一. 筆記5 ~ 筆記9內(nèi)容:
- 虛擬地址與物理地址;
- IPC通信方式:管道,套接字,內(nèi)存共享,信號(hào),binder驅(qū)動(dòng);
- binder驅(qū)動(dòng):binder_open(), binder_mmap(), binder_ioctl;
- 通信過程:
服務(wù)進(jìn)程啟動(dòng)后進(jìn)入等待;
客戶端發(fā)起調(diào)用;
服務(wù)進(jìn)程被喚醒;
客戶端進(jìn)入等待;
服務(wù)進(jìn)程響應(yīng)調(diào)用并執(zhí)行;
服務(wù)處理返回;
客戶端被喚醒;
二. 應(yīng)用向AMS發(fā)起請(qǐng)求過程分析:
Instrumentation類中execStartActivity()方法:
public ActivityResult execStartActivity(
Context who, IBinder contextThread, IBinder token, Activity target,
Intent intent, int requestCode, Bundle options) {
IApplicationThread whoThread = (IApplicationThread) contextThread;
if (mActivityMonitors != null) {
// ...
}
try {
intent.migrateExtraStreamToClipData();
intent.prepareToLeaveProcess();
int result = ActivityManagerNative.getDefault()
.startActivity(whoThread, who.getBasePackageName(), intent,
intent.resolveTypeIfNeeded(who.getContentResolver()),
token, target != null ? target.mEmbeddedID : null,
requestCode, 0, null, options);
checkStartActivityResult(result, intent);
} catch (RemoteException e) {
}
return null;
}
2.1 ActivityManagerNative.getDefault():向ServiceManager進(jìn)程查詢返回 AMS的Binder對(duì)象的handle值,最終返回的是BpBinder(handle);

查找AMS.png