android內存讀取
⑴ android 怎麼獲取手機內存里的音樂信息
Android自帶的音樂播放器中，在獲取音樂文件信息的時候是通過掃描得到相關信息的。掃描時使用掃描器MediaScanner完成。
Android系統提供了MediaScanner、MediaProvider、MediaStore等介面，並且提供了一套資料庫表格，通過Content Provider的方式提供給用戶。當手機開機或者有SD卡插拔等事件發生時，系統將會自動掃描SD卡和手機內存上的媒體文件，如audio、video、圖片等，將相應的信息放到定義好的資料庫表格中。在這個程序中，我們不需要關心如何去掃描手機中的文件，只要了解如何查詢和使用這些信息就可以了。
MediaStore中定義了一系列的數據表格，通過Android ContentResolver提供的查詢介面，我們可以得到各種需要的信息。下面我們重點介紹查詢SD卡上的音樂文件信息。
先來了解一下ContentResolver的查詢介面：
Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)
Uri：指明要查詢的資料庫名稱加上表的名稱，從MediaStore中我們可以找到相應信息的參數。
Projection: 指定查詢資料庫表中的哪幾列，返回的游標中將包括相應的信息。Null則返回所有信息。
selection: 指定查詢條件
selectionArgs：參數selection里有 ？這個符號是，這里可以以實際值代替這個問號。如果selection這個沒有？的話，那麼這個String數組可以為null。
SortOrder：指定查詢結果的排列順序
下面的命令將返回所有在外部存儲卡上的音樂文件的信息：
Cursor cursor = query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
得到cursor後，我們可以調用Cursor的相關方法具體的音樂信息：
歌曲ID：MediaStore.Audio.Media._ID
Int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));
歌曲的名稱：MediaStore.Audio.Media.TITLE
String tilte = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));
歌曲的專輯名：MediaStore.Audio.Media.ALBUM
String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));
歌曲的歌手名：MediaStore.Audio.Media.ARTIST
String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));
歌曲文件的路徑：MediaStore.Audio.Media.DATA
String url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
歌曲的總播放時長：MediaStore.Audio.Media.DURATION
Int ration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));
歌曲文件的大小：MediaStore.Audio.Media.SIZE
Int size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));
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榪欎釜鏂規硶鏈夊緢澶氾紝甯哥敤鐨勬槸 adb shell mpsys meminfo <package_name> 榪欏彲浠ョ湅鍒版瘮杈冨叏闈㈢殑淇℃伅,鐢變簬Android鏄鏈夊唴瀛樺叡浜鐨勶紝鎵浠ラ氬父鏈 VSS錛孯SS錛孭SS錛孶SS絳変笉鍚岀殑鍐呭瓨琛ㄨ堪錛屾瘮杈冨父鐢ㄧ殑鏄疨SS錛屼細灝嗗叡浜搴撴寜鐓ф瘮渚嬪垎閰嶇粰褰撳墠鍐呭瓨
⑶ Android獲取系統cpu信息，內存，版本，電量等信息
1、CPU頻率，CPU信息：/proc/cpuinfo和/proc/stat
通過讀取文件/proc/cpuinfo系統CPU的類型等多種信息。
讀取/proc/stat 所有CPU活動的信息來計算CPU使用率
下面我們就來講講如何通過代碼來獲取CPU頻率：
復制代碼 代碼如下:
package com.orange.cpu;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
public class CpuManager {
// 獲取CPU最大頻率（單位KHZ）
// "/system/bin/cat" 命令行
// "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" 存儲最大頻率的文件的.路徑
public static String getMaxCpuFreq() {
String result = "";
ProcessBuilder cmd;
try {
String[] args = { "/system/bin/cat",
"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq" };
cmd = new ProcessBuilder(args);
Process process = cmd.start();
InputStream in = process.getInputStream();
byte[] re = new byte[24];
while (in.read(re) != -1) {
result = result + new String(re);
}
in.close();
} catch (IOException ex) {
ex.printStackTrace();
result = "N/A";
}
return result.trim();
}
// 獲取CPU最小頻率（單位KHZ）
public static String getMinCpuFreq() {
String result = "";
ProcessBuilder cmd;
try {
String[] args = { "/system/bin/cat",
"/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq" };
cmd = new ProcessBuilder(args);
Process process = cmd.start();
InputStream in = process.getInputStream();
byte[] re = new byte[24];
while (in.read(re) != -1) {
result = result + new String(re);
}
in.close();
} catch (IOException ex) {
ex.printStackTrace();
result = "N/A";
}
return result.trim();
}
// 實時獲取CPU當前頻率（單位KHZ）
public static String getCurCpuFreq() {
String result = "N/A";
try {
FileReader fr = new FileReader(
"/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq");
BufferedReader br = new BufferedReader(fr);
String text = br.readLine();
result = text.trim();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
// 獲取CPU名字
public static String getCpuName() {
try {
FileReader fr = new FileReader("/proc/cpuinfo");
BufferedReader br = new BufferedReader(fr);
String text = br.readLine();
String[] array = text.split(":s+", 2);
for (int i = 0; i < array.length; i++) {
}
return array[1];
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
2、內存：/proc/meminfo
復制代碼 代碼如下:
public void getTotalMemory() {
String str1 = "/proc/meminfo";
String str2="";
try {
FileReader fr = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
while ((str2 = localBufferedReader.readLine()) != null) {
Log.i(TAG, "---" + str2);
}
} catch (IOException e) {
}
}
3、Rom大小
復制代碼 代碼如下:
public long[] getRomMemroy() {
long[] romInfo = new long[2];
//Total rom memory
romInfo[0] = getTotalInternalMemorySize();
//Available rom memory
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
romInfo[1] = blockSize * availableBlocks;
getVersion();
return romInfo;
}
public long getTotalInternalMemorySize() {
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
return totalBlocks * blockSize;
}
4、sdCard大小
復制代碼 代碼如下:
public long[] getSDCardMemory() {
long[] sdCardInfo=new long[2];
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
File sdcardDir = Environment.getExternalStorageDirectory();
StatFs sf = new StatFs(sdcardDir.getPath());
long bSize = sf.getBlockSize();
long bCount = sf.getBlockCount();
long availBlocks = sf.getAvailableBlocks();
sdCardInfo[0] = bSize * bCount;//總大小
sdCardInfo[1] = bSize * availBlocks;//可用大小
}
return sdCardInfo;
}
5、電池電量
復制代碼 代碼如下:
private BroadcastReceiver batteryReceiver=new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
int level = intent.getIntExtra("level", 0);
// level加%就是當前電量了
}
};
registerReceiver(batteryReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
6、系統的版本信息
復制代碼 代碼如下:
public String[] getVersion(){
String[] version={"null","null","null","null"};
String str1 = "/proc/version";
String str2;
String[] arrayOfString;
try {
FileReader localFileReader = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(
localFileReader, 8192);
str2 = localBufferedReader.readLine();
arrayOfString = str2.split("s+");
version[0]=arrayOfString[2];//KernelVersion
localBufferedReader.close();
} catch (IOException e) {
}
version[1] = Build.VERSION.RELEASE;// firmware version
version[2]=Build.MODEL;//model
version[3]=Build.DISPLAY;//system version
return version;
}
7、mac地址和開機時間
復制代碼 代碼如下:
public String[] getOtherInfo(){
String[] other={"null","null"};
WifiManager wifiManager = (WifiManager) mContext.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
if(wifiInfo.getMacAddress()!=null){
other[0]=wifiInfo.getMacAddress();
} else {
other[0] = "Fail";
}
other[1] = getTimes();
return other;
}
private String getTimes() {
long ut = SystemClock.elapsedRealtime() / 1000;
if (ut == 0) {
ut = 1;
}
int m = (int) ((ut / 60) % 60);
int h = (int) ((ut / 3600));
return h + " " + mContext.getString(R.string.info_times_hour) + m + " "
+ mContext.getString(R.string.info_times_minute);
}
⑷ Android鑾峰彇搴旂敤鍐呭瓨浣跨敤鎯呭喌鐨勬柟娉
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getMemoryClass(); System銆俹ut銆俻rintln("memory: "+memory); //鏈澶у垎閰嶅唴瀛樿幏鍙栨柟娉2 float maxMemory = (float) (Runtime銆倈etRuntime()銆俶axMemory() * 1銆
0/ (1024 * 1024)); //褰撳墠鍒嗛厤鐨勬誨唴瀛 float totalMemory = (float) (Runtime銆倈etRuntime()銆倀otalMemory() * 1銆0/ (1024 * 1024)); //鍓╀綑鍐呭瓨 float freeMemory = (float) (Runtime銆
getRuntime()銆俧reeMemory() * 1銆0/ (1024 * 1024)); System銆俹ut銆俻rintln("maxMemory: "+maxMemory); System銆俹ut銆俻rintln("totalMemory: "+totalMemory); System銆
out銆俻rintln("freeMemory: "+freeMemory);緇撴灉System銆俹ut: memory: 256System銆俹ut: maxMemory: 256銆0System銆俹ut: totalMemory: 11銆974937System銆
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⑸ 如何獲取android系統總的內存容量
在設置-存儲那裡就可以看到了，會顯示存儲設置的SD卡和內部存儲空間的容量，要是運存的話可以看看設置-關於手機那裡