Android 使用AlarmManager和NotificationManager来实现闹钟和通知栏

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"  android:layout_width="match_parent" android:layout_height="match_parent"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  android:orientation="vertical"  tools:context="com.example.g150825_android28.MainActivity">  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="设置闹钟（一次）"    android:onClick="setAlarmOne"    />  <Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="设置闹钟（周期）"    android:onClick="setAlarm"    />  <Button    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="取消周期闹钟"    android:onClick="cancelAlarm"    />  <Button    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="发送通知"    android:onClick="send"    /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/activity_ring"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:paddingBottom="@dimen/activity_vertical_margin"  android:paddingLeft="@dimen/activity_horizontal_margin"  android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin"  tools:context="com.example.g150825_android28.RingActivity">  <Button    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="停止"    android:onClick="stop"    android:id="@+id/button"    android:layout_alignParentTop="true"    android:layout_alignParentLeft="true"    android:layout_alignParentStart="true" />  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="慈禧太后青霜来了，赶紧起床！"    android:id="@+id/textView"    android:textSize="30sp"    android:layout_below="@+id/button"    android:layout_centerHorizontal="true"    android:layout_marginTop="36dp" /></RelativeLayout>

package com.example.g150825_android28;import android.media.MediaPlayer;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;public class RingActivity extends AppCompatActivity {  private MediaPlayer mediaPlayer;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_ring);    mediaPlayer = MediaPlayer.create(this, R.raw.sqbm);    mediaPlayer.start();  }  public void stop(View view){    mediaPlayer.stop();    finish();  }}

package com.example.g150825_android28;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class MyReceiver extends BroadcastReceiver {  public MyReceiver() {  }  @Override  public void onReceive(Context context, Intent intent) {    if("com.example.g150825_android28.RING".equals(intent.getAction())){      Toast.makeText(context, "闹钟响了", Toast.LENGTH_SHORT).show();      //跳转到Activity      Intent intent1=new Intent(context,RingActivity.class);      //设置标志位(Flag)      intent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);      context.startActivity(intent1);    }  }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"  package="com.example.g150825_android28">  <application    android:allowBackup="true"    android:icon="@mipmap/ic_launcher"    android:label="@string/app_name"    android:supportsRtl="true"    android:theme="@style/AppTheme">    <activity android:name=".MainActivity">      <intent-filter>        <action android:name="android.intent.action.MAIN" />        <category android:name="android.intent.category.LAUNCHER" />      </intent-filter>    </activity>    <receiver      android:name=".MyReceiver"      android:enabled="true"      android:exported="true">      <intent-filter>        <action android:name="com.example.g150825_android28.RING" />      </intent-filter>    </receiver>    <activity android:name=".RingActivity"      android:theme="@style/Theme.AppCompat.Dialog"      ></activity>  </application></manifest>