MyService.class
public class MyService extends Service { public MyService() { } // 创建一个服务 @Override public void onCreate() { super.onCreate(); } // 服务启动 @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.i("MyServer", "服务启动了"); Timer timer = new Timer(); int n = 5 * 60 * 10000; timer.scheduleAtFixedRate(new TimerTask() { @Override public void run() { new Thread(new Runnable() { @Override public void run() { Looper.prepare(); // TODO: 2019/11/7 AlertDialog.Builder builder=new AlertDialog.Builder(MyApp.getContext()); builder.setTitle("提示"); builder.setMessage("已经过去五分钟了n且行器珍惜"); builder.setNegativeButton("明白了",null); Dialog dialog=builder.create(); dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); dialog.show(); Looper.loop(); } }).start(); Log.i("MyServer","五分钟了"); } }, 10000, n); return super.onStartCommand(intent, flags, startId); } // 服务销毁 @Override public void onDestroy() { stopSelf(); super.onDestroy(); } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. return new MyBinder(); } class MyBinder extends Binder { /** * 获取Service的方法 * @return 返回PlayerService */ public MyService getService() { return MyService.this; } } }
注意 Looper.prepare()和 Looper.loop()这两行,少了它们会报Can‘t create handler inside thread that has not called Looper.prepare()这个错误
在AndroidManifest中
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/><!--这行代码必须存在,否则点击不了系统设置中的按钮--> <uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW" />
不过服务一般在创建的时候它就会自己帮我们添加了
<service android:name=".MyService" android:enabled="true" android:exported="true"></service>
在Activity中绑定服务
public class MainActivity extends AppCompatActivity { public Intent intent; ServiceConnection serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { // 建立连接 // 获取服务操作对象 MyService.MyBinder binder = (MyService.MyBinder) service; binder.getService();//获取到Service } @Override public void onServiceDisconnected(ComponentName name) { } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); intent = new Intent(this, MyService.class); startService(intent);//启动服务 } @Override protected void onDestroy() { super.onDestroy(); // stopService(intent); // 程序销毁时,退出服务 } }