Android 通过应用设置系统日期和时间的方法

Android 通过应用设置系统日期和时间的方法

android 2.3

android 4.0

测试可行,不过需要ROOT权限.

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import java.io.DataOutputStream; import java.io.File; import java.io.IOException; import java.util.Calendar;   import android.os.SystemClock;   public class SystemDateTime {           static final String TAG = "SystemDateTime";           public static void setDateTime(int year, int month, int day, int hour, int minute) throws IOException, InterruptedException {           requestPermission();           Calendar c = Calendar.getInstance();           c.set(Calendar.YEAR, year);         c.set(Calendar.MONTH, month-1);         c.set(Calendar.DAY_OF_MONTH, day);         c.set(Calendar.HOUR_OF_DAY, hour);         c.set(Calendar.MINUTE, minute);                             long when = c.getTimeInMillis();           if (when / 1000 < Integer.MAX_VALUE) {             SystemClock.setCurrentTimeMillis(when);         }           long now = Calendar.getInstance().getTimeInMillis();         //Log.d(TAG, "set tm="+when + ", now tm="+now);           if(now - when > 1000)             throw new IOException("failed to set Date.");               }       public static void setDate(int year, int month, int day) throws IOException, InterruptedException {           requestPermission();           Calendar c = Calendar.getInstance();           c.set(Calendar.YEAR, year);         c.set(Calendar.MONTH, month);         c.set(Calendar.DAY_OF_MONTH, day);         long when = c.getTimeInMillis();           if (when / 1000 < Integer.MAX_VALUE) {             SystemClock.setCurrentTimeMillis(when);         }           long now = Calendar.getInstance().getTimeInMillis();         //Log.d(TAG, "set tm="+when + ", now tm="+now);           if(now - when > 1000)             throw new IOException("failed to set Date.");     }       public static void setTime(int hour, int minute) throws IOException, InterruptedException {                   requestPermission();           Calendar c = Calendar.getInstance();           c.set(Calendar.HOUR_OF_DAY, hour);         c.set(Calendar.MINUTE, minute);         long when = c.getTimeInMillis();           if (when / 1000 < Integer.MAX_VALUE) {             SystemClock.setCurrentTimeMillis(when);         }           long now = Calendar.getInstance().getTimeInMillis();         //Log.d(TAG, "set tm="+when + ", now tm="+now);           if(now - when > 1000)             throw new IOException("failed to set Time.");     }           static void requestPermission() throws InterruptedException, IOException {         createSuProcess("chmod 666 /dev/alarm").waitFor();     }           static Process createSuProcess() throws IOException  {         File rootUser = new File("/system/xbin/ru");         if(rootUser.exists()) {             return Runtime.getRuntime().exec(rootUser.getAbsolutePath());         } else {             return Runtime.getRuntime().exec("su");         }     }           static Process createSuProcess(String cmd) throws IOException {           DataOutputStream os = null;         Process process = createSuProcess();           try {             os = new DataOutputStream(process.getOutputStream());             os.writeBytes(cmd + "\n");             os.writeBytes("exit $?\n");         } finally {             if(os != null) {                 try {                     os.close();                 } catch (IOException e) {                 }             }         }           return process;     } }

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