我正在编写一个WearOS应用程序,试图通过振动来判断时间。(例如,如果时间是4:12,它将振动4次,然后是1次,然后是2次)我怀疑这是否有太多的实际用途,但我这样做是为了学习Android应用程序开发。
我试图使用handler.postDelayed来实现振动之间的延迟,但这只能工作一次。在成功触发一次handler后,我需要重新启动活动才能再次工作。为什么要这样做呢?
我的相关代码在这里。
int[] pulses = new int[4]; //length 4, one for each possible digit of the time
@Override
protected void onCreate(Bundle savedInstanceState) {
//some init code goes here
Calendar cal = Calendar.getInstance();
int hour = cal.get(Calendar.HOUR);
int minute = cal.get(Calendar.MINUTE);
pulses[0] = hour/10;
pulses[1] = hour%10;
pulses[2] = minute/10;
pulses[3] = minute%10;
RelativeLayout parent_layout = findViewById(R.id.parent_layout);
parent_layout.setOnTouchListener(new TotalGestureDetector(this){
@Override
public void onDoubleTap(MotionEvent e) {
Toast.makeText(getApplicationContext(), "Double-Tap", Toast.LENGTH_SHORT).show();
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
int time = vibratePattern();
if (time < 0){
return; //no need to re-call the function
}
new Handler().postDelayed(this, time);
return;
}
}, 500);
}
});
private int vibratePattern(){
int pulse_len = 130;
int pause_len = 100;
int delay_between_digits = 1250;
for(int i = 0; i < pulses.length; i++){
if (pulses[i] > 0){
pulses[i]--;
buzz(pulse_len);
return pulse_len + pause_len;
} else if( pulses[i] == 0){
//don't vibrate, insert delay between digits
pulses[i]--; //set this to -1 so we know it is acted upon
return delay_between_digits;
} else {
//Do nothing, let the loop continue to the next digit in the time.
}
}
//if it ever gets here, array is empty
//return -1 to show that no more calls are needed
return -1;
}
如果代码太多,我很抱歉。
嗡嗡声只是我的一个函数,它在给定的毫秒内振动设备
TotalGestureDetector是我刚从这里下载的一个类。https:/gist.github.comnesquenab2f023bb04190b2653c7。 并重新命名。
parent_layout实际上只是一个空活动中的默认布局--屏幕是空白的,我想让这个应用只振动。
你应该恢复值的 pulses
再当它已经振动所有。试试这个
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
int time = vibratePattern();
if (time < 0){
pulses[0] = hour/10;
pulses[1] = hour%10;
pulses[2] = minute/10;
pulses[3] = minute%10;
return; //no need to re-call the function
}
new Handler().postDelayed(this, time);
return;
}
}, 500);