Android 通过应用程序来设置系统的日期和时间中的

android 2.3
android 4.0
测试可行,刚需ROOT权限.
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;

	}

}