android设置系统时间

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;

}

}