Android通過應用來設定系統時間

原文位址

最近項目要求在App中添加設定時間的功能，谷歌百度一番，找到了一個可行方案，再此記錄，以便使用

注意：

本次測試在4.1， 4.2 原生均可用， 需root權限

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 - );
            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 /  < Integer.MAX_VALUE) {
                SystemClock.setCurrentTimeMillis(when);
            }

            long now = Calendar.getInstance().getTimeInMillis();
            //Log.d(TAG, "set tm="+when + ", now tm="+now);

            if (now - when > )
                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 /  < Integer.MAX_VALUE) {
                SystemClock.setCurrentTimeMillis(when);
            }

            long now = Calendar.getInstance().getTimeInMillis();
            //Log.d(TAG, "set tm="+when + ", now tm="+now);

            if (now - when > )
                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 /  < Integer.MAX_VALUE) {
                SystemClock.setCurrentTimeMillis(when);
            }

            long now = Calendar.getInstance().getTimeInMillis();
            //Log.d(TAG, "set tm="+when + ", now tm="+now);

            if (now - when > )
                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;
        }
    }