java - 如何在所有 Android 设备上完美检测震动级别？

Question

我想在通过加速度计检测到震动时执行特定任务，但问题是每个设备的灵敏度级别都不同。例如:在传感器上查看此代码已更改`

public void onSensorChanged(SensorEvent event) {

    float[] values = event.values;
    // Movement
    float x = values[0];
    float y = values[1];
    float z = values[2];
    //formula
    float accelationSquareRoot = ((x * x + y * y + z * z)
            / (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH));
    float acc = accelationSquareRoot - 1;
    String s1 = String.valueOf(acc);
    //if I used a value 10 instead of 7 below it will be fine for samsung 
    phones but will not work on most nokia phones
    if (acc >= 7){//perform certain task} }

对于我的诺基亚 6.1，震动检测为最小值 1 到最大值 10，如果该值高于 10，则不会检测到任何内容；对于三星 Galaxy Note7，检测级别为最小值 1 到最大值 30，这意味着每个制造商的硬件都与其他制造商有所不同。如果我将值设置为 7，我必须在诺基亚 6.1 上用力摇晃，但在三星手机上，值 7 被认为是非常低的灵敏度，即使触摸手机，代码也会运行。我希望用户拥有各种 Android 设备来设置他们想要的灵敏度级别，如小、中、硬。我应该怎样做才能在近 1300 个品牌、超过 24,000 种不同 Android 设备的设备上运行此程序？

Answer 1

请尝试这种方式，

import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.Toast;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
   private SensorManager mSensorManager;
   private float mAccel;
   private float mAccelCurrent;
   private float mAccelLast;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
      Objects.requireNonNull(mSensorManager).registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
      SensorManager.SENSOR_DELAY_NORMAL);
      mAccel = 10f;
      mAccelCurrent = SensorManager.GRAVITY_EARTH;
      mAccelLast = SensorManager.GRAVITY_EARTH;
   }
   private final SensorEventListener mSensorListener = new SensorEventListener() {
      @Override
      public void onSensorChanged(SensorEvent event) {
         float x = event.values[0];
         float y = event.values[1];
         float z = event.values[2];
         mAccelLast = mAccelCurrent;
         mAccelCurrent = (float) Math.sqrt((double) (x * x + y * y + z * z));
         float delta = mAccelCurrent - mAccelLast;
         mAccel = mAccel * 0.9f + delta;
         if (mAccel > 12) {
            Toast.makeText(getApplicationContext(), "Shake event detected", Toast.LENGTH_SHORT).show();
         }
      }
      @Override
      public void onAccuracyChanged(Sensor sensor, int accuracy) {
      }
   };
   @Override
   protected void onResume() {
      mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
      SensorManager.SENSOR_DELAY_NORMAL);
      super.onResume();
   }
   @Override
   protected void onPause() {
      mSensorManager.unregisterListener(mSensorListener);
      super.onPause();
   }
}