Using Sensor : Sensor « Hardware « Android

1. Android
2. Hardware
3. Sensor

Using Sensor

   
package app.test;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;
import android.provider.Settings;

public class Test extends Activity implements SensorEventListener {
    private WakeLock mWakelock;
    private PowerManager mPwrMgr;
    private WakeLock mTurnBackOn = null;
    Handler handler = new Handler();
  private SensorManager mMgr;
    private Sensor mAccel;
    private BufferedWriter mLog;
  final private SimpleDateFormat mTimeFormat = new SimpleDateFormat("HH:mm:ss - ");
  private int mSavedTimeout;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mMgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);
        mAccel = mMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        try {
            String filename = Environment.getExternalStorageDirectory().getAbsolutePath() +
            "/accel.log";
            mLog = new BufferedWriter(new FileWriter(filename, true));
        }
        catch(Exception e) {
          e.printStackTrace();
          finish();
        }
        mPwrMgr = (PowerManager) this.getSystemService(POWER_SERVICE);
        mWakelock = mPwrMgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Accel");
        mWakelock.acquire();
        try {
          mSavedTimeout = Settings.System.getInt(getContentResolver(), 
              Settings.System.SCREEN_OFF_TIMEOUT);
        }
        catch(Exception e) {
          mSavedTimeout = 120000;  // 2 minutes
        }
        Settings.System.putInt(getContentResolver(), 
            Settings.System.SCREEN_OFF_TIMEOUT, -1);  // always on
    }

    public BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            if (Intent.ACTION_SCREEN_OFF.equals(intent.getAction())) {
                handler.post(new Runnable() {
          public void run() {
            if(mTurnBackOn != null)
              mTurnBackOn.release();
                    mTurnBackOn = mPwrMgr.newWakeLock(
                            PowerManager.SCREEN_DIM_WAKE_LOCK |
                                    PowerManager.ACQUIRE_CAUSES_WAKEUP,
                            "AccelOn");
                    mTurnBackOn.acquire();
          }});
            }
        }
    };

    @Override
    protected void onStart() {
        mMgr.registerListener(this, mAccel, SensorManager.SENSOR_DELAY_NORMAL);
        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
        registerReceiver(mReceiver, filter);
      super.onStart();
    }

    @Override
    protected void onStop() {
        mMgr.unregisterListener(this, mAccel);
        unregisterReceiver(mReceiver);
        try {
      mLog.flush();
    } catch (IOException e) {
    }
      super.onStop();
    }

    @Override
    protected void onDestroy() {
      try {
          mLog.flush();
          mLog.close();
      }
      catch(Exception e) {
      }
        Settings.System.putInt(getContentResolver(), Settings.System.SCREEN_OFF_TIMEOUT, mSavedTimeout);
        mWakelock.release();
        if(mTurnBackOn != null)
            mTurnBackOn.release();
        super.onDestroy();
    }
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
  }
  public void onSensorChanged(SensorEvent event) {
    writeLog("Got a sensor event: " + event.values[0] + ", " +
        event.values[1] + ", " + event.values[2]);
  }
  private void writeLog(String str) {
    try {
        Date now = new Date();
        mLog.write(mTimeFormat.format(now));
      mLog.write(str);
      mLog.write("\n");
    }
    catch(IOException ioe) {
      ioe.printStackTrace();
    }
  }
}

   
    
    
  

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