我想编写一个Android应用程序,在打开后20秒钟调用方法,然后每10秒自动调用方法。
有什么想法如何继续进行吗?
我想编写一个Android应用程序,在打开后20秒钟调用方法,然后每10秒自动调用方法。
有什么想法如何继续进行吗?
你可以使用单个 Handler
来完成它,类似这样:
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
//Do something after 20 seconds
}
}, 20000); //the time is in miliseconds
为了每隔10秒钟重复相同的操作,您可以在同一个方法中添加以下行:
并且在这个方法中重复相同的内容,您可以添加以下代码:
handler.postDelayed(this, 10000);
就像这样:
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
//Do something after 20 seconds
handler.postDelayed(this, 10000);
}
}, 20000); //the time is in miliseconds
new java.util.Timer().schedule(
new java.util.TimerTask() {
@Override
public void run() {
// your code here
}
},
5000
);
CountDownTimer cdt;
cdt = new CountDownTimer(timeint * 60 * 1000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
Log.i(TAG, millisUntilFinished " millis left");
}
@Override
public void onFinish() {
Log.i(TAG, "Timer finished");
}
};
cdt.start();
new Timer().scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
// Enter your code
}
}, 0, 20000);//put here time 1000 milliseconds=1 second
Handler myHandler = new Handler();
myHandler.postDelayed(new Runnable() {
@Override
public void run() {
//Do something after 20 seconds
//call the method which is schedule to call after 20 sec
}
}, 200000); //the time is in miliseconds
-再次重复10秒钟以上的操作,与上述步骤相同,并进行循环重复。
希望这对你有所帮助...谢谢
final Handler handler = new Handler();//class variable
int count = 0;
handler.post(new Runnable() {
@Override
public void run() {
updateCounter(count++);
if(count < (10*20000)) {
handler.postDelayed(this, 20000);
}
}
});
更新计数器的函数:
private void updateCounter(final int count) {
runOnUiThread(new Runnable() {
@Override
public void run() {
// you have the seconds passed
// do what ever you want
}
});
}
如果您想在应用程序不活动(关闭)时执行任务,可以使用闹钟管理器。
它会持续运行,直到您停止它。
以下是完整示例:
http://javatechig.com/android/repeat-alarm-example-in-android
private CountDownTimer countDownTimer;
private void startTimer(final Context context) {
if (countDownTimer != null) {
countDownTimer.cancel();
countDownTimer = null;
}
countDownTimer = new CountDownTimer(20 * 1000, 1 * 1000) {
public void onTick(long millisUntilFinished) {
//
}
public void onFinish() {
yourMethod();
startTimer(context);
}
}
}.start();
}
public class Main extends Activity {
private TextView txtStatus;
private RefreshHandler mRedrawHandler = new RefreshHandler();
class RefreshHandler extends Handler {
@Override
public void handleMessage(Message msg) {
Main.this.updateUI();
}
public void sleep(long delayMillis) {
this.removeMessages(0);
sendMessageDelayed(obtainMessage(0), delayMillis);
}
};
private void updateUI(){
int currentInt = Integer.parseInt((String) txtStatus.getText()) + 10;
if(currentInt <= 100){
mRedrawHandler.sleep(10000);
txtStatus.setText(String.valueOf(currentInt));
}
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
this.txtStatus = (TextView) this.findViewById(R.id.txtStatus);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
updateUI();
}
}, 20000);
}
}