2011-9-27 22:05:52
Step 4. Instrumentation.execStartActivity
這個函數定義在frameworks/base/core/java/android/app/Instrumentation.java文件中:
public class Instrumentation {
......
public ActivityResult execStartActivity(
Context who, IBinder contextThread, IBinder token, Activity target,
Intent intent, int requestCode) {
IApplicationThread whoThread = (IApplicationThread) contextThread;
if (mActivityMonitors != null) {
......
}
try {
int result = ActivityManagerNative.getDefault()
.startActivity(whoThread, intent,
intent.resolveTypeIfNeeded(who.getContentResolver()),
null, 0, token, target != null ? target.mEmbeddedID : null,
requestCode, false, false);
......
} catch (RemoteException e) {
}
return null;
}
......
} 這裏的ActivityManagerNative.getDefault返回ActivityManagerService的遠程接口,即ActivityManagerProxy接口,
具體可以參考Android系統在新進程中啓動自定義服務過程(startService)的原理分析一文。
這裏的intent.resolveTypeIfNeeded返回這個intent的MIME類型,在這個例子中,沒有AndroidManifest.xml設置MainActivity的MIME類型,因此,這裏返回null。
這裏的target不爲null,但是target.mEmbddedID爲null,我們不用關注。