Android中的計步器（計數器傳感器不起作用）

Question

我嘗試在android中制作一個基本的計步器應用程序。 但是當我遇到錯誤時

計數器傳感器不可用

請幫我。

package com.starboardland.pedometer;

import android.app.Activity;
import android.content.Context;
import android.hardware.*;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class CounterActivity extends Activity implements SensorEventListener {

    private SensorManager sensorManager;
    private TextView count;
    boolean activityRunning;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        count = (TextView) findViewById(R.id.count);

        sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    }

    @Override
    protected void onResume() {
        super.onResume();
        activityRunning = true;
        Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
        if (countSensor != null) {
            sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI);
        } else {
            Toast.makeText(this, "Count sensor not available!", Toast.LENGTH_LONG).show();
        }

    }

    @Override
    protected void onPause() {
        super.onPause();
        activityRunning = false;
        // if you unregister the last listener, the hardware will stop detecting step events
//        sensorManager.unregisterListener(this); 
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (activityRunning) {
            count.setText(String.valueOf(event.values[0]));
        }

    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
}

Answer 1

Android 4.4 API文檔指出傳感器取決於硬件。

兩個步進傳感器均取決於硬件（Nexus 5是第一個支持它們的設備），因此您應使用FEATURE_SENSOR_STEP_DETECTOR和FEATURE_SENSOR_STEP_COUNTER常量檢查hasSystemFeature（）的可用性。

您應該首先檢查設備是否具有該功能。

PackageManager pm = getPackageManager();
if (pm.hasSystemFeature(PackageManager.FEATURE_SENSOR_STEP_COUNTER)) {
    // the awesome stuff here
}