Android开发技术 - - 系统资源监视

获取电量信息/**

*广播监听电量变化

*/

classBatteryReceiverextendsBroadcastReceiver{

//判断它是否是为电量变化的BroadcastAction

@Override

publicvoidonReceive(Contextcontext,Intentintent){

if(Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())&&isBatteryOpen){

//获取当前电量

intlevel=intent.getIntExtra("level",0);

//电量的总刻度

intscale=intent.getIntExtra("scale",100);

//把它转成百分比

Toast.makeText(context,"电池电量为"+((level*100)/scale)+"%",Toast.LENGTH_LONG).show();

isBatteryOpen=false;

}

}

}获取电量信息/**

*注册广播得到系统电量的值

*/

privatevoidbatteryState(){

isBatteryOpen=true;

//注册receiver

registerReceiver(batteryReceiver,intentFilter);

}batteryReceiver=newBatteryReceiver();

//注册广播接受者监听系统电池变化

intentFilter=newIntentFilter(Intent.ACTION_BATTERY_CHANGED);获取蓝牙信息/**

*判断蓝牙服务

*/

privateStringblueToothState(){

StringblueToothState="蓝牙已关闭";

if(mBluetoothAdapter!=null){ //BluetoothAdapter.getDefaultAdapter();

booleanisBlueOpen=mBluetoothAdapter.isEnabled();

if(isBlueOpen){

blueToothState="蓝牙已打开";

}else{

blueToothState="蓝牙已关闭";

}

}

returnblueToothState;

}获取电话状态信息/**

*电话状态监听器

*/

privateclassMyPhoneStateListenerextendsPhoneStateListener{

/*从得到的信号强度,每个tiome供应商有更新*/

@Override

publicvoidonSignalStrengthsChanged(SignalStrengthsignalStrength){

super.onSignalStrengthsChanged(signalStrength);

Stringlevel;

if(isGsmOpen){

intasu=signalStrength.getGsmSignalStrength();

if(asu<=2||asu==99)level=SIGNAL_STRENGTH_NONE_OR_UNKNOWN;

elseif(asu>=12)level=SIGNAL_STRENGTH_GREAT;

elseif(asu>=8)level=SIGNAL_STRENGTH_GOOD;

elseif(asu>=5)level=SIGNAL_STRENGTH_MODERATE;

elselevel=SIGNAL_STRENGTH_POOR;

Toast.makeText(getApplicationContext(),

"当前"

+level,

Toast.LENGTH_SHORT).show();

}

isGsmOpen=false;

}

}获取电话状态信息Tel.listen(MyListener,PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);MyListener=newMyPhoneStateListener();获取网络状态信息/**

*网络变化广播接收器

*/

publicclassConnectionChangeReceiverextendsBroadcastReceiver{

@Override

publicvoidonReceive(Contextcontext,Intentintent){

ConnectivityManagerconnectivityManager=(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkInfomobNetInfo=connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

NetworkInfowifiNetInfo=connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

if(!mobNetInfo.isConnected()&&!wifiNetInfo.isConnected()){

isConnect=false;

}else{

isConnect=true;

}

}

}获取网络状态信息/**

*注册网络变化广播

*/

privatevoidregisterReceiver(){

IntentFilterfilter=newIntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);

myReceiver=newConnectionChangeReceiver();

this.registerReceiver(myReceiver,filter);

}

/**

*注销网络变化广播

*/

privatevoidunregisterReceiver(){

this.unregisterReceiver(myReceiver);

}

获取CPU使用信息/**

*获取系统总CPU使用时间

*/

publicstaticlonggetTotalCpuTime(){

String[]cpuInfos=null;

try{

BufferedReaderreader=newBufferedReader(newInputStreamReader(

newFileInputStream("/proc/stat")),1000);

Stringload=reader.readLine();

Log.i(TAG,"getTotalCpuTime:"+load);

reader.close();

cpuInfos=load.split("");

}catch(IOExceptionex){

ex.printStackTrace();

}

longtotalCpu=Long.parseLong(cpuInfos[2])

+Long.parseLong(cpuInfos[3])+Long.parseLong(cpuInfos[4])

+Long.parseLong(cpuInfos[6])+Long.parseLong(cpuInfos[5])

+Long.parseLong(cpuInfos[7])+Long.parseLong(cpuInfos[8]);

returntotalCpu;

}获取CPU使用信息/**

*获取应用占用的CPU时间

*/

publicstaticlonggetAppCpuTime(){

String[]cpuInfos=null;

try{

intpid=android.os.Process.myPid();

BufferedReaderreader=newBufferedReader(newInputStreamReader(

newFileInputStream("/proc/"+pid+"/stat")),1000);

Stringload=reader.readLine();

Log.i(TAG,"getAppCpuTime:"+load);

reader.close();

cpuInfos=load.split("");

}catch(IOExceptionex){

ex.printStackTrace();

}

longappCpuTime=Long.parseLong(cpuInfos[13])

+Long.parseLong(cpuInfos[14])+Long.parseLong(cpuInfos[15])

+Long.parseLong(cpuInfos[16]);

returnappCpuTime;

}获取CPU使用信息/**

*获取CPU使用率

*/

privatedoublegetProcessCpuRate(){

floattotalCpuTime1=getTotalCpuTime();

floatprocessCpuTime1=getAppCpuTime();

try{

Thread.sleep(360);

}catch(Exceptione){

e.printStackTrace();

}

floattotalCpuTime2=getTotalCpuTime();

floatprocessCpuTime2=getAppCpuTime();

floatcpuRate=100*(processCpuTime2-processCpuTime1)

/(totalCpuTime2-totalCpuTime1);

returncpuRate;

}获取应用内存使用信息Android为每个应用分配多少内存？Android为每个进程分配内存时，采用弹性的分配方式，即刚开始并不会给应用分配很多的内存，而是给每一个进程分配一个“够用”的内存大小。分配最大内存AndroidManifest.xml中的application标签加上 android:largeHeap=“true“可以获取到最大分配内存NX510J手机实测配置之前，通过rt.maxMemory();获取的值为192M。设置largeHeap为true时，通过rt.maxMemory();获取的值为512M。获取应用内存使用信息/**

*获取应用内存使用信息

*/

privateStringgetMemory(){

ActivityManageractivityManager=(ActivityManager)getSystemService(ACTIVITY_SERVICE);

//最大分配内存

intmemory=activityManager.getMemoryClass();

//最大分配内存获取方法2

floatmaxMemory=(float)(Runtime.getRuntime().maxMemory()*1.0/(1024*1024));

//当前分配的总内存

floattotalMemory=(float)(Runtime.getRuntime().totalMemory()*1.0/(1024*1024));

//剩余内存

floatfreeMemory=(float)(Runtime.getRuntime().freeMemory()*1.0/(1024*1024));

System.out.println("maxMemory:"+maxMemory);

System.out.println("totalMemory:"+totalMemory);

System.out.println("freeMemory:"+freeMemory);

return"maxMemory:"+maxMemory+"M;totalMemory:"+totalMemory+"M;freeMemory:"+freeMemory+"M";

}获取系统内存使用信息/**

*获取系统内存使用信息

*/

privateStringgetMemoryInfo(){

ActivityManagermanager=(ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);

ActivityManager.MemoryInfoinfo=newActivityManager.MemoryInfo();

manager.getMemoryInfo(info);

Log.e("Memory","系统总内存:"+(info.totalMem/(1024*1024))+"M");

Log.e("Memory","系统剩余内存:"+(info.availMem/(1024*1024))+"M");

Log.e("Memory","系统是否处于低内存运行："+info.lowMemory);

Log.e("Memory","系统剩余内存低于"+(info.threshold/(1024*1024))+"M时为低内存运行");

return"系统剩余内存:"+(info.availMem/(1024*1024))+"M";

}获取存储使用信息android.os下的StatFs类主要用来获取文件系统的状态，能够获取sd卡的大小和剩余空间，获取系统内部空间也就是system的大小和剩余空间。StatFs获取的都是以block为单位的获取存储使用信息block的概念：1.硬件上的blocksize,应该是“sectorsize”，linux的扇区大小是512byte

2.有文件系统的分区的blocksize,是“blocksize”，大小不一，可以用工具查看

3.没有文件系统的分区的blocksize，也叫“blocksize”，大小指的是1024byte

4.Kernelbuffercache的blocksize,就是“blocksize”，大部分PC是1024byte

5.磁盘分区的“cylindersize”，用fdisk可以查看。一般SD卡都是fat32的文件系统，blocksize是4096.这样就可以知道手机的内部存储空间和sd卡存储空间的总大小和可用大小了获取SDCard使用信息/**

*获取SDCard使用信息

*/

StringreadSDCard(){

Stringstate=Environment.getExternalStorageState();

if(Environment.MEDIA_MOUNTED.equals(state)){

FilesdcardDir=Environment.getExternalStorageDirectory();

StatFssf=newStatFs(sdcardDir.getPath());

longblockSize=sf.getBlockSize();

longblockCount=sf.getBlockCount();

longavail