Android開(kāi)發(fā)技術(shù) - - 系統(tǒng)資源監(jiān)視

獲取電量信息/**

*廣播監(jiān)聽(tīng)電量變化

*/

classBatteryReceiverextendsBroadcastReceiver{

//判斷它是否是為電量變化的BroadcastAction

@Override

publicvoidonReceive(Contextcontext,Intentintent){

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

//獲取當(dāng)前電量

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

//電量的總刻度

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

//把它轉(zhuǎn)成百分比

Toast.makeText(context,"電池電量為"+((level*100)/scale)+"%",Toast.LENGTH_LONG).show();

isBatteryOpen=false;

}

}

}獲取電量信息/**

*注冊(cè)廣播得到系統(tǒng)電量的值

*/

privatevoidbatteryState(){

isBatteryOpen=true;

//注冊(cè)receiver

registerReceiver(batteryReceiver,intentFilter);

}batteryReceiver=newBatteryReceiver();

//注冊(cè)廣播接受者監(jiān)聽(tīng)系統(tǒng)電池變化

intentFilter=newIntentFilter(Intent.ACTION_BATTERY_CHANGED);獲取藍(lán)牙信息/**

*判斷藍(lán)牙服務(wù)

*/

privateStringblueToothState(){

StringblueToothState="藍(lán)牙已關(guān)閉";

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

booleanisBlueOpen=mBluetoothAdapter.isEnabled();

if(isBlueOpen){

blueToothState="藍(lán)牙已打開(kāi)";

}else{

blueToothState="藍(lán)牙已關(guān)閉";

}

}

returnblueToothState;

}獲取電話狀態(tài)信息/**

*電話狀態(tài)監(jiān)聽(tīng)器

*/

privateclassMyPhoneStateListenerextendsPhoneStateListener{

/*從得到的信號(hào)強(qiáng)度,每個(gè)tiome供應(yīng)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(),

"當(dāng)前"

+level,

Toast.LENGTH_SHORT).show();

}

isGsmOpen=false;

}

}獲取電話狀態(tài)信息Tel.listen(MyListener,PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);MyListener=newMyPhoneStateListener();獲取網(wǎng)絡(luò)狀態(tài)信息/**

*網(wǎng)絡(luò)變化廣播接收器

*/

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;

}

}

}獲取網(wǎng)絡(luò)狀態(tài)信息/**

*注冊(cè)網(wǎng)絡(luò)變化廣播

*/

privatevoidregisterReceiver(){

IntentFilterfilter=newIntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);

myReceiver=newConnectionChangeReceiver();

this.registerReceiver(myReceiver,filter);

}

/**

*注銷網(wǎng)絡(luò)變化廣播

*/

privatevoidunregisterReceiver(){

this.unregisterReceiver(myReceiver);

}

獲取CPU使用信息/**

*獲取系統(tǒng)總CPU使用時(shí)間

*/

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;

}獲取CPU使用信息/**

*獲取應(yīng)用占用的CPU時(shí)間

*/

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;

}獲取CPU使用信息/**

*獲取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;

}獲取應(yīng)用內(nèi)存使用信息Android為每個(gè)應(yīng)用分配多少內(nèi)存？Android為每個(gè)進(jìn)程分配內(nèi)存時(shí)，采用彈性的分配方式，即剛開(kāi)始并不會(huì)給應(yīng)用分配很多的內(nèi)存，而是給每一個(gè)進(jìn)程分配一個(gè)“夠用”的內(nèi)存大小。分配最大內(nèi)存AndroidManifest.xml中的application標(biāo)簽加上 android:largeHeap=“true“可以獲取到最大分配內(nèi)存NX510J手機(jī)實(shí)測(cè)配置之前，通過(guò)rt.maxMemory();獲取的值為192M。設(shè)置largeHeap為true時(shí)，通過(guò)rt.maxMemory();獲取的值為512M。獲取應(yīng)用內(nèi)存使用信息/**

*獲取應(yīng)用內(nèi)存使用信息

*/

privateStringgetMemory(){

ActivityManageractivityManager=(ActivityManager)getSystemService(ACTIVITY_SERVICE);

//最大分配內(nèi)存

intmemory=activityManager.getMemoryClass();

//最大分配內(nèi)存獲取方法2

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

//當(dāng)前分配的總內(nèi)存

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

//剩余內(nèi)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";

}獲取系統(tǒng)內(nèi)存使用信息/**

*獲取系統(tǒng)內(nèi)存使用信息

*/

privateStringgetMemoryInfo(){

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

ActivityManager.MemoryInfoinfo=newActivityManager.MemoryInfo();

manager.getMemoryInfo(info);

Log.e("Memory","系統(tǒng)總內(nèi)存:"+(info.totalMem/(1024*1024))+"M");

Log.e("Memory","系統(tǒng)剩余內(nèi)存:"+(info.availMem/(1024*1024))+"M");

Log.e("Memory","系統(tǒng)是否處于低內(nèi)存運(yùn)行："+info.lowMemory);

Log.e("Memory","系統(tǒng)剩余內(nèi)存低于"+(info.threshold/(1024*1024))+"M時(shí)為低內(nèi)存運(yùn)行");

return"系統(tǒng)剩余內(nèi)存:"+(info.availMem/(1024*1024))+"M";

}獲取存儲(chǔ)使用信息android.os下的StatFs類主要用來(lái)獲取文件系統(tǒng)的狀態(tài)，能夠獲取sd卡的大小和剩余空間，獲取系統(tǒng)內(nèi)部空間也就是system的大小和剩余空間。StatFs獲取的都是以block為單位的獲取存儲(chǔ)使用信息block的概念：1.硬件上的blocksize,應(yīng)該是“sectorsize”，linux的扇區(qū)大小是512byte

2.有文件系統(tǒng)的分區(qū)的blocksize,是“blocksize”，大小不一，可以用工具查看

3.沒(méi)有文件系統(tǒng)的分區(qū)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.磁盤分區(qū)的“cylindersize”，用fdisk可以查看。一般SD卡都是fat32的文件系統(tǒng)，blocksize是4096.這樣就可以知道手機(jī)的內(nèi)部存儲(chǔ)空間和sd卡存儲(chǔ)空間的總大小和可用大小了獲取SDCard使用信息/**

*獲取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