<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><Button android:id="@+id/btn" android:text="设置闹钟"android:layout_width="fill_parent"android:layout_height="wrap_content" /> </LinearLayout>

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.ljq.activity" android:versionCode="1"android:versionName="1.0"><application android:icon="@drawable/icon"android:label="@string/app_name"><activity android:name=".MainActivity"android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><categoryandroid:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activity android:name=".AlarmActivity" /><!-- android:process=":remote": 新开一个进程 --><receiver android:name=".AlarmReceiver" android:process=":remote"/></application><uses-sdk android:minSdkVersion="7" /> </manifest>

package com.ljq.activity;import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent;public class AlarmReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {Intent i=new Intent(context, AlarmActivity.class);i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(i);} }

package com.ljq.activity;import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.DialogInterface.OnClickListener; import android.os.Bundle;public class AlarmActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//显示对话框 new AlertDialog.Builder(AlarmActivity.this).setTitle("闹钟").//设置标题 setMessage("时间到了！").//设置内容 setPositiveButton("知道了", new OnClickListener(){//设置按钮 public void onClick(DialogInterface dialog, int which) {AlarmActivity.this.finish();//关闭Activity }}).create().show();}}

package com.ljq.activity;import java.util.Calendar;import android.app.Activity; import android.app.AlarmManager; import android.app.Dialog; import android.app.PendingIntent; import android.app.TimePickerDialog; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TimePicker; import android.widget.Toast;public class MainActivity extends Activity{private Button btn=null;private AlarmManager alarmManager=null;Calendar cal=Calendar.getInstance();final int DIALOG_TIME = 0; //设置对话框id @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);alarmManager=(AlarmManager)getSystemService(Context.ALARM_SERVICE);btn=(Button)findViewById(R.id.btn);btn.setOnClickListener(new View.OnClickListener(){public void onClick(View view) {showDialog(DIALOG_TIME);//显示时间选择对话框 }});}@Overrideprotected Dialog onCreateDialog(int id) {Dialog dialog=null;switch (id) {case DIALOG_TIME:dialog=new TimePickerDialog(this, new TimePickerDialog.OnTimeSetListener(){public void onTimeSet(TimePicker timePicker, int hourOfDay,int minute) {Calendar c=Calendar.getInstance();//获取日期对象 c.setTimeInMillis(System.currentTimeMillis()); //设置Calendar对象 c.set(Calendar.HOUR, hourOfDay); //设置闹钟小时数 c.set(Calendar.MINUTE, minute); //设置闹钟的分钟数 c.set(Calendar.SECOND, 0); //设置闹钟的秒数 c.set(Calendar.MILLISECOND, 0); //设置闹钟的毫秒数 Intent intent = new Intent(MainActivity.this, AlarmReceiver.class); //创建Intent对象 PendingIntent pi = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0); //创建PendingIntent//alarmManager.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), pi); //设置闹钟 alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), pi); //设置闹钟，当前时间就唤醒 Toast.makeText(MainActivity.this, "闹钟设置成功", Toast.LENGTH_LONG).show();//提示用户 }}, cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE),false);break;}return dialog;} }