Android 延迟循环从陀螺仪收集数据

Question

我一直在创建这个 android 应用程序，并且在此过程中学到了很多关于 java 和 android 编程的知识。但是，我只是无法弄清楚如何工作时间延迟循环。我查看了其他堆栈帖子并看到了不同的方法，但未能成功实现它们。我将描述我希望循环做什么。

当我触摸 Android 应用程序的屏幕时，我希望应用程序说话（“开始测试”）。在接下来的 20 秒内，我希望应用程序每 50 毫秒调用一次 angmag，以便我可以获得角速度的大小并查看它是否高于某个阈值。此函数每 50 毫秒调用一次，持续 20 秒，直到应用程序说出“测试完成”，然后完成测试。我将如何在 android 应用程序中实现此延迟功能？我已经评论了我想要延迟代码的地方。

package com.example.shivamgandhi.gyrosafe;

import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class Balance_Test_Activity extends VoiceControl implements View.OnClickListener, SensorEventListener, View.OnTouchListener {

    int n = 2;
    Button btnarray[] = new Button[n];
    private SensorManager sManager;
    private TextView textView79;
    RelativeLayout RelativeLayout;
    int count = 0;
    double arg0, arg1, arg2;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.balance_test);

        RelativeLayout = (RelativeLayout)findViewById(R.id.RelativeLayout4);

        btnarray[0] = (Button)findViewById(R.id.button10);
        btnarray[1] = (Button)findViewById(R.id.button20);

        sManager = (SensorManager) getSystemService(SENSOR_SERVICE);

        textView79 = (TextView)findViewById(R.id.textView79);

        for(int i = 0; i <n; i++){
            btnarray[i].setOnClickListener(this);
        }

        RelativeLayout.setOnTouchListener(this);

    }

    //when this Activity starts
    @Override
    protected void onResume()
    {
        super.onResume();
        /*register the sensor listener to listen to the gyroscope sensor, use the
        callbacks defined in this class, and gather the sensor information as quick
        as possible*/
        sManager.registerListener(this, sManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_FASTEST);
    }

    @Override
    protected void onStop()
    {
        //unregister the sensor listener
        sManager.unregisterListener(this);
        super.onStop();
    }

    @Override
    public void onClick(View v){
        if(v == findViewById(R.id.button10)){
            Intent myIntent = new Intent(this, Results_Page_Activity.class);
            startActivity(myIntent);
        }

        if(v == findViewById(R.id.button20)){
            //implement
            int gyro_results = gyrotest();
        }
    }

    @Override
    public boolean onTouch(View v, MotionEvent event){
        if(v == RelativeLayout && count ==0 ){
            gyrotest();
            count = 1;
            return true;
        }
        else{
            return false;
        }
    }

    public int gyrotest(){

        int gyro_results = 0;

        speakWords("Please place your hands on your hips and keep your feet under your shoulders. Hold your balance for the next 20 seconds");

        Thread.sleep(5000); //delay 5 seconds;
        int count = 0;
        int angmag = 0;
        while(count < 401){
            if (Math.sqrt((arg0*arg0 + arg1*arg1 + arg2*arg2)) > 20){
                 angmag = 1;
            }
            else{
                angmag = 0;
            }

            gyro_results = angmag + gyro_results;
            count++;
            Thread.sleep(50000);
        }

        return gyro_results;
    }

    @Override
    public void onAccuracyChanged(Sensor arg0, int arg1)
    {
        //Do nothing.
    }


    public void onSensorChanged(SensorEvent event)
    {
        //if sensor is unreliable, return void
        if (event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE)
        {
            return;
        }

        arg0 = event.values[0];
        arg1 = event.values[1];
        arg2 = event.values[2];

        //else it will output the Roll, Pitch and Yawn values
        textView79.setText("Orientation X (Roll) :"+ Float.toString(event.values[2]) +"\n"+
                "Orientation Y (Pitch) :"+ Float.toString(event.values[1]) +"\n"+
                "Orientation Z (Yaw) :"+ Float.toString(event.values[0]));
    }
}

我假设代码应该是这样的：

delay 5 seconds;
int count = 0;
while count < 401{
    gyro_results = angmag + gyro_results;
    count++;
    delay 50 milliseconds;
}

return gyro_results;

我希望自己能够弄清楚如何编写代码，但我已经尝试了大多数方法。提前感谢您的帮助:)

编辑：在修改后的代码中添加了 Thread.sleep 函数。但是，我仍然发现 Thread.sleep 存在一些问题。

Answer 1

在线程中使用 sleep() 方法进行延迟处理。

try
{
Thread.sleep(5000);    //delay 5 seconds;
int count = 0;
while count < 401{
gyro_results = angmag + gyro_results;
count++;
Thread.sleep(50000);    //delay 50 milliseconds
}
}catch(InterruptedException ie)
{
//Log message if required.
}