[Android] 定时器的实现（一）

最新推荐文章于 2025-05-28 17:59:14 发布

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本文介绍了三种在Android中实现定时任务的方法：使用Handler配合Thread的sleep方法、利用Handler的postDelayed方法以及结合Handler、Timer与TimerTask的方式。每种方法都提供了具体的代码示例，并说明了如何取消对应的定时任务。

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1, Handler 加 Thread 的 sleep 方法

public class MainActivity extends Activity {

    private Button mButton;
    private MyThread myThread = new MyThread();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mButton = (Button) findViewById(R.id.main_view_button);

        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                myThread.cancel();
            }
        });

        new Thread(myThread).start();
    }

    Handler handler = new Handler() {
        public void handleMessage(Message msg) {
            if (myThread.isCancel())
                return;

            super.handleMessage(msg);
        }
    };

    public class MyThread implements Runnable {

        private boolean bCancel = false;

        @Override
        public void run() {
            while (true) {
                try {
                    if (! isCancel()) {
                        // 线程暂停10s
                        Thread.sleep(10 * 1000);
                        Message message = Message.obtain();
                        message.what = 0x001;
                        handler.sendMessage(message);
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

        public boolean isCancel() {
            return bCancel;
        }

        public void cancel() {
            this.bCancel = true;
        }
    }
}

2, Handler的postDelayed(Runnable, long)方法

public class MainActivity extends Activity {

    Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        handler.postDelayed(runnable, 10 * 1000);
    }

    Runnable runnable = new Runnable() {

        @Override
        public void run() {
            Log.v(TAG, "do some thing");
            handler.postDelayed(this , 10 * 1000);
        }
    };
}

停止计时器

handler.removeCallbacks(runnable);

3. Handler + Timer + TimerTask

public class MainActivity extends Activity {

    private final Timer timer = new Timer();
    private TimerTask task = new TimerTask() {

        @Override
        public void run() {
            Message message = Message.obtain();
            message.what = 0x001;
            handler.sendMessage(message);
        }
    };

    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            Log.v(TAG,"handleMessage");
            super.handleMessage(msg);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        timer.schedule(task, 10000, 10000);
    }
}

取消的方法：

timer.cancel()