a).Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED) //sd卡挂载状态
b).Environment.getExternalStorageDirectory().getPath() //sd卡路径 ->/storage/emulated/0
c).Environment.getDownloadCacheDirectory().getPath() //data/cache路径
d).Environment.getDataDirectory().getPath() //data

<uses-permission android:name=“android.permission.WRITE_EXTERNAL_STORAGE”/>
<uses-permission android:name=“android.permission.MOUNT_UNMOUNT_FILESYSTEMS”/>

//隐式广播需要在manifest中加上
>>class Receiver:BroadcastReceiver{。 //自定义监听器
onReceive(context:Context?,intent:Intent?){
val action=intent.getAction()
when(action)->{
}
}
}
>>IntentFilter if=IntentFilter() //动态注册广播
if.addAction("action1")
registerReceiver(re:BroadcastReceiver,if)
override fun destroy(){
unregisterReceiver(re:BroadcastReceiver)
}
>>隐式广播(通过action和category匹配)
:1.在Manifest上添加<category android:name="android.intent.category.DEFAULT"/>
:2.标识为android.intent.category.LAUNCHER，则不用添加DEFAULT
>>sendBroadcast(intent) //发送普通广播,静态注册必须描述action标签
:1.val intent=Intent()
intent.action=""intent.addCategory()
>>sendOrderedBroadcast(intent,receivePermission) //发送有序广播
a).<receiver android:name=".smsReceiver">
<intent-filter android:priority="1000">
<action android:name="android.provider.Telephony.SMS_RECEIVED"/>
</intent-filter>
</receiver>
b).setResultExtras(bundle:Bundle) //后续广播通过getResultExtras(true)取回Bundle
c).abortBroadcast() //终止广播传递
>>sendStickyBroadcast(intent) //发送粘性广播,粘性广播以最后一次的内容进行保留
:1.removeStickyBroadcast(intent)
:2.在Manifest中声明android.permission.BROADCAST_STICKY

//结合ActivityThread
->onCreate 创建时执行
a).mInstrumentation.callActivityOnCreate
b).performStart
c).mInstrumentation.callActivityOnRestoreInstanceState
->onStart 可见时执行
->onResume 获取焦点时执行
a).handleResumeActivity
>performResumeActivity
->onPause 失去焦点时执行
a).handlePauseActivity
>performPauseActivity
>if(!r.activity.mFinished&&r.saveState)
mInstrumentation.callActivityOnSaveInstanceState
->onStop 不可见时执行
a).handleStopActivity
>performStopActivityInner
>performPauseActivityIfNeeded
->onDestroy 销毁
a).handleDestroyActivity
->案例分析:Activity A -> Activity B
:1.Activity A的创建，A::onCreate , A:onStart ,A:onResume
:2.跳转 , A:onPause ,B::onCreate,B:onStart,B:onResume,A:onStop
:3.Activity B返回,B:onPause,A:onRestart,A:onStart,A:onResume,B:onStop,B:onDestroy

android:theme=“@android:style/Theme.Dialog”

>>//示例
a).public class LocalService extends Service{
private static LBinder binder=new LBinder(); //必须声明为static
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
@Override
public IBinder onBind(Intent intent)
{
return binder;
}
static class LBinder extends Binder{
public int getCount(){
return count;
}
}
}

>>onCreate //创建单独的HandlerThread处理所有的intent请求
:1.HandlertThread thread = new HandlerThread("")
thread.start()
mServiceLooper =thread.getLooper()
mServiceHandler =new ServiceHandler(mServiceLooper)

:1.public int onStartCommand(Intent intent,int startId){
onStart(intent,startId)
return mRedelivery?START_REDELIVER_INTENT:START_NOT_STICKY;//在于service挂掉了intent是否会回
传
}
:2.public void onStart(Intent intent,int startId)
{
Message msg=mServiceHandler.obtainMessage()
msg.obj=intent
msg.arg1=startId
mServiceHandler.sendMessage(msg)
}

//onHandleIntent,为自定义的类所实现的耗时操作
:1.private final class ServiceHandler extends Handler{
public ServiceHandler(Looper looper){super(looper);}
public void handleMessage(Message msg)
{
onHandleIntent((Intent)msg.obj)
stopSelf(msg.arg1)//当id为最后一个startService的startId时，进行关闭
}
}

>>override fun onCreateOptionsMenu(menu:Menu)
{
getMenuInflater.inflate(R.menu.menu1,menu)
return super.onCreateOptionsMenu(menu)
}
>>setHasOptionsMenu(true) //Fragment onCreate