Android 定时器的三种实现方法_在android平台上,你可以使用handler或timer类来创建一个定时器,然后在定时器触发

Android 定时器的三种实现方法

第一种:采用Handler与线程的sleep(long)方法

“`JAVA
public class MainActivity extends Activity {
Handler handler;
private TextView tv;
int i = 0;

public boolean isstop = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv = (TextView) findViewById(R.id.tv);

    // 定时器的三种实现方法
    // -----------------------------------------------------------------------------
    // 第一种:采用Handler与线程的sleep(long)方法

    handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            tv.setText(i++ + "");

            // 开启定时器线程
            new Thread(new MyThread()).start();

        };

    };

}

public void start(View view) {
    isstop = false;
    // 开启定时器线程
    new Thread(new MyThread()).start();

}

// 停止
public void stop(View view) {
    isstop = true;

}

class MyThread implements Runnable {

    @Override
    public void run() {
        if (!isstop) {

            // TODO Auto-generated method stub
            try {
                Thread.sleep(1 * 1000);
                Message msg = new Message();
                msg.what = 1;
                handler.sendMessage(msg);

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }

}
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}

“

第二种:采用Handler的postDelayed(Runnable, long)方法

“`java

public class MainActivity extends Activity {
Handler handler;
private TextView tv;
int i = 0;
Runnable runnable;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tv = (TextView) findViewById(R.id.tv);

    handler = new Handler();
    runnable = new Runnable() {
        @Override
        public void run() {
            // TODO Auto-generated method stub
            // 要做的事情
            tv.setText(i++ + "");
            handler.postDelayed(runnable, 2 * 1000);
        }
    };

}

public void start(View view) {
    // 开启定时器线程
    handler.postDelayed(runnable, 2 * 1000);//两秒后执行一次runnable的 run() 方法.

}

// 停止
public void stop(View view) {
    handler.removeCallbacks(runnable);
}
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}