通知栏构建和取消的基本认识

思路图

 

MainActivity.class

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public class MainActivity extends AppCompatActivity implements View.OnClickListener{     NotificationManager manager;     int notification_ID = 0;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          findViewById(R.id.send_message).setOnClickListener(this);          findViewById(R.id.cancel_message).setOnClickListener(this);         manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);  //取得通知控制类         }       @Override     public void onClick(View v) {         switch (v.getId()){             case R.id.send_message:{                 send_message_method();                 break;             }             case R.id.cancel_message:{                 cancel_message_method();                 break;             }         }     }       //构建发送通知方法     private void cancel_message_method() {         manager.cancel(notification_ID);     }     //取消通知栏     private void send_message_method() {           Intent itent = new Intent(this,MainActivity.class);         PendingIntent pitent = PendingIntent.getActivity(this,0,itent,0);         //构建Notification的builder构建器         Notification.Builder builder = new Notification.Builder(this);         builder.setSmallIcon(R.mipmap.ic_launcher);     //设置图标         builder.setTicker("你好，世界！");   //设置手机状态栏提示信息         builder.setWhen(System.currentTimeMillis());    // 设置时间         builder.setContentTitle("世界游戏之标题");     //设置标题         builder.setContentText("鹅鹅鹅，曲项向天歌！");   //设置通知内容           builder.setContentIntent(pitent); //设置点击后的意图 //        builder.setDefaults(Notification.DEFAULT_LIGHTS);//设置提示指示灯 //        builder.setDefaults(Notification.DEFAULT_SOUND);//设置提示声音 //        builder.setDefaults(Notification.DEFAULT_VIBRATE);//设置提示震动         builder.setDefaults(Notification.DEFAULT_ALL);  //设置全部都有         Notification notification =  builder.build();//4.1以上         manager.notify(notification_ID,notification);       } }

　注意设置Defaults时候的权限。振动，声音权限。

<uses-permission android:name="ANDROID.PERMISSION.FLASHLIGHT" />
<uses-permission android:name="android.permission.VIBRATE"/>