredReceivers.get(receiver.asBinder());
if (rl == null) {
rl = new ReceiverList(this, callerApp, callingPid, callingUid,
userId, receiver);
if (rl.app != null) {
rl.app.receivers.add(rl);
} else {
try {
receiver.asBinder().linkToDeath(rl, 0);
} catch (RemoteException e) {
return sticky;
}
rl.linkedToDeath = true;
}
//記錄廣播
mRegisteredReceivers.put(receiver.asBinder(), rl);
} else if (rl.uid != callingUid) {
throw new IllegalArgumentException(
"Receiver requested to register for uid " + callingUid
+ " was previously registered for uid " + rl.uid);
} else if (rl.pid != callingPid) {
throw new IllegalArgumentException(
"Receiver requested to register for pid " + callingPid
+ " was previously registered for pid " + rl.pid);
} else if (rl.userId != userId) {
throw new IllegalArgumentException(
"Receiver requested to register for user " + userId
+ " was previously registered for user " + rl.userId);
}
BroadcastFilter bf = new BroadcastFilter(filter, rl, callerPackage,
permission, callingUid, userId);
//記錄下註冊廣播的所有過濾器
rl.add(bf);
if (!bf.debugCheck()) {
Slog.w(TAG, "==> For Dynamic broadast");
}
//記錄下BroadcastFilter 在後期會從BroadcastFilter裡面 找尋符合條件的 廣播接收者
mReceiverResolver.addFilter(bf);
// Enqueue broadcasts for all existing stickies that match
// this filter.
//如果有符合條件的 粘性廣播 那麼就傳送
if (allSticky != null) {
ArrayList receivers = new ArrayList();
receivers.add(bf);
int N = allSticky.size();
for (int i=0; i<N; i++) {
Intent intent = (Intent)allSticky.get(i);
BroadcastQueue queue = broadcastQueueForIntent(intent);
BroadcastRecord r = new BroadcastRecord(queue, intent, null,
null, -1, -1, null, null, AppOpsManager.OP_NONE, receivers, null, 0,
null, null, false, true, true, -1);
// 新增記錄
queue.enqueueParallelBroadcastLocked(r);
//執行 傳送廣播
queue.scheduleBroadcastsLocked();
}
}
return sticky;
}
}5. sendBroadcast 解析
廣播 的傳送分為 無序廣播，有序廣播 ，粘性廣播 。 有序廣播 就是 按照 等級 順序 接收 廣播 。粘性廣播 就是 在第一次傳送 廣播之後 註冊 新的廣播 成功能夠接收之前的廣播。取 無序廣播 來解析。
傳送 無序廣播例子 如下
Intent intent = new Intent();
intent.setAction("android.my.action");
sendBroadcast(intent);6. sendBroadcast 呼叫 ContextImple 的 sendBroadcast 傳送
@Override
public void sendBroadcast(Intent intent) {
mBase.sendBroadcast(intent);
}7. sendBroadcast 在 遠端條用 ActivityManagerService 的 broadcastIntent 傳送
@Override
public void sendBroadcast(Intent intent) {
warnIfCallingFromSystemProcess();
String resolvedType = intent.resolveTypeIfNeeded(getContentResolver());
try {
intent.prepareToLeaveProcess();
ActivityManagerNative.getDefault().broadcastIntent(
mMainThread.getApplicationThread(), intent, resolvedType, null,
Activity.RESULT_OK, null, null, null, AppOpsManager.OP_NONE, false, false,
getUserId());
} catch (RemoteException e) {
}
}8.
public final int broadcastIntent(IApplicationThread caller,
Intent intent, String resolvedType, IIntentReceiver resultTo,
int resultCode, String resultData, Bundle map,
String requiredPermission, int appOp, boolean serialized, boolean sticky, int userId) {
enforceNotIsolatedCaller("broadcastIntent");
synchronized(this) {
//校驗Intent
intent = verifyBroadcastLocked(intent);
final ProcessRecord callerApp = getRecordForAppLocked(caller);
final int callingPid = Binder.getCallingPid();
final int callingUid = Binder.getCallingUid();
final long origId = Binder.clearCallingIdentity();
int res = broadcastIntentLocked(callerApp,
callerApp != null ? callerApp.info.packageName : null,
intent, resolvedType, resultTo,
resultCode, resultData, map, requiredPermission, appOp, serialized, sticky,
callingPid, callingUid, userId);
Binder.restoreCallingIdentity(origId);
return res;
}
}9. broadcastIntentLocked 主要的功能 就是 找到符合 條件的 BroadcastReceiver
-
檢查 傳送的廣播是否是粘性廣播 如果是的話 記錄下來
-
PackageManagerService 獲取 靜態註冊 符合 條件 的 Broadcas Reciver，從 mReceiverResolver 獲取 符合條件的 動態註冊的 Broadcas Reciver
-
如果不是有序的 則直接 建立 任務BroadcastRecord加入到BroadcastQueue中 queue.enqueueParallelBroadcastLocked(r);並要求 queue 執行 任務 queue.scheduleBroadcastsLocked();
private final int broadcastIntentLocked(ProcessRecord callerApp,
String callerPackage, Intent intent, String resolvedType,
IIntentReceiver resultTo, int resultCode, String resultData,
Bundle map, String requiredPermission, int appOp,
boolean ordered, boolean sticky, int callingPid, int callingUid,
int userId) {
。。。。。。
// Add to the sticky list if requested.
// 如果傳送的 是粘性 廣播
if (sticky) {
// 檢查是否有許可權
if (checkPermission(android.Manifest.permission.BROADCAST_STICKY,
callingPid, callingUid)
!= PackageManager.PERMISSION_GRANTED) {
String msg = "Permission Denial: broadcastIntent() requesting a sticky broadcast from pid="
+ callingPid + ", uid=" + callingUid
+ " requires " + android.Manifest.permission.BROADCAST_STICKY;
Slog.w(TAG, msg);
throw new SecurityException(msg);
}
//粘性廣播不能 要求許可權
if (requiredPermission != null) {
Slog.w(TAG, "Can't broadcast sticky intent " + intent
+ " and enforce permission " + requiredPermission);
return ActivityManager.BROADCAST_STICKY_CANT_HAVE_PERMISSION;
}
//粘性 廣播不能 顯示 指定目標
if (intent.getComponent() != null) {
throw new SecurityException(
"Sticky broadcasts can't target a specific component");
}
// We use userId directly here, since the "all" target is maintained
// as a separate set of sticky broadcasts.
//目標不是 所用使用者
if (userId != UserHandle.USER_ALL) {
// But first, if this is not a broadcast to all users, then
// make sure it doesn't conflict with an existing broadcast to
// all users.
ArrayMap<String, ArrayList<Intent>> stickies = mStickyBroadcasts.get(
UserHandle.USER_ALL);
if (stickies != null) {
ArrayList<Intent> list = stickies.get(intent.getAction());
if (list != null) {
int N = list.size();
int i;
for (i=0; i<N; i++) {
//和 以前 的廣播一致 則拋異常
if (intent.filterEquals(list.get(i))) {
throw new IllegalArgumentException(
"Sticky broadcast " + intent + " for user "
+ userId + " conflicts with existing global broadcast");
}
}
}
}
}
// 根據 userId分組 粘性廣播
ArrayMap<String, ArrayList<Intent>> stickies = mStickyBroadcasts.get(userId);
if (stickies == null) {
stickies = new ArrayMap<String, ArrayList<Intent>>();
mStickyBroadcasts.put(userId, stickies);
}
// 根據 action 分組 粘性廣播
ArrayList<Intent> list = stickies.get(intent.getAction());
if (list == null) {
list = new ArrayList<Intent>();
stickies.put(intent.getAction(), list);
}
int N = list.size();
int i;
//和集合內以前 的 Intent 進行比較 條件十分一致 ，一致的話進行替換
for (i=0; i<N; i++) {
if (intent.filterEquals(list.get(i))) {
// This sticky already exists, replace it.
list.set(i, new Intent(intent));
break;
}
}
//新增到尾部
if (i >= N) {
list.add(new Intent(intent));
}
}
int[] users;
// 給所有 開始的使用者
if (userId == UserHandle.USER_ALL) {
// Caller wants broadcast to go to all started users.
users = mStartedUserArray;
} else {
// Caller wants broadcast to go to one specific user.
users = new int[] {userId};
}
// Figure out who all will receive this broadcast.
List receivers = null;
List<BroadcastFilter> registeredReceivers = null;
// Need to resolve the intent to interested receivers...
//Intent.FLAG_RECEIVER_REGISTERED_ONL 不能傳送到Manifest檔案註冊的廣播
if ((intent.getFlags()&Intent.FLAG_RECEIVER_REGISTERED_ONLY)
== 0) {
//獲取符合條件的在Manifest檔案註冊的廣播
receivers = collectReceiverComponents(intent, resolvedType, callingUid, users);
}
if (intent.getComponent() == null) {
if (userId == UserHandle.USER_ALL && callingUid == Process.SHELL_UID) {
// Query one target user at a time, excluding shell-restricted users
UserManagerService ums = getUserManagerLocked();
for (int i = 0; i < users.length; i++) {
if (ums.hasUserRestriction(
UserManager.DISALLOW_DEBUGGING_FEATURES, users[i])) {
continue;
}
//獲取符合條件的 動態註冊的廣播
List<BroadcastFilter> registeredReceiversForUser =
mReceiverResolver.queryIntent(intent,
resolvedType, false, users[i]);
if (registeredReceivers == null) {
registeredReceivers = registeredReceiversForUser;
} else if (registeredReceiversForUser != null) {
registeredReceivers.addAll(registeredReceiversForUser);
}
}
} else {
registeredReceivers = mReceiverResolver.queryIntent(intent,
resolvedType, false, userId);
}
}
final boolean replacePending =
(intent.getFlags()&Intent.FLAG_RECEIVER_REPLACE_PENDING) != 0;
if (DEBUG_BROADCAST) Slog.v(TAG, "Enqueing broadcast: " + intent.getAction()
+ " replacePending=" + replacePending);
//符合要求的程式碼註冊的廣播接收者數量
int NR = registeredReceivers != null ? registeredReceivers.size() : 0;
//如果 不是有序廣播 並且 找到了 符合條件動態註冊的 廣播接收者
if (!ordered && NR > 0) {
//如果不是有序的廣播的話，先執行程式碼註冊的廣播接收者
// If we are not serializing this broadcast, then send the
// registered receivers separately so they don't wait for the
// components to be launched.
final BroadcastQueue queue = broadcastQueueForIntent(intent);
BroadcastRecord r = new BroadcastRecord(queue, intent, callerApp,
callerPackage, callingPid, callingUid, resolvedType, requiredPermission,
appOp, registeredReceivers, resultTo, resultCode, resultData, map,
ordered, sticky, false, userId);
if (DEBUG_BROADCAST) Slog.v(
TAG, "Enqueueing parallel broadcast " + r);
final boolean replaced = replacePending && queue.replaceParallelBroadcastLocked(r);
if (!replaced) {
queue.enqueueParallelBroadcastLocked(r);
queue.scheduleBroadcastsLocked();
}
registeredReceivers = null;
NR = 0;
}
// Merge into one list.
int ir = 0;
if (receivers != null) {
// A special case for PACKAGE_ADDED: do not allow the package
// being added to see this broadcast. This prevents them from
// using this as a back door to get run as soon as they are
// installed. Maybe in the future we want to have a special install
// broadcast or such for apps, but we'd like to deliberately make
// this decision.
String skipPackages[] = null;
if (Intent.ACTION_PACKAGE_ADDED.equals(intent.getAction())
|| Intent.ACTION_PACKAGE_RESTARTED.equals(intent.getAction())
|| Intent.ACTION_PACKAGE_DATA_CLEARED.equals(intent.getAction())) {
Uri data = intent.getData();
if (data != null) {
String pkgName = data.getSchemeSpecificPart();
if (pkgName != null) {
skipPackages = new String[] { pkgName };
}
}
} else if (Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE.equals(intent.getAction())) {
skipPackages = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
}
if (skipPackages != null && (skipPackages.length > 0)) {
for (String skipPackage : skipPackages) {
if (skipPackage != null) {
int NT = receivers.size();
for (int it=0; it<NT; it++) {
ResolveInfo curt = (ResolveInfo)receivers.get(it);
if (curt.activityInfo.packageName.equals(skipPackage)) {
receivers.remove(it);
it--;
NT--;
}
}
}
}
}
int NT = receivers != null ? receivers.size() : 0;
int it = 0;
ResolveInfo curt = null;
BroadcastFilter curr = null;
//排序
while (it < NT && ir < NR) {
if (curt == null) {
curt = (ResolveInfo)receivers.get(it);
}
if (curr == null) {
curr = registeredReceivers.get(ir);
}
if (curr.getPriority() >= curt.priority) {
// Insert this broadcast record into the final list.
receivers.add(it, curr);
ir++;
curr = null;
it++;
NT++;
} else {
// Skip to the next ResolveInfo in the final list.
it++;
curt = null;
}
}
}
//剩餘的放後面
while (ir < NR) {
if (receivers == null) {
receivers = new ArrayList();
}
receivers.add(registeredReceivers.get(ir));
ir++;
}
if ((receivers != null && receivers.size() > 0)
|| resultTo != null) {
BroadcastQueue queue = broadcastQueueForIntent(intent);
BroadcastRecord r = new BroadcastRecord(queue, intent, callerApp,
callerPackage, callingPid, callingUid, resolvedType,
requiredPermission, appOp, receivers, resultTo, resultCode,
resultData, map, ordered, sticky, false, userId);
if (DEBUG_BROADCAST) Slog.v(
TAG, "Enqueueing ordered broadcast " + r
+ ": prev had " + queue.mOrderedBroadcasts.size());
if (DEBUG_BROADCAST) {
int seq = r.intent.getIntExtra("seq", -1);
Slog.i(TAG, "Enqueueing broadcast " + r.intent.getAction() + " seq=" + seq);
}
boolean replaced = replacePending && queue.replaceOrderedBroadcastLocked(r);
if (!replaced) {
queue.enqueueOrderedBroadcastLocked(r);
queue.scheduleBroadcastsLocked();
}
}
return ActivityManager.BROADCAST_SUCCESS;
｝ 10 BroadcastQueue.scheduleBroadcastsLocked
只是簡單 的sendMessage
public void scheduleBroadcastsLocked() {
if (DEBUG_BROADCAST) Slog.v(TAG, "Schedule broadcasts ["
+ mQueueName + "]: current="
+ mBroadcastsScheduled);
if (mBroadcastsScheduled) {
return;
}
mHandler.sendMessage(mHandler.obtainMessage(BROADCAST_INTENT_MSG, this));
mBroadcastsScheduled = true;
}11. 執行 廣播 接收 processNextBroadcast
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case BROADCAST_INTENT_MSG: {
if (DEBUG_BROADCAST) Slog.v(
TAG, "Received BROADCAST_INTENT_MSG");
processNextBroadcast(true);
} break;
case BROADCAST_TIMEOUT_MSG: {
synchronized (mService) {
broadcastTimeoutLocked(true);
}
} break;
}
}12 . processNextBroadcast
簡略 介紹 無序廣播 的傳送
1. 遍歷 任務佇列 編列 裡面 的BroadCastFilter
2. deliverToRegisteredReceiverLocked 檢查 許可權是否符合
final void processNextBroadcast(boolean fromMsg) {
。。。。。。
// First, deliver any non-serialized broadcasts right away.
//執行無序的佇列
while (mParallelBroadcasts.size() > 0) {
r = mParallelBroadcasts.remove(0);
r.dispatchTime = SystemClock.uptimeMillis();
r.dispatchClockTime = System.currentTimeMillis();
final int N = r.receivers.size();
if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG, "Processing parallel broadcast ["
+ mQueueName + "] " + r);
for (int i=0; i<N; i++) {
Object target = r.receivers.get(i);
if (DEBUG_BROADCAST) Slog.v(TAG,
"Delivering non-ordered on [" + mQueueName + "] to registered "
+ target + ": " + r);
deliverToRegisteredReceiverLocked(r, (BroadcastFilter)target, false);
}
addBroadcastToHistoryLocked(r);
if (DEBUG_BROADCAST_LIGHT) Slog.v(TAG, "Done with parallel broadcast ["
+ mQueueName + "] " + r);
}
。。。。。。
｝13. deliverToRegisteredReceiverLocked
1. 檢查許可權 是否符合
2. 不符合直接跳過 ，符合 呼叫 performReceiveLocked
private final void deliverToRegisteredReceiverLocked(BroadcastRecord r,
BroadcastFilter filter, boolean ordered) {
boolean skip = false;
。。。。。
//這段程式碼是檢查許可權的 就不介紹了
if (!skip) {
// If this is not being sent as an ordered broadcast, then we
// don't want to touch the fields that keep track of the current
// state of ordered broadcasts.
if (ordered) {
r.receiver = filter.receiverList.receiver.asBinder();
r.curFilter = filter;
filter.receiverList.curBroadcast = r;
r.state = BroadcastRecord.CALL_IN_RECEIVE;
if (filter.receiverList.app != null) {
// Bump hosting application to no longer be in background
// scheduling class. Note that we can't do that if there
// isn't an app... but we can only be in that case for
// things that directly call the IActivityManager API, which
// are already core system stuff so don't matter for this.
r.curApp = filter.receiverList.app;
filter.receiverList.app.curReceiver = r;
mService.updateOomAdjLocked(r.curApp);
}
}
try {
if (DEBUG_BROADCAST_LIGHT) {
int seq = r.intent.getIntExtra("seq", -1);
Slog.i(TAG, "Delivering to " + filter
+ " (seq=" + seq + "): " + r);
}
//遠端呼叫
performReceiveLocked(filter.receiverList.app, filter.receiverList.receiver,
new Intent(r.intent), r.resultCode, r.resultData,
r.resultExtras, r.ordered, r.initialSticky, r.userId);
if (ordered) {
r.state = BroadcastRecord.CALL_DONE_RECEIVE;
}
} catch (RemoteException e) {
Slog.w(TAG, "Failure sending broadcast " + r.intent, e);
if (ordered) {
r.receiver = null;
r.curFilter = null;
filter.receiverList.curBroadcast = null;
if (filter.receiverList.app != null) {
filter.receiverList.app.curReceiver = null;
}
}
}
}
}14 performReceiveLocked
利用 Bind 遠端呼叫ApplicationThread 的scheduleRegisteredReceiver 方法
private static void performReceiveLocked(ProcessRecord app, IIntentReceiver receiver,
Intent intent, int resultCode, String data, Bundle extras,
boolean ordered, boolean sticky, int sendingUser) throws RemoteException {
// Send the intent to the receiver asynchronously using one-way binder calls.
if (app != null) {
if (app.thread != null) {
// If we have an app thread, do the call through that so it is
// correctly ordered with other one-way calls.
app.thread.scheduleRegisteredReceiver(receiver, intent, resultCode,
data, extras, ordered, sticky, sendingUser, app.repProcState);
} else {
// Application has died. Receiver doesn't exist.
throw new RemoteException("app.thread must not be null");
}
} else {
receiver.performReceive(intent, resultCode, data, extras, ordered,
sticky, sendingUser);
}
}15 . ApplicationThread .scheduleRegisteredReceiver
public void scheduleRegisteredReceiver(IIntentReceiver receiver, Intent intent,
int resultCode, String dataStr, Bundle extras, boolean ordered,
boolean sticky, int sendingUser, int processState) throws RemoteException {
updateProcessState(processState, false);
receiver.performReceive(intent, resultCode, dataStr, extras, ordered,
sticky, sendingUser);
}16 IIntentReceiver performReceive
IIntentReceiver 是在 LoadAp.ReceiverDispatcher.ReceiverDispatcher內的 類 .
- 生成 Args 物件 ，Args 繼承 BroadcastReceiver.PendingResult 實現 Runable
- ActivityThread.post Args 執行 run 方法
public void performReceive(Intent intent, int resultCode, String data,
Bundle extras, boolean ordered, boolean sticky, int sendingUser) {
if (ActivityThread.DEBUG_BROADCAST) {
int seq = intent.getIntExtra("seq", -1);
Slog.i(ActivityThread.TAG, "Enqueueing broadcast " + intent.getAction() + " seq=" + seq
+ " to " + mReceiver);
}
Args args = new Args(intent, resultCode, data, extras, ordered,
sticky, sendingUser);
if (!mActivityThread.post(args)) {
if (mRegistered && ordered) {
IActivityManager mgr = ActivityManagerNative.getDefault();
if (ActivityThread.DEBUG_BROADCAST) Slog.i(ActivityThread.TAG,
"Finishing sync broadcast to " + mReceiver);
args.sendFinished(mgr);
}
}
}17 Args run方法
其核心程式碼就是 執行 BroadcastReceiver 的 onReceive方法
。。。。。。
try {
ClassLoader cl = mReceiver.getClass().getClassLoader();
intent.setExtrasClassLoader(cl);
setExtrasClassLoader(cl);
receiver.setPendingResult(this);
receiver.onReceive(mContext, intent);
} catch (Exception e) {
if (mRegistered && ordered) {
if (ActivityThread.DEBUG_BROADCAST) Slog.i(ActivityThread.TAG,
"Finishing failed broadcast to " + mReceiver);
sendFinished(mgr);
}
if (mInstrumentation == null ||
!mInstrumentation.onException(mReceiver, e)) {
Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
throw new RuntimeException(
"Error receiving broadcast " + intent
+ " in " + mReceiver, e);
}
}
。。。。。。