简单实现Android闹钟程序 附源码

package com.example.clock;import java.util.Calendar;import android.app.Activity;import android.app.AlertDialog;import android.app.TimePickerDialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.TimePicker;public class ClockDemo extends Activity { private Button mSet; Calendar mCalendar = Calendar.getInstance(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ObjectPool.mAlarmHelper = new AlarmHelper(this); mSet = (Button) findViewById(R.id.mSet); setListener(); } public void setListener() { mSet.setOnClickListener(new View.OnClickListener() {  public void onClick(View v) {  mCalendar.setTimeInMillis(System.currentTimeMillis());  int mHour = mCalendar.get(Calendar.HOUR_OF_DAY);  int mMinute = mCalendar.get(Calendar.MINUTE);  new TimePickerDialog(ClockDemo.this,   new TimePickerDialog.OnTimeSetListener() {    public void onTimeSet(TimePicker view,     int hourOfDay, int minute) {    mCalendar.setTimeInMillis(System     .currentTimeMillis());    mCalendar.set(Calendar.HOUR_OF_DAY, hourOfDay);    mCalendar.set(Calendar.MINUTE, minute);    mCalendar.set(Calendar.SECOND, 0);    mCalendar.set(Calendar.MILLISECOND, 0);    ObjectPool.mAlarmHelper.openAlarm(32, "ddd",     "ffff", mCalendar.getTimeInMillis());    }   }, mHour, mMinute, true).show();  } }); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) {  showBackDialog();  return true; } return super.onKeyDown(keyCode, event); } /** Give the tip when exit the application. */ public void showBackDialog() { final AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle("提示")  .setIcon(R.drawable.icon)  .setMessage("是否退出?")  .setPositiveButton("sure",   new DialogInterface.OnClickListener() {    public void onClick(DialogInterface dialog,     int which) {    System.exit(0);    android.os.Process     .killProcess(android.os.Process.myPid());    dialog.dismiss();    }   })  .setNegativeButton("cancel",   new DialogInterface.OnClickListener() {    public void onClick(DialogInterface dialog,     int which) {    dialog.dismiss();    }   }); AlertDialog ad = builder.create(); ad.show(); }}

package com.example.clock;import android.app.AlarmManager;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;public class AlarmHelper { private Context c; private AlarmManager mAlarmManager; public AlarmHelper(Context c) { this.c = c; mAlarmManager = (AlarmManager) c  .getSystemService(Context.ALARM_SERVICE); } public void openAlarm(int id, String title, String content, long time) { Intent intent = new Intent(); intent.putExtra("_id", id); intent.putExtra("title", title); intent.putExtra("content", content); intent.setClass(c, CallAlarm.class); PendingIntent pi = PendingIntent.getBroadcast(c, id, intent,  PendingIntent.FLAG_UPDATE_CURRENT); mAlarmManager.set(AlarmManager.RTC_WAKEUP, time, pi); } public void closeAlarm(int id, String title, String content) { Intent intent = new Intent(); intent.putExtra("_id", id); intent.putExtra("title", title); intent.putExtra("content", content); intent.setClass(c, CallAlarm.class); PendingIntent pi = PendingIntent.getBroadcast(c, id, intent, 0); mAlarmManager.cancel(pi); }}

package com.example.clock;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class CallAlarm extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { intent.setClass(context, AlarmAlert.class); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(intent); }}

package com.example.clock;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;public class AlarmAlert extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new AlertDialog.Builder(AlarmAlert.this)  .setIcon(R.drawable.clock)  .setTitle("ddd")  .setMessage("fff")  .setPositiveButton("ddd",   new DialogInterface.OnClickListener() {    public void onClick(DialogInterface dialog,     int whichButton) {    System.exit(0);    android.os.Process     .killProcess(android.os.Process.myPid());    }   }).show(); }}ObjectPool.javapublic class ObjectPool { /** The alarm object. */ public static AlarmHelper mAlarmHelper;}