利用BroadCastReceiver实现service与acvitity之间的通信（线程倒计时）

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public class MainActivity extends AppCompatActivity {    private TextView tv_number;    private Button btn_start;    private MyBroadReciver reciver=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //⑦程序创建时实例化自定义广播解析者        reciver=new MyBroadReciver();        tv_number= (TextView) findViewById(R.id.tv_number);        btn_start= (Button) findViewById(R.id.btn_start);        btn_start.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //①启动跳转到service                turnService();            }        });    }    //定义跳转到service的方法    private void turnService(){        Intent intent=new Intent(this,MyService.class);        startService(intent);    }    /**     * ⑥定义广播接收者，重写onReceive方法     */    class MyBroadReciver extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {            String mes=intent.getStringExtra("count");            tv_number.setText(mes);        }    }    /**     * ⑧开始接收广播时动态获取权限     */    @Override    protected void onStart() {        super.onStart();        IntentFilter filter=new IntentFilter();        filter.addAction("com.work.test310.MainAcvitity");        registerReceiver(reciver,filter);    }    /**     * ⑨结束广播时释放资源，解除绑定     */    @Override    protected void onStop() {        super.onStop();        unregisterReceiver(reciver);    }

public class MyService extends Service {    private MyThread thread=null;    public static int i=10;    public MyService() {    }    @Override    public IBinder onBind(Intent intent) {        // TODO: Return the communication channel to the service.        throw new UnsupportedOperationException("Not yet implemented");    }    /**     * ③重写onStartCommand方法     * @param intent     * @param flags     * @param startId     * @return     */    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        //⑤在service中实例化并开启线程        if(thread==null){            thread=new MyThread();            thread.start();        }        return super.onStartCommand(intent, flags, startId);    }    /**     * ④自定义线程类，设置倒计时的线程方法     */    class MyThread extends Thread{        @Override        public void run() {            while (i>=0){                Intent intent=new Intent("com.work.test310.MainAcvitity");                intent.putExtra("count",String.valueOf(i));                sendBroadcast(intent);                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();                }                i--;            }            super.run();        }    }

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