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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