1、staticfinalStringLOG_TAG=RecentApplicationsDialog;4.booleanDBG_FORCE_EMPTY_LISTfalse;5.6.StatusBarManagersStatusBar;7.8.intNUM_BUTTONS8;9.MAX_RECENT_TASKS*2;allowsomediscards10.11.TextViewmIconsnewTextViewNUM_BUTTONS;12.ViewmNoAppsText;13.IntentFiltermBroadcastIntentFilterIntentFilter（Intent.ACTION_
2、CLOSE_SYSTEM_DIALOGS）;14.15.RecentTag16.ActivityManager.RecentTaskInfoinfo;17.Intentintent;18.19.20.HandlermHandlerHandler（）;21.RunnablemCleanupRunnable（）22.publicvoidrun（）23.dumpextramemorywerehangingonto24.（TextViewicon:mIcons）25.icon.setCompoundDrawables（null,null,null）;26.icon.setTag（null）;27.28
3、.29.;30.31.RecentApplicationsDialog（Contextcontext）32.super（context,.android.internal.R.style.Theme_Dialog_RecentApplications）;33.34.35.36./*37.Wecreatetherecentapplicationsdialogjustonce,anditstaysaround（hidden）38.untilactivatedbyuser.39.40.seePhoneWindowManager#showRecentAppsDialog41.*/42.Override
4、43.protectedonCreate（BundlesavedInstanceState）44.super.onCreate（savedInstanceState）;45.46.ContextcontextgetContext（）;47.48.if（sStatusBar=null）49.sStatusBar（StatusBarManager）context.getSystemService（Context.STATUS_BAR_SERVICE）;50.51.52.WindowwindowgetWindow（）;53.window.requestFeature（Window.FEATURE_N
5、O_TITLE）;54.window.setType（WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG）;55.window.setFlags（WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,56.WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM）;57.window.setTitle（Recents）;58.59.setContentView（.android.internal.R.layout.recent_apps_dialog）;60.61.Win
6、dowManager.LayoutParamsparamswindow.getAttributes（）;62.params.widthWindowManager.LayoutParams.MATCH_PARENT;63.params.height64.window.setAttributes（params）;65.window.setFlags（0,WindowManager.LayoutParams.FLAG_DIM_BEHIND）;66.67./默认显示8个68.mIcons0（TextView）findViewById（.android.internal.R.id.button0）;69
7、.mIcons1（TextView）findViewById（.android.internal.R.id.button1）;70.mIcons2（TextView）findViewById（.android.internal.R.id.button2）;71.mIcons3（TextView）findViewById（.android.internal.R.id.button3）;72.mIcons4（TextView）findViewById（.android.internal.R.id.button4）;73.mIcons5（TextView）findViewById（.android.
8、internal.R.id.button5）;74.mIcons6（TextView）findViewById（.android.internal.R.id.button6）;75.mIcons7（TextView）findViewById（.android.internal.R.id.button7）;76.mNoAppsTextfindViewById（.android.internal.R.id.no_applications_message）;77.78./关键在哪，你懂得.79.b:80.b.setOnClickListener（this）;81.82.83.84.85.onKeyD
9、own（intkeyCode,KeyEventevent）86.（keyCodeKeyEvent.KEYCODE_TAB）87.IgnoreallmetakeysotherthanSHIFT.Theappswitchkeycouldbea88.fallbackactionchordedwithALT,METAorevenCTRLdependingmap.89.DPadnavigationishandledViewRootelsewhere.90.backwardevent.isShiftPressed（）;91.numIconsmIcons.length;92.numButtons0;93.while（numButtons&mIconsnumButtons.getVisibility（）View.VISIBLE）94.+=1;95.96.!0）97.nextFocus?-1:98.（in
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