Android開發(fā)工具類
2018-07-20 來源：open-open
public final class SystemTool {
/**
* 指定格式返回當前系統(tǒng)時間
*/
public static String getDataTime(String format) {
SimpleDateFormat df = new SimpleDateFormat(format);
return df.format(new Date());
}
/**
* 返回當前系統(tǒng)時間(格式以HH:mm形式)
*/
public static String getDataTime() {
return getDataTime("HH:mm");
}
/**
* 獲取手機IMEI碼
*/
public static String getPhoneIMEI(Context cxt) {
TelephonyManager tm = (TelephonyManager) cxt.getSystemService(Context.TELEPHONY_SERVICE);
return tm.getDeviceId();
}
/**
* 獲取手機系統(tǒng)SDK版本
*
* @return 如API 17 則返回 17
*/
public static int getSDKVersion() {
return android.os.Build.VERSION.SDK_INT;
}
/**
* 獲取系統(tǒng)版本
*
* @return 形如2.3.3
*/
public static String getSystemVersion() {
return android.os.Build.VERSION.RELEASE;
}
/**
* 調用系統(tǒng)發(fā)送短信
*/
public static void sendSMS(Context cxt, String smsBody) {
Uri smsToUri = Uri.parse("smsto:");
Intent intent = new Intent(Intent.ACTION_SENDTO, smsToUri);
intent.putExtra("sms_body", smsBody);
cxt.startActivity(intent);
}
/**
* 判斷網(wǎng)絡是否連接
*/
public static boolean checkNet(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
return info != null;// 網(wǎng)絡是否連接
}
/**
* 判斷是否為wifi聯(lián)網(wǎng)
*/
public static boolean isWiFi(Context cxt) {
ConnectivityManager cm = (ConnectivityManager) cxt.getSystemService(Context.CONNECTIVITY_SERVICE);
// wifi的狀態(tài)：ConnectivityManager.TYPE_WIFI
// 3G的狀態(tài)：ConnectivityManager.TYPE_MOBILE
State state = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
return State.CONNECTED == state;
}
/**
* 隱藏系統(tǒng)鍵盤 <br>
* <b>警告</b> 必須是確定鍵盤顯示時才能調用
*/
public static void hideKeyBoard(Activity aty) {
((InputMethodManager) aty.getSystemService(Context.INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(aty.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
}
/**
* 判斷當前應用程序是否后臺運行
*/
public static boolean isBackground(Context context) {
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
if (appProcess.processName.equals(context.getPackageName())) {
if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
// 后臺運行
return true;
} else {
// 前臺運行
return false;
}
}
}
return false;
}
/**
* 判斷手機是否處理睡眠
*/
public static boolean isSleeping(Context context) {
KeyguardManager kgMgr = (KeyguardManager) context.getSystemService(Context.KEYGUARD_SERVICE);
boolean isSleeping = kgMgr.inKeyguardRestrictedInputMode();
return isSleeping;
}
/**
* 安裝apk
*
* @param context
* @param file
*/
public static void installApk(Context context, File file) {
Intent intent = new Intent();
intent.setAction("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setType("application/vnd.android.package-archive");
intent.setData(Uri.fromFile(file));
intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
/**
* 獲取當前應用程序的版本號
*/
public static String getAppVersion(Context context) {
String version = "0";
try {
version = context.getPackageManager().getPackageInfo(context.getPackageName(), 0).versionName;
} catch (PackageManager.NameNotFoundException e) {
throw new KJException(SystemTool.class.getName() + "the application not found");
}
return version;
}
/**
* 回到home，后臺運行
*/
public static void goHome(Context context) {
Intent mHomeIntent = new Intent(Intent.ACTION_MAIN);
mHomeIntent.addCategory(Intent.CATEGORY_HOME);
mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
context.startActivity(mHomeIntent);
}
/**
* 獲取應用簽名
*
* @param context
* @param pkgName
*/
public static String getSign(Context context, String pkgName) {
try {
PackageInfo pis = context.getPackageManager().getPackageInfo(pkgName, PackageManager.GET_SIGNATURES);
return hexdigest(pis.signatures[0].toByteArray());
} catch (NameNotFoundException e) {
throw new KJException(SystemTool.class.getName() + "the " + pkgName + "'s application not found");
}
}
/**
* 將簽名字符串轉換成需要的32位簽名
*/
private static String hexdigest(byte[] paramArrayOfByte) {
final char[] hexDigits = { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 97, 98, 99, 100, 101, 102 };
try {
MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");
localMessageDigest.update(paramArrayOfByte);
byte[] arrayOfByte = localMessageDigest.digest();
char[] arrayOfChar = new char[32];
for (int i = 0, j = 0;; i++, j++) {
if (i >= 16) { return new String(arrayOfChar); }
int k = arrayOfByte[i];
arrayOfChar[j] = hexDigits[(0xF & k >>> 4)];
arrayOfChar[++j] = hexDigits[(k & 0xF)];
}
} catch (Exception e) {}
return "";
}
/**
* 獲取設備的可用內存大小
*
* @param cxt
* 應用上下文對象context
* @return 當前內存大小
*/
public static int getDeviceUsableMemory(Context cxt) {
ActivityManager am = (ActivityManager) cxt.getSystemService(Context.ACTIVITY_SERVICE);
MemoryInfo mi = new MemoryInfo();
am.getMemoryInfo(mi);
// 返回當前系統(tǒng)的可用內存
return (int) (mi.availMem / (1024 * 1024));
}
/**
* 清理后臺進程與服務
*
* @param cxt
* 應用上下文對象context
* @return 被清理的數(shù)量
*/
public static int gc(Context cxt) {
long i = getDeviceUsableMemory(cxt);
int count = 0; // 清理掉的進程數(shù)
ActivityManager am = (ActivityManager) cxt.getSystemService(Context.ACTIVITY_SERVICE);
// 獲取正在運行的service列表
List<RunningServiceInfo> serviceList = am.getRunningServices(100);
if (serviceList != null) for (RunningServiceInfo service : serviceList) {
if (service.pid == android.os.Process.myPid()) continue;
try {
android.os.Process.killProcess(service.pid);
count++;
} catch (Exception e) {
e.getStackTrace();
continue;
}
}
// 獲取正在運行的進程列表
List<RunningAppProcessInfo> processList = am.getRunningAppProcesses();
if (processList != null) for (RunningAppProcessInfo process : processList) {
// 一般數(shù)值大于RunningAppProcessInfo.IMPORTANCE_SERVICE的進程都長時間沒用或者空進程了
// 一般數(shù)值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE的進程都是非可見進程，也就是在后臺運行著
if (process.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) {
// pkgList 得到該進程下運行的包名
String[] pkgList = process.pkgList;
for (String pkgName : pkgList) {
try {
am.killBackgroundProcesses(pkgName);
count++;
} catch (Exception e) { // 防止意外發(fā)生
e.getStackTrace();
continue;
}
}
}
}
//"清理了" + (getDeviceUsableMemory(cxt) - i) + "M內存";
return count;
}
}
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